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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