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Wyświetlanie 1-15 z 493
Tytuł:
Improvement of the mechanical properties of biphasic calcium phosphate ceramic composite using silicene
Autorzy:
Abdulridha, Nazar J.
Al-Ghaban, Ahmed M.
Al-Obaidi, Anwer J.
Powiązania:
https://bibliotekanauki.pl/articles/38900060.pdf
Data publikacji:
2023
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
silicene
silicon nanosheet
ceramic composite
calcium phosphates
hydroxyapatite
beta-tricalcium phosphate
Opis:
In light of recent events in the replacement and generation of human tissues, it is becoming extremely difficult to ignore the existence of bioceramics. Although hydroxyapatite and betatricalcium phosphate materials are frequently employed individually, they both lack certain qualities. As a result, combining hydroxyapatite and beta-tricalcium phosphate may result in the combination of their respective qualities. The current study aims to investigate the effect of using a novel nanostructure called silicene (silicon nanosheet-SiNS) on the mechanical properties of the composite ceramic (biphasic calcium p hosphate) at various ratios of hydroxyapatite and beta-tricalcium phosphate. The silicene has been synthesized and added at different weight percentages of 1, 3, and 5%. The results reveal that the compressive strength improved due to increasing the content of silicene. The average of increasing was between 58.6% and 142% because of the strong hexagonal structure of silicene. At the same time, the hardness of the biphasic calcium phosphate composite was enhanced by increasing the weight percentage of silicene. However, the hardness decreased when the content of silicene was more than 3% due to the presence of small cavities on the surface of the samples.
Źródło:
Engineering Transactions; 2023, 71, 2; 185-195
0867-888X
Pojawia się w:
Engineering Transactions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of calcium sulfoaluminate additive on linear deformation at different humidity and strength of cement mortars
Autorzy:
Abdulwahid Al-Musawi, Kadhim
Bindhu Abraham, Kottayil
Potses, Tatsiana
Leonovich, Sergey
Kalinouskaya, Natallia
Beulah, M.
Budrevich, Neli
Powiązania:
https://bibliotekanauki.pl/articles/110953.pdf
Data publikacji:
2020
Wydawca:
Centrum Rzeczoznawstwa Budowlanego Sp. z o.o.
Tematy:
shrinkage
cracks
calcium sulfoaluminate additives
expanding additives
Opis:
The effect of calcium sulfoaluminate additives (CSA) on the compression and bending strength of mortar, as well as linear deformation of prism samples at different environmental humidity was studied. Test results indicate that bending strength of mortars with CSA and the referent at the age of 28 days are practically equal. Compressive strength of mortars with CSA reduced by 20 ... 23% for all dosages of CSA. Relative linear deformations depend on the humidity of the environment. At a humidity of 100%, the relative linear deformations are positive and the expansion increases with increasing dosage of the expanding additive. When hardening in dry air at a humidity of 55%, the greatest shrinkage deformations were for mortars with CSA. We can conclude that the expanding effect of CSA is fully manifested at high humidity, i.e. under construction conditions, this means very high-quality moisture care for concrete structures.
Źródło:
Inżynieria Bezpieczeństwa Obiektów Antropogenicznych; 2020, 2; 1-9
2450-1859
2450-8721
Pojawia się w:
Inżynieria Bezpieczeństwa Obiektów Antropogenicznych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of different K+/Ca2+ rations on yield, quality and physiological disorder in soilless strawberry cultivation
Autorzy:
Adak, N.
Powiązania:
https://bibliotekanauki.pl/articles/12207996.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Tematy:
plant cultivation
strawberry
Fragaria ananassa
plant hybrid
Albion cultivar
Festival cultivar
plant cultivar
plant nutrition
soilless cultivation
calcium
potassium
cocopeat
Opis:
The balance of mineral nutrients in plant nutrient solutions has an influence on yield, fruit quality and physiological disorder of strawberries grown in soilless conditions. Nutrient solutions that enhance the yield and quality of plants grown in soilless conditions are optimized through anion-cation equilibrium, optimum K++Ca2+/Mg2+ and K+/Ca2+ ratios. In this study, the effect of three different K+/Ca2+ ratios (5.5/7.0; 5.0/7.0; 6.0/6.0) on some morpho-physiological features (crown diameter, chlorophyll index, leaf temperature), fruit yield, fruit quality (fruit weight, total soluble solids, titratable acidity, ascorbic acid, firmness) and physiological disorder (tip burn) of ‘Albion’ and ‘Festival’ strawberries, were investigated. Results show that increasing K+/Ca2+ ratios significantly accelerated the tip burn incidence. On the other hand, the highest yield, firmness and the lowest tip burn were achieved at 5.5/7.0 ratio of K+/Ca2+ treatment.
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2019, 18, 2; 229-236
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of physicochemical properties and the thermal stability of hydroxyapatite
Określenie właściwości fizykochemicznych i stabilności termicznej hydroksyapatytu
Autorzy:
Adamczyk, Z.
Jaszczółt, K.
Jachimska, B.
Powiązania:
https://bibliotekanauki.pl/articles/391634.pdf
Data publikacji:
2008
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa
Tematy:
trójfosforan wapnia
polielektrolity
spoiwa
hydroksyapatyt
calcium triphosphate
polyelectrolytes
slurries
hydroxyapatite
Opis:
Hydroxyapatite [1-3] of structural formula Ca10(PO)6(OH)2 (HAp) and calcium triphosphate Ca3(PO)2 (TCP) powder sand suspensions have been characterized physicochemically. Physicochemical characteristics involved the analysis of phase composition using the X ray diffraction, the powder morphology using SEM method, determination of specific surface area by the BET method, the grain distribution of HAp water suspensions using laser diffractometer and the zeta potential as a function of suspension pH (isoelectric point) by the measurement of the electrophoretic mobility.
Badania fizykochemiczne przeprowadzono dla proszków i suspensji hydroksyapatytu [1-3] o wzorze strukturalnym Ca10(PO)6(OH)2 (oznaczonym dalej jako HAp) oraz trójfosforanu wapnia Ca3(PO)2 (oznaczonego dalej jako TCP). Badania fizykochemiczne obejmowały analizę składu fazowego przy użyciu dyfrakcji rentgenowskiej, morfologię proszków przy pomocy metody SEM, wyznaczenie powierzchni właściwej metodą BET, rozkład ziarnowy suspensji wodnych HAp przy użyciu dyfraktometru laserowego, oraz potencjału zeta w funkcji pH suspensji (punktu izoelektrycznego) na drodze ruchliwości elektroforetycznej.
Źródło:
Prace Instytutu Odlewnictwa; 2008, 48, 1; 21-29
1899-2439
Pojawia się w:
Prace Instytutu Odlewnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of prohexadione-calcium on vegetative growth and reproduction of ‘0900 Ziraat’ sweet cherry
Autorzy:
Aglar, E.
Powiązania:
https://bibliotekanauki.pl/articles/11861883.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Tematy:
wild cherry
Prunus avium
0900 Ziraat cultivar
plant cultivar
vegetative growth
prohexadione-calcium
growth regulator
Regalis preparation
Opis:
Effects of prohexadione-calcium (ProCa, 125 and 250 mgL–1) and ProCa + ammonium sulfate (AMS, 500 mgL–1) treatments on vegetative characteristics (shoot growth, branch diameter, trunk cross-sectional area (TCSA), canopy volume, number of flower per cm2, number of fruits per cm2) and quality parameters (fruit size, flesh firmness, color, titratable acidity and soluble solids content (SSC)) of ‘0900 Ziraat’ sweet cherry were investigated in this study. Solutions were sprayed when the shoots were just 10 cm long in 2014 and 2015. As compared to control, in 2015, TCSA decreased only with ProCa treatments (125 and 250 mgL–1) and canopy volume and shoot length decreased with all treatments. On the other hand, number of flower and fruit per cm2 significantly increased with all treatments. While there were not significant differences in fruit size, flesh firmness, color, SSC and titratable acidity values were significantly lower in 250 mgL–1 ProCa and 250 mgL–1 ProCa + AMS treatments. It was concluded that ProCa treatments could be used as an efficient tool for suppression of shoot growth and to increase the number of flower and fruits per cm2 in ‘0900 Ziraat’ sweet cherry cultivar.
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2018, 17, 4; 73-80
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nutrient uptake, proline content and antioxidant enzymes activity of pepper (Capsicum annuum L.) under higher electrical conductivity of nutrient solution created by nitrate or chloride salts of potassium and calcium
Autorzy:
Ahmadi, M.
Souri, M.K.
Powiązania:
https://bibliotekanauki.pl/articles/12611712.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Tematy:
plant cultivation
chilli pepper
Capsicum annuum
nutrient uptake
proline content
antioxidant enzyme
electrical conductivity
nutrient solution
chloride salt
potassium salt
calcium salt
Opis:
This study was conducted to evaluate the effects of higher conductivity of nutrient solution created by nitrate or chloride salts of potassium and calcium on growth characteristics of pepper plants (Capsicum annuum var annuum) during four months of growth period. Two EC5 and EC8 dS/m of Hoagland nutrient solutions were prepared using various salt combinations, namely: KCl + CaCl2, KNO3 + CaNO3, and KNO3 + CaNO3 + NaCl. Hoagland nutrient solution with EC 1.8 dS/m served as a control. Higher conductivity treatments had different effects on pepper plant growth. The most significant reduction in growth parameters of plant height, shoot fresh weight, fruit yield and nutrients uptake was in plants treated with KCl + CaCl2 particularly at EC8. Application of KNO3 + CaNO3 particularly at EC5, showed no difference as compared to the control regarding many growth parameters. Application of KNO3 + CaNO3 at EC5 resulted in higher shoot fresh weight compared to the control. All salinity treatments, except from KNO3 + CaNO3 at EC5, reduced the fruit yield compared to the control. Treatments of KCl + CaCl2 and KNO3 + CaNO3 + NaCl particularly at EC8 of nutrient solution, resulted in higher leaf proline concentration, catalase and peroxidase enzymes activity compared to the control. Other conductivity treatments showed no difference in catalase or peroxidase enzymes activities. Significantly the lowest amount of leaf N, K, Mg and Ca was in KCl + CaCl2 at EC8. On the other hand, the highest leaf macronutrient concentrations were in KNO3 + CaNO3 at EC5 and/or EC8 that showed only higher leaf N and Ca values compared to the control. Leaf micronutrient concentrations were the highest in KNO3 + CaNO3 at EC5 that generally showed no difference with control plants. However, application of KCl + CaCl2 particularly at EC8 and to less extent KNO3 + CaNO3 + NaCl at EC8, reduced the leaf micronutrient concentrations. Application of KNO3 + CaNO3 at EC5 increased and KCl + CaCl2 or KNO3 + CaNO3 + NaCl at EC8 decreased the leaf Fe concentration compared to control plants.
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2019, 18, 5; 113-122
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of tocolytic drugs (isoxsuprine hydrochloride) during the implantation period in pregnant sheep
Autorzy:
Akbulut, N.K.
Kal, Y.
Powiązania:
https://bibliotekanauki.pl/articles/16628474.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
isoxsuprine hydrochloride
reproductive parameters
progesterone
cortisol
calcium
Opis:
In this study, the effects of isoxsuprine hydrochloride applied 14 and 15 days after insemination in Anatolian Merino Sheep on lamb yield and some blood parameters were investigated. The research was conducted during the breeding season and 54 ewes inseminated on the same day were used. The ewes were assigned to three groups. Group I: For the placebo effect, physiological saline was injected on the 14th day into half of the control group and on the 15th day into the other half after insemination (n=18). Group II: Tocolytic drug was injected on the 14th day after insemination (n=18). Grop III: Tocolytic drug was injected on the 15th day after insemination (n=18). As the tocolytic drug, isoxsuprine hydrochloride (HCl) 3 ml (Utelax, Sanovel, Türki̇ye) was used intramuscularly. The number of pregnant and viviparous ewes, single and multiple birth ewes, lambs per viviparous ewes were determined as reproductive parameters. Blood progesterone, cortisol and calcium concentration were determined. As a result, it was determined that the single application of isoxsuprine hydrochloride (3 ml) in the implantation period did not have a positive or negative effect on reproductive parameters, and did not change the blood progesterone, calcium and cortisol concentration in ewes.
Źródło:
Polish Journal of Veterinary Sciences; 2022, 25, 4; 557-560
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Equilibrium and kinetic studies of sorption of 2.4-dichlorophenol onto 2 mixtures: bamboo biochar plus calcium sulphate (BC) and hydroxyapatite plus bamboo biochar plus calcium sulphate (HBC), in a fluidized bed circulation column
Autorzy:
Alamin, A.H.
Kaewsichan, L.
Powiązania:
https://bibliotekanauki.pl/articles/780072.pdf
Data publikacji:
2016
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
2.4-dichlorophenol
bamboo biochar
hydroxyapatite
calcium sulphate
adsorption
Opis:
Sorption studies were carried out to investigate removal of 2.4-dichlorophenol (2.4-DCP) from aqueous solution in a fluidized bed by two types of adsorbent mixtures: BC (Bamboo char plus Calcium sulphate), and HBC (Hydroxyapatite plus Bamboo char plus Calcium sulphate); both manufactured in ball shape. The main material bamboo char was characterized by FTIR, DTA and SEM. The adsorption experiments were conducted in a fluidized bed circulation column. Adsorption, isotherms and kinetic studies were established under 180 min operating process time, at differentinitial 2.4-DCP solution concentrations ranging from 5–10 mg/L, and at different flow rates ranging from 0.25–0.75 L/min. The data obtained fitted well for both the Langmuir and Freundlich isotherm models; indicating favorable condition of monolayer adsorption. The kinetics of both adsorbents complies with the pseudo second-order kinetic model. BC was proven a new effective composite and low cost adsorbent which can be applied in the field of wastewater treatment, and it can also play an important role in industry water treatment.
Źródło:
Polish Journal of Chemical Technology; 2016, 18, 2; 59-67
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Induction of hemolysis and eryptosis by occupational pollutant nickel chloride is mediated through calcium influx and p38 MAP kinase signaling
Autorzy:
Alfhili, Mohammad A.
Alamri, Hassan S.
Alsughayyir, Jawaher
Basudan, Ahmed M.
Powiązania:
https://bibliotekanauki.pl/articles/2085691.pdf
Data publikacji:
2022-02-15
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
calcium
p38 MAPK
oxidative stress
hemolysis
nickel
eryptosis
Opis:
ObjectivesNickel (Ni) is an abundant environmental hazard and an occupational pollutant. Exposure to Ni compounds is prevalent in electroplating workers and in the printing industry, among others. The toxicity of Ni manifests as dermatological, gastrointestinal, respiratory, allergic, and cardiovascular symptoms. In particular, hyperbilirubinemia and reticulocytosis have been detected in intoxicated subjects; an observation possibly implicating selective red blood cell (RBC) toxicity. Herein, the interaction of nickel chloride (NiCl2) with human RBCs and associated molecular mechanisms are described.Material and MethodsCells from healthy donors were incubated for 24 h at 37°C in the presence or absence of 0.5‒10 mM of NiCl2, and cytotoxicity was determined through hemoglobin leakage by colorimetry under different experimental conditions. Eryptotic markers were also identified by flow cytofluorometry using Annexin-V-FITC tagging for phosphatidylserine (PS) exposure, light scatter properties for cellular dimensions, Fluo4/AM labeling for intracellular calcium, and H2DCFDA staining for reactive oxygen species (ROS). Additionally, small molecule inhibitors were used to probe the signaling pathways involved.ResultsIt was found that NiCl2 at 10 mM caused profound intracellular calcium overload and significant calcium-dependent hemolysis. Also, NiCl2 reduced forward scatter and increased side scatter, Annexin-positive cells, and ROS levels. Importantly, NiCl2-induced hemolysis was significantly attenuated by the exclusion of extracellular calcium, and in the presence of p38 MAP kinase (MAPK) inhibitor SB203580.ConclusionsIt is concluded that NiCl2 induces p38 MAPK-dependent hemolysis, and stimulates the canonical features of premature eryptosis. This report presents the first description of the molecular mechanisms underlying the hemolytic and eryptotic potential of NiCl2 and, thus, may explain changes in hematological parameters observed in poisoning victims.
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2022, 35, 1; 1-11
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Band keratopathy - chelation or therapeutic photokeratectomy
Autorzy:
Alsoubie, Ismael
Pyza, Aneta
Kaczmarek, Julia
Czarnacka, Kinga
Prokop, Dominika
Kuźlik, Bartosz
Chmura, Alicja
Pandey, Ada
Gawlak, Małgorzata
Żaczek, Bartłomiej
Sajak-Hydzik, Katarzyna
Pawlicka, Ilona
Piskorz, Agnieszka
Kozak, Maciej
Roszkowska, Anna Maria
Powiązania:
https://bibliotekanauki.pl/articles/23202547.pdf
Data publikacji:
2023-09-30
Wydawca:
Medical Education
Tematy:
band keratopathy
calcium deposits
EDTA chelation
phototherapeutic keratectomy
excimer laser
corneal degeneration
ethylenediaminetetraacetic acid
Opis:
Corneal degeneration changes corneal shape and causing its translucency disappear. The division of corneal degeneration is made according to the type deposited in its layer. Among the factors causing keratopathy, the following can be mentioned: iron, collagen, hemosiderins, and calcium salts, the last ones cause band keratopathy. This feature is characteristic of the deposition of opacities in the superficial layers of the cornea. In the treatment of band keratopathy, ethylenediaminetetraacetic acid chelation and excimer laser phototherapeutic keratectomy are discussed.
Źródło:
OphthaTherapy; 2023, 10, 3; 195-199
2353-7175
2543-9987
Pojawia się w:
OphthaTherapy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ameliorative effect of CaCl2 on growth, membrane permeability and nutrient uptake in Oryza sativa grown at high NaCl salinity
Autorzy:
Anbu, D.
Sivasankaramoorthy, S.
Powiązania:
https://bibliotekanauki.pl/articles/10791.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
ameliorative effect
calcium chloride
pot experiment
plant growth
membrane permeability
nutrient uptake
Oryza sativa
sodium chloride
salinity
Opis:
A pot culture was carried out with Oryza sativa L. vari-Co-39, to investigate the effects of supplementary calcium chloride on plants grown at NaCl (50mM) concentration. Treatments were: (1) Control: nutrient solution alone (C); (2) nutrient solution plus 50mM sodium chloride (NaCl); (3) nutrient solution plus 10mM calcium chloride (CaCl2); (4) nutrient solution plus 15mM calcium chloride (CaCl2); (5) nutrient solution and 50 mM NaCl plus supplementary 10 mM CaCl2 (NaCl + CaCl2); and (6) 50 mM NaCl plus additional mixture of 15 mM CaCl2 in nutrient solution (NaCl + CaCl2). The plants grown under salt stress produced low dry weight and relative water content than those grown in standard nutrient solution and in CaCl2 alone. Supplemental calcium chloride added to nutrient solution containing salt significantly improved growth and relative water content. Membrane permeability increased with high NaCl application and these increases in root membrane permeability were decreased with supplementary Ca. The concentration of chloride (Cl) increases highly for all treatments. Sodium (Na) concentration in plant tissues increased in both shoots and roots at high NaCl treatment. Application of supplementary Ca lowered Na concentration. Concentrations of Ca. K and N were at deficient ranges in the plants grown at high NaCl levels and these deficiencies were corrected by supplementary Ca. The ameliorating effect of Ca on growth and physiological variables could reduce the negative effect of salinity of Oryza sativa L., plants.
Źródło:
International Letters of Natural Sciences; 2014, 03
2300-9675
Pojawia się w:
International Letters of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nutrient requirements of the premature infant and recommended nutrient intakes
Autorzy:
Anderson, G.H.
Zlotkin, S.H.
Powiązania:
https://bibliotekanauki.pl/articles/1372549.pdf
Data publikacji:
1996
Wydawca:
Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Tematy:
nutrient intake
trace element
magnesium
premature infant
vitamin
water
carbohydrate
energy
nutrient requirement
feeding
fat
calcium
sodium
nutrient composition
potassium
protein
mineral intake
phosphorus
chloride
Opis:
In summary, the nutrient requirements of the premature infant are not well defined, but the CPS Nutrition Committee has provided a systemic framework for describing recommended nutrient intakes. These current recommended intakes appear to provide safe quantities of nutrients that support intrauterine growth rates. Still uncertain, however, is the extent to which the recommended intakes lead to the provision of energy and nutrients in quantity and composition in amounts that allow the premature infant to achieve all aspects of normal in utero development, especially that of the nervous system.
Źródło:
Polish Journal of Food and Nutrition Sciences; 1996, 05, 3; 3-12
1230-0322
2083-6007
Pojawia się w:
Polish Journal of Food and Nutrition Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diagnostic values of calcium and magnesium forms determined in human serum and saliva
Wartosc diagnostyczna form wapnia i magnezu oznaczonych w ludzkiej surowicy krwi i slinie
Autorzy:
Andrusishina, I N
Powiązania:
https://bibliotekanauki.pl/articles/15539.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Tematy:
diagnostic value
calcium form
magnesium form
determination
human serum
serum
human saliva
saliva
atomic absorption spectrometry
Opis:
Calcium and magnesium are known to be necessary for the normal function of various systems in animal and human organisms. There are many diseases caused by abnormal concentration of electrolytes, e.g. arterial hypertension or nervous system diseases such as multiple sclerosis, Mb. Alzheimer or Mb. Parkinson. The mechanisms of homeostasis indicate only the ionized forms of these elements. It is known that ionized calcium serves as an endocellular intermediary in action of enzymes and hormones in cells. Therefore, it is very important to define levels of total and ionized forms of Ca2+ and Mg2+ in blood serum and saliva by the method of atomic absorption spectrometry and to show their diagnostic value for various pathological conditions of a human body. The 39 persons, aged 21 to 47 years take part in these investigations. The results of determinations of calcium and magnesium forms present in human serum and saliva, representing physiological states are presented. The age and daily fluctuations of Ca2+ and Mg2+ content in serum and saliva were studied by atomic absorption spectrometry. The levels of non albumin forms of these elements were found by FAAS. The significance of determination of calcium and magnesium levels in serum and saliva under various pathological conditions (arterial hypertension and osteoporosis) was shown.
Wapń i magnez to pierwiastki niezbędne do prawidłowego funkcjonowania organizmów zwierzęcych i ludzkich. Istnieje wiele chorób wywoływanych przez nieprawidłowe stężenia elektrolitów, np. nadciśnienie tętnicze lub choroby układu nerwowego, takie jak SM, choroba Alzheimera lub Parkinsona. Mechanizmy homeostazy wskazują jedynie na zjonizowane formy tych pierwiastków. Wiadomo, że zjonizowana forma wapnia służy jako międzykomórkowy pośrednik między enzymami i hormonami w komórkach. Dlatego tak ważne jest określenie zawartości całkowitych tych pierwiastków oraz jonów Ca2+ i Mg2+ w surowicy krwi oraz w ślinie za pomocą metody absorpcyjnej spektrometrii atomowej oraz wykazanie ich roli w diagnostyce różnych stanów patologicznych w organizmie człowieka. Badaniami objęto 39 osób w wieku od 21 do 47 lat. W pracy przedstawiono wyniki oznaczeń form wapnia i magnezu występujących w ludzkiej surowicy krwi oraz ślinie odpowiadające stanom fizjologicznym. Wahania w zawartości Ca2+ i Mg2+ w surowicy i ślinie, w zależności od wieku i pory dnia, badano za pomocą aborpcyjnej spektrofotometrii atomowej. Zawartości niealbuminowych form tych pierwiastków określono za pomocą FAAS. Wykazano istotność oznaczeń zawartości wapnia i magnezu dla różnych stanów chorobowych (nadciśnienie tętnicze, osteoporoza).
Źródło:
Journal of Elementology; 2010, 15, 3; 425-433
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of sewage sludge and furnace waste on the content of selected elements in the sward of legume-grass mixture
Wplyw osadow sciekowych i odpadow paleniskowych na zawartosc wybranych pierwiastkow w runi mieszanki motylkowo-trawiastej
Autorzy:
Antonkiewicz, J
Powiązania:
https://bibliotekanauki.pl/articles/15597.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Tematy:
sewage sludge
furnace waste
element content
sod
legume-grass mixture
ash
magnesium
calcium
potassium
sodium
phosphorus
Opis:
Industrial landfills resulting from operations of various industries, particularly power generation, create specific habitat conditions for flora. Among the waste which may be used for recultivation of dumping heaps there is sewage sludge, which contains a considerable amount of nutrients crucial for plants. This investigation aimed at identification of the effect of sewage sludge and furnace ashes on the content of selected elements in a mixture of grass and white clover recommended for furnace ash heap recultivation. The experimental design comprised 6 treatments (each in four replications), which differed in a dose of the supplied sewage sludge and furnace ashes: 1) control (without waste admixture), 2) 200 t d.m. of sewage sludge, 3) 200 t d.m. of ash, 4) 150 t d.m. of sludge + 50 t d.m. of ash, 5) 50 t d.m. of ash + 150 t d.m. of ash, 6) 100 t d.m. of ash + 100 t d.m. of ash. The content of macroelements in plants depended on the treatment and ranged from 2.58-31.2 g Mg, 3.16-5.85 g Ca, 16.95-18.46 g K, 0.26-1.25 g Na and 2.27-3.37 g P kg–1d.m. Plants grown exclusively on furnace ashes had the highest content of Mg, Ca and K, whereas the highest P and Na concentrations were noted in plants cultivated exclusively on sewage sludge. While assessing the content of macroelements in the plant mixture in view of its fodder value, it was found that the content of Mg and K met the standards set for good quality feeds, the amounts of Ca and Na were below the optimum, whereas the P concentration was close to the optimum value.
Składowiska poprzemysłowe będące efektem działalności różnych gałęzi przemysłu, zwłaszcza energetycznego, stanowił specyficzne warunki siedliskowe dla flory. Odpadem, który może być wykorzystany w rekultywacji hałd, może być osad ściekowy zawierający znaczną ilość składników pokarmowych niezbędnych dla roślin. Celem badań było poznanie wpływu osadów ściekowych i popiołów paleniskowych na zawartość wybranych pierwiastków w mieszance traw z koniczyną białą polecaną do rekultywacji hałd odpadów paleniskowych. Schemat doświadczenia obejmował 6 obiektów (każdy w czterech powtórzeniach), różniących się dawką wprowadzonych osadów ściekowych i popiołów paleniskowych: 1) obiekt kontrolny (bez dodatku odpadów); 2) 200 t s.m. osadu ściekowego; 3) 200 t s.m. popiołu; 4) 150 t s.m. osadu + 50 t s.m. popiołu; 5) 50 t s.m. osadu + 150 t s.m. popiołu; 6) 100 t s.m. osadu + 100 t s.m. popiołu. Zawartość makroelementów w roślinach była uzależniona od obiektu i wynosiła: 2,58-3,12 g Mg, 3,16-5,85 g Ca, 16,95-18,46 g K, 026-1,25 g Na, 2,27- -3,37 g P kg–1 s.m. Najwyższą zawartość Mg, Ca i K stwierdzono u roślin uprawianych wyłącznie na popiele paleniskowym, natomiast najwyższą zawartość P i Na – u roślin uprawianych wyłącznie na osadzie ściekowym. Oceniając zawartość makroelementów w mieszance pod względem wartości paszowej, stwierdzono, że zawartość Mg i K w mieszance roślin odpowiadała normom stawianym paszom dobrej jakości. Zawartość Ca i Na w roślinach kształtowała się poniżej wartości optymalnej, a zawartość P w roślinach była zbliżona do wartości optymalnej.
Źródło:
Journal of Elementology; 2010, 15, 3; 435-443
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
24-hour cycle of variability in contents of nitrogen forms in the surface microlayer of the Baltic Sea lagoon lake (North Poland) - Part I
24-godzinny cykl zmienności stężenia form azotu w mikrowarstwie powierzchniowej w lagunowym jeziorze Morza Bałtyckiego (północna Polska) - Część I
Autorzy:
Antonowicz, J.
Trojanowski, J.
Trojanowska, C.
Powiązania:
https://bibliotekanauki.pl/articles/85065.pdf
Data publikacji:
2010
Wydawca:
Akademia Pomorska w Słupsku
Tematy:
24-hour cycle
variability
nitrogen content
nitrogen form
surface microlayer
Baltic Sea
lagoon lake
Polska
daily change
calcium content
aquatic ecosystem
marine ecosystem
Opis:
In July 2000 the diurnal cycle of analyses was conducted in order to determine variation in the concentrations of nitrogen and calcium compounds as well as dissolved gases in surface microlayers of a shallow coastal barrier lake located at the Baltic Sea coast. Water for analyses was collected in a diurnal cycle for the period of 24 h from lake Dołgie Wielkie. The analyses were conducted on the surface microlayer with a thickness of approx. 100 μm, a layer with a thickness of approx. 250 6m and a layer of subsurface water from a depth of 15 cm. Based on the analyzed data, information was collected on the migration of nitrogen compounds between the analyzed layers. Changes were observed in nitrogen forms reduced to oxidized forms and vice versa.
W lipcu 2000 roku przeprowadzono dobowy cykl badań w celu określenia zmienności stężenia związków azotu oraz wapnia i rozpuszczonych gazów w mikrowarstwach powierzchniowych płytkiego jeziora lagunowego usytuowanego na wybrzeżu Morza Bałtyckiego. Wodę do analiz pobierano w cyklu godzinnym przez okres 24 godzin z jeziora Dołgie Wielkie. Poddano analizie mikrowarstwę powierzchniową o grubości ok. 100 6m, warstwę o grubości ok. 250 6m oraz warstwę wody podpowierzchniowej z głębokości około 15 cm. Na podstawie zanalizowanych danych uzyskano informacje dotyczące migracji związków azotu między analizowanymi warstwami. Zaobserwowano przemiany form azotu zredukowanych do utlenionych i vice versa.
Źródło:
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline; 2010, 14
1643-0115
Pojawia się w:
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 493

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