Skocz do pozycji: 1.

Tytuł:

Store-operated calcium entry in physiology and pathology of mammalian cells

Autorzy:

Targos, Berenika
Barań0ska, Jolanta
Pomorski, Paweł

Powiązania:

https://bibliotekanauki.pl/articles/1041419.pdf

Data publikacji:

2005

Wydawca:

Polskie Towarzystwo Biochemiczne

Tematy:

store-operated calcium entry
store-operated channels
calcium stores
calcium signaling

Opis:

One of the numerous calcium-involving processes in mammalian cells is store-operated calcium entry (SOCE) - the process in which depletion of calcium stores in the endoplasmic reticulum (ER) induces calcium influx from the extracellular space. Previously supposed to function only in non-excitable cells, SOCE is now known to play a role also in such excitable cells as neurons, muscles and neuroendocrine cells and is found in many different cell types. SOCE participates not only in processes dependent on ER calcium level but also specifically regulates some important processes such as cAMP production, T lymphocyte activation or induction of long-term potentiation. Impairment of SOCE can be an element of numerous disorders such as acute pancreatitis, primary immunodeficiency and, since it can take part in apoptosis or cell cycle regulation, SOCE may also be partially responsible for such serious disorders as Alzheimer disease and many types of cancer. Even disturbances in the 'servant' role of maintaining ER calcium level may cause serious effects because they can lead to ER homeostasis disturbance, influencing gene expression, protein synthesis and processing, and the cell cycle.

Źródło:

Acta Biochimica Polonica; 2005, 52, 2; 397-409
0001-527X

Pojawia się w:

Acta Biochimica Polonica

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:

Effect of Water Treatment and Immersion in Calcium Salt Solutions on the Quality of Fruits of Peumo Pink Tomato (Solanum lycopersicum L.) Stored under Cold Conditions

Autorzy:

Correa, Julio
Amoros, Asuncion
Silva, Herman P.
Covarrubias, José I.
Escalona, Victor H.

Powiązania:

https://bibliotekanauki.pl/articles/2051046.pdf

Data publikacji:

2022-06-09

Wydawca:

Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie

Tematy:

calcium chloride
calcium lactate
calcium propionate
postharvest
heat treatment
heat shock protein

Opis:

Tomato is one of the most consumed vegetable crops worldwide. In the break stage, it is perishable, and it has a postharvest life that does not exceed three weeks at 12 to 15°C. The aim of this study was to evaluate the effect of immersion in water and in calcium salt solutions on the metabolism and quality of tomato of traditional Peumo Pink cultivar stored for 28 days at 10ºC plus a simulated trading period of 2 days at 20ºC. Fruits were treated in water at 5, 45 and 60ºC at two immersion times of 1 and 4 min or in 2% solutions of calcium chloride, lactate and propionate at 10 and 45ºC for 4 min. The respiration rate, ethylene production and heat shock protein gene expression as well as firmness, total phenolic content and antioxidant capacity of tomato were determined. Dipping in water at 60°C reduced the loss of firmness and respiratory rate of tomatoes up to 21 days at 10°C + 2 days at 20°C. Treatment in water at 45°C for 4 min and at 60°C for 1 or 4 min stimulated heat shock protein gene expression. However, fruit treated at 60°C for 1 or 4 min showed uneven ripening; hence, the immersion in water at 45°C for 4 min was the most recommended to extend the postharvest life of tomatoes. In turn, the immersion in calcium lactate and propionate solutions at 45°C increased total calcium content and maintained firmness after 28 days at 10°C + 2 days at 20°C. The use of high temperature and calcium salts for dipping would be beneficial to provide the vegetal tissues with calcium and reduce the softening of the tomato after prolonged cold storage.

Źródło:

Polish Journal of Food and Nutrition Sciences; 2022, 72, 2; 193-202
1230-0322
2083-6007

Pojawia się w:

Polish Journal of Food and Nutrition Sciences

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:

Postharvest calcium salt treatment of fresh jujube fruit and its effects on biochemical characteristics and quality after cold storage

Autorzy:

Moradinezhad, F.
Ghesmati, M.
Khayyat, M.

Powiązania:

https://bibliotekanauki.pl/articles/2161.pdf

Data publikacji:

2019

Wydawca:

Instytut Ogrodnictwa

Tematy:

jujube fruit
Ziziphus jujuba
cold storage
calcium chloride
calcium nitrate
calcium sulphate
antioxidant
biochemical characteristics

Źródło:

Journal of Horticultural Research; 2019, 27, 2
2300-5009

Pojawia się w:

Journal of Horticultural Research

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:

The network of calcium regulation in muscle.

Autorzy:

Martonosi, Anthony
Pikula, Slawomir

Powiązania:

https://bibliotekanauki.pl/articles/1043643.pdf

Data publikacji:

2003

Wydawca:

Polskie Towarzystwo Biochemiczne

Tematy:

sodium:calcium exchanger
calcium pump
calcium homeostasis
calcium channel
skeletal and cardiac muscles
mitochondria
sarcoplasmic reticulum
excitation-contraction coupling

Opis:

In this review the molecular characteristics and reaction mechanisms of different Ca2+ transport systems associated with various membranes in muscle cells will be summarized. The following topics will be discussed in detail: a brief history of early observations concerning maintenance and regulation of cellular Ca2+ homeostasis, characterization of the Ca2+ pumps residing in plasma membranes and sarco(endo)plasmic reticulum, mitochondrial Ca2+ transport, Ca2+-binding proteins, coordinated expression of Ca2+ transport systems, a general background of muscle excitation-contraction coupling with emphasis to the calcium release channels of plasma membrane and sarcoplasmic reticulum, the structure and function of dihydropyridine and ryanodine receptors of skeletal and cardiac muscles, and finally their disposition in various types of muscles.

Źródło:

Acta Biochimica Polonica; 2003, 50, 1; 1-30
0001-527X

Pojawia się w:

Acta Biochimica Polonica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 5.

Tytuł:

Characterization of the novel calcium phosphate/sulfate based bone cements

Autorzy:

Czechowska, J.
Paszkiewicz, Z.
Ślósarczyk, A.

Powiązania:

https://bibliotekanauki.pl/articles/286028.pdf

Data publikacji:

2012

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

biomaterial
calcium phosphate
calcium sulfate
dicalcium phosphate anhydrous

Opis:

Calcium phosphate cements (CPCs) are a family of self-setting, bone repair materials. CPCs possess excellent biocompatibility, surgical handiness and adequate mechanical properties but reveal slow resorption in vivo. Currently, very interesting group of CPCs are biomaterials composed of a-tricalcium phosphate (a-TCP, a-Ca3(PO4)2) and calcium sulfate. Calcium sulfate hemihydrate (CSH, CaSO40.5 H2O) posses a long clinical history in different fields of medicine and is widely recognized as a safe, fast setting and resorbable implant material. The main goal of this study was to investigate how different factors influence the phase composition and physico-chemical properties of the new, cement-type material on the basis of a-TCP, CSH and anhydrous dicalcium phosphate (DCP, CaHPO4). In presented work two different powder phase compositions and three liquid phases were used to produce new bone substitutes. XRD results showed that obtained materials, after setting and hardening, consisted of α-TCP, DCP, DCPD (CaHPO42H2O), HA and bassanite phases. Initial (I) and final (F) setting times of the cement pastes were determined with Gillmore needles and differed in the range of 4-14 min (I) and 10-30 min (F). Increase in the amount of CSH in the powder component resulted in shortening of setting time. Microstructure of cements was evaluated on the fractured samples by scanning electron microscopy (SEM) and the porosity via mercury porosimetry. Open porosity of the final materials was similar for all investigated compositions. Compressive strength depended on the composition and increased steadily over a period of maturation. The results obtained suggest that calcium phosphate/sulfate bone cement has the potential to be applied for bone augmentation.

Źródło:

Engineering of Biomaterials; 2012, 15, 115; 2-6
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:

The role and position of iron in 0.8CaZrO3-0.2CaFe2O4

Autorzy:

Szczerba, J.
Śnieżek, E.
Stoch, P.
Prorok, R.
Jastrzębska, I.

Powiązania:

https://bibliotekanauki.pl/articles/146129.pdf

Data publikacji:

2015

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

calcium ferrite
calcium zirconate
Mössbauer spectroscopy
perovskite
spinel

Opis:

The aim of the study was to characterize the 0.8CaZrO3-0.2CaFe2O4 composite structure with particular emphasis on the role and position of iron in the function of sintering temperature. The paper presents the results of 57Fe Mössbauer effect at room temperature. It was found that the increase of sintering temperature causes an increase in the amount of incorporated iron ions in the CaZrO3-crystal structure. Based on Mössbauer spectroscopy analysis, it was found that three different environments of Fe3+ ions were observed in the obtained materials. Two of them corresponded to CaFe2O4 phase and one was associated with the substitution of Zr4+ by Fe3+ in the CaZrO3 structure.

Źródło:

Nukleonika; 2015, 60, 1; 147-150
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:

Biodegradable cement type bone implant materials based on calcium phosphates and calcium sulphate

Autorzy:

Siek, D.
Czechowska, J.
Zima, A.
Ślósarczyk, A.

Powiązania:

https://bibliotekanauki.pl/articles/283901.pdf

Data publikacji:

2015

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

calcium phosphate cements
hydroxyapatite
calcium sulphate
α-tricalcium phosphate
biomaterials

Opis:

Calcium phosphates (CaPs) are widely used in hard tissue replacement because of their excellent biocompatibility. Calcium phosphate cements (CPCs) are an interesting alternative for sintered calcium phosphate ceramics due to their mouldability and self-setting properties which allow them to conform to even the most complex bone defects. However, one of the major limitations of CPCs is their relatively low resorption rate, not optimal for bone regeneration. The aim of our studies was to combine a stable hydroxyapatite with more soluble α-tricalcium phosphate (α-TCP) or calcium sulphate (CS) (resorbability: CS>>α-TCP>HA) to develop biomaterial with gradual degradation. Promising materials for use in minimally invasive surgery for bone defects repair were obtained. It was found that the degradation rate of hydroxyapatite based bone substitutes can be controlled by the addition of an appropriate kind and amount of more soluble constituent. The impact of the setting component (α-TCP or CS) on the physicochemical properties of the final products was confirmed. Furthermore the influence of organic additives (chitosan, methylcellulose, alginate) on the final materials characteristic was proven. Solutions of organic additives, applied as the liquid phases, significantly improved the workability of cement pastes. It has been demonstrated that implant materials based on calcium sulphate and α-TCP differed in their setting times, mechanical strength, dissolution rate and morphologies of apatite layers on their surfaces after soaking in simulated body fluid. The reason of observed differences is a higher susceptibility of calcium sulphate to both disintegration and degradation.

Źródło:

Engineering of Biomaterials; 2015, 18, 133; 2-6
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:

Calcium ions in the pig pineal gland - an ultracytochemical study
Jony wapniowe w szyszynce swini - badania ultracytochemiczne

Autorzy:

Lewczuk, B
Bulc, M.
Prusik, M.
Przybylska-Gornowicz, B.

Powiązania:

https://bibliotekanauki.pl/articles/14383.pdf

Data publikacji:

2007

Wydawca:

Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza

Tematy:

pig
pineal gland
calcium ion
ultracytochemical analysis
calcium ion distribution

Opis:

The aim of the study was to analyze the distribution of calcium ions in the pig pineal gland at the level of electron microscopy. The investigations were performed on the pineals obtained immediately after slaughter (performed between 11:30 and 12:00 a.m.) from 4-month-old gilts. The fixation procedures were conducted with the use of pyroantimonate, which reacted with calcium ions and formed electron dense precipitates. The precipitates were found both in the intercellular spaces and in cells - pinealocytes, gial cells, endothelial cells and fibroblasts. The precipitates were much more numerous in the intercellular spaces than in the cells. Amount and distribution of precipitates differed significantly between pinealocytes, therefore two types of cells were distinguished. The first type of pinealocytes included cells containing a small or moderate amount of precipitates. They were usually characterized by light or dark cytoplasm and large variability in number and structure of dense bodies. Pinealocytes classified to the second type possessed large or very large content of precipitates. These cells were characterized by electron dense cytoplasm and showed the presence of numerous dense bodies. In both types of pinealocytes, precipitates were present in the nucleus and in the cytoplasm. In nuclei, precipitates were numerous in nucleoplasma and rather infrequently noted between membranes of the nuclear envelope. In the cytoplasm deposits were found in mitochondria, vesicles and cisterns of smooth endoplasmic reticulum, in the Golgi apparatus and in cytosol. The amount of precipitates in glial cells, endothelial cells and fibrocytes was lower than in pinealocytes.
Celem pracy była analiza ultracytochemiczna rozmieszczenia jonów wapniowych w szyszynce świni domowej. Badano szyszynki pobrane bezpośrednio po uboju (wykonanym między godz. 11:30 a 12:00) od loszek w wieku ok. 4 miesięcy. Do utrwalania gruczołów zastosowano pyroantymonian potasu, co umożliwiło związanie jonów wapniowych w postaci elektronowo gęstych precypitatów, których rozmieszczenie określono za pomocą mikroskopu elektronowego. Precypitaty występowały w przestrzeni międzykomórkowej oraz w komórkach: pinealocytach, komórkach glejowych, komórkach śródbłonka naczyń włosowatych i fibrocytach. Zawartość złogów pyroantymonianu wapnia była znacznie większa w przestrzeni zewnątrzkomórkowej niż wewnątrz komórek. Ze względu na ilość i lokalizację precypitatów możliwe było wyróżnienie dwóch typów pinealocytów. Pierwszy z nich stanowiły komórki zawierające małą lub średnią ilość precypitatów. Komórki te charakteryzowały się elektronowo jasną lub elektronowo gęstą cytoplazmą, a skład ciałek gęstych był zróżnicowany pod względem ilościowym i jakościowym. Drugi typ pinealocytów stanowiły komórki z dużą lub bardzo dużą zawartością precypitatów. Najczęściej charakteryzowały się one elektronowo gęstą cytoplazmą oraz obecnością bardzo licznych ciałek gęstych. W obu typach pinealocytów precypitaty występowały zarówno w jądrze komórkowym, jak i w cytoplazmie. W jądrze stosunkowo liczne precypitaty o zróżnicowanych wymiarach stwierdzono w obrębie chromatyny, natomiast jedynie sporadycznie obserwowano je w przestrzeni między błonami otoczki jądrowej. W cytoplazmie precypitaty występowały w mitochondriach, pęcherzykach i cysternach siateczki śródplazmatycznej gładkiej, strukturach aparatu Golgiego oraz w cytoplazmie podstawowej. Zawartość precypitatów w komórkach glejowych, komórkach środbłonka oraz fibrocytach była znacznie mniejsza niż w pinealocytach.

Źródło:

Journal of Elementology; 2007, 12, 4; 335-346
1644-2296

Pojawia się w:

Journal of Elementology

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:

The structure of the Ca2+-ATPase of sarcoplasmic reticulum.

Autorzy:

Martonosi, Anthony
Pikula, Slawomir

Powiązania:

https://bibliotekanauki.pl/articles/1043610.pdf

Data publikacji:

2003

Wydawca:

Polskie Towarzystwo Biochemiczne

Tematy:

calcium pump
calcium homeostasis
calcium transport
skeletal and cardiac muscles
sarcoplasmic reticulum
excitation-contraction coupling

Opis:

In this article the morphology of sarcoplasmic reticulum, classification of Ca2+-ATPase (SERCA) isoenzymes presented in this membrane system, as well as their topology will be reviewed. The focus is on the structure and interactions of Ca2+-ATPase determined by electron and X-ray crystallography, lamellar X-ray and neutron diffraction analysis of the profile structure of Ca2+-ATPase in sarcoplasmic reticulum multilayers. In addition, targeting of the Ca2+-ATPase to the sarcoplasmic reticulum is discussed.

Źródło:

Acta Biochimica Polonica; 2003, 50, 2; 337-365
0001-527X

Pojawia się w:

Acta Biochimica Polonica

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:

Ocena bioaktywnosci dwufazowych materiałów implantacyjnych na bazie fosforanów wapnia i półwodnego siarczanu (VI) wapnia
Evaluation of bioactivity of biphasic implant materials based on the calcium phosphates and calcium sulfate hemihydrate

Autorzy:

Siek, D.
Zima, A.
Paszkiewicz, Z.
Ślósarczyk, A.

Powiązania:

https://bibliotekanauki.pl/articles/284440.pdf

Data publikacji:

2012

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

fosforany wapnia
siarczan(VI) wapnia
bioaktywność
calcium phosphate
calcium sulfate
bioactivity

Opis:

Fosforany wapnia (Calcium Phosphates - CaPs), stosowane z powodzeniem w regeneracji i rekonstrukcji tkanki kostnej, należą do grupy bioaktywnych materiałów zdolnych do bezpośredniego wiązania z kością. Interesującymi materiałami implantacyjnymi w postaci łatwo formujących się past cementowych są materiały dwufazowe na bazie HA (hydroksyapatytu) i α-TCP (α-fosforanu trójwapniowego) oraz HA i CSH (półwodnego siarczanu (VI) wapnia). Wprowadzenie do struktury hydroksyapatytu różnych jonów np. srebra lub magnezu wpływa na zmianę jego właściwości fizykochemicznych jak również biologicznych. Połączenie hydroksyapatytu i półwodnego siarczanu (VI) wapnia (ten drugi stosowany jest w medycynie od wielu lat pod nazwą Plaster of Paris) prowadzi do wytworzenia materiałów o wysokiej poręczności chirurgicznej i kontrolowanej biodegradacji. Celem pracy było wytworzenie oraz ocena potencjału bioaktywnego in vitro nowych materiałów kościozastępczych typu cementowego na bazie CaPs i CSH. W skład wyjściowych proszków cementowych wchodziły: zsyntezowany na wydziale Inżynierii Materiałowej i Ceramiki - AGH hydroksyapatyt dotowany srebrem (AgHA), węglanowy hydroksyapatyt dotowany magnezem (MgCHA), α-TCP oraz CSH (Acros Or- ganics). Jako płyny do zarabiania proszków cementowych zastosowano 1% roztwór chitozanu w 0,3% kwasie octowym oraz 0,75% roztwór metylocelulozy w 2% Na2HPO4. Opracowane materiały implantacyjne poddano badaniom czasu wiązania, składu fazowego oraz wytrzymałości mechanicznej. Wytworzone preparaty kościozastępcze przetrzymywano w symulowanym płynie fizjologicznym (SBF) przez okres 14 dni. Oznaczono zmiany stężenia pierwiastków: Ag, Ca, K, Mg, Na, S, P w płynie SBF w czasie trwania inkubacji wykorzystując technikę emisyjnej spektrometrii optycznej z indukcyjnie sprzężoną plazmą (IC- P-OES). Przeprowadzono przy pomocy skaningowego mikroskopu elektronowego obserwacje morfologii powierzchni uzyskanych materiałów po 7 i 14 dniach przetrzymywania ich w symulowanym płynie fizjologicznym. Badania SEM potwierdziły narastanie warstwy apatytowej na powierzchniach badanych preparatów, co wskazuje na ich charakter bioaktywny. Materiały implantacyjne, w których zastosowano półwodny siarczan (VI) wapnia, w związku z ich dużą podatnością do dezintegracji i biodegradacji, wykazywały odmienną morfologię powierzchni w porównaniu do preparatów, w których składnikiem wiążącym był α-TCP Wzrost zawartości: Ca i S w płynie SBF podczas trwania inkubacji badanych cementów z udziałem CSH po twierdziło ich stopniową degradację in vitro.
Calcium Phosphates (CaPs), used successfully in the regeneration and reconstruction of bone tissue, belong to the group of bioactive materials, capable to form a direct bond with natural bone. Biphasic materials (bone substitutes) based on HA (hydroxyapatite) and α-TCP (α-tricalcium phosphate) as well as HA and CSH (calcium sulfate hemihydrate) in the form of easily shapeable cement pastes are very interesting implant materials. Introduction of different ions such as silver or magnesium into the structure of hydroxyapatite changes its physicochemical and biological properties. The combination of hydroxyapatite and calcium sulfate hemihydrate (the last one has been used in medicine for many years under the name of Plaster of Paris) leads to the fabrication of materials with high surgical handiness and controlled biodegradation. The aim of this study was development and evaluation of the bioactive potential in vitro of the new cement type bone substitutes based on CaPs and CSH. Initial cement powders consisted of synthesized at the Faculty of Materials Science and Ceramics - AGH-UST silver doped hydroxyapatite (AgHA), magnesium doped carbonated hydroxyapatite (MgCHA), α-TCP and CSH (Acros Organics). 1 wt.% chitosan solution in 0.3 wt.% acetic acid as well as 0.75 wt. % methylcellulose solution in 2 wt.% Na2HPO4 were applied as liquid phases. Setting time, phase composition and mechanical strength of developed implant materials were examined. Obtained bone substitutes were incubated in simulated body fluid (SBF) for 14 days. Changes in the concentration of the following elements: Ag, Ca, K, Mg, Na, S, P in SBF were determined by simultaneous inductively coupled plasma optical emission spectrometry (ICP-OES). Observations of the surface morphology of obtained materials after 7 and 14 days of incubation in simulated body fluid were carried out using scanning electron microscopy. SEM studies confirmed the growth of an apatite layer on the surfaces of tested materials, what indicates on their bioactivity. Implant materials based on calcium sulfate hemihydrate, due to their high susceptibility to disintegration and biodegradation, showed a different surface morphology compared to the materials based on a-TCP as a binding agent. The increase in the content of Ca and S elements in SBF during the incubation of studied bone cements with CSH confirmed their gradual degradation in vitro.

Źródło:

Engineering of Biomaterials; 2012, 15, no. 116-117 spec. iss.; 73-74
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:

The role of storage reservoirs in reducing calcium migration from agricultural catchments
Znaczenie zbiornika retencyjnego w ograniczeniu migracji wapnia ze zlewni rolniczej

Autorzy:

Koc, J
Duda, M.

Powiązania:

https://bibliotekanauki.pl/articles/16175.pdf

Data publikacji:

2009

Wydawca:

Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza

Tematy:

storage reservoir
calcium migration
reduction
agricultural catchment
water
calcium content

Opis:

This study was conducted on a storage reservoir situated in a valley, in the lower course of the Sząbruk stream in north-eastern Poland, the Olsztyn Lakeland mesoregion. The catchment area of the Sząbruk stream consists of an agricultural and an afforested part. A storage reservoir is found in the lower part of the Sząbruk stream valley. The reservoir was built 25 years ago. It is enclosed by a dike and equipped with an outlet box. Outflows from the reservoir pass through the terminal segment of the Sząbruk stream to Lake Wulpińskie. The results of the experiment indicate that the calcium content of water evacuated from the catchment was determined by the type and intensity of catchment use, ranging from 22.3 mg Ca⋅dm-3 to 178 mg Ca⋅dm-3. The highest calcium concentrations, 113 mg Ca⋅dm-3 on average, were noted in the agricultural catchment connected to a drainage network; lower levels, 78.7 mg Ca⋅dm-3, were found in farming areas drained via ditches, while the lowest Ca content in water, 38.7 mg Ca⋅dm-3 on average, was determined in outflows from afforested catchments. Calcium concentrations were lower during the growing season in all studied catchment types. The calcium load discharged from the catchment dependnded on the catchment management. The highest calcium loss per area unit was observed in the drained agricultural catchment (76.6 kg Ca⋅ha-1⋅year-1), followed by the catchment drained via ditches (56.3 Ca⋅ha-1⋅year-1) and the afforested catchment (31.8 Ca⋅ha-1⋅year-1). Despite the inflow of calcium-rich drainage water, calcium concentrations decreased by 11%, from 56.8 mg Ca⋅dm-3 to 50.3 mg Ca⋅dm-3, after the stream’s waters passed through the storage reservoir. An increase in Ca levels was noted in the girdling ditch. The flow of water through the ditch minimizes sedimentation, and higher quantities of Ca were supplied with drainage water. The reservoir accumulated 242.4 kg Ca per ha in the course of one year, mostly in the growing season (83%). The above indicates high involvement of biological processes. The reservoir fulfilled the role of a barrier inhibiting calcium loss from the catchment.
Badania prowadzono na zbiorniku retencyjnym położonym w dolinie końcowego biegu strugi Sząbruk położonej w północno-wschodniej Polsce, w mezoregionie Pojezierza Olsztyńskiego. Zlewnia strugi Sząbruk składa siê z części leśnej i rolniczej. W dolnej części doliny strugi Sząbruk jest położony zbiornik retencyjny wykonany przed 25 laty, zamknięty groblą i mnichem. Odpływy ze zbiornika kierowane są końcowym odcinkiem strugi Sząbruk do Jeziora Wulpińskiego. W wyniku badań stwierdzono, że stężenie wapnia w wodzie odpływającej ze zlewni zależało od sposobu i intensyfikacji użytkowania i mieściło się w granicach od 22,3 mg Ca⋅dm-3 do 178 mg Ca⋅dm-3. Najwyższe stężenie, średnio 113 mg Ca⋅dm-3, wystąpiło w wodach zlewni rolniczych odwadnianych siecią drenarską, niższe, średnio 78,7 mg Ca⋅dm-3, w wodach z terenów rolniczych odwadnianych rowami, a najniższe, średnio 39,7 mg Ca⋅dm-3, w wodach ze zlewni leśnej. We wszystkich zlewniach cząstkowych mniejsze stężenia wapnia, stwierdzono w okresie wegetacyjnym niż poza nim. Ładunek wapnia odprowadzany z obszaru zlewni był uzależniony od sposobu jej zagospodarowania. Największy odpływ wapnia z jednostki powierzchni stwierdzono w zlewni rolniczej zdrenowanej (76,6 kg Ca⋅ha-1⋅rok-1), mniejszy ze zlewni odwadnianej rowami (56,3 kg Ca⋅ha-1⋅rok-1) i najmniejszy ze zlewni leśnej (31,8 kg Ca⋅ha-1⋅rok-1). W wyniku przepływu wody przez zbiornik retencyjny następowało zmniejszenie w niej stężenia wapnia o 11%, z 56,8 mg Ca⋅dm-3 do 50,3 mg Ca⋅dm-3, pomimo zasilania zasobnymi w wapń wodami drenarskimi. W wodach przepływających rowem opaskowym stwierdzono wzrost stężeń Ca, gdyż w czasie przepływu rowem procesy sedymentacji są dużo mniejsze, a o wzroście stężeń zadecydowało zasilanie wodami drenarskimi. W ciągu roku w misie zbiornika zostało zakumulowane 242,4 kg Ca na 1 ha jego powierzchni, z czego większość (83%) w okresie wegetacyjnym. Świadczy to o istotnym udziale procesów biologicznych. Zbiornik retencyjny pełnił funkcję bariery zatrzymującej odpływ związków wapnia ze zlewni.

Źródło:

Journal of Elementology; 2009, 14, 3; 467-476
1644-2296

Pojawia się w:

Journal of Elementology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 12.

Tytuł:

A novel member of the thermolysin family, cloning and biochemical characterization of metalloprotease from Staphylococcus pseudintermedius

Autorzy:

Wladyka, Benedykt
Bista, Michal
Sabat, Artur
Bonar, Emilia
Grzeszczuk, Sabina
Hryniewicz, Waleria
Dubin, Adam

Powiązania:

https://bibliotekanauki.pl/articles/1040710.pdf

Data publikacji:

2008

Wydawca:

Polskie Towarzystwo Biochemiczne

Tematy:

staphylococcus
calcium
metalloprotease
pathogen

Opis:

Thermolysins constitute a family of secreted bacterial metalloproteases expressed, among others, by several pathogens. Strains of Staphylococcus pseudintermedius isolated from diseased dogs and judged as protease-positive, by skim milk agar plate culture, were investigated for protease content. No proteolytic activity was detected when the bacteria were grown in regular liquid media. Unexpectedly, supplementation of the medium with calcium ions resulted in expression of a metalloprotease and profound changes in the profile of extracellular proteins. On the basis of homology to other staphylococcal metalloproteases, the nucleotide sequence of the gene encoding this protease (Pst) and its flanking regions was determined. The full-length pst codes for a protein with an open reading frame of 505 amino acids. The internal region contains the HEXXH catalytic domain that is conserved in members of the thermolysin family. Regardless of the presence of calcium in the medium, the expression of the protease gene was of the same intensity. This suggests that regulation of the metalloprotease production by calcium ions is at a post-transcriptional level. Isolates of S. pseudintermedius exhibit a proteolytic phenotype due to the metalloprotease expression, however only in presence of calcium ions, which most probably stabilize the structure of the protease.

Źródło:

Acta Biochimica Polonica; 2008, 55, 3; 525-536
0001-527X

Pojawia się w:

Acta Biochimica Polonica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 13.

Tytuł:

Use of calcite in tricalcium phosphate based chemically bonded biomaterials

Autorzy:

Ślosarczyk, A.
Czechowska, J.
Zima, A.

Powiązania:

https://bibliotekanauki.pl/articles/284790.pdf

Data publikacji:

2017

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

biomaterials
calcium phosphates
bones

Źródło:

Engineering of Biomaterials; 2017, 20, no. 143 spec. iss.; 12
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:

Extracellular polymeric substance of Rhodococcus opacus bacteria effects on calcium carbonate formation

Autorzy:

Szcześ, A.
Czemierska, M.
Jarosz-Wilkołazka, A.
Magierek, E.
Chibowski, E.
Hołysz, L.

Powiązania:

https://bibliotekanauki.pl/articles/109802.pdf

Data publikacji:

2018

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

calcium carbonate
exopolymer
mineralization

Opis:

An extracellular substance extracted from the bacterial strain Rhodococcus opacus was used as a template for calcium carbonate precipitation from CaCl2 and Na2CO3 solutions at 25 and 37 °C. Obtained crystals were characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD) and Raman spectroscopy. Kinetics of precipitation was investigated by conductivity measurements. The obtained results show that the used biopolymer does not affect the crystal structure but acts as a nucleation centers leading to the formation of calcite crystals with the regular size. This effect is concentration dependent i.e. the EPS concentration increase causes the crystal size decreases, and is greater if calcium chloride solution if mixed with EPS 15 min before the addition of sodium carbonate solution. The temperature increase strengthens this effect.

Źródło:

Physicochemical Problems of Mineral Processing; 2018, 54, 1; 142-150
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 15.

Tytuł:

Age-dependent changes in the calcium concentration in womens bones and teeth

Autorzy:

Fischer, A.
Brodziak-Dopierala, B.
Stojko, J.

Powiązania:

https://bibliotekanauki.pl/articles/1192510.pdf

Data publikacji:

2020

Wydawca:

Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza

Tematy:

calcium
bones
teeth
AAS

Opis:

The inorganic part of bone tissue is mainly composed of Ca. In adult people, the resorption processes lead to the removal of minerals from calcified tissues. Women’s bodies are particularly vulnerable to a decrease in the concentration of Ca because the osteolysis processes that occur with age are compounded by hormonal changes during the menopause. The aim of the study was to determine the age-dependent concentration of Ca in the bones and teeth of adult women. The object of the research was calcified tissues bones and teeth (n=323). Samples were taken from women aged 26 - 85 years (mean: 55.7 years), living in Poland, in the Silesian Province. Samples were submitted to wet microwave mineralization (spectrally pure nitric acid). The Ca concentration in teeth and bones was determined with the AAS method. The concentration of Ca in the tested samples of calcified tissues from women aged 26 - 85 years was 10.1‑32.0%, and the average concentration was 16.7±3.5% in bones and 22.2±4.7% in teeth. The calcified tissues, from both bones and teeth, show a progressive decrease in the Ca concentration that occurs as women age. The decreasing level of Ca in bone and teeth was statistically significant (p<0.05). There was a difference in what age calcium is released from bones and teeth. The research showed that a decrease in the Ca concentration in bone tissue occurs earlier than it happens in teeth (about 10 years). The decrease in the Ca concentration in calcified tissues of teeth was slight greater than in bones, indicating slightly greater mobilization of Ca from the tissues of teeth.

Źródło:

Journal of Elementology; 2020, 25, 4; 1319-1331
1644-2296

Pojawia się w:

Journal of Elementology

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 16.

Tytuł:

Bioceramic micro and nanoparticles as functional biological materials

Autorzy:

Parakhonskiy, B.
Saveleva, M.
Svenskaya, Y.
Ivanova, A.
Lengert, E.
Alebastrova, A.
Yashchenok, A.
Gorin, D.
Bukreeva, T.
Marchenko, I.
Douglas, T.
Skirtach, A.

Powiązania:

https://bibliotekanauki.pl/articles/284720.pdf

Data publikacji:

2017

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

calcium carbonate
biomaterials
properties

Źródło:

Engineering of Biomaterials; 2017, 20, no. 143 spec. iss.; 77
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 17.

Tytuł:

Surfactant-assisted fabrication and evaluation of macroporous calcium phosphate bone cements

Autorzy:

Cichoń, E.
Zima, A.
Ślósarczyk, A.

Powiązania:

https://bibliotekanauki.pl/articles/286139.pdf

Data publikacji:

2018

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

bone cements
calcium
phosphate

Źródło:

Engineering of Biomaterials; 2018, 21, 148; 56
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 18.

Tytuł:

Thermal behaviour of functionally graded sodium-containing calcium phosphates

Autorzy:

Goncharenko, A.
Rokhmistrov, D.
Zyman, Z.

Powiązania:

https://bibliotekanauki.pl/articles/284065.pdf

Data publikacji:

2012

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

calcium phosphate
hydroxyapatite
orthopedics

Opis:

Hydroxyapatite (HA), ß-tricalcium phosphate (ß-TCP) and their mixtures have been successfully applied in orthopedic, oral and maxillofacial surgery [1]. Calcium phosphate (CP) bioactive ceramics based on HA is usually fabricated of appropriate powders. Unfortunately, mechanical properties of such material are in general worse than those of human bone. Therefore, there is a necessity for development of new ceramic CP composites with improved characteristics. An effective biomaterial must simultaneously possess various, often contradictory, properties [2]. A functionally graded material (FGM) with gradients in composition, phase and microstructure from the surface to the interior can better satisfy such combined requirements. Recently, FGM's of sodium-containing calcium phosphates were prepared expecting them to have improved circumstances for bone formation and bonding [3-4]. The aim of this work was to study the thermal behavior of FGM's of sodium - containing calcium phosphates prepared by an original route. The initial powder was prepared by a simple one-step precipitation using Ca(NO3)2 and Na3PO4 reactants. The synthesis reaction resulted, besides HA, in the by product NaNO3. However, the latter was not washed out of the precipitate but rather used as a source of sodium for ceramics preparation. An original molding step was used resulted in gradient distribution of NaNO3 in compacts. They were sintered under usual conditions. It has been found that the linear (or volume) shrinkage and the density slightly changed in the fired compacts below 1100°C. However, the consolidation abruptly increased at 11000C. The poor sintering is associated with NaNO3 decomposition during heating and firing at temperatures below 11000C. At higher temperatures, reactions between HA particles and products of NaNO3 decomposition occurred and dif¬fusion processes were intensified. Due to the gradient distribution of NaNO3 in the compacts, the indicated thermal processes resulted in formation of functionally graded ceramics (having in particular a phase gradient from the surface to the interior as Na3Ca6(PO4)5\to ß- rhenanite\to Na+ solid solution in HA).

Źródło:

Engineering of Biomaterials; 2012, 15, no. 116-117 spec. iss.; 139
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 19.

Tytuł:

Electrochemical impedance spectroscopy as a mean of measuring film thickness of calcium sulfate precipitate on an XC70 carbon steel

Autorzy:

Lanez, T.
Chaabia, N.
Belaid, A.

Powiązania:

https://bibliotekanauki.pl/articles/412077.pdf

Data publikacji:

2014

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

EIS
calcium sulphate
thickness

Opis:

In this paper we present the use of electrochemical impedance spectroscopy measurement as a tool to measure the thickness of calcium sulphate film formed on an XC70 carbon steel. The solution used is a mixture of sodium sulphate and calcium chloride solution at different concentrations. The film thickness of calcium sulphate is estimated, after an immersion time of 4 days. The results indicate reciprocal relationship between measured capacitance and thickness of calcium sulphate film.

Źródło:

International Letters of Chemistry, Physics and Astronomy; 2014, 13, 1; 54-61
2299-3843

Pojawia się w:

International Letters of Chemistry, Physics and Astronomy

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 20.

Tytuł:

The effect of progesterone on oxytocin-stimulated intracellular Ca2plus mobilisation and prostaglandin secretion in porcine endometrium

Autorzy:

Kotwica, G.
Oponowicz, A.
Kurowicka, B.
Franczak, A.
Bogacka, I.

Powiązania:

https://bibliotekanauki.pl/articles/31688.pdf

Data publikacji:

2010

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

progesterone
oxytocin
intracellular calcium
calcium
prostaglandin secretion
porcine endometrium
endometrium
pregnancy
pig
hormone

Opis:

We have studied in the porcine endometrium the expression of oxytocin receptor (OTR) mRNA and the effect of progesterone (P₄) on oxytocin/oxytocin receptor (OT/OTR) function concerning intracellular Ca²⁺mobilisation ([Ca²⁺]i), prostaglandin F2α (PGF2α) and E2 (PGE2; PG) secretion. Tissue was taken from cyclic and early pregnant pigs (days 14-16). A higher expression of OTR mRNA (P<0.05) was observed in the endometrium of cyclic than pregnant pigs. The stimulatory (P<0.05) effect of OT (10⁻⁷ M) on [Ca²⁺]i mobilisation was noticed within 15-60 s and 30-60 s in endometrial stromal cells of cyclic and pregnant pigs, respectively. In the presence of P₄ (10⁻⁵ M) basal and OT-stimulated [Ca²⁺]i concentrations decreased in stromal cells during luteolysis and pregnancy. In stromal cells P₄ delayed mobilisation of [Ca²⁺]i in response to OT by 15 s during luteolysis and had no effect during pregnancy. In cyclic and pregnant epithelial cells OT stimulated mobilisation of [Ca²⁺]i in 45 s and 60 s, respectively. Oxytocin increased (P<0.05) PGF2α secretion during luteolysis and pregnancy and PGE2 during luteolysis from endometrial slices. Progesterone did not inhibit this stimulatory effect. During luteolysis OT increased (P<0.05) PGF2α in epithelial and stromal cells and PGE2 secretion in epithelial cells. In the presence of P₄ this effect of OT was reduced only in stromal cyclic cells (6 h culture). The presence of P₄ decreased the effect of OT on [Ca²⁺]i mobilisation only in stromal cells. We found that, in most conditions, P₄ did not inhibit the OT-stimulated secretion of PG in the porcine endometrium.

Źródło:

Polish Journal of Veterinary Sciences; 2010, 13, 4
1505-1773

Pojawia się w:

Polish Journal of Veterinary Sciences

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 21.

Tytuł:

Content and uptake of phosphorus and calcium with the yield of potato tubers depending on cultivation operations
Zawartosc oraz pobranie fosforu i wapnia z plonem bulw ziemniaka w zaleznosci od zabiegow agrotechnicznych

Autorzy:

Zarzecka, K
Gugala, M.

Powiązania:

https://bibliotekanauki.pl/articles/15906.pdf

Data publikacji:

2010

Wydawca:

Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza

Tematy:

phosphorus content
phosphorus uptake
calcium content
calcium uptake
yield
potato
tuber
cultivation operation

Opis:

In 2002-2004, a study was carried out, based on a field experiment set up on soil of very good rye complex. The experiment was designed as randomized sub-blocks with three replications. Two methods of soil tillage, conventional and simplified tillage, and seven weeding methods such as application of the following herbicides 1) control object – without herbicides, 2) Plateen 41,5 WG , 3) Plateen 41,5 WG + Fusilade Forte 150 EC, 4) Plateen 41,5 WG + Fusilade Forte 150 EC + adjuvant Atpolan 80 EC, 5) Barox 460 SL, 6) Barox 460 SL + Fusilade Forte 150 EC, 7) Barox 460 SL + Fusilade Forte 150 EC + adjuvant Atpolan 80 EC), constituted experimental factors. Phosphorus content in the tubers of cultivar Wiking potato was determined by colorimetry and calcium was tested by the atomic absorption spectrophotometry method (AAS). Phosphorus and calcium content and their uptake with tubers yield significantly depended on the tillage methods and weed control methods as well as weather conditions in the study years. Potato tubers from the simplified tillage cultivation had more phosphorus than tubers whose cultivation was based on the conventional tillage, in contrast to calcium, which was more abundant in tubers from the conventional method. The herbicides significantly reduced the phosphorus content and increased the calcium content compared with the control object. Phosphorus and calcium uptake by potato was significantly higher in the conventionally tilled treatments compared with the simplified method, and in the herbicide-treated plots compared with the mechanically cultivated control treatment.
W latach 2002-2004 przeprowadzono badania oparte na doświadczeniu polowym założonym na glebie kompleksu żytniego bardzo dobrego. Doświadczenie założono metodą losowanych podbloków w trzech powtórzeniach. Badanymi czynnikami były 2 sposoby uprawy roli – tradycyjna i uproszczona oraz 7 sposobów pielęgnacji z zastosowaniem herbicydów 1) obiekt kontrolny – bez herbicydów, 2) Plateen 41,5 WG , 3) Plateen 41,5 WG + Fusilade Forte 150 EC, 4) Plateen 41,5 WG + Fusilade Forte 150 EC + adiuwant Atpolan 80 EC, 5) Barox 460 SL, 6) Barox 460 SL + Fusilade Forte 150 EC, 7) Barox 460 SL + Fusilade Forte 150 EC + adiuwant Atpolan 80 EC). Zawartość fosforu w suchej masie bulw ziemniaka oznaczono kolorymetrycznie, a wapnia – metodą absorpcyjnej spektrofotometrii atomowej (ASA). Zawartość fosforu i wapnia i ich pobranie z plonem bulw zależały istotnie od sposobów pielęgnacji i warunków pogodowych w latach badań. Więcej fosforu zawierały bulwy ziemniaka z uprawy uproszczonej w porównaniu z tradycyjną, a więcej wapnia z uprawy tradycyjnej. Herbicydy zastosowane w pielęgnacji wpłynęły na obniżenie zawartości fosforu i podwyższenie zawartości wapnia w porównaniu z bulwami z obiektu kontrolnego. Pobranie fosforu i wapnia z plonem bulw ziemniaka było istotnie większe na obiektach z uprawą tradycyjną niż uproszczoną oraz na obiektach odchwaszczanych chemicznie w stosunku do obiektu kontrolnego pielęgnowanego wyłącznie mechanicznie.

Źródło:

Journal of Elementology; 2010, 15, 2; 385-392
1644-2296

Pojawia się w:

Journal of Elementology

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 22.

Tytuł:

Triggering of erythrocyte membrane blebbing by ciprofloxacin

Autorzy:

Shabir, Kashif
Jilani, Kashif
Zbidah, Mohanad
Riaz, Muhammad
Bibi, Ismat
Asghar, Asma

Powiązania:

https://bibliotekanauki.pl/articles/895372.pdf

Data publikacji:

2019-10-30

Wydawca:

Polskie Towarzystwo Farmaceutyczne

Tematy:

oxidative stress
calcium
cell size

Opis:

An extensively used fluoroquinolone antibiotic ciprofloxacin shows a broad-spectrum antibacterial activity against both gram-positive and gram-negative strains. It works mainly by the inhibition of DNA gyrase and topoisomerase IV which results in impaired DNA replication leading towards microbial cell death. Eryptosis is an alternative term used for suicidal erythrocyte death. In current study, eryptotic effect of ciprofloxacin was investigated by exposing erythrocytes for 48 hours to the different concentrations (45-90µM) of ciprofloxacin. The experimental work related to the investigation of eryptosis was done by cell size measurement and confirmation of calcium role in membrane blebbing. As a possible mechanism of eryptosis, oxidative stress induced by ciprofloxacin was determined by catalase, glutathion peroxidase and superoxide dismutase activities measurement. Similarly, necrotic effect of ciprofloxacin was also illustrated by hemolysis measurement. Results of our study revealed that the therapeutical doses of ciprofloxacin may induce oxidative stress by significant decrease in superoxide dismutase, catalase and glutathione peroxidase activities as well as induce eryptosis, featured by erythrocytes membrane blebbing and hemolysis.

Źródło:

Acta Poloniae Pharmaceutica - Drug Research; 2019, 76, 5; 901-906
0001-6837
2353-5288

Pojawia się w:

Acta Poloniae Pharmaceutica - Drug Research

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 23.

Tytuł:

Vitamin C decreases intracellular calcium level in human lymphoid cells

Autorzy:

Ozturk, G.
Mulholland, C.W.
Hannigan, B.M.

Powiązania:

https://bibliotekanauki.pl/articles/70935.pdf

Data publikacji:

2001

Wydawca:

Polskie Towarzystwo Fizjologiczne

Tematy:

intracellular calcium
vitamin C
calcium
ascorbic acid
man
lymphocyte
lymphoid cell
leucocyte
antioxidative enzyme

Źródło:

Journal of Physiology and Pharmacology; 2001, 52, 2
0867-5910

Pojawia się w:

Journal of Physiology and Pharmacology

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 24.

Tytuł:

Effect of vitamin D3-enriched diet on intestinal calcium absorption in rats intoxicated with carbaryl and thiram

Autorzy:

Witkowska, D.
Oledzka, R.
Sedrowicz, L.
Duliban, D.
Szelachowska, M.

Powiązania:

https://bibliotekanauki.pl/articles/1371489.pdf

Data publikacji:

1992

Wydawca:

Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie

Tematy:

diet
calcium transport
carbaryl
vitamin D3
intestinal calcium absorption
pesticide
thiram
rat

Źródło:

Polish Journal of Food and Nutrition Sciences; 1992, 01, 4; 89-96
1230-0322
2083-6007

Pojawia się w:

Polish Journal of Food and Nutrition Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 25.

Tytuł:

Integration of trace elements into calcium phosphate coatings on titanium and their characterization in vitro

Autorzy:

Wolf-Brandstetter, C.
Urbanek, S.
Beutner, R.
Scharnweber, D.
Moseke, C.

Powiązania:

https://bibliotekanauki.pl/articles/284770.pdf

Data publikacji:

2017

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

calcium phosphate
titanium alloys
biomaterials

Źródło:

Engineering of Biomaterials; 2017, 20, no. 143 spec. iss.; 79
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 26.

Tytuł:

Short calcium phosphate whiskers for medical applications

Autorzy:

Biernat, M.
Jaegermann, Z.
Tymowicz-Grzyb, P.
Konopka, G.
Ciołek, L.
Pęczkowski, P.
Taźbierski, P.

Powiązania:

https://bibliotekanauki.pl/articles/285379.pdf

Data publikacji:

2017

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

calcium phosphates
whiskers
biomedical applications

Źródło:

Engineering of Biomaterials; 2017, 20, no. 143 spec. iss.; 17
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 27.

Tytuł:

Conversion and polymer-based coatings as strategies to increase corrosion resistance of biodegradable magnesium-calcium alloys

Autorzy:

Karaś, M.
Boczkal, S.
Domalik-Pyzik, P.

Powiązania:

https://bibliotekanauki.pl/articles/285944.pdf

Data publikacji:

2017

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

magnesium-calcium alloys
biodegradation
coatings

Źródło:

Engineering of Biomaterials; 2017, 20, no. 143 spec. iss.; 78
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 28.

Tytuł:

Ca-deficient hydroxyapatite scaffolds from injectable calcium phosphate/chitosan cements

Autorzy:

Rajzer, I.
Castano, O.
Engel, E.
Planell, J. A.

Powiązania:

https://bibliotekanauki.pl/articles/283850.pdf

Data publikacji:

2010

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

calcium phosphate cement
injectability
chitosan

Opis:

Calcium phosphate cement (CPC) has been success-fully used in bone tissue regeneration for many years. However, poor mechanical properties and low biodegradation rate limit any further applications. R-cement has a higher solubility than conventional CPC and its reaction products (CDHA) are similar to the mineral phase of bone. In this work we have developed new CPC composition which consists of a mix of cement R, glycerol as a liquid phase carrier and a biodegradable hydrogel (chitosan) which acts as a binder and was incorporated into R-cement to strengthen this biomaterial. The cement past was found to be stable in a syringe (even after two month of storage in the freezer) and hardened only after being exposed to biological fluids.

Źródło:

Engineering of Biomaterials; 2010, 13, 92; 2-4
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 29.

Tytuł:

The effect of chronic exercise on a biomarker of bone resorption in healthy adults

Autorzy:

Yusni, Yusni
Rahman, Safrizal

Powiązania:

https://bibliotekanauki.pl/articles/551546.pdf

Data publikacji:

2019

Wydawca:

Stowarzyszenie Przyjaciół Medycyny Rodzinnej i Lekarzy Rodzinnych

Tematy:

exercise
calcium
bone resorption
adult

Opis:

Background. Long-term exercise contributes to the inhibition of osteoblast cell activity and to the decrease of bone resorption. Objectives. The research objective was to analyze the chronic effect of regular, long-term physical activity and physical inactivity on carboxyterminal collagen cross-linking telopeptide levels (CTx) and calcium levels in healthy adults. Material and methods. This study was a prospective cohort study. Fifty-four men and women, aged 17–26 years, were divided into 2 groups of 27 people each: exercise and non-exercise. This research was carried out from April 2015 to April 2016 at the Faculty of Medicine, Syiah Kuala University, Aceh, Indonesia. Bone resorption can be determined by measuring the carboxyterminal cross-linking telopeptide of collagen (CTx). The data were analyzed using Student’s t-test and regression correlation analysis with a significance level of 5%. Results. The highest levels of CTx were found in the non-exercise group; the lowest levels of CTx were in the exercise group (1.6 ng/mL and 0.30 ng/mL, respectively). This difference in CTx levels between groups was statistically significant (0.52 ± 0.22 ng/mL vs 0.72 ± 0.28 ng/mL; p = 0.005). Calcium was significantly higher in the exercise group than in the non-exercise one (9.67 ± 0.30 vs 9.01 ± 0.21 mg/dl; p = 0.006). There was a negative correlation between calcium levels and CTx in the exercise group (r = 0.038; p = 0.001). Conclusions. Regular exercise led to lower CTx levels and increased calcium levels. The increase in calcium is an effect of the decrease in CTx in healthy adults. Regular exercise decreases bone resorption and increases bone calcium

Źródło:

Family Medicine & Primary Care Review; 2019, 3; 270-276
1734-3402

Pojawia się w:

Family Medicine & Primary Care Review

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 30.

Tytuł:

Polarograficzne mikrooznaczanie wapnia w surowicy krwi
Polarograficheskoe mikrooboznachenie kalcja v syvorodke krovi
Polarographic microdetermination of calcium in blood serum

Autorzy:

Brzezinska, Z.
Szyszko, E.

Powiązania:

https://bibliotekanauki.pl/articles/871929.pdf

Data publikacji:

1962

Wydawca:

Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny

Tematy:

krew
surowica krwi
wapn
zawartosc wapnia
oznaczanie
blood
blood serum
calcium
calcium accumulation
determination

Źródło:

Roczniki Państwowego Zakładu Higieny; 1962, 13, 2
0035-7715

Pojawia się w:

Roczniki Państwowego Zakładu Higieny

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 31.

Tytuł:

Tlenek wapnia – metoda oznaczania

Autorzy:

Surgiewicz, J.

Powiązania:

https://bibliotekanauki.pl/articles/138500.pdf

Data publikacji:

2012

Wydawca:

Centralny Instytut Ochrony Pracy

Tematy:

wapń
tlenek wapnia
metoda analityczna
narażenie zawodowe
calcium
calcium oxide
analytical method
occupational exposure

Opis:

Metoda polega na pobraniu tlenku wapnia na filtr membranowy w celu osadzenia na nim związku zawartego w powietrzu, następnie mineralizacji filtra stężonym kwasem azotowym i oznaczeniu wapnia w roztworze przygotowanym do analizy metodą absorpcyjnej spektrometrii atomowej z zastosowaniem płomienia powietrze-acetylen. Oznaczalność metody wynosi 0,12 mg/m3.
This method is based on stopping selected calcium oxide on a membrane filter, mineralizing the sample with concentrated nitric acid and preparing the solution for analysis in diluted nitric acid. Calcium oxide in the solution is determined as calcium with flame atomic absorption spectrometry. The detection limit for calcium oxide in this method is 0.12 mg/m3.

Źródło:

Podstawy i Metody Oceny Środowiska Pracy; 2012, 1 (71); 129-133
1231-868X

Pojawia się w:

Podstawy i Metody Oceny Środowiska Pracy

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 32.

Tytuł:

Dietary Pattern and its Relationship Between Bone Mineral Density in Girls and Boys with Cystic Fibrosis – preliminary report
Sposób żywienia i jego związek z gęstością mineralną kości u dziewcząt i chłopców z mukowiscydozą

Autorzy:

Sands, Dorota
Mielus, Monika
Umławska, Wioleta
Lipowicz, Anna
Oralewska, Beata
Walkowiak, Jarosław

Powiązania:

https://bibliotekanauki.pl/articles/1032977.pdf

Data publikacji:

2015

Wydawca:

Wydawnictwo ALUNA

Tematy:

adolescents
calcium
densitometry
nutrition
vitamin D

Opis:

Background: Nutrition influence on cystic fibrosis (CF) patients survival is well documented and dietary therapy is one of basic elements of their treatment. Prolonged survival of CF patients might yet emerge comorbidities, which include bone mineral disease. The aim: The assessment of the dietary pattern and its relationship between bone density in boys and girls with cystic fibrosis. Material and methods: 89 patients aged 10-18 years from 3 Polish CF Centres were included into the study. To obtain a knowledge about quality of diet, a 3-day food record was assessed and percent of recommended for CF patients intake of energy, protein, carbohydrates, fat, vitamin D3, calcium, phosphorus was counted. Bone mineral density (BMD) in lumbar spine (L1-L4) was measured and expressed as a Z-score. To assess nutritional status, anthropometric measurements was evaluated (body weight, height and BMI). Descriptive methods, Mann-Whitney test, T-Student test, Spearman correlation and one-way ANOVA were used for statistical analyses. Results: The patients with cystic fibrosis did not meet specific for CF nutritional guidelines. A deficiency in recommended intake was observed in energy (88%), protein (82%), calcium (78%) and vitamin D3 (71%). The intake of phosphorus was higher than recommended (142%). A nutritional status was significantly reduced, as compared with the reference group (p<0.001). Boys characterized significantly lower body weight (p=0.019) and height (p=0.036) than girls as well as worse caloric (p=0.023) and carbohydrates intake (p=0.005). However, girls had reduced vitamin D3 content in their diet (p<0.001). The bone mineral density in the whole group was reduced and Z-score amounted to -0.95±1.17. Tendency to decreasing of BMD with age was observed. BMI showed important correlation with bone mineral density both in girls (p<0.001) and in boys (p=0.020). Conclusion: CF patients do not follow specific for them dietary recommendations and essential differences were observed between girls and boys. Nutritional status (BMI) showed correlation with bone mineral density in CF patients. Therefore intensive nutritional therapy according to recommendations is needed.
Wprowadzenie: Wpływ żywienia na długość życia chorych z mukowiscydozą (ang. Cystic Fibrosis − CF) jest dobrze udokumentowany, a postępowanie dietetyczne jest jednym z podstawowych elementów leczenia pacjentów z CF. Systematyczne wydłużanie się wieku przeżycia chorych może powodować ujawienie się niedoborów żywieniowych prowadzących do chorób towarzyszących, jakimi są m.in. zaburzenia w gospodarce mineralnej kości. Cel: Celem pracy była ocena sposobu żywienia dziewcząt i chłopców z mukowiscydozą i jego związku z gęstością mineralną kości. Materiał imetody: Do badania włączono 89 pacjentów wwieku 10-18 lat. Wcelu ustalenia jakości diety, oceniono sposób żywienia za pomocą zapisu 3-dniowych jadłospisów, obliczając procent realizacji zapotrzebowania zgodnie z rekomendacjami opracowanymi dla pacjentów z mukowiscydozą. Dotyczyło to pokrycia zapotrzebowania kalorycznego, białka, tłuszczu, węglowodanów, witaminy D3, wapnia i fosforu. Oceniono gęstość mineralną kości (Bone Mineral Density − BMD) w odcinku lędźwiowym (L1-L4). Wynik wyrażono, jako wartość standaryzowaną Z-score. W celu określenia stanu odżywienia dokonano pomiarów antropometrycznych (masa i wysokość ciała oraz BMI). Wykonano następujące obliczenia statystyczne: analizy opisowe, test Manna-Whitneya, test t-Studenta, korelację Spearmana, oraz jednoczynnikową analizę wariancji ANOVA. Wyniki: Badani pacjenci nie spełniali opracowanych dla chorych na mukowiscydozę zaleceń żywieniowych. W diecie zaobserwowano niedobory energii (88% normy), białka (82%), wapnia (78%) oraz witaminy D3 (71%). Wykazano nadmierne spożycie fosforu (142%). Stan odżywienia (parametry antropometryczne) badanej grupy był obniżony i w sposób statystycznie istotny różnił się od grupy referencyjnej (p<0,001). Chłopcy charakteryzowali się znacznie niższą masą ciała (p=0,019) iwysokością (p=0,036) niż dziewczęta, a także niższą kalorycznością diety (p=0,023) oraz zawartością węglowodanów (p=0,005). Dietę dziewcząt cechowała mniejsza zawartość witaminy D3 w diecie (p<0,001) w porównaniu do chłopców. Średnia wartość gęstości mineralnej kości w całej grupie była obniżona i wynosiła -0,95±1,17. Zaobserwowano tendencję do obniżania się BMD wraz z wiekiem. Stan odżywienia wyrażony jako BMI wykazał statystycznie istotną korelację z gęstością mineralną kości, zarówno u dziewcząt (p<0,001), jak i u chłopców (p=0,020). Wnioski: Pacjenci z CF nie przestrzegali opracowanych dla nich zaleceń dietetycznych. Zaobserwowano istotne różnice między dziewczętami i chłopcami. Stan odżywienia (BMI), wykazał korelację z gęstością mineralną kości (BMD), co wymaga intensywnej terapii żywieniowej, zgodnie z opracowanymi rekomendacjami.

Źródło:

Developmental Period Medicine; 2015, 1; 105-113
1428-345X

Pojawia się w:

Developmental Period Medicine

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 33.

Tytuł:

Development and validation of analytical method for assessment of calcium dobesilate in varied hydrogel compositions

Autorzy:

Lisik, Anna
Pilch, Ewa
Słowiak, Laura
Musiał, Witold

Powiązania:

https://bibliotekanauki.pl/articles/895665.pdf

Data publikacji:

2018-08-31

Wydawca:

Polskie Towarzystwo Farmaceutyczne

Tematy:

HPLC
Hydrogel
validation
calcium dobesilate
methylcellulose

Opis:

Standardized analytical methods for testing pharmaceutical preparations are not readily available in the literature for calcium dobesilate hydrogels. The aim of the study was to develop and validate analytical method for methylcellulose gel containing calcium dobesilate as an active ingredient. Samples from dissolution experiments were assessed via HPLC with UV-VIS detector. The optimal composition of mobile phase included acetonitrile with water 1:1, acidified to 2.5 pH value. The applied column was Standard Purospher Star 18e 250 x 4.6 (5µm), and the maximum wavelength was set on 240 nm, at 25 °C. The total run time of analysis was set at 5 min and acquired retention time was 2.7 and 3.1 min for calcium dobesilate depending on the hydrogel formulation. Validity study of the method revealed that all obtained calibration curves showed good linearity (r2 > 0.9927). Linearity (100% level) was found to be 99.42, 100.12, 99.48, 99.89, 100.70, 100.08, 99.82, 100.23 for A, B, C, D, E, F, G and H formulation, respectively. Accuracy was in the range of 98-102% on three different spike levels for all eight formulations. Precision results was around 100% with RSD lower than 1% in all cases indicating that the method can be used as a validated method. Limit of quantitation (LOQ) was found to be 13.25 μg∙ml-1 for all eight formulations. The method is feasible for evaluation of hydrophilic gels with calcium dobesilate.

Źródło:

Acta Poloniae Pharmaceutica - Drug Research; 2018, 75, 4; 843-849
0001-6837
2353-5288

Pojawia się w:

Acta Poloniae Pharmaceutica - Drug Research

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 34.

Tytuł:

Reducing Creep Rate of polypropylenes by Soaking Solid solutions of CaCO3

Autorzy:

Hussain, Randa K.
Dagher, Hala F.
Khudadad, Rasol Rahman

Powiązania:

https://bibliotekanauki.pl/articles/1182918.pdf

Data publikacji:

2016

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

creep
polypropylene
calcium carbonate
creep rate

Opis:

The creep behavior of Polypropylene and Polypropylene/Calcium Carbonate were investigated by tested them at different concentration of Calcium carbonate filler (filler addition is done by soaked pp samples in CaCO3 solution) at different temperatures. A dramatically changed in the FTIR was observed when pp soaked in CaCO3 solution comparing with pristine one. It was found that the creep rate was lowered comparing to the pure Polypropylene. The Creep behavior of the polymer formed was observed to increase with increase in temperature and stress, Calcium carbonate enhanced creep rate and rapture time.

Źródło:

World Scientific News; 2016, 49, 2; 90-103
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 35.

Tytuł:

Calcium carbonate mineralization. Part 1, The effect of poly(ethylene glycol) concentration on the formation of precipitate

Autorzy:

Polowczyk, I.
Bastrzyk, A.
Kozlecki, T.
Sadowski, Z.

Powiązania:

https://bibliotekanauki.pl/articles/110925.pdf

Data publikacji:

2013

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

calcium carbonate
calcite
vaterite
mineralization
PEG

Opis:

In this study, the role of polymer in precipitation has been examined by studying the effect of poly(ethylene glycol) (PEG) on the formation of calcium carbonate particles. The CaCO3 particles were characterized by several techniques, such as FTIR, XRD, SEM, and particle size distribution analysis. In the absence of polymer, the mixing of reagents in an aqueous solution led to the formation of calcite crystals. Introduction of poly(ethylene glycol) molecules reduced the rate of crystallization process, and the effect was concentration dependent. In the presence of 0.05, 0.1, and 0.5 % of PEG, after 5 minutes of precipitation initiation, vaterite microspheres appeared in the system and which were transformed into calcite crystals after 24 hours. The calcium carbonate obtained with PEG was characterized by smaller sized particles in comparison with the ones without polymer.

Źródło:

Physicochemical Problems of Mineral Processing; 2013, 49, 2; 631-639
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 36.

Tytuł:

Analysis of factors affecting the development of hypocalcaemia after multinodular goitre surgery

Autorzy:

Papaj, Piotr
Kozieł, Sławomir
Mrowiec, Sławomir

Powiązania:

https://bibliotekanauki.pl/articles/1393196.pdf

Data publikacji:

2017

Wydawca:

Index Copernicus International

Tematy:

thyroidectomy
hypocalcemia
calcium
TSH
multinodular goiter

Opis:

Introduction: Thyroidectomy is a common surgery performed especially in treatment of multinodular goitre. The most common post-thyroidectomy complication is a postoperative hypocalcaemia, and the percentage of postoperative hypoparathyroidism could reach even 50%. Tested group and methods: A forward-looking, randomized testing was done on a group of 113 women being subject to multinodular goitre surgery. In this article, we wish to present an analysis of the results obtained in the control group, focusing on the predicative factors which determine the development of postoperative hypocalcaemia. Obtained results: The rate of postoperative biochemical hypocalcaemia development was significantly higher in the group of patients, where the preoperative calcium concentration was lower than 2,4 mmol/l. In that group, the development of biochemical hypocalcaemia was observed in 93,7% of cases (30 out of 32 patients), in comparison with 65,3% (17 out of 26) in the group of higher preoperative concentration of calcium. The highest risk of occurrence of postoperative hypocalcaemia was borne by the total thyroidectomy, while the lowest one by the subtotal thyroid lobectomy of one lobe only. Conclusions: A higher preoperative concentration of calcium in blood serum is related to the lower rate of occurrence of postoperative biochemical hypocalcaemia. However, no such correlation was revealed in the case of postoperative symptomatic hypocalcaemia. Lack of correlation was determined between the preoperative concentration of TSH and FT4 in blood serum and the rate of occurrence of postoperative hypocalcaemia, both symptomatic and asymptomatic. The performed statistics did not reveal a relation between the postoperative hypocalcaemia and the duration of the surgery, but a significant correlation was stated with the scope of the performed surgery. Revealing a relation between the rate of occurrence of postoperative hypocalcaemia and the experience of the surgeon performing the surgery was not successful.

Źródło:

Polish Journal of Surgery; 2017, 89, 2; 26-30
0032-373X
2299-2847

Pojawia się w:

Polish Journal of Surgery

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 37.

Tytuł:

Effects of $Ca{2+}$ and $SO_4^{2-}$ ions on fluorite flotation

Autorzy:

Xun, Luobing
Hu, Jiacheng
Shi, Qing
Zhang, Guofan

Powiązania:

https://bibliotekanauki.pl/articles/1448205.pdf

Data publikacji:

2021

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

fluorite
flotation
calcium cation
sulphate anion

Opis:

The effects of $Ca^{2+}$ and $SO_4^{2-}$ on the flotation behaviour of fluorite with sodium oleate as a collector and the underlying mechanism by which these effects were investigated via micro-flotation experiments, solution chemistry calculations, and X-ray photoelectron spectroscopy. The results indicated that the addition of $SO_4^{2-}$ and $Ca^{2+}$ inhibited fluorite flotation and the inhibition effect was increased by the addition of pH. This was mainly due to the increase of the sulphate-containing components in the solution and the adsorption of $SO_4^{2-}$ on the surface of fluorite. With the increase of pH, the alkalinity of the solution increases, OH- and more $SO_4^{2-}$ are further adsorbed on the fluorite surface, thereby reducing the recovery of fluorite flotation.

Źródło:

Physicochemical Problems of Mineral Processing; 2021, 57, 2; 95-104
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 38.

Tytuł:

Kinetic Study of Adsorption of Metal Ions (Iron and Manganese) in Groundwater Using Calcium Carbide Waste

Autorzy:

Karim, Muhammad Arief
Nasir, Subriyer
Widowati, Tri Wardani
Hasanudin, Udin

Powiązania:

https://bibliotekanauki.pl/articles/24201681.pdf

Data publikacji:

2023

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

calcium carbide residual
iron
manganese
groundwater

Opis:

Calcium carbide waste (CCW), the rest of the carbide welding workshop industry, is available in quite a lot and is immediately disposed of into the environment. Because CWW has a high pH value and a large specific surface area, it can act as an adsorbent in removing metals from groundwater. The content of metals in groundwater is indicated by a reddish color; however, upon contact with air, groundwater oxidation causes iron ions and manganese ions to precipitate. Synthetic groundwater was prepared in this experiment using reagents containing and . Observations were made in a batch process to assess the potential and ability of CCW to reduce iron and manganese levels in groundwater. In this study, to achieve equilibrium, CCW was mixed with 100 mL of synthetic solution and shaken at 25°C with a shaker. Operating time, levels of Fe(II) and (Mn(II) metals, and the mass of CCW were some of the parameters studied in this study. CCW was very good at reducing levels of iron ions and manganese ions after 60 minutes of operation. The percentage of removal of iron and manganese ions respectively – successively increased from 93.765 to 97.99% for iron ions and manganese ions from 91.83 to 95.14% for the initial concentration range of 40 mg/L, 60 mg/L, 80 mg/L, and 100 mg/L. Furthermore, the adsorption kinetics of CCW adsorbent in a mixture of iron ion and manganese ion solutions is a second-order kinetic equation. This confirms that the adsorption of CCW on iron ions and manganese ions is a chemisorption process. Calcium carbide waste has the potential to act as an absorbent of heavy metals in groundwater, especially iron and manganese ions.

Źródło:

Journal of Ecological Engineering; 2023, 24, 5; 155--165
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 39.

Tytuł:

Free intracellular calcium [(CA2plus)i] in opioid sensitive cells of the porcine anterior pituitary

Autorzy:

Szafranska, B.
Tilton, J.E.

Powiązania:

https://bibliotekanauki.pl/articles/69614.pdf

Data publikacji:

2000

Wydawca:

Polskie Towarzystwo Fizjologiczne

Tematy:

naloxone
pig
anterior pituitary
intracellular calcium
calcium
opioid
hypothalamic hormone
gonadotrophin releasing hormone
in vitro

Źródło:

Journal of Physiology and Pharmacology; 2000, 51, 3
0867-5910

Pojawia się w:

Journal of Physiology and Pharmacology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 40.

Tytuł:

Luminescence Properties of CaAl₂O₄:Eu³⁺, Gd³⁺ Phosphors Synthesized by Combustion Synthesis Method

Autorzy:

Verma, N.
Singh, K.
Marí, B.
Mollar, M.
Jindal, J.

Powiązania:

https://bibliotekanauki.pl/articles/1030093.pdf

Data publikacji:

2017-10

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

phosphors
luminescence
combustion method
calcium aluminate

Opis:

CaAl₂O₄:Eu³⁺ (1 mol.%) co-doped with varying concentration of Gd³⁺ (1, 2, 5, and 10 mol.%) were prepared by combustion synthesis method at 600°C and further annealed at 1000°C. All the compositions were investigated for their structural and photoluminescence properties. It was observed that both states of europium i.e. Eu³⁺ and Eu²⁺ were present and ratio of these states changes on heating at 1000°C. The materials synthesized at 600°C showed high intense peak around 440 nm due to presence of Eu²⁺ and less intense peaks in the red region which were due to presence of Eu³⁺. On annealing the compounds at 1000°C, intensity of peak around 440 nm decreases and intensity of peaks in the red region increases significantly. The ⁵D₀ → ⁷F₃ transition due to Eu³⁺ at 657 nm appears as the highest intensity peak. All co-doped samples annealed at 1000°C showed the higher intensity than the mono doped sample which is due to energy transfer from the Gd³⁺ to Eu³⁺. The second rare-earth ion (Gd³⁺) acts as sensitizer and enhances the photoluminescence intensity. The X-ray diffraction spectra reveal the monoclinic phase of CaAl₂O₄ in all the samples which showed that Eu³⁺ and Gd³⁺ do not change the crystalline structure of calcium aluminate.

Źródło:

Acta Physica Polonica A; 2017, 132, 4; 1261-1264
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 41.

Tytuł:

Investigating the selectivity of calcium hypochlorite for flotation separation of chalcopyrite and pyrite pre-adsorbed collector

Autorzy:

Yang, Wenhui
Qiu, Xianhui
Yan, Huashan
Wu, Hao
Yang, Liu
Lai, Ruisen
Qiu, Tingsheng

Powiązania:

https://bibliotekanauki.pl/articles/2146919.pdf

Data publikacji:

2022

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

pyrite
chalcopyrite
calcium hypochlorite
flotation separation

Opis:

Bulk flotation is usually used in the flotation of Cu-Fe sulfide ore, and the subsequent concentrate is difficult to be separated because the minerals have adsorbed the collector. In this paper, flotation tests showed that calcium hypochlorite (Ca(ClO)2) had a stronger depression effect on pyrite pre-adsorbed sodium butyl xanthate (SBX), while having a negligible depressive effect on chalcopyrite. A copper concentrate with Cu grade of 33.32% and Cu recovery of 94.47% could be obtained from flotation tests of mixed minerals. The depression performance and mechanism of Ca(ClO)2 were studied by contact angle measurements, Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy analyses, the results suggested that Ca(ClO)2 can decomposes SBX on the pyrite surface and oxidizes the mineral surface to form hydrophilic substances, which enhances the hydrophilicity of the pyrite surface. In contrast, Ca(ClO)2 has little effect on chalcopyrite pre-adsorbed SBX, the possible depression model is discussed.

Źródło:

Physicochemical Problems of Mineral Processing; 2022, 58, 4; art. no. 150703
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 42.

Tytuł:

Regulation of Ca2+ release from internal stores in cardiac and skeletal muscles.

Autorzy:

Wrzosek, Antoni

Powiązania:

https://bibliotekanauki.pl/articles/1044313.pdf

Data publikacji:

2000

Wydawca:

Polskie Towarzystwo Biochemiczne

Tematy:

Ca2+-induced Ca2+ release
calcium channels
dihydropyridine receptor
calcium sparks
excitation-contraction coupling
ryanodine receptor

Opis:

It is widely accepted that Ca2+ is released from the sarcoplasmic reticulum by a specialized type of calcium channel, i.e., ryanodine receptor, by the process of Ca2+-induced Ca2+ release. This process is triggered mainly by dihydropyridine receptors, i.e., L-type (long lasting) calcium channels, directly or indirectly interacting with ryanodine receptor. In addition, multiple endogenous and exogenous compounds were found to modulate the activity of both types of calcium channels, ryanodine and dihydropyridine receptors. These compounds, by changing the Ca2+ transport activity of these channels, are able to influence intracellular Ca2+ homeostasis. As a result not only the overall Ca2+ concentration becomes affected but also spatial distribution of this ion in the cell. In cardiac and skeletal muscles the release of Ca2+ from internal stores is triggered by the same transport proteins, although by their specific isoforms. Concomitantly, heart and skeletal muscle specific regulatory mechanisms are different.

Źródło:

Acta Biochimica Polonica; 2000, 47, 3; 705-723
0001-527X

Pojawia się w:

Acta Biochimica Polonica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 43.

Tytuł:

Toxicological and cytophysiological aspects of lanthanides action.

Autorzy:

Pałasz, Artur
Czekaj, Piotr

Powiązania:

https://bibliotekanauki.pl/articles/1044234.pdf

Data publikacji:

2000

Wydawca:

Polskie Towarzystwo Biochemiczne

Tematy:

gadolinium
cytochrome P450.
calcium
lanthanides
metals

Opis:

Lanthanides, also called rare-earth elements, are an interesting group of 15 chemically active, mainly trivalent, f-electronic, silvery-white metals. In fact, lanthanides are not as rare as the name implies, except for promethium, a radioactive artificial element not found in nature. The mean concentrations of lanthanides in the earth's crust are comparable to those of life-important elements like iodine, cobalt and selenium. Many lanthanide compounds show particular magnetic, catalytic and optic properties, and that is why their technical applications are so extensive. Numerous industrial sources enable lanthanides to penetrate into the human body and therefore detailed toxicological studies of these metals are necessary. In the liver, gadolinium selectively inhibits secretion by Kupffer cells and it decreases cytochrome P450 activity in hepatocytes, thereby protecting liver cells against toxic products of xenobiotic biotransformation. Praseodymium ion (Pr3+) produces the same protective effect in liver tissue cultures. Cytophysiological effects of lanthanides appear to result from the similarity of their cationic radii to the size of Ca2+ ions. Trivalent lanthanide ions, especially La3+ and Gd3+, block different calcium channels in human and animal cells. Lanthanides can affect numerous enzymes: Dy3+ and La3+ block Ca2+-ATPase and Mg2+-ATPase, while Eu3+ and Tb3+ inhibit calcineurin. In neurons, lanthanide ions regulate the transport and release of synaptic transmitters and block some membrane receptors, e.g. GABA and glutamate receptors. It is likely that lanthanides significantly and uniquely affect biochemical pathways, thus altering physiological processes in the tissues of humans and animals.

Źródło:

Acta Biochimica Polonica; 2000, 47, 4; 1107-1114
0001-527X

Pojawia się w:

Acta Biochimica Polonica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 44.

Tytuł:

Smooth muscle actomyosin promotes Ca2+-dependent interactions between annexin VI and detergent-insoluble glycosphingolipid-enriched membrane domains.

Autorzy:

Babiychuk, Victoria
Draeger, Annette
Babiychuk, Eduard

Powiązania:

https://bibliotekanauki.pl/articles/1044291.pdf

Data publikacji:

2000

Wydawca:

Polskie Towarzystwo Biochemiczne

Tematy:

annexins
calcium
rafts
smooth muscle
cell membrane

Opis:

The mechanical link coupling cytoskeletal and contractile proteins to the sarcolemma of smooth muscle cells is essential for transmitting tension from the cell's interior to exterior. In addition to the well-characterized actin-integrin associations present in adhaerens junctions, our recent work has postulated the existence of a reversible annexin-dependent membrane-cytoskeleton complex, forged in response to a rise in intracellular Ca2+ concentration following smooth muscle cell stimulation (Babiychuk et al., J. Biol Chem. 1999, 274, 35191-35195). Detailed biochemical characterization of the interactions responsible for the formation of this complex revealed that annexins II and VI interact with actomyosin, or detergent-insoluble glycosphingolipid-enriched membrane domains (rafts) purified from smooth muscle, in a concentration- and Ca2+-dependent manner. Annexin II interacted with lipid rafts with high Ca2+-sensitivity, while for annexin VI this interaction required non-physiologically high concentrations of free Ca2+. However, the Ca2+-sensitivity of the latter interaction strongly increased in the presence of purified smooth muscle actomyosin. The detailed biochemical analysis of the interactions occurring between annexin II, annexin VI, actomyosin and rafts suggests that annexins regulate sarcolemmal organization during smooth muscle cell contraction.

Źródło:

Acta Biochimica Polonica; 2000, 47, 3; 579-589
0001-527X

Pojawia się w:

Acta Biochimica Polonica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 45.

Tytuł:

Content of calcium and phosphorus and the Ca:P ratio is selected species of leguminous and herbaceous plants

Autorzy:

Grzegorczyk, S.
Alberski, J.
Olszewska, M.
Grabowski, K.
Bałuch-Małecka, A.

Powiązania:

https://bibliotekanauki.pl/articles/1190201.pdf

Data publikacji:

2017

Wydawca:

Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza

Tematy:

grasslands
legumes
herbs
calcium
phosphorus
Ca:P

Opis:

Green fodder plays a key role in nutrition of ruminants, and its quality is determined by the species composition of meadow and pasture swards. Legumes and herbs are generally more abundant in nutrients, especially minerals, than grasses. Calcium (Ca) and phosphorus (P) are particularly important for animal health. The dietary levels of Ca and P should be balanced to increase their availability and utilization. The aim of this study was to determine the content of calcium and phosphorus and the Ca:P ratio in selected legume and herb species from extensively used grasslands in the Olsztyn Lakeland. The study covered the following species of leguminous plants: Trifolium pratense, Trifolium repens, Lotus corniculatus, Lathyrus pratensis, Lotus uliginosus and Vicia cracc, and herbaceous plants: Taraxacum officinale, Achillea millefolium, Plantago lanceolata, Alchemilla vulgaris, Heracleum sibiricum and Cirsium oleraceum. The investigated legumes and herbs differed significantly in their Ca and P content and the Ca: P ratio. All the species were abundant in Ca, and two taxa: Cirsium oleraceum and Heracleum sibiricum, were characterized by particularly high levels of calcium. The highest levels of phosphorus were noted in Heracleum sibiricum, whereas the lowest content of P was determined in Alchemilla vulgaris, Cirsium oleraceum and Trifolium pratense. Cirsium oleraceum was abundant in Ca and deficient in P, hence it was distinguished by the widest Ca:P ratio. Legumes and herbs are valuable components of meadow sward and a rich source of minerals, in particular Ca, in animal diets.

Źródło:

Journal of Elementology; 2017, 22, 2; 663-669
1644-2296

Pojawia się w:

Journal of Elementology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 46.

Tytuł:

Influence of dietary calcium intake on quantitative and qualitative parameters of bone tissue in Polish adults

Autorzy:

Skowrońska-Jóźwiak, Elżbieta
Jaworski, Maciej
Lorenc, Roman
Lewiński, Andrzej

Powiązania:

https://bibliotekanauki.pl/articles/990986.pdf

Data publikacji:

2016

Wydawca:

Instytut Medycyny Wsi

Tematy:

calcium intake
bone mineral density
bone stiffness

Opis:

Introduction. The objective of the study was to assess dietary calcium intake in the Polish population and its influence on selected parameters of bone tissue. Materials and method. 1,129 osteoporosis treatment–naive subjects, aged 20–80 years, randomly selected, were involved in the study. Bone status was established using densitometry of spine and hip and quantitative ultrasound of the calcaneus. Dietary calcium intake was calculated according to data gathered in a questionnaire. Results. Median calcium intake was 746 mg; 72% of subjects had calcium intake below the recommended dose. Calcium intake correlated negatively with age (r = -0.15; p<0.001) and positively with BMD in the spine (r = 0.06; p<0.05) and in the femoral neck (r = 0.07; p < 0.05). In subjects with the lowest calcium intake, a significantly lower femoral neck BMD and heel stiffness was noticed than in subjects with the highest calcium intake. However, multiple regression analysis showed that dietary calcium was not a predictor of low BMD, both in the hip and spine, as well as of bone stiffness in contrast to age, low BMI and female gender (p<0.0001). In all factors regression analysis, a weak influence of calcium intake on BMD was shown only in the subgroup of premenopausal women (β = 0.1; p<0.05). Conclusions. In most subjects, dietary calcium intake was below the recommended dose; however, its influence on bone seems to be weak, except for persons with the greatest deficiency of dietary calcium and the subgroup of premenopausal women.

Źródło:

Annals of Agricultural and Environmental Medicine; 2016, 23, 3
1232-1966

Pojawia się w:

Annals of Agricultural and Environmental Medicine

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 47.

Tytuł:

Precipitated calcium carbonate production, synthesis and properties

Autorzy:

Erdogan, N.
Eken, H. A.

Powiązania:

https://bibliotekanauki.pl/articles/110023.pdf

Data publikacji:

2017

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

precipitated calcium carbonate
waste marble powder
whiteness

Opis:

Calcium carbonate (CaCO3) is the most widely used filler material in paper, paint, plastic, food, ceramic, cosmetic, medicine and other industries. In the present paper, precipitated calcium carbonate (PCC) has been produced from waste marble powder (WMP) by the Calcination-Dissolution-Precipitation (CDP) method. Calcination, dissolution and precipitation experiments were carried out under various conditions including : calcination temperature (800, 850, 900, 950 and 1000 °C), dissolution time (2.5, 5.0, 7.5 and 10.0 min) and precipitation time (2.5, 5.0, 7.5, 10.0, 12.5 and 15.0 min). Then, XRF, XRD, SEM, particle size, whiteness, brightness and yellowness analyses were performed for the characterization of the produced PCC materials. The analyses showed that the precipitate was mainly micrometer-sized (d50 = 1.682 μm) rhombohedral calcium carbonate crystals with 54.5% CaO. The whiteness, brightness and yellowness tests of the precipitates, conducted by Datacolor Elrepho 450x spectrometer, were determined to be 91.28, 98.2 and 1.99%, respectively. It was finally concluded that the produced PCC material reasonably meets Turkish Standards (TS 11653/1995) and can be used in paper industry.

Źródło:

Physicochemical Problems of Mineral Processing; 2017, 53, 1; 57-68
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 48.

Tytuł:

Analysis of process of removing impurities from calcium carbonate

Autorzy:

Hann, D.
Kortnik, J.

Powiązania:

https://bibliotekanauki.pl/articles/110465.pdf

Data publikacji:

2015

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

calcium carbonate
flotation of graphite
ISO brightness

Opis:

Calcium carbonate is used as an additive in the production of paper and some other production processes. The aim of this study was to determine the chances of the calcite sample to be mechanically cleaned of impurities, so that the material can become commercially interesting, primarily to be sold to the paper and other-related industries. A mineralogical petrographic investigation carried out on a sample of calcite showed that an unfavorable impurity is, in particular, graphite – which is otherwise fairly easily to remove by flotation. Flotation was performed with samples of different particle size. The purpose of this was to find an optimal particle size for carrying out the flotation. In order to achieve an effective flotation results it is first necessary to achieve a proper liberation of grains. The second part of the study was to explore the optimal sequence of treatment procedures for tested calcite, using milling, flotation, and sedimentation.

Źródło:

Physicochemical Problems of Mineral Processing; 2015, 51, 2; 611-619
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 49.

Tytuł:

Studies on the carbonation of Czatkowice limestone in Calcium Looping process

Autorzy:

Tomaszewicz, G.
Kotyczka-Morańska, M.
Plis, A.

Powiązania:

https://bibliotekanauki.pl/articles/778245.pdf

Data publikacji:

2016

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

calcite
limestone
calcium looping
CO2
sorbent

Opis:

The growing demand for the reduction of anthropogenic CO2 emissions has stimulated the development of CO2 capture methods. One of the best capture methods comprises the calcium looping process, which incorporates calcium-based sorbents during the calcination and carbonation cycles. Czatkowice limestone may be considered to be a prospective chemical sorbent for the calcium looping process because of its formation characteristics. This paper addresses the thermogravimetric studies conducted under varying conditions of temperature and various concentrations of CO2 during the carbonation cycles. Moreover, a kinetic analysis of the carbonation stage was performed for the calcined sample at varying temperatures. The kinetic parameters for calcination and diffusion were determined. In addition, there was an increase in the concentration of CO2 with an increased carbonation conversion. The research results demonstrate that in further cycles of carbonation/calcination, the calcium sorbent reaches a higher rate of carbonation conversion with increased levels of CO2

Źródło:

Polish Journal of Chemical Technology; 2016, 18, 2; 53-58
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 50.

Tytuł:

Multifunctional Coagulants Based on Hidrocarboaluminates Calcium

Autorzy:

Sizyakova, E. V.
Ivanov, P. V.

Powiązania:

https://bibliotekanauki.pl/articles/124466.pdf

Data publikacji:

2017

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

hidrocarboaluminates calcium
water treatment
coagulant
ion exchanger

Opis:

The article describes harmful factors from the environmental point of view that accompany almost all stages of the production of non-ferrous metals. Due to the fact that this industry requires large volume of water, these factors require special attention when cleaning wastewater. The contamination of wastewater by non-ferrous metallurgy is characterized by metal ions, particulate pollutants, acids, SAS, etc. A common feature of all these substances is harmfulness, however, they are often very aggressive and toxic. The article focuses on the possible use of hidrocarboaluminates calcium as an active ion exchanger for cleanup wastewater metallurgical production.

Źródło:

Journal of Ecological Engineering; 2017, 18, 2; 16-20
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 51.

Tytuł:

The Decopperization and Coagulation by Use the Carbon-N-Ox Method

Autorzy:

Bydałek, A.
Migas, P.
Wołczyński, W.
Karwan-Baczewska, J.

Powiązania:

https://bibliotekanauki.pl/articles/355826.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

crystals morphology
calcium compounds
copper slag
salts

Opis:

This paper discusses the impact of complex chemical reagents during the process of decopperisation of slag. The beneficial effect of carbide response factors with the participation of nitrogen was indicated as well as the role of stimulators surfactants. Based on the results of the research the basic structure of the slag during decopperisation was systematized. The effects of coagulation of droplets of copper in the slag were shown in this paper.

Źródło:

Archives of Metallurgy and Materials; 2017, 62, 4; 2375-2380
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 52.

Tytuł:

The influence of bilberry fruit on memory and the expression of parvalbumin in the rat hippocampus

Autorzy:

Borowiec, K.
Matysek, M.
Szwajgier, D.
Biała, G.
Kruk-Słomka, M.
Szalak, R.
Ziętek, J.
Arciszewski, M.B.
Targoński, Z.

Powiązania:

https://bibliotekanauki.pl/articles/2087496.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

bilberry
calcium-binding proteins
hippocampus
memory
rat

Źródło:

Polish Journal of Veterinary Sciences; 2019, 3; 481-487
1505-1773

Pojawia się w:

Polish Journal of Veterinary Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 53.

Tytuł:

Could fructan sources in strawberry matrix be more effective as a tool for improvement of bone structure than these compounds added to diet alone? - Study on osteopenic rat model

Autorzy:

Topolska, K.
Radzki, R.P.
Filipiak-Florkiewicz, A.
Bieńko, M.
Florkiewicz, A.
Cieślik, E.

Powiązania:

https://bibliotekanauki.pl/articles/2085394.pdf

Data publikacji:

2020

Wydawca:

Instytut Medycyny Wsi

Tematy:

ovarian hormone deficiency
calcium intake
fructans
bone

Opis:

Introduction. Osteoporosis, a disease associated with ovarian hormone deficiency following menopause, is the most common cause of age-related bone loss. Although an optimal intake of Ca is vital – both bone accretion during growth and maintenance in adult life – a great percentage of the population consumes far below the recommended amounts of this mineral. On the other hand, there are evidences that fructans enhance not only Ca absorption, but bone calcium as well. Objective. In the knowledge that estrogen deficiency and insufficient Ca in the diet during postmenopause cause serious problems with resultant osteoporosis, the aim of this study is to assess the effects of a diet enriched in fructan-containing sources alone, or in the “strawberry matrix”, on the structure of bone in OVX rats under calcium hypoalimentation. Materials and method. Experimental animals were female Wistar rats, sham-operated or ovariectomized. The treatment with Ca-restricted diets also contained one of the sources of fructan (Jerusalem artichoke, yacon, Beneo Orafti Synergy1), in the amount providing 8% of fructans. Femur architecture of rats was assessed by tomography and Ca content by the AAS method. Results. Ovariectomy led to a significant decrease in femoral Ca content, total mineral content and bone density of rats. This study shows that a diet containing inulin-type fructan (especially as a component of strawberry product) improved bone quality (i.e. increase in Ca content in femur, total density in middle part of bone, as well as decrease of endosteal circumference) in OVX rats under calcium hypoalimentation. Conclusions. These findings suggest that a fructan-enriched diet could be potentially useful for postmenopausal osteoporosis. It is important to determine an optimal dietary level of fructan with the long-term goal of developing a dietary strategy in osteoporosis prevention.

Źródło:

Annals of Agricultural and Environmental Medicine; 2020, 27, 1; 19-28
1232-1966

Pojawia się w:

Annals of Agricultural and Environmental Medicine

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 54.

Tytuł:

Effects of tocolytic drugs (isoxsuprine hydrochloride) during the implantation period in pregnant sheep

Autorzy:

Akbulut, N.K.
Kal, Y.

Powiązania:

https://bibliotekanauki.pl/articles/16628474.pdf

Data publikacji:

2022

Wydawca:

Polska Akademia Nauk. Czasopisma i Monografie PAN

Tematy:

isoxsuprine hydrochloride
reproductive parameters
progesterone
cortisol
calcium

Opis:

In this study, the effects of isoxsuprine hydrochloride applied 14 and 15 days after insemination in Anatolian Merino Sheep on lamb yield and some blood parameters were investigated. The research was conducted during the breeding season and 54 ewes inseminated on the same day were used. The ewes were assigned to three groups. Group I: For the placebo effect, physiological saline was injected on the 14th day into half of the control group and on the 15th day into the other half after insemination (n=18). Group II: Tocolytic drug was injected on the 14th day after insemination (n=18). Grop III: Tocolytic drug was injected on the 15th day after insemination (n=18). As the tocolytic drug, isoxsuprine hydrochloride (HCl) 3 ml (Utelax, Sanovel, Türki̇ye) was used intramuscularly. The number of pregnant and viviparous ewes, single and multiple birth ewes, lambs per viviparous ewes were determined as reproductive parameters. Blood progesterone, cortisol and calcium concentration were determined. As a result, it was determined that the single application of isoxsuprine hydrochloride (3 ml) in the implantation period did not have a positive or negative effect on reproductive parameters, and did not change the blood progesterone, calcium and cortisol concentration in ewes.

Źródło:

Polish Journal of Veterinary Sciences; 2022, 25, 4; 557-560
1505-1773

Pojawia się w:

Polish Journal of Veterinary Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 55.

Tytuł:

Efficiency of CaCl2 spray at different fruit development stages on the fruit mineral nutrient accumulation in cv. Hayward kiwifruit

Autorzy:

Shiri, M.A.
Ghasemnezhad, M.
Moghadam, J.F.
Ebrahimi, R.

Powiązania:

https://bibliotekanauki.pl/articles/1188065.pdf

Data publikacji:

2016

Wydawca:

Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza

Tematy:

Actinidia deliciosa
fruit
development stage
mineral nutrient
nutrient accumulation
Hayward cultivar
kiwi fruit
calcium absorption
calcium chloride spray

Opis:

Despite the importance of calcium in many fruit species and the effects of calcium application, there is little or no reliable information on the effect of CaCl2 spray at different fruit development stages on the fruit mineral nutrient content during the growing season and at harvest. Therefore, this study has been conducted to evaluate the effect of calcium chloride (CaCl2, 15 g L-1) spray at different fruit development stages on the accumulation Ca and other macronutrients in cv. Hayward kiwifruit grown at two locations. In order to find the absorbality of Ca at different spraying times, fruits were harvested 7 days after a Ca treatment. Additionally, the mineral composition of kwifruit was determined at the stage of harvest ripeness. The results showed that the absorbality of Ca by kiwifruit from Ca spray decreased significantly with the progressing fruit development. The highest fruit Ca content was found when the fruit plants were sprayed at 35+80 DAFB and 35+80+120 DAFB, irrespectively of the location of an orchard. At a later Ca spraying application, the N content in kiwifruit significantly decreased, but the K and Mg content slightly increased. In contrast, the K/Ca, N/Ca, Mg/Ca and (K+Mg)/Ca ratios of CaCl2 sprayed fruits was lower than in the control and the ratio values were more balanced in the Ca treated fruit than in the control. Overall, three CaCl2 (15 g L-1) sprays could effectively improve the fruit quality by balancing the Ca ratio to other macronutrients. Therefore, Ca spray treatments could be a recommended treatment in growing cv. Hayward kiwifruit.

Źródło:

Journal of Elementology; 2016, 21, 1; 195-209
1644-2296

Pojawia się w:

Journal of Elementology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 56.

Tytuł:

Regulation of cyclooxygenase isoforms in the renal thick ascending limb: effects of extracellular calcium

Autorzy:

Wang, D.
McGiff, J.C.
Ferreri, N.R.

Powiązania:

https://bibliotekanauki.pl/articles/69248.pdf

Data publikacji:

2000

Wydawca:

Polskie Towarzystwo Fizjologiczne

Tematy:

calcium-sensing receptor
arachidonic acid
limb
tumour necrosis factor-alpha
enzyme
kidney
cyclooxygenase
phorbol myristate acetate
extracellular calcium

Źródło:

Journal of Physiology and Pharmacology; 2000, 51, 4,1
0867-5910

Pojawia się w:

Journal of Physiology and Pharmacology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 57.

Tytuł:

Influence of inclusions modification on nozzle clogging
Wpływ modyfikacji wtrąceń niemetalicznych na zarastanie wylewów zanurzeniowych

Autorzy:

Lamut, J.
Falkus, J.
Jurjevec, B.
Knap, M.

Powiązania:

https://bibliotekanauki.pl/articles/354591.pdf

Data publikacji:

2012

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

zatykanie
modyfikacja wtrąceń
gliniany wapnia
siarczki manganu wapnia
clogging
inclusion modification
spinel
calcium aluminates
calcium manganese sulphides

Opis:

During the secondary refining of high strength steel in a ladle furnace aluminum is used for the melt deoxidation. Aluminates inclusions are modified with a calcium silicon injection in a melt. On the basis of the binary diagram CaO-Al203 solid and liquid calcium aluminates with different composition and shape are formed after calcium treatment. During the calcium silicon injection manganese sulphide is also modified and CaS or (Ca, Mn)S is formed and wrapped around calcium aluminates. Because of rising of calcium bubbles during the calcium silicon injection a powerful melt stirring occurs. This enables inclusion coagulation and a reaction with a slag. Additionally, the MgOźAl203 spinels are formed. Clogging of a tundish nozzle may occur during continuous casting of steel billets. Scull which forms on the nozzle's inner wall consists of spinel, calcium aluminates with various composition and calcium manganese sulphide.
W czasie rafinacji pozapiecowej stali o podwyższonej wytrzymałści, jako odtleniacz stosowane jest w piecu kadziowym aluminium. Wtrącenia w postaci tlenków glinu modyfikowane są w tym procesie poprzez wprowadzanie do kąpieli CaSi. Na podstawie analizy układu fazowego CaO-Al2O3 można przewidzieć tworzenie się zróżnicowanych kształtem wtrąceń o składzie stałych lub ciekłych glinianów wapnia. W czasie modyfikacji przemianom podlegają również siarczki manganu tworząc wtrącenia typu CaS oraz (Ca, Mn)S otaczające gliniany wapnia. Z uwagi na wzrost objętości tworzących się w czasie wprowadzania CaSi pęcherzy gazowego wapnia, w procesie zachodzi intensywne mieszanie kąpieli metalowej. Zjawisko to umożliwia koagulację wtrąceń niemetalicznych oraz ich rekcję z żużlem. Dodatkowo zachodzi rónież tworzenie spinelu typu MgOźAl2O3 W procesie ciągłego odlewania kęsów może zachodzić proces zarastania wylewów zanurzeniowych kadzi pośredniej. Narosty, które tworzą się na wewnętrznej ściance wylewu zanurzeniowego zawierają w składzie chemicznym spinel MgOźAl2O3, gliniany wapnia oraz (Ca, Mn)S.

Źródło:

Archives of Metallurgy and Materials; 2012, 57, 1; 319-324
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 58.

Tytuł:

The role of high-grade Bentonite powder in coccidiosis and its effects on feed conversion ratio and blood parameters in broiler chicken

Autorzy:

Hayajneh, F.M.F.
Abdelqader, A.
Alnimer, M.A.
Abedal-Majed, M.A.
Al-Khazaleh, J.

Powiązania:

https://bibliotekanauki.pl/articles/2087366.pdf

Data publikacji:

2020

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

broiler
coccidiosis
calcium bentonite
poultry
triglycerides
protein

Źródło:

Polish Journal of Veterinary Sciences; 2020, 23, 1; 97-107
1505-1773

Pojawia się w:

Polish Journal of Veterinary Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 59.

Tytuł:

Studies on sintering process of synthetic hydroxyapatite

Autorzy:

Malina, Dagmara
Biernat, Kamila
Sobczak-Kupiec, Agnieszka

Powiązania:

https://bibliotekanauki.pl/articles/1039506.pdf

Data publikacji:

2013

Wydawca:

Polskie Towarzystwo Biochemiczne

Tematy:

calcium phosphates
hydroxyapatite
sintering process
wet synthesis

Opis:

In this study the effect of sintering process in different temperatures on microstructure and morphological properties of sintered hydroxyapatite (HAp) was investigated. HAp powder was prepared by wet precipitation method from following reagents: Ca(OH)2 + H3PO4 in an alkaline conditions. Thermal analysis (TA), X-Ray diffraction method (XRD), FT-IR spectrometry (FT-IR) and scanning electron microscopy (SEM) were used to elaborate the phase composition and properties of sintered HAp samples and raw HAp powder as well. The total and apparent density and total porosity of sintered compacts, shrinkage and weight loss during the sintering were also measured. The results show that there is a difference in sintering behavior of synthetic hydroxyapatites depending on sintering temperature. The main differences refer to the loss of mass, shrinkage, changes in porosity and density of the investigated materials.

Źródło:

Acta Biochimica Polonica; 2013, 60, 4; 851-855
0001-527X

Pojawia się w:

Acta Biochimica Polonica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 60.

Tytuł:

Immobilization of Lycinibacillus fusiformis B26 cells in different matrices for use in turquoise blue HFG decolourization

Autorzy:

Dogan, N. M.
Sensoy, T.
Doganli, G. A.
Bozbeyoglu, N. N.
Arar, D.
Akdogan, H. A.
Canpolat, M.

Powiązania:

https://bibliotekanauki.pl/articles/204696.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

agar
calcium alginate
decolourization
FTIR
immobilization
pumice

Opis:

The decolourization of Turquoise Blue HFG by immobilized cells of Lysinibacillus fusiformis B26 was investigated. Cells of L. fusiformis B26 were immobilized by entrapment in agar and calcium alginate matrices and attached in pumice particles. The effects of operational conditions (e.g., agar concentrations, cell concentrations, temperature, and inoculum amount) on microbial decolourization by immobilized cells were investigated. The results revealed that alginate was proven to be the best as exhibiting maximum decolourization (69.62%), followed by agar (55.55%) at 40°C. Pumice particles were the poorest. Optimum conditions for agar matrix were found: concentration was 3%, cell amount was 0.5 g and temperature was 40°C (55.55%). Ca-alginate beads were loaded with 0.5, 1.0 and 2.0 g of wet cell pellets and the highest colour removal activity was observed with 2.0 g of cell pellet at 40°C for alginate beads. Also, 0.5 and 1.0 g of pumice particles that were loaded with 0.25 and 0.5 g of cell pellets respectively were used and the results were found very similar to each other.

Źródło:

Archives of Environmental Protection; 2016, 42, 2; 92-99
2083-4772
2083-4810

Pojawia się w:

Archives of Environmental Protection

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 61.

Tytuł:

Simultaneous determination of Aspirin and Rosuvastatin Calcium in capsules by using RP-HPLC coupled with photo diode array detection

Autorzy:

Panchal, A.
Sanghvi, G.
Vachhani, A.
Sheth, N.
Vaishnav, D.

Powiązania:

https://bibliotekanauki.pl/articles/412028.pdf

Data publikacji:

2014

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

aspirin
rosuvastatin calcium
RP-HPLC
capsule
validation

Opis:

A simple, sensitive, specific, and cost effective method for simultaneous determination of Aspirin and Rosuvastatin calcium was developed and validated in single dosage formulation. The sample solution of ASP and RSTC was prepared using methanol as a solvent. Separation of ASP and RSTC was achieved with a mobile phase consisting of 20 mM KH2PO4 : Methanol (30:70 v/v) at a flow rate of 1.0 ml/min. Separations were performed on Merck hibar 250-4.6 RP18 (5 μm) column (150 mm X 3.0 mm), using a Shimadzu Prominence HPLC system equipped with a Shimadzu SPD-20A detector, Rhenodyne 7725i injector with 20 μL loop, LC-20 AD pump, CBM-20 Alite controller and LC Solution software. Retention times of ASP and RSTC were 3.747 and 5.969 minutes respectively. Absolute recovery of ASP and RSTC was 100.3 and 100.03 % respectively. The lower limit of quantification (LLOQ) of ASP and RSTC was 0.3097 and 0.1063 ppm and lower limit of detection (LLOD) of ASP and RSTC was 0.01535 and 0.01358 ppm respectively. Linearity was established for the range of concentrations 15.00-90.0 μg/ml and 2.0-12.0 μg/ml for ASP and RSTC respectively with the coefficient of determination (R2) of 0.994 and 0.999 for both the compounds. The inter- and intra-day precision in the measurement of ASP quality control (QC) sample 75 μg/ml, were in the range 0.1-0.2 % relative standard deviation (R.S.D.) and 0.2-0.3 % R.S.D., respectively. The inter- and intra-day precision in the measurement of RST quality control (QC) sample 10 μg/ml, were in the range 0.1-0.2 % R.S.D., and 0.0-0.3 % R.S.D., respectively. The developed method would be applicable for routine quality control of ASP And RSTC in bulk as well as in pharmaceutical formulations.

Źródło:

International Letters of Chemistry, Physics and Astronomy; 2014, 14, 2; 218-230
2299-3843

Pojawia się w:

International Letters of Chemistry, Physics and Astronomy

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 62.

Tytuł:

Effect of gasifying agents and calcium oxide on gasification of low-rank coal and wastes

Autorzy:

Baranowski, M.
Pawlak-Kruczek, H.
Frydel, M.

Powiązania:

https://bibliotekanauki.pl/articles/175194.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

gasification
RDF
sewage sludge
lignite
calcium oxide

Opis:

The process of gasification is one of the promising technologies of clean combustible gas production from low-grade coals, such as lignite, coal mud and subbituminous LR coals, and from biomass and waste. However, depending on the type of gasification material, the following aspects require investigation and development: the selection of a gasification technology (including parameters and gasifying agents) and the removal of the components constituting a burden and contamination from the raw gas. This paper presents the results of research on the gasification of lignite and sludge with added refuse derived fuel and the gasification of both these substances with added calcium sorbents. Two gasifying agents, water vapour and carbon dioxide, were used in the experiments, which were carried out in a fixed bed reactor at the temperatures of 600, 700, 800, 900, and 1000 ◦C. The effects of process temperature, the calcium oxide addition and the gasifying agent composition and quantity on fuel conversion and product gas composition have been determined. Higher process temperatures in both atmosphere of gasification (H2O and CO2) cause an increase in the volume fraction of hydrogen and carbon monoxide in the resulting gas. The effect of the addition of calcium oxide (CaO) for carbon dioxide gasification of sewage sludge exhibits the positive effect. The increase in the volume of hydrogen and carbon monoxide in the syngas from gasification of sewage was observed. The gasifying agent has a different effect on the composition of the gas depending on the temperature. The gasification process in the atmosphere of water vapour starts faster than in the atmosphere of carbon dioxide and hydrogen formation is significantly higher.

Źródło:

Transactions of the Institute of Fluid-Flow Machinery; 2017, 137; 141-155
0079-3205

Pojawia się w:

Transactions of the Institute of Fluid-Flow Machinery

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 63.

Tytuł:

Effect of calcium sulfoaluminate additive on linear deformation at different humidity and strength of cement mortars

Autorzy:

Abdulwahid Al-Musawi, Kadhim
Bindhu Abraham, Kottayil
Potses, Tatsiana
Leonovich, Sergey
Kalinouskaya, Natallia
Beulah, M.
Budrevich, Neli

Powiązania:

https://bibliotekanauki.pl/articles/110953.pdf

Data publikacji:

2020

Wydawca:

Centrum Rzeczoznawstwa Budowlanego Sp. z o.o.

Tematy:

shrinkage
cracks
calcium sulfoaluminate additives
expanding additives

Opis:

The effect of calcium sulfoaluminate additives (CSA) on the compression and bending strength of mortar, as well as linear deformation of prism samples at different environmental humidity was studied. Test results indicate that bending strength of mortars with CSA and the referent at the age of 28 days are practically equal. Compressive strength of mortars with CSA reduced by 20 ... 23% for all dosages of CSA. Relative linear deformations depend on the humidity of the environment. At a humidity of 100%, the relative linear deformations are positive and the expansion increases with increasing dosage of the expanding additive. When hardening in dry air at a humidity of 55%, the greatest shrinkage deformations were for mortars with CSA. We can conclude that the expanding effect of CSA is fully manifested at high humidity, i.e. under construction conditions, this means very high-quality moisture care for concrete structures.

Źródło:

Inżynieria Bezpieczeństwa Obiektów Antropogenicznych; 2020, 2; 1-9
2450-1859
2450-8721

Pojawia się w:

Inżynieria Bezpieczeństwa Obiektów Antropogenicznych

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 64.

Tytuł:

Preparation of CaCO3-SiO2 composite with core-shell structure and its application in silicone rubber

Autorzy:

Cui, Ch.
Ding, H.
Cao, L.
Chen, D.

Powiązania:

https://bibliotekanauki.pl/articles/778525.pdf

Data publikacji:

2015

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

calcium carbonate
silica
silicone rubber
mechnao-chemistry

Opis:

A new CaCO_{3-SiO2 composite with core-shell structure was successfully prepared by mechano-chemistry method (MCM). SEM and FTIR indicated that SiO2 particles were homogeneously immobilized on the surface of CaCO3. The well dispersion of this CaCO3-SiO2 composite into silicone rubber can not only reduce the usage amount of SiO2, but also improve the mechanical properties of silicone rubber. By the calculation, the theoretical numbers of the SiO2 particles is about 10 times as large as that of CaCO3 particles in the CaCO3-SiO2 composite. Mixing CaCO3-SiO2 composite in silicone rubber can enhance the breaking strength of the silicone rubber about 18% as high as that when mixing the pure SiO2. And the elongation at break is about 14% less than that of adding the pure SiO2 sample.}

Źródło:

Polish Journal of Chemical Technology; 2015, 17, 4; 128-133
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 65.

Tytuł:

Precipitation of calcium carbonate in the presence of urea at 293 K and 343 K

Autorzy:

Białowicz, K.
Kiełkowska, U.

Powiązania:

https://bibliotekanauki.pl/articles/778787.pdf

Data publikacji:

2014

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

calcium carbonate
precipitation
sodium bicarbonate
urea
utilization

Opis:

The results of the precipitation of calcium carbonate from a waste post-distillation liquid (DS) and a sodium bicarbonate saturated solution – both from the Solvay method – in the presence of urea are presented. The investigation was carried out at 293 K and 343 K. Reagent dosage times of 1, 5, 10, 20 and 30 min, and urea concentrations of 5, 6 and 10 mol/dm³ were applied. The granulometric composition, the values of bulk and packing densities and the absorptiveness sorption of water and paraffin oil from the obtained calcium carbonate were investigated.

Źródło:

Polish Journal of Chemical Technology; 2014, 16, 2; 95-98
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 66.

Tytuł:

Role of dissolved mineral species in quartz flotation and siderite solubility simulation

Autorzy:

Luo, X.
Wang, Y.
Ma, M.
Song, S.
Zhang, Y.
Deng, J.
Liu, J.

Powiązania:

https://bibliotekanauki.pl/articles/109459.pdf

Data publikacji:

2017

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

quartz
solubility
siderite
calcium ion
temperature
flotation

Opis:

Quartz is, in most cases, the major gangue mineral found in the iron ores. Although it can be activated by calcium at strong alkaline pH, quartz nevertheless, reports to the concentrate with Fe when the iron ores contain siderite. It causes a poor concentrate grade and separation between quartz and iron minerals. The effect of siderite on reverse anionic flotation of quartz from hematite was studied in our previous investigations. In this work, the effect of siderite dissolution on the quartz recovery in the froth product and the effect of pH, ions and temperature on siderite dissolution were investigated. Microflotation, PHREEQC simulation, solution chemistry calculation and Fourier transform infrared spectroscopy (FTIR) measurements were conducted. It was observed that the dissolved species of siderite exhibited negative impact on quartz flotation. This influence became weak to some extent by either stripping the dissolved species or shortening dissolution time. Siderite was easily dissolved in the presence of calcium ion under strong alkaline conditions and its solubility increased with increasing the calcium ion concentrate and temperature. When the calcium ion was added as an activator of quartz under strong alkaline conditions (pH>9.96), calcium existed mainly in the CaCO3 precipitation form according to the solubility rule in the presence of siderite. This form could adsorb onto quartz surfaces and further the chemical reaction between starch and quartz was monitored by FTIR measurements. This study provides a further supplement for previous study. A potential strategy is suggested that finding a collector used at low temperature or flotation under neutral (or weak alkaline) medium is helpful to the reverse flotation of iron ores containing siderite.

Źródło:

Physicochemical Problems of Mineral Processing; 2017, 53, 2; 1241-1254
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 67.

Tytuł:

Adsorption behavior of calcium ions and its effect on cassiterite flotation

Autorzy:

Chen, Yumeng
Feng, Dongxia
Tong, Xiong

Powiązania:

https://bibliotekanauki.pl/articles/110731.pdf

Data publikacji:

2019

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

cassiterite
calcium ions
adsorption
flotation
salicylhydroxamic acid

Opis:

Naturally, most of the cassiterite co-exists with sparingly soluble calcite, which makes it difficult to be fully utilized. Due to the adsorption of calcium ions dissolved from calcite, surface properties of cassiterite and its floatability can be influenced. Adsorption tests show calcium ions can adsorb on cassiterite surface. In the presence of Ca2+, the zeta potentials of cassiterite shift to more positive values and the isoelectric point of cassiterite increases from pH 4.4 to pH 4.9. XPS results show that after calcium ions treatment, a strong calcium spectral peak at 347.65 eV is detected on the cassiterite surface and the chemical circumstance of oxygen atoms is changed. The presence of Ca2+ can significantly depressed the flotation behavior of cassiterite with salicylhydroxamic acid (SHA) as collector. Its recovery is decreased by 26.03% compared to that without Ca2+ at SHA dosage of 8.0×10-4 mol/dm3. When increasing SHA concentration to 9.0×10-4 mol/dm3 and above, the depression effect is partly compensated and the recovery rises by about 20%. Contact angle values of cassiterite measured by the bubble method correspond well to the flotation performance. Hence the depression mechanism of Ca2+ in cassiterite flotation can be interpreted in two aspects: 1) the consumption of SHA due to complexation reactions in pulp; 2) a decrease of effective adsorption site for SHA on cassiterite because of the adsorption of Ca2+.

Źródło:

Physicochemical Problems of Mineral Processing; 2019, 55, 1; 258-267
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 68.

Tytuł:

Hydrogeological Assessment of the Mineral Composition of the Bottled Waters Available For Sale in Poland

Autorzy:

Porowska, Dorota

Powiązania:

https://bibliotekanauki.pl/articles/124939.pdf

Data publikacji:

2020

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

mineral composition
bottled waters
calcium
magnesium
fluorides

Opis:

The choice of bottled waters available for sale is large. The assessment of their mineral composition was based on the results of 120 natural waters and 46 mineral waters (in relation to the hydrogeological classification of water mineralization). Significant diversity was found in terms of the basic mineral composition, and in many cases also a wealth of microcompounds (e.g. fluorides, iodine, selenium), which have a positive effect on the human health. Both the deficiency and excess of the water consumed and the amount of contained ingredients have an influence on the human health. While choosing water, it is worth considering the volume of water consumed, the age and health of the consumer, season of year, activity, type of diet, taken dietary supplements, vitamins and medicines. The information on the label is sufficient to choose the water suited to the individual needs. The waters with high mineralization and/or with large concentrations of microcompounds should be used after medical consultations to determine their use: specify the area of application and recommended drinking amount and frequency.

Źródło:

Journal of Ecological Engineering; 2020, 21, 4; 103-111
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 69.

Tytuł:

Clinical arterial infusion of calcium gluconate: The preferred method for treating hydrofluoric acid burns of distal human limbs

Autorzy:

Zhang, Yuanhai
Ni, Liangfang
Wang, Xingang
Jiang, Ruiming
Liu, Liping
Ye, Chunjiang
Xia, Wenhao
Han, Chunmao

Powiązania:

https://bibliotekanauki.pl/articles/2178799.pdf

Data publikacji:

2014-01-01

Wydawca:

Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi

Tematy:

Hydrofluoric Acid
burn
calcium gluconate
arterial infusion

Opis:

Objective: This study was designed to evaluate the efficiency and safety of arterial infusions of calcium gluconate to treat hydrofluoric (HF) acid burns of the distal human limbs. Materials and Methods: Eligible patients with HF burn limbs, collected from January 2008 to October 2011, were given the arterial infusion of calcium gluconate into the injured limbs. The measures of pain were conducted before the infusion, immediately after the infusion, 4 h after the infusion, and 2 days after the infusion by the visual analogy score (VAS). If the VAS score was higher than 4.0 at the time point 4 h after the first infusion, the infusion was repeated. The time of wound healing, and the number and ratio of the cases receiving the surgical operation were also evaluated. Results: A total of 118 patients, male (107 cases) and female (11 cases), were collected, including 64 cases of outpatients and 54 cases of inpatients. The age of the subjects ranged from 16 to 60 years, with the mean age of 37.6. The burn sites were located in the lateral limbs (28 cases) and in the unilateral limbs (90 cases). For 107 cases, the pain scores decreased quickly after the first infusion. The other 11 cases, with the VAS score higher than 4.0 at the time point 4 h after the first infusion, received the second infusion. The average time of wound healing and the ratio of the cases receiving the surgical operation were closely related to the interval from the injury to the reception of infusion. Conclusions: Arterial infusion of calcium gluconate, effectively relieving the pain, blocking wound progressive deepening, and causing no adverse effects, could be the preferential method to treat hydrofluoric acid burns of the distal human limbs.

Źródło:

International Journal of Occupational Medicine and Environmental Health; 2014, 27, 1; 104-113
1232-1087
1896-494X

Pojawia się w:

International Journal of Occupational Medicine and Environmental Health

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 70.

Tytuł:

Efficiency of CaCl2 spray at different fruit development stages on the fruit mineral nutrient accumulation in cv. Hayward kiwifruit

Autorzy:

Shiri, M.A.
Ghasemnezhad, M.
Moghadam, J.F.
Ebrahimi, R.

Powiązania:

https://bibliotekanauki.pl/articles/15935.pdf

Data publikacji:

2016

Wydawca:

Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza

Tematy:

Actinidia deliciosa
fruit
development stage
mineral nutrient
nutrient accumulation
Hayward cultivar
kiwi fruit
calcium absorption
calcium chloride spray

Opis:

Despite the importance of calcium in many fruit species and the effects of calcium application, there is little or no reliable information on the effect of CaCl2 spray at different fruit development stages on the fruit mineral nutrient content during the growing season and at harvest. Therefore, this study has been conducted to evaluate the effect of calcium chloride (CaCl2, 15 g L-1) spray at different fruit development stages on the accumulation Ca and other macronutrients in cv. Hayward kiwifruit grown at two locations. In order to find the absorbality of Ca at different spraying times, fruits were harvested 7 days after a Ca treatment. Additionally, the mineral composition of kwifruit was determined at the stage of harvest ripeness. The results showed that the absorbality of Ca by kiwifruit from Ca spray decreased significantly with the progressing fruit development. The highest fruit Ca content was found when the fruit plants were sprayed at 35+80 DAFB and 35+80+120 DAFB, irrespectively of the location of an orchard. At a later Ca spraying application, the N content in kiwifruit significantly decreased, but the K and Mg content slightly increased. In contrast, the K/Ca, N/Ca, Mg/Ca and (K+Mg)/Ca ratios of CaCl2 sprayed fruits was lower than in the control and the ratio values were more balanced in the Ca treated fruit than in the control. Overall, three CaCl2 (15 g L-1) sprays could effectively improve the fruit quality by balancing the Ca ratio to other macronutrients. Therefore, Ca spray treatments could be a recommended treatment in growing cv. Hayward kiwifruit.

Źródło:

Journal of Elementology; 2016, 21, 1
1644-2296

Pojawia się w:

Journal of Elementology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 71.

Tytuł:

Sorption of Sr-85 and Am-241 from liquid radioactive wastes by alginate beads

Autorzy:

Oszczak, A.
Fuks, L.

Powiązania:

https://bibliotekanauki.pl/articles/147934.pdf

Data publikacji:

2015

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

sorption
radionuclides
calcium alginate
barium alginate
strontium alginate

Opis:

The paper reports the adsorption of strontium(II) and americium(III) from aqueous solutions onto calcium alginate (CaA), barium alginate (BaA) and strontium alginate (SrA) beads. Adsorption process was studied in batch experiments as a function of the initial pH of the solution and the contact time. All sorbents were examined by the termogravimetric analysis (TG). Laboratory obtained spherical beads of CaA, BaA and SrA seem to be good metal sorbents from liquid radioactive wastes. A contact time of about 4 h and neutral pH of the initial aqueous solution have been proposed to be optimum conditions for Sr-85 and Am-241 removal from the contaminated solutions using alginate sorbents. Laboratory obtained beads of CaA, BaA and SrA are characterized by the decontamination factor (DF) equal to 85% for Sr(II) and 90% for Am(III).

Źródło:

Nukleonika; 2015, 60, No. 4, part 2; 927-931
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 72.

Tytuł:

The content of the forms of calcium and sulphur in the spoil tip of initial soil in the Sulphur Mine "Machów" after many years of its agricultural and forestry land use
Zawartość form wapnia i siarki w gruntach zwałowiska Kopalni Siarki „Machów” po wieloletnim okresie ich zagospodarowania rolniczego i leśnego

Autorzy:

Kowalik, S.
Wójcik, J.

Powiązania:

https://bibliotekanauki.pl/articles/385450.pdf

Data publikacji:

2012

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH

Tematy:

zwałowisko
rekultywacja
wapń
siarka
heap
reclamation
calcium
sulphur

Opis:

This paper contains the results of the studies on the formation of the content of selected forms of calcium and sulphur in the grounds of the rubble heap "Machów" managed by forestry and agriculturally managed, after about 30 years of reclamation measures. Before the reclamation the grounds forming the outer rubble heap of the Sulphur Mine "Machów" were characterized by high content of calcium and sulphur – components of antagonist properties in terms of soil chemical properties, especially the reaction. Thirty years of management as forest or agricultural land caused a significant decrease in the content of different forms of calcium and sulphur only near the surface, in the case of agricultural management up to 20 cm, depth and forest management – 30 cm. The content of calcium, especially CaCO3, despite a small decrease compared to the initial state, is still in the class of optimal contents, due to the structure-forming and reaction stabilizing impact and the degree of sorption complex saturation with alkalis. Despite still a high content of sulphur, also in the surface horizon, molar concentration of calcium in the ground is many times higher, which, in a long time perspective, guarantees the stability of reaction and other chemical properties.
Praca zawiera wyniki badań nad kształtowaniem się wybranych form wapnia i siarki w gruntach zwałowiska "Machów" zalesionych i zagospodarowanych rolniczo po około 30 latach od wykonania na nich zabiegów rekultywacyjnych. Grunty budujące zwałowisko zewnętrzne Kopalni Siarki "Machów" przed rozpoczęciem jego rekultywacji charakteryzowały się wysoką zawartością wapnia i siarki - składników o antagonistycznym oddziaływaniu na właściwości chemiczne gleby, zwłaszcza zaś jej odczyn. Trzydziestoletni okres zagospodarowania leśnego i rolnego spowodował znaczące zmniejszenie zawartości różnych form wapnia i siarki tylko w warstwach przypowierzchniowych, w przypadku zagospodarowania rolniczego do głębokości 20 cm, a leśnego – 30 cm. Zawartość wapnia, w tym zwłaszcza CaCO3, mimo niewielkiego obniżenia się w stosunku do stanu wyjściowego, w dalszym ciągu kształtuje się na poziomie zawartości optymalnych ze względu na oddziaływanie strukturotwórcze oraz stabilizujące odczyn i stopień wysycenia zasadami kompleksu sorpcyjnego. Mimo w dalszym ciągu wysokiej zawartości siarki, także w warstwach powierzchniowych, molowa zawartość wapnia w gruncie jest wielokrotnie wyższa, co gwarantuje stabilność odczynu i innych właściwości chemicznych w długiej perspektywie czasowej.

Źródło:

Geomatics and Environmental Engineering; 2012, 6, 2; 59-69
1898-1135

Pojawia się w:

Geomatics and Environmental Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 73.

Tytuł:

Conformational destabilization of Bacillus licheniformis α-amylase induced by lysine modification and calcium depletion

Autorzy:

Tan, Cheau
Rahman, Raja
Kadir, Habsah
Tayyab, Saad

Powiązania:

https://bibliotekanauki.pl/articles/1039896.pdf

Data publikacji:

2011

Wydawca:

Polskie Towarzystwo Biochemiczne

Tematy:

salt bridges
urea
BLA
calcium
lysine
stability
conformation

Opis:

Bacillus licheniformis α-amylase (BLA) was chemically modified using 100-fold molar excess of succinic anhydride over protein or 0.66 M potassium cyanate to obtain 42 % succinylated and 81 % carbamylated BLAs. Size and charge homogeneity of modified preparations was established by Sephacryl S-200 HR gel chromatography and polyacrylamide gel electrophoresis. Conformational alteration in these preparations was evident by the larger Stokes radii (3.40 nm for carbamylated and 3.34 nm for succinylated BLAs) compared to 2.43 nm obtained for native BLA. Urea denaturation results using mean residue ellipticity (MRE) as a probe also showed conformational destabilization based on the early start of transition as well as ΔGDH2O values obtained for both modified derivatives and Ca-depleted BLA. Decrease in ΔGDH2O value from 5,930 cal/mol (for native BLA) to 3,957 cal/mol (for succinylated BLA), 3,336 cal/mol (for carbamylated BLA) and 3,430 cal/mol for Ca-depleted BLA suggested reduced conformational stability upon modification of amino groups of BLA or depletion of calcium. Since both succinylation and carbamylation reactions abolish the positive charge on amino groups (both α- and ε- amino), the decrease in conformational stability can be ascribed to the disruption of salt bridges present in the protein which might have released the intrinsic calcium from its binding site.

Źródło:

Acta Biochimica Polonica; 2011, 58, 3; 405-412
0001-527X

Pojawia się w:

Acta Biochimica Polonica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 74.

Tytuł:

Immobilizacja katalazy z aspergillus niger w żelu alginianu wapnia
Immobilization of catalase from aspergillus niger in calcium alginate gel

Autorzy:

Miłek, J.
Kwiatkowska-Marks, S.
Wójcik, M.

Powiązania:

https://bibliotekanauki.pl/articles/1207663.pdf

Data publikacji:

2011

Wydawca:

Stowarzyszenie Inżynierów i Techników Przemysłu Chemicznego. Zakład Wydawniczy CHEMPRESS-SITPChem

Tematy:

katalaza
immobilizacja
alginian wapnia
catalase
immobilization
calcium alginate

Opis:

Badano proces pułapkowania katalazy z Aspergillus niger w żelu 2 % i 4 % mas. alginianu wapnia. W przypadku użycia żelu 2% zaobserwowano stopniowy spadek aktywności biokatalizatora, związany z uwalnianiem się katalazy z porów żelu. Stosując 4% żel alginianu wapnia uzyskano stabilny biokatalizator z maksymalną aktywnością w temperaturze 40^(o)C i przy pH 7. Stwierdzono przydatność immobilizowanego biokatalizatora do wielokrotnego użycia przy rozkładzie H2 O2 w reaktorze okresowym.
The entrapment of catalase from Aspergillus niger in a gel containing 2% and 4% by weight of calcium alginate was investigated. For the 2% gel, the biocatalyst was observed to gradually lose its activity as catalase was released from the gel pores. A stable biocatalyst with a maximum activity at 40^(o)C and pH 7 was obtained using the gel containing 4% calcium alginate. The immobilized biocatalyst was found to be useful in repeated applications for decomposing H2 O2 in a batch reactor.

Źródło:

Chemik; 2011, 65, 4; 305-308
0009-2886

Pojawia się w:

Chemik

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 75.

Tytuł:

Effect of medium purity on submerged citric acid fermentation yield (with particular emphasis on mineral salts content)
Badania nad wpływem czystości podłoża, a zwłaszcza soli mineralnych na cytrynową fermentację wgłębną

Autorzy:

Kutermankiewicz, M.
Leśniak, W.

Powiązania:

https://bibliotekanauki.pl/articles/1399534.pdf

Data publikacji:

1989

Wydawca:

Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie

Tematy:

citric acid fermentation
mineral content
potassium
sodium
calcium

Opis:

The effect of medium purity on submerged citric acid fermentation was studied. It was found that total acidity and con equently, acid fermentation yield decreases with the increase of ash concentration in the medium. Of all the main ingredient of molasses minerals (potassium, sodium, calcium), calcium ions are the one inhibiting citric acid fermentation most.
Badano korelacje występujące pomiędzy czystością podłoża a efektywnością wgłębnej fermentacji cytrynowej. Badania prowadzono w skali laboratoryjnej w fermentorach o pojemności 10 dm³ przy użyciu wybranych szczepów A. niger. Jako główny substrat stosowano melasę buraczaną i cukrowniczy sok gęsty oraz ich mieszaniny. Stwierdzono, że wraz ze zmniejszeniem się czystości podłoża maleje wydajność fermentacji cytrynowej (rys. 1). Głównym powodem zmniejszenia się wydajności na tych podłożach była większa zawartość soli mineralnych. Zostało to potwierdzone w próbach fermentacyjnych z rosnącym dodatkiem popiołu melasowego (rys. 2). Spośród głównych składników popiołu: potasu, sodu i wapnia nie stwierdzono ujemnego wpływu nawet dużych ilości, jakie występują w melasie potasu (rys. 3). Sód w ilościach ponad 300 mg/dm³ wpływał już wyraźnie ujemnie (rys. 4) podobnie jak wapń (rys. 5), który był największym inhibitorem fermentacji. Ujemny wpływ wapnia został potwierdzony w próbach fermentacyjnych z dodatkiem popiołu melasowego, z którego usunięto jony wapnia (rys. 6) oraz w próbach fermentacyjnych prowadzonych na melasach pochodzących z różnych cukrowni, a różniących się zdecydowanie zawartością wapnia (tab. 2), w których najwyższe wydajności uzyskano w próbach zawierających najmniejsze ilości wapnia.

Źródło:

Acta Alimentaria Polonica; 1989, 15(39), 1; 97-105
0137-1495

Pojawia się w:

Acta Alimentaria Polonica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 76.

Tytuł:

Wpływ obecności nanododatków na strukturę i właściwości włókien z alginianu wapnia
Effect of the presence of nanoadditives on the structure and properties of calcium alginate fibres

Autorzy:

Boguń, M.
Mikołajczyk, T.
Rabiej, S.
Stodolak, E.

Powiązania:

https://bibliotekanauki.pl/articles/285389.pdf

Data publikacji:

2009

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

nanododatki
włókna
alginian wapnia
nanoadditives
fibres
calcium alginate

Źródło:

Engineering of Biomaterials; 2009, 12, no. 89-91; 189-193
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 77.

Tytuł:

An ultrasonic method for estimation of elastic properties of R-bone cement after immersion in Ringers solution

Autorzy:

Rajzer, I.
Piekarczyk, J.
Castano, O.
Engel, E.
Planell, J. A.

Powiązania:

https://bibliotekanauki.pl/articles/285794.pdf

Data publikacji:

2008

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

calcium phosphate cement
elastic properties
injectability
ultrasonic method

Opis:

The aim of this investigation is to establish an improved non-destructive ultrasonic through-transmission technique to monitor the setting behaviour of calcium phosphate cement samples. On the basis of ultrasound techniques the elastic properties of cement paste after different soaking time in Ringer's solution were measured. Young's modulus, the rigidity modulus, and Poisson's ratio were calculated from measurements of density and ultrasonic longitudinal and shear wave velocities.

Źródło:

Engineering of Biomaterials; 2008, 11, no. 81-84; 113-116
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 78.

Tytuł:

Regulation of gastric mucosal calcium channel activity by an antiulcer agent, ebrotidine

Autorzy:

Slomiany, B L
Liu, J.
Piotrowski, J.
Czajkowski, A.
Yotsumoto, F.
Slomiany, A.

Powiązania:

https://bibliotekanauki.pl/articles/70407.pdf

Data publikacji:

1994

Wydawca:

Polskie Towarzystwo Fizjologiczne

Tematy:

calcium channel
regulation
gastric mucosa
antiulcer agent
ebrotidine

Źródło:

Journal of Physiology and Pharmacology; 1994, 45, 1
0867-5910

Pojawia się w:

Journal of Physiology and Pharmacology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 79.

Tytuł:

Correlations among plasma silicon, magnesium and calcium in patients with knee osteoarthritis - analysis in consideration of gender

Autorzy:

Musik, I.
Kurzepa, J.
Luchowska-Kocot, D.
Kocot, J.
Paździor, M.
Polz-Dacewicz, M.
Kiełczykowska, M.

Powiązania:

https://bibliotekanauki.pl/articles/2082056.pdf

Data publikacji:

2018

Wydawca:

Instytut Medycyny Wsi

Tematy:

osteoarthritis of knee
silicon
calcium
magnesium
males
females

Opis:

Introduction and objective. Osteoarthrits (OA) is a complex, chronic disorder of cartilage and bone, related to homeostasis of bioelements. The current study aimed at evaluation of correlations between plasma silicon, magnesium and ionized calcium in OA patients in consideration to gender. Materials and method. The study comprised 59 patients aged 69.5±9.0 years (18 males aged 66.8±9.2; 41 females aged 70.7±8.8), admitted to the Trauma and Orthopaedic Ward of the Independent Public Health Care Centre in Łęczna, Poland, due to OA and qualified to surgery. Control group consisted of 19 subjects without OA (54.5±8.6 years; 10 males aged 41.3±9.3; 9 females aged 69.1±14.9). Plasma concentrations of silicon and magnesium (spectrophotometric methods) and ionized calcium (potentiometric method) were determined. Results. Silicon in OA patients was significantly increased vs. control. In OA males and OA females, silicon was enhanced vs. the respective controls, but it was statistically significant only in males. Magnesium in OA patients was not significantly different from control group. In females, a significant decrease vs. the respective control was observed. No significant differences were observed in the case of ionized calcium. Positive correlations between silicon and magnesium in healthy control, both in the whole group and in male and female subgroups, were noted, while no such effect was observed in OA subjects. Conclusions. The results might suggest some connection between higher OA incidence in women and the depleted magnesium in the organism. Silicon increase in OA patients, especially in men, may indicate its intense metabolism during the articular inflammatory process, likely dependent on sex hormones. It remains open whether the plasma Si increase is the effect or cause of OA.

Źródło:

Annals of Agricultural and Environmental Medicine; 2019, 26, 1; 97-102
1232-1966

Pojawia się w:

Annals of Agricultural and Environmental Medicine

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 80.

Tytuł:

The effect of fructan-enriched diet on bone turnover parameters in ovariectomized rats under calcium restriction

Autorzy:

Topolska, K.
Bieńko, M.
Filipiak-Florkiewicz, A.
Radzki, R.P.
Cieślik, E.

Powiązania:

https://bibliotekanauki.pl/articles/2085720.pdf

Data publikacji:

2020

Wydawca:

Instytut Medycyny Wsi

Tematy:

fructans
calcium dietary restriction
bone turnover
densitometry
ovariectomy

Opis:

Introduction. Osteoporosis, the “quiet epidemic”, is one of the most serious threats to public health. It is known that estrogen plays a significant role in the regulation of bone turnover, and its loss at menopause causes osteoporosis. Added to this, insufficient calcium intake accelerates bone mass loss, increasing the risk of fractures. Objective. The study aimed to answer the question whether a fructan-enriched diet could be helpful in preventing from disturbances in bone turnover caused by calcium restriction combined with ovariectomy-induced estrogen deficiency. The differences related to the kind of fructan and “matrix effect” of fructan action (form of addition) were also evaluated. Materials and method. The study was conducted using sham-operated (control groups) or ovariectomized (OVX) rats fed a calcium restricted diet. The treatment diets contained one of three fructan sources – Jerusalem artichoke, yacon and Beneo Orafti Synergy1 – added alone or as an ingredient of strawberry sorbet, all in the amount providing 8% fructans. Analyses of biological material included: serum Ca, Mg and P concentrations, alkaline phosphatase activity (ALP), osteocalcin (OC) and C-telopeptide degradation products from type I collagen (CTX). Densitometric parameters of femora were also assayed. Results. Among markers of bone turnover, the ALP activity depended both on the kind of fructan and the form of addition. The highest value was shown in the OVX group fed a low-calcium diet, whereas administration of diet enriched with Jerusalem artichoke led to an almost 50% decrease in the value of this parameter. Dietary fructans also lowered the OC level. Feeding rats with diet containing sorbet enriched in yacon or Jerusalem artichoke resulted in a decrease of CTX, compared to the diet containing yacon alone or fructan formulation in both forms No significant differences were observed in densitometric parameters between treatment groups. Conclusions. The obtained findings suggest that fructan administration with a calcium-restricted diet might exert a positive effect on bone turnover parameters. Regarding the form of their addition, it is possible that other constituents of sorbets contributed to the fructan action. It remains open whether this impact would be significant over a longer period of time.

Źródło:

Annals of Agricultural and Environmental Medicine; 2020, 27, 2; 219-224
1232-1966

Pojawia się w:

Annals of Agricultural and Environmental Medicine

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 81.

Tytuł:

The depression mechanism on pyrite in a low-alkaline system with combined depressants : Experiment, HSC, DFT and ToF–SIMS studies

Autorzy:

Li, Suqi
Yuan, Jiaqiao
Ding, Zhan
Li, Jie
Yu, Anmei
Wen, Shuming
Bai, Shaojun

Powiązania:

https://bibliotekanauki.pl/articles/24085821.pdf

Data publikacji:

2023

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

pyrite
calcium hypochlorite
lime
depression
low alkaline system

Opis:

Depression of pyrite in a low-alkaline system has sparked soaring interests for the multi-metal sulfide minerals flotation recently. This study investigates effects of combined depressants (Ca(ClO)2 and CaO) on pyrite flotation with butyl xanthate (KBX). Micro-flotation experiments indicate that the addition of 200 mg/L combined depressants (a mass ratios of CaO to Ca(ClO) 2 of 2:3) and 1.0×10−3 mol/L KBX at pH 9.5 can effectively depresses the flotation of pyrite, and a minimum pyrite recovery rate of 12.5% is obtained. Basic thermodynamic evaluation results confirm the participation of Ca(ClO) 2 significantly decrease the negative Gibbs free energies of pyrite oxidation reaction. Besides, the calcium species (Ca(OH) 2, Ca2+ and Ca(Cl) 2) will spontaneously transform into CaCO3,and it is the ultimate dominant calcium species in the CO32- system. Density functional theory (DFT) results indicate that CaCO3 can chemically adsorb onto the pyrite surface with an adsorption energy of –671.13 kJ/mol. The O1 and Ca atoms mainly contribute to the bonding process and are responsible for the stable adsorption of CaCO3. ToF-SIMS results provide strong evidence that the combined depressants increase the amount of hydrophilic species and decrease dixanthogen adsorption onto the pyrite surface. The thickness of the whole formed hydrophilic species is approximately 50 nm. Semiquantitative amounts of hydrophilic species follow the order of hydroxy calcium>iron carbonyl>calcium carbonate. Overall, hydrophilic species repulse adsorption of dixanthogen and significantly reduce the flotation performance of pyrite.

Źródło:

Physicochemical Problems of Mineral Processing; 2023, 59, 3; art. no. 168454
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 82.

Tytuł:

Possibility of using a mixture of calcium salts to decrease sulphate concentration and total mineralisation of surface and mine waters
Możliwość zastosowania mieszanki soli wapnia w celu zmniejszenia stężenia siarczanów oraz ogólnej mineralizacji wód powierzchniowych i kopalnianych

Autorzy:

Trach, Y.
Trach, R.

Powiązania:

https://bibliotekanauki.pl/articles/28765727.pdf

Data publikacji:

2022

Wydawca:

Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie

Tematy:

limestone
surface water
mine water
mineralization
sulphate
sulphate concentration
calcium salt
sulphate ion
calcium acetate
pollutant removal
laboratory research

Źródło:

Acta Scientiarum Polonorum. Architectura; 2022, 21, 4; 63-68
1644-0633

Pojawia się w:

Acta Scientiarum Polonorum. Architectura

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 83.

Tytuł:

Is MLC phosphorylation essential for the recovery from ROCK inhibition in glioma C6 cells?

Autorzy:

Korczyński, Jarosław
Sobierajska, Katarzyna
Krzemiński, Patryk
Wasik, Anna
Wypych, Dorota
Pomorski, Paweł
Kłopocka, Wanda

Powiązania:

https://bibliotekanauki.pl/articles/1039964.pdf

Data publikacji:

2011

Wydawca:

Polskie Towarzystwo Biochemiczne

Tematy:

RhoA
myosin II
calcium signaling
actin
MLC phosphorylation

Opis:

Inhibition of Rho-associated protein kinase (ROCK) activity in glioma C6 cells induces changes in actin cytoskeleton organization and cell morphology similar to those observed in other types of cells with inhibited RhoA/ROCK signaling pathway. We show that phosphorylation of myosin light chains (MLC) induced by P2Y2 receptor stimulation in cells with blocked ROCK correlates in time with actin cytoskeleton reorganization, F-actin redistribution and stress fibers assembly followed by recovery of normal cell morphology. Presented results indicate that myosin light-chain kinase (MLCK) is responsible for the observed phosphorylation of MLC. We also found that the changes induced by P2Y2 stimulation in actin cytoskeleton dynamics and morphology of cells with inhibited ROCK, but not in the level of phosphorylated MLC, depend on the presence of calcium in the cell environment.

Źródło:

Acta Biochimica Polonica; 2011, 58, 1; 125-130
0001-527X

Pojawia się w:

Acta Biochimica Polonica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 84.

Tytuł:

Environmental parameters conditioning microbially induced mineralization under the experimental model conditions

Autorzy:

Otlewska, Anna
Gutarowska, Beata

Powiązania:

https://bibliotekanauki.pl/articles/1038825.pdf

Data publikacji:

2016

Wydawca:

Polskie Towarzystwo Biochemiczne

Tematy:

microbially induced mineralization
calcium carbonate
abiotic factors
urease

Opis:

Microbially induced calcium carbonate precipitation is one of the biomineralization types closely dependent on the parameters of the microenvironment. Minerals are precipitated as a product of environmental and bacterial cell interactions, however, this system has very little control via microorganisms. The aim of research was to determine the influence of abiotic factors (pH, temperature, agitation speed of bacterial culture and calcium ion source) on the mineralization induced by Arthrobacter sulfureus, Bacillus muralis and B. atrophaeus strains under the standard laboratory conditions. Because of the key role of urease in biomineralization, processes occurring in environments with and without the urea were compared. For this purpose, cultivation of bacteria (A. sulfureus, B. muralis and B. atrophaeus) was carried out in B4 liquid medium for 5 days with various environmental parameters (pH 6-9; temperature 25-44°C; speed of agitation 0-180 rpm, different calcium sources). It was noticed that the pH and the speed of agitation clearly affect the amount of the calcium carbonate that formed. Our observations suggest that the highest precipitation rate takes place in alkaline pH between 8-9, with shaking at 180 rpms. Among studied sources of calcium ions (calcium acetate, calcium chloride and calcium nitrate), calcium acetate demonstrated the strongest potential in the biomineralization process. Moreover, work presented here demonstrates that the correlation between cultivation temperature and biomineralization process cannot be clearly evaluated. The morphology and size of calcium carbonate minerals was strain-specific, although affected by the presence of urea in the surrounding solution.

Źródło:

Acta Biochimica Polonica; 2016, 63, 2; 343-351
0001-527X

Pojawia się w:

Acta Biochimica Polonica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 85.

Tytuł:

Zastosowanie fosforanów wapnia w stomatologii
The applications of calcium phosphates in dentistry

Autorzy:

Kula, Z.
Laska, A.
Szymanowski, H.

Powiązania:

https://bibliotekanauki.pl/articles/285037.pdf

Data publikacji:

2014

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

hydroksyapatyt
fosforany wapnia
szkliwo
hydroxyapatite
calcium phosphates
enamel

Opis:

Fosforany wapnia zaliczane są do biomateriałów ceramicznych, resorbowalnych. Kości i zęby kręgowców zbudowane są z fosforanu wapnia, głównie z hydroksyapatytu. Zajmuje on szczególne miejsce pośród fosforanów wapnia, ze względu na wyjątkowe właściwości fizykochemiczne i biologiczne. Zarówno hydroksyapatyt (HAp), jak i ortofosforan (V) wapnia (TCP) są solami trójzasadowego kwasu ortofosforowego – H3PO4 . Dzięki właściwościom użytkowym znalazły szerokie zastosowanie w medycynie i stomatologii. Amorficzny fosforan wapnia dodawany jest do preparatów wybielających, stosowanych do metody nakładkowej oraz metody z wykorzystaniem lampy UV. Badania kliniczne dowodzą, że amorficzny fosforan wapnia (ACP) ma następujące właściwości: odbudowuje szkliwo poprzez wytworzenie nowej powłoki hydroksyapatytowej na powierzchni zębów, zmniejsza nadwrażliwość zębów, przywraca zębom połysk i wygładza ich powierzchnię oraz zmniejsza ryzyko nawrotu przebarwień.
Calcium phosphates are among the ceramic biomaterials, resorbable. Bones and teeth of vertebrates are composed of calcium phosphate, mainly hydroxyapatite, which occupies a special place among the calcium phosphates, due to the unique physical, chemical and biological properties. Both the hydroxyapatite (HAp), as well as orthophosphate (V) phosphate (TCP) are salts of tribasic phosphoric acid - H3PO4. Excellent utility properties found wide application in medicine and dentistry. The amorphous calcium phosphate is added to the bleaching preparations used for the overlay method and the method using a UV lamp. Clinical studies show that the amorphous calcium phosphate (ACP) has the following characteristics: recovering, by creating a new enamel hydroxyapatite coating on the surface of the teeth, reduce hypersensitivity of the teeth, the teeth restores the gloss and smooth the surface and reduce the risk of recurrence of discoloration.

Źródło:

Engineering of Biomaterials; 2014, 17, no. 128-129; 54-56
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 86.

Tytuł:

Drug-loaded mesoporous silica/calcium phosphate composites for bone regeneration

Autorzy:

Szewczyk, Adrian
Skwira, Adrianna
Prokopowicz, Magdalena

Powiązania:

https://bibliotekanauki.pl/articles/285874.pdf

Data publikacji:

2019

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

mesoporous silica
calcium phosphate
hydroxyapatite
composites
drug delivery

Opis:

In this work, we obtained a mesoporous silica-calcium phosphate composite (MSi-CaP) in the form of spherical granules (pellets) loaded with cefazolin as a model antibiotic. First, the MSi-CaP composite was manufactured in the powder form via the sol-gel method using a soft template. The cefazolin was loaded into the MSi-CaP using the immersion method. The pellets were composed of MSi-CaP powders (both placebo and cefazolin-loaded) and excipients, such as microcrystalline cellulose and ethyl cellulose. The pellets were obtained in the laboratory scale using the wet-granulation, extrusion and spheronization method. The pellets proved satisfactory mechanical properties which allowed for further investigations (the drug release studies and the mineralization potential assay) without a risk of pellets cracking. The complete drug release from the pellets was observed after 12 h. The burst release of cefazolin from the pellets was reduced by 3 when compared to the burst release of cefazolin-loaded MSi-CaP powders (90 and 30% after 15 min of release studies, respectively). The pellets showed the mineralization potential in vitro, confirmed by the SEM-EDX and FTIR methods. After 60 days of the mineralization potential assay in the simulated body fluid, the examinations revealed that the whole surface of pellets was covered with the carbonated hydroxyapatite in accordance with the desired morphology.

Źródło:

Engineering of Biomaterials; 2019, 22, 150; 16-21
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 87.

Tytuł:

Włókna z alginianu wapnia zawierające nanohydroksyapatyt
Calcium alginate fibres containing nanohydroxyapatite

Autorzy:

Boguń, M.
Stodolak, E.

Powiązania:

https://bibliotekanauki.pl/articles/284183.pdf

Data publikacji:

2008

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

alginian wapnia
nanotechnologia
nanohydroksyapatyt
calcium alginate
nanotechnology
nanohydroxyapatite

Opis:

Otrzymano włókna alginianowe zawierające w swojej budowie rozproszony bioaktywny nanododatek hydroksyapatytu. Włókna te charakteryzują się wysokimi właściwościami sorpcyjnymi oraz wartością wytrzymałości właściwej powyżej 20cN/tex odpowiednią do przerobu na kompozyty przeznaczone do zastosowań medycznych.
Alginate fibres containing in their structure a dispersed bioactive hydroxyapatite nano-additive were obtained. These fibres are characterized by high sorption properties and a tensile strength of over 20cN/tex, which is adequate for the production of composites designed for medical purposes.

Źródło:

Engineering of Biomaterials; 2008, 11, no. 81-84; 70-72
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 88.

Tytuł:

Calcium ion migration in agricultural and afforested lake catchments
Migracja jonu wapniowego w jeziornych zlewniach rolniczo-leśnych

Autorzy:

Koc, J.
Sidoruk, M.
Rochwerger, A.

Powiązania:

https://bibliotekanauki.pl/articles/388545.pdf

Data publikacji:

2009

Wydawca:

Towarzystwo Chemii i Inżynierii Ekologicznej

Tematy:

jeziora
zlewnia
biogeny
wapń
lakes
catchment
biogenes
calcium

Opis:

The research on circulating of calcium in the agricultural-forest drainage areas were carried out on the Olsztyn lake district in 2004-2006 years. Three lakes were marked out for examinations about diversified anthropogenic interacting with their drainage areas. Ardung lake is situated in the centre-western part of the Mazurian lake district, its surface amounts to 26.2 ha and the average depth is 1.8 m. The drainage area of examined lake bas the surface of 1539 ha and forest communities are covering it in the form of pine forests about the high level of the naturalness. Drainage area of Bukwałd lake is situated 20 km to the north of Olsztyn. Lake covers 36.2 ha of the surface and its average depth is 5.0 m. The total drainage area of lake is taking the surface of 1156 ha, in which the arable land constitutes the 60 % with the little surface area of the land filld by wasteland (9 %) and forests (31 %) and with low-density housing. Lake Sunia is situated about 30 km to the north of Olsztyn. The surface area of lake amounts to 111.6 ha and its average depth is 3.9 m. The total surface of the drainage area amounts to 450 ha, out of which 97 % is going to the intensively agriculturally used lands, while the Test part constitute wastelands and forests. Comparing the individual research years one should state that in 2005 the lowest values of flows were recorded in the rising tides and ebb tides from Lakes Sunia and Bukwałd, however the highest were observed in the year 2004; a situation developed differently in the drainage area of Ardung lake, in which, in the sequence of the entire research period, comparatively levelled values of flows were recorded in all rising tides and the ebb tide of lake. Comparing flows off from the examined drainage areas one should state that the waters running off from the exploited agricultural drainage areas of Bukwałd lake were characterized by the highest Ca2+ contents (114.3-126.3 mg . dm-3), however the lowest were found in waters running off from the boggy area of the same lake (25.0 mg . dm-3). Higher contents of calcium in the waters running off from the agricultural areas is connected with more intensive washing this element out of arable cultivated soils periodically deprived of the plant cover. Considerable de-equalisations occurring in the drainage areas of lakes can also contribute to the faster outflow of biogenes increasing this way their content in the waters flowing into the reservoir.
Badania nad krążeniem wapnia w zlewniach rolniczo-leśnych prowadzono na Pojezierzu Olsztyńskim w latach 2004-2006. Do badań wytypowano trzy jeziora o zróżnicowanym oddziaływaniu antropogennym na ich zlewnie. Jezioro Ardung położone jest w środkowo-zachodniej części Pojezierza Mazurskiego, jego powierzchnia wynosi 26,2 ha, a średnia głębokość 1,8 m. Zlewnia badanego jeziora ma powierzchnię 1539 ha i porastają ją zbiorowiska leśne w postaci borów sosnowych o wysokim stopniu naturalności. Zlewnia jeziora Bukwałd położona jest 20 km na północ od Olsztyna. Jezioro zajmuje 36,2 ha powierzchni, a jego średnia głębokość wynosi 5,0 m. Całkowita zlewnia jeziora zajmuje powierzchnię 1156 ha, w której grunty orne stanowią 60 % z niewielką powierzchnią terenu zajętą przez nieużytki (9 %) oraz lasy (31 %) i rozproszoną zabudową. Jezioro Sunia położone jest ok. 30 km na północ od Olsztyna. Powierzchnia jeziora wynosi 111,6 ha, a jego średnia głębokość 3,9 m. Całkowita powierzchnia zlewni wynosi 450 ha, z czego 97 % przypada na grunty intensywnie użytkowane rolniczo, a pozostałą część stanowią nieużytki oraz zadrzewienia. Porównując poszczególne lata badawcze, należy stwierdzić, że w roku 2005 odnotowano najmniejsze wartości przepływów w dopływach i odpływach z jezior Sunia i Bukwałd, natomiast największe zaobserwowano w roku 2004, odmiennie kształtowała się sytuacja w zlewni jeziora Ardung, w którym w ciągu całego okresu badawczego odnotowano względnie wyrównane wartości przepływów we wszystkich dopływach i odpływie z jeziora. Porównując spływy z badanych zlewni, należy stwierdzić, że największą zawartością Ca2+ odznaczały się wody odpływające ze zlewni użytkowanych rolnie jeziora Bukwałd (114,3-126,3 mg . dm-3), natomiast najniższe stwierdzono w wodach odpływających z obszaru podmokłego tego samego jeziora (25,0 mg. dm-3). Większe zawartości wapnia w wodach odpływających z obszarów rolniczych jest związane z intensywniejszym wymywaniem tego składnika z gleb uprawianych omie okresowo pozbawionych okrywy roślinnej. Znaczne deniwelacje występujące w zlewniach jezior mogą się także przyczyniać do szybszego odpływu biogenów, zwiększając tym samym swoją zawartość w wodach dopływających do zbiornika.

Źródło:

Ecological Chemistry and Engineering. A; 2009, 16, 3; 201-212
1898-6188
2084-4530

Pojawia się w:

Ecological Chemistry and Engineering. A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 89.

Tytuł:

Application of polish calcium sorbents in carbonate looping

Autorzy:

Kotyczka-Moranska, M.
Tomaszewicz, G.

Powiązania:

https://bibliotekanauki.pl/articles/109718.pdf

Data publikacji:

2013

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

calcium looping
CO2 capture
CaO-based sorbents

Opis:

The purpose of this work was the investigation of behaviour of three Polish CaO-based sorbents during calcium looping cycles. All investigations were conducted with a Netzsch STA 409PG Luxx thermogravimetric analyser. Samples weighing ms = 10.0(1) mg were placed in an Al2O3 crucible. The calcium looping processes were performed at two carbonation temperatures (650°C and 680°C) and three calcination temperatures (880°, 900° and 920°C). Additionally, calcination-carbonation cycles with different gas flows were explored. We investigated the influence of CO2 concentration and total gas flow on carbonation conversion.

Źródło:

Physicochemical Problems of Mineral Processing; 2013, 49, 1; 111-120
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 90.

Tytuł:

Application of modified calcium sorbents in carbonate looping

Autorzy:

Kotyczka-Moranska, M.
Tomaszewicz, G.

Powiązania:

https://bibliotekanauki.pl/articles/110469.pdf

Data publikacji:

2014

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

calcium looping
CO2 capture
CaO-based sorbents

Opis:

Reduction of CO2 emission is essential. In this paper, a study of the behaviour of modified Polish CaO-based sorbents during calcium looping cycles has been discussed. All the related tests were conducted using the Netzsch STA 409PG Luxx thermogravimetric analyser. Samples with a weight of ms=10.0±0.1 mg were placed in an Al2O3 crucible. The calcium looping processes were performed at the carbonation temperature of 650°C and the calcination temperature of 900°C. Additionally, calcinationcarbonation cycles with different gas flows were examined. The authors investigated the influence of CO2 concentration and total gas flow on the carbonation conversion. Sorbents were studied by TG and porosimetry analysis.

Źródło:

Physicochemical Problems of Mineral Processing; 2014, 50, 1; 217-224
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 91.

Tytuł:

Perioperative calcium and vitamin D supplementation in patients undergoing thyroidectomy – literature review

Autorzy:

Grzegory, Anna
Pomorski, Lech

Powiązania:

https://bibliotekanauki.pl/articles/1392434.pdf

Data publikacji:

2018

Wydawca:

Index Copernicus International

Tematy:

hypocalcemia
hypoparathyroidism
calcium
vitamin D
thyroidectomy
perioperative period

Opis:

Introduction: Postoperative hypocalcemia is a narrow but significant problem for patients undergoing thyroid and parathyroid surgery. It is the most common complication after thyroidectomy. It is associated with transient or permanent hypoparathyroidism. It could potentially be life-threatening for patients and increases the costs of hospitalization. The aim of the study was to evaluate the results of studies that routinely administrated calcium and/or vitamin D during the postoperative period. Materials and Methods: In this article, a literature review – 15 studies that used routine perioperative calcium (7 studies), vitamin D (2 studies) and calcium with vitamin D (11 studies) supplementation was performed. Supplementation effectiveness in prevention of postoperative hypocalcemia was compared to no prophylaxis in 10 studies. Five studies compared the effect of combined administration (calcium and vitamin D) to calcium alone. The number of papers dealing with this problem is not particularly high. Results: Supplementation significantly decreased the rate of laboratory and symptomatic hypocalcemia. It was also effective in reducing the severity of symptoms. The combination of calcium with vitamin D was the most effective strategy. No hypercalcemia or parathyroid hormone inhibition was observed in the supplemented groups. Routine supplementation was less expensive than performing laboratory tests in the course of treatment of hypocalcemia. Conclusions: The results of analyzed studies showed the clinical and economic advantage of routine perioperative prophylactic supplementation of vitamin D and/or calcium as compared to no prophylaxis. However, the majority of studies showed a significant range of variability in patients’ characteristics. Numerous studies did not evaluate the preoperative 25-hydroxycholecalciferol level – a risk factor for postoperative hypocalcemia. Discussion: The use of routine prophylactic supplementation of calcium and vitamin D in the perioperative period can be useful in everyday clinical practice. Further research is needed to draw clear guidelines regarding prophylactic calcium and vitamin D therapy for patients after thyroidectomy.

Źródło:

Polish Journal of Surgery; 2018, 90, 4; 46-50
0032-373X
2299-2847

Pojawia się w:

Polish Journal of Surgery

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 92.

Tytuł:

W sprawie przechodzenia wapnia z tygli porcelanowych
Concerning the passing of calcium from porcelain crucibles (laboratory note)

Autorzy:

Karkocha, I.
Chojnicka, B.
Hiszpanska, C.

Powiązania:

https://bibliotekanauki.pl/articles/874561.pdf

Data publikacji:

1956

Wydawca:

Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny

Tematy:

wapn
produkty spozywcze
oznaczanie
tygle porcelanowe
badania naukowe
zawartosc wapnia
calcium
food product
determination
porcelain crucible
scientific research
calcium content

Źródło:

Roczniki Państwowego Zakładu Higieny; 1956, 07, 6
0035-7715

Pojawia się w:

Roczniki Państwowego Zakładu Higieny

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 93.

Tytuł:

Wpływ dawek i terminów stosowania węglanu wapnia do odkwaszenia torfu wysokiego na zawartość dostępnych składników pokarmowych dla roślin
The effect of doses and application terms of calcium carbonate for peat moss deacidification on the content of nutrients available for plants

Autorzy:

Bosiacki, M.
Kozik, E.
Mieloszyk, E.

Powiązania:

https://bibliotekanauki.pl/articles/270737.pdf

Data publikacji:

2010

Wydawca:

Centralny Ośrodek Badawczo-Rozwojowy Aparatury Badawczej i Dydaktycznej, COBRABiD

Tematy:

odkwaszenie torfu
węglan wapnia
peat moss deacidification
calcium carbonate

Opis:

Celem przeprowadzonych badań było określenie wpływu dawek i terminów stosowania węglanu wapnia na dostępność dla roślin makro- i mikroskładników. Doświadczenie wazonowe przeprowadzono w warunkach kontrolowanych w układzie całkowicie losowym. Czynnikami doświadczenia były dwa terminy wapnowania torfu wysokiego (I termin - 14 dni przed wprowadzeniem składników pokarmowych, II termin - 14 dni po wprowadzeniu składników pokarmowych), oraz wzrastające dawki węglanu wapnia (12,5,25,50 i 75 g x dm3). Po 28 dniach od założenia doświadczenia wykonano analizy chemiczne podłoża, w celu określenia przyswajalnych form składników pokarmowych. Zabieg wapnowania wykonany czternaście dni przed wprowadzeniem składników pokarmowych do podłoża powoduje istotne zmiany w odczynie podłoża (większe pH) w zawartości azotu amonowego, potasu, magnezu, manganu i żelaza (mniej składników) oraz w zawartości miedzi (więcej Cu) w porównaniu do przeprowadzenia zabiegu wapnowania czternaście dni po dodaniu do podłoża składników pokarmowych.
The aim of the study was to determine the effect of dose and application terms of calcium carbonate on the availability to the plant macro-and micronutrients. A pot experiment was conducted under controlled conditions in a completely randomized design. The experimental factors were two terms of peat moss liming (I term -14 days prior to the introduction of nutrients, II term -14 days after the introduction of nutrients), and increasing doses of calcium carbonate (12.5, 25, 50 and 75 g x dm 3). After 28 days from the experiment assumed the chemical analysis of medium was made, in order to determine the available forms of nutrients. Liming treatment made fourteen days prior to the introduction of nutrients to the medium causes significant changes in pH substrate (higher pH), in the content of ammonium nitrogen, potassium, magnesium, manganese and iron (less elements) and copper (more Cu) compared to liming treatment carried out fourteen days after addition of nutrients to the medium.

Źródło:

Aparatura Badawcza i Dydaktyczna; 2010, 15, 4; 43-49
2392-1765

Pojawia się w:

Aparatura Badawcza i Dydaktyczna

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 94.

Tytuł:

Effect of Rho-associated kinase inhibition on actin cytoskeleton structure and calcium response in glioma C6 cells

Autorzy:

Targos, Berenika
Pomorski, Paweł
Krzemiński, Patryk
Barańska, Jolanta
Rędowicz, Maria
Kłopocka, Wanda

Powiązania:

https://bibliotekanauki.pl/articles/1041182.pdf

Data publikacji:

2006

Wydawca:

Polskie Towarzystwo Biochemiczne

Tematy:

glioma C6
actin cytoskeleton
RhoA
ROCK
calcium transients

Opis:

The role of actin cytoskeleton functional state in glioma C6 cell morphology and calcium signaling was investigated through modification of myosin II activity by blocking Rho-associated kinase with the specific inhibitor Y-27632. Treatment of glioma C6 cells with ROCK inhibitor resulted in actin cytoskeleton reorganization and also in the changed shape and distribution of mitochondria. Changes in the distribution of ER, the main calcium store in glioma C6 cells, were not visible. The inhibition of myosin II activity influences the first phase of calcium signaling evoked by agonist, and both phases of thapsigargin-evoked calcium response. We suggest that the observed increase in Ca2+ release from intracellular stores induced by IP3 formation as well as inhibition of SERCA ATPase is at least in part related to severely affected mitochondria. Enhancement of capacitative calcium entry evoked by thapsigargin is probably associated with the reorganization of the acto-myosin II system. ATP-induced calcium response presents no changes in the second phase. We observed that ATP stimulation of Y-27632 pretreated cells leads to immediate morphological rearrangement of glioma C6 cells. It is a consequence of actin cytoskeleton reorganization: formation of stress fibers and relocation of phosphorylated myosin II to actin filaments. It seems that the agonist-evoked strong calcium signal may be sufficient for myosin II activation and the stress fiber organization. This is the first work showing the dependence between the functional state of the acto-myosin II system and calcium signaling stressing the reversible character of this relationship.

Źródło:

Acta Biochimica Polonica; 2006, 53, 4; 825-831
0001-527X

Pojawia się w:

Acta Biochimica Polonica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 95.

Tytuł:

Regulation of subcellular localization of muscle FBPase in cardiomyocytes. The decisive role of calcium ions

Autorzy:

Majkowski, Michal
Wypych, Dorota
Pomorski, Pawel
Dzugaj, Andrzej

Powiązania:

https://bibliotekanauki.pl/articles/1042732.pdf

Data publikacji:

2010

Wydawca:

Polskie Towarzystwo Biochemiczne

Tematy:

cardiomyocytes
Z-line
insulin
calcium
intercalated disc
muscle FBPase

Opis:

Glyconeogenesis, the synthesis of glycogen from carbohydrate precursors like lactate, seems to be an important pathway participating in replenishing glycogen in cardiomyocytes. Fructose-1,6-bisphosphatase (FBPase), an indispensible enzyme of glyconeogenesis, has been found in cardiomyocytes on the Z-line, in the nuclei and in the intercalated discs. Glyconeogenesis may proceed only when FBPase accumulates on the Z-line. Searching for the mechanism of a FBPase regulation we investigated the effects of the calcium ionophore A23187, a muscle relaxant dantrolene, glucagon, insulin and medium without glucose on the subcellular localization of this enzyme in primary culture of neonatal rat cardiomyocytes. Immunofluorescence was used for protein localization and the intracellular calcium concentration was measured with Fura. We found that the concentration of calcium ions was the decisive factor determining the localization of muscle FBPase on the Z-line. Calcium ions had no effect on the localization of the enzyme in the intercalated discs or in the nuclei, but accumulation of FBPase in the nuclei was induced by insulin.

Źródło:

Acta Biochimica Polonica; 2010, 57, 4; 597-605
0001-527X

Pojawia się w:

Acta Biochimica Polonica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 96.

Tytuł:

Ca2+differently affects hydrophobic properties of guanylyl cyclase-activating proteins (GCAPs) and recoverin.

Autorzy:

Gorczyca, Wojciech
Kobiałka, Marcin
Kuropatwa, Marianna
Kurowska, Ewa

Powiązania:

https://bibliotekanauki.pl/articles/1043612.pdf

Data publikacji:

2003

Wydawca:

Polskie Towarzystwo Biochemiczne

Tematy:

fluorescence
calcium-binding proteins
recoverin
guanylyl cyclase-activating proteins

Opis:

Guanylyl cyclase-activating proteins (GCAPs) and recoverin are retina-specific Ca2+-binding proteins involved in phototransduction. We provide here evidence that in spite of structural similarities GCAPs and recoverin differently change their overall hydrophobic properties in response to Ca2+. Using native bovine GCAP1, GCAP2 and recoverin we show that: i) the Ca2+-dependent binding of recoverin to Phenyl-Sepharose is distinct from such interactions of GCAPs; ii) fluorescence intensity of 1-anilinonaphthalene-8-sulfonate (ANS) is markedly higher at high [Ca2+]gfree (10 μM) than at low [Ca2+]free (10 nM) in the presence of recoverin, while an opposing effect is observed in the presence of GCAPs; iii) fluorescence resonance energy transfer from tryptophane residues to ANS is more efficient at high [Ca2+]free in recoverin and at low [Ca2+]free in GCAP2. Such different changes of hydrophobicity evoked by Ca2+ appear to be the precondition for possible mechanisms by which GCAPs and recoverin control the activities of their target enzymes.

Źródło:

Acta Biochimica Polonica; 2003, 50, 2; 367-376
0001-527X

Pojawia się w:

Acta Biochimica Polonica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 97.

Tytuł:

Plasma membrane Ca2+ -ATPase in excitable and nonexcitable cells.

Autorzy:

Żylińska, Ludmiła
Soszyński, Mirosław

Powiązania:

https://bibliotekanauki.pl/articles/1044284.pdf

Data publikacji:

2000

Wydawca:

Polskie Towarzystwo Biochemiczne

Tematy:

calcium homeostasis
brain
erythrocytes
plasma membrane Ca2+ -ATPase

Opis:

There is a significant number of data confirming that the maintenance of calcium homeostasis in a living cell is a complex, multiregulated process. Calcium efflux from excitable cells (i.e., neurons) occurs through two main systems - an electrochemically driven Na+/Ca2+ exchanger with a low Ca2+ affinity (K0.5 = 10-15 μM), and a plasmalemmal, specific Ca2+-ATPase, with a high Ca2+ affinity (K0.5 < 0.5-1 μM), whereas in nonexcitable cells (i.e., erythrocytes) the calcium pump is the sole system responsible for the extrusion of calcium ions. The plasma membrane Ca2+-ATPase (PMCA) is a ubiquitously expressed protein, and more than 26 transcripts of four PMCA genes are distributed in a tissue specific manner. Differences in the structure and localization of PMCA variants are thought to correlate with specific regulatory properties and may have consequences for proper cellular Ca2+ signaling. The regulatory mechanisms of calcium pump activity have been studied extensively, resulting in a new view of the functioning of this important molecule in the membranes.

Źródło:

Acta Biochimica Polonica; 2000, 47, 3; 529-539
0001-527X

Pojawia się w:

Acta Biochimica Polonica

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 98.

Tytuł:

The effect of meat and bone meal applied without or with mineral nitrogen on macronutrient content and uptake by winter oilseed rape

Autorzy:

Nogalska, A.
Zaluszniewska, A.

Powiązania:

https://bibliotekanauki.pl/articles/1192383.pdf

Data publikacji:

2020

Wydawca:

Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza

Tematy:

rapeseeds
straw
nitrogen
phosphorus
potassium
calcium
magnesium
animal meal

Opis:

Meat and bone meal (MBM) can be a viable alternative to natural, organic and mineral fertilizers because it is rich in nitrogen (N), phosphorus (P), calcium (Ca), micronutrients and organic matter that can be recycled back into agricultural land. The aim of this study was to determine the optimal dose of MBM for winter oilseed rape (Brassica napus L.). Meat and bone meal was applied at three doses (1.0, 1.5 and 2.0 Mg ha-1) with the addition of mineral nitrogen at 79 and 40 kg N ha-1, and without the addition of mineral nitrogen (0 kg N ha-1), respectively. The effects exerted by MBM were compared with those exerted by mineral NPK fertilization (control treatment). Since MBM had low K content, K rate was 145 kg ha-1 in all treatments, and it was applied with mineral fertilizers. The macronutrient (N, P, K, Ca and Mg) content of winter oilseed rape seeds and straw, and macronutrient uptake by aboveground biomass were evaluated. A small-scale field experiment was conducted in northeastern Poland. The experiment had a randomized block design, and it was established on Dystric Cambisol developed from loamy sand. Changes in the uptake of the analyzed macronutrients and their concentrations in winter oilseed rape seeds and straw were affected by fertilization and weather conditions. Supplemental mineral N was applied before sowing to widen the narrow N/P ratio in MBM, which had a beneficial influence on the mineral composition and macronutrient uptake by the aboveground biomass of winter oilseed rape. Macronutrient (N, P, Ca and Mg) uptake by plants was highest in the treatment with the lowest MBM dose (1.0 Mg MBM ha-1) supplemented with 79 kg mineral N (50% N from mineral fertilizer and 50% N from MBM). The results of this study indicate that MBM applied at the dose of 1.0 t ha-1 meets the P and N requirements of winter oilseed rape in 100% and 50%, respectively. Therefore, the recommended mineral N fertilizer rate for winter oilseed rape can be reduced by 50%.

Źródło:

Journal of Elementology; 2020, 25, 3; 905-915
1644-2296

Pojawia się w:

Journal of Elementology

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 99.

Tytuł:

Setting Time and Compressive Strength of Geopolymers Made of Three Indonesian Low Calcium Fly Ash with Variation of Sodium Silicate Addition

Autorzy:

Hidayati, Ririn Eva
Faradilla, Fitria Sandi
Dadang, Dadang
Harmelia, Lia
Nurlina, Nurlina
Prasetyoko, Didik
Fansuri, Hamzah

Powiązania:

https://bibliotekanauki.pl/articles/2049135.pdf

Data publikacji:

2021

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

fly ash
geopolymer
sodium silicate
low calcium
waste management

Opis:

In this research, the effect of sodium silicate (Na2SiO3) on the geopolymerization of fly ash type F (low calcium) has been studied. the variations of Na2SiO3 used in the synthesized geopolymers were 19, 32, and 41wt%. the fly ash from three different power plant sources was characterized using X-Ray Fluorescence (XRF), X-Ray diffraction (XRD), Particle Size Analyzer (PSA), and Scanning Electron Microscopy (SEM). Fly ash-based geopolymers were tested for mechanical strength and setting time. the best geopolymer was obtained by adding 32% Na2SiO3, produced a compressive strength of 21.62 MPa with a setting time of 30 hours. additions of 19wt% Na2SiO3 failed to form geopolymer paste while the addition of 41wt% Na2SiO3 decreased the mechanical strength of the geopolymer. Higher calcium content in low calcium fly ash produces stronger geopolymer and faster setting time.

Źródło:

Archives of Metallurgy and Materials; 2021, 66, 4; 1115-1121
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 100.

Tytuł:

Anticorrosive and physicochemical properties of modified phosphate pigments

Autorzy:

Przywecka, Katarzyna
Grzmil, Barbara
Kowalczyk, Krzysztof

Powiązania:

https://bibliotekanauki.pl/articles/778221.pdf

Data publikacji:

2019

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

anticorrosive pigments
modified phosphates
calcium molybdate
electrochemical noise test

Opis:

Many studies have been carried out in the direction of improvement of the effectiveness of commonly utilized phosphate corrosion inhibitors. For this purpose various types of modifications are realized, e.g. introduction of different cations to the pigment composition or replacement of phosphate anions with others. In the presented work, anticorrosive pigments containing calcium hydrogen phosphate, and/or calcium hydroxyphosphate, and calcium molybdate were obtained. The phase and chemical composition and the oil absorption number of those materials were determined. The anticorrosive properties were investigated by an electrochemical noise method. The obtained results were compared with previously published studies concerning pigments containing (NH₄)₃Al₂(PO₄)₃ and/or AlPO₄, and CaMoO₄. It was found that the pigment containing only calcium molybdate(VI) is not an effective corrosion inhibitor. However, the pigments comprising a mixture of CaHPO₄ and CaMoO₄ exhibited good anticorrosive properties and they were characterized by higher effectiveness in the corrosion protection than compared materials.

Źródło:

Polish Journal of Chemical Technology; 2019, 21, 1; 20-23
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

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