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Journal articles on the topic 'Ca and phosphate'

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Published: 3 June 2025

Last updated: 31 July 2025

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1

Valsami-Jones, E. "Mineralogical controls on phosphorus recovery from wastewaters." Mineralogical Magazine 65, no. 5 (2001): 611–20. http://dx.doi.org/10.1180/002646101317018433.

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AbstractThe removal of phosphorus from wastewaters is becoming very common, to meet water quality targets, and avoid environmental problems related to eutrophication. At the same time, agricultural application of P-rich sewage biosolids is diminishing for reasons of logistics and of public pressure. As a result P from wastewaters is ultimately disposed of in landfills. Over the long term, phosphate ore reserves will become depleted. Recycling of P from wastewaters may thus be a realistic prospect if scientific and technical issues can be resolved. At the centre of the scientific problems lie c

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2

Glazov, I. E., V. K. Krut’ko, R. A. Vlasov, O. N. Musskaya, and A. I. Kulak. "Nanocomposites based on apatitic tricalcium phosphate and autofibrin." Proceedings of the National Academy of Sciences of Belarus, Chemical Series 57, no. 4 (2021): 413–23. http://dx.doi.org/10.29235/1561-8331-2021-57-4-413-423.

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Nanocomposites based on apatitic tricalcium phosphate in an autofibrin matrix were obtained by precipitation at a Ca/P ratio of 1.50, pH 9 and a maturation time from 30 min to 7–14 days. The resorbability of nanocomposites was determined by the composition of calcium phosphates, which, during long-term maturation, formed as the calcium-deficient hydroxyapatite with a Ca/P ratio of 1.66, whereas biopolymer matrix favored the formation of more soluble calcium phosphates with a Ca/P ratio of 1.53–1.59. It was found that the fibrin clot stabilized, along with apatitic tricalcium phosphate, the pha

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3

Middleton, J. P., F. J. Albers, V. W. Dennis, and J. R. Raymond. "Thapsigargin demonstrates calcium-dependent regulation of phosphate uptake in HeLa cells." American Journal of Physiology-Renal Physiology 259, no. 4 (1990): F727—F731. http://dx.doi.org/10.1152/ajprenal.1990.259.4.f727.

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We used thapsigargin, a sesquiterpene lactone that mobilizes intracellular Ca without increases in inositol phosphates or major activation of protein kinase C (PKC), to test the specific effects of increasing cytosolic Ca on Na-dependent phosphate uptake in HeLa cells. Thapsigargin increased the Vmax for phosphate uptake from 5.40 +/- 0.26 to 7.86 +/- 0.43 nmol.mg protein-1.3 min-1 (n = 7, P less than 0.001) without change in the apparent Km for phosphate, which averaged 0.15 +/- 0.02 mM. The effect of thapsigargin was dependent on concentration and time. Inactivation of PKC by overnight expos

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Jamroz, Dorota, Agnieszka Gajda-Janiak, Zbigniew Wzorek, Zygmunt Kowalski, and Janusz Kubizna. "Chemical and Biological Characteristics of Different Hydrated Monocalcium Phosphates for Broiler Chickens." Annals of Animal Science 12, no. 2 (2012): 187–200. http://dx.doi.org/10.2478/v10220-012-0016-4.

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Chemical and Biological Characteristics of Different Hydrated Monocalcium Phosphates for Broiler ChickensThree hydrated monocalcium phosphates differing in purity (with or without monetite, or monetite and calcite) and in crystalline structure were used in broiler chickens diets. The performance indices, concentration of Ca, P and Mg and activity of alkaline phosphatase in blood plasma, the content of these mineral elements in bones, and physico-mechanical parameters of femur and tibia bones were recorded. Body weight on 35th day of life, feed intake and mechanical parameters of bone quality w

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5

de Oliveira, Sara Verusca, Marcus Vinícius Lia Fook, Elaine Patrícia Araújo, et al. "Obtaining Tetracalcium Pohosphate and Hydroxyapatite in Powder Form by Wet Method." Materials Science Forum 660-661 (October 2010): 954–58. http://dx.doi.org/10.4028/www.scientific.net/msf.660-661.954.

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The development of research in the area of advanced materials and tissue engineering has increased greatly in recent years found that bioceramics are outstanding in the replacement and regeneration of bone tissue, mainly formed by the calcium phosphate ceramics. The objective of this research is to obtain the calcium phosphate where Ca/P = 1.67 and 2.0, to observe the formation of phases after having subjected these materials to heat treatment. The calcium phosphate was produced by the wet method using a direct reaction of neutralization and characterized by X-ray diffraction (XRD), scanning e

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6

ANDRALOJC, P. John, Jane E. RYAN, Martin A. J. PARRY, and Alfred J. KEYS. "2-Carboxyarabinitol 1-phosphate (CA1P) formation through a phosphate exchange reaction catalysed by the CA1P phosphatase from French bean (Phaseolus vulgaris L.)." Biochemical Journal 316, no. 2 (1996): 389–93. http://dx.doi.org/10.1042/bj3160389.

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Transfer of the phosphate group of 2-carboxy-D-arabinitol 1-phosphate (CA1P) to 14C-labelled 2-carboxy-D-arabinitol (CA) was catalysed by extracts from leaves of Phaseolus vulgaris. This phosphotransferase activity co-purified with CA1P phosphatase, described previously. This activity was increased, up to 16-fold, by addition of bicarbonate ions at pH 9–10, suggesting rate enhancement by enzyme carbamylation. A Vmax of 1.5 μmol/min per mg of protein and a Km (for CA) of 1.8 mM were estimated for the exchange reaction, with the purified phosphatase. 2-Carboxy-D-arabinitol 1,5-bisphosphate and 2

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7

Füleky, György. "Phosphorus Supply of Typical Hungarian Soils." Agrokémia és Talajtan 55, no. 1 (2006): 117–26. http://dx.doi.org/10.1556/agrokem.55.2006.1.13.

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The new hot water percolation (HWP) method was introduced to determine the phosphorus supply of soils from the Soil Bank of 36 Hungarian soils. The present work aimed to explain the availability of phosphorus by determining the inorganic phosphate fractions and using ryegrass test plants. Four inorganic phosphate fractions were distinguished: Fraction I, the sorbed phosphates; Fraction II, the easily soluble Ca phosphates and the Al bound phosphates; Fraction III, the Fe phosphates; and Fraction IV, the hardly soluble Ca phosphates. Fraction II, in which the easily soluble Ca phosphates and Al

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8

Wójcik, Natalia Anna, Polina Sinitsyna, Sharafat Ali, Leena Hupa, and Bo Jonson. "In Vitro Dissolution of Na-Ca-P-Oxynitrides." Materials 14, no. 23 (2021): 7425. http://dx.doi.org/10.3390/ma14237425.

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Sodium-calcium-phosphate based oxynitride glasses and glass-ceramics doped with Mg, Si, and Nb were studied in vitro in simulated body fluid (SBF) under static conditions. The release of ions and pH changes up to 7 days of immersion were investigated. The nitrogen incorporation into phosphate glass matrix was found to notably influence in vitro dissolution only of homogenous glasses. Increasing the nitrogen content in the samples decreased the mean mass loss, while the niobate incorporation increased it. The correlation between the nitrogen content and increase in pH of SBF was also observed.

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Leng, Yang, Ren Long Xin, and Ji Yong Chen. "A Comparative Study of Bioceramics In Vitro and In Vivo." Key Engineering Materials 284-286 (April 2005): 11–14. http://dx.doi.org/10.4028/www.scientific.net/kem.284-286.11.

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Bioactive calcium phosphate (Ca-P) formation in bioceramics surfaces in simulated body fluid (SBF) and in rabbit muscle sites was investigated. The examined bioceamics included most commonly used bioglass®, A-W glass-ceramics and calcium phosphates in orthopedic and dental applications. The Ca-P cyrstal structures were examined with single crystal diffraction patterns in transmission electron microscopy, which reduced possibility of misidentifying Ca-P phases. The experimental results show that capability of Ca-P formation considerably varied among bioceramics, particularly in vivo. Octacalciu

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10

Possenti, Elena, Claudia Conti, G. Diego Gatta, Marco Realini, and Chiara Colombo. "Diammonium Hydrogenphosphate Treatment on Dolostone: the Role of Mg in the Crystallization Process." Coatings 9, no. 3 (2019): 169. http://dx.doi.org/10.3390/coatings9030169.

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The diammonium hydrogenphosphate (DAP, (NH4)2HPO4) reaction with calcite has been extensively investigated. The availability of free calcium ions in the reaction environment has been acknowledged as a crucial factor in the crystallization of calcium phosphates with a high (hydroxyapatite, Ca/P 1.67) or low Ca/P molar ratio (dicalcium phosphate dihydrate, Ca/P 1.00; octacalcium phosphate, Ca/P 1.33). On the contrary, no data are available on the DAP interaction at room temperature with dolomite in terms of reaction mechanism and composition of the reaction products. Here, a multi-analytical app

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11

Wang, Rui Bing, Wen Jian Weng, Xu Liang Deng, et al. "Dissolution Behavior of Submicron Biphasic Tricalcium Phosphate Powders." Key Engineering Materials 309-311 (May 2006): 223–26. http://dx.doi.org/10.4028/www.scientific.net/kem.309-311.223.

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Submicron α-tricalcium phosphate (α-TCP), β-tricalcium phosphate (β-TCP) and biphasic α/β-TCP powders were prepared by an amorphous calcium phosphate (ACP) precursor way. For the biphasic TCP powders, primary particle size was 300nm, α-TCP and β-TCP primary particles were homogeneously mixed in the submicron powders. When the TCP powders were soaked in acetate buffer solution with pH 5, the Ca ion concentration in the soaked solutions and the resulting morphology variations were measured and observed. The results showed that the dissolution behavior of the biphasic TCP powders was different fr

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12

Labgairi, K., A. Borji, M. Kaddami, and A. Jourani. "Kinetic Study of Calcium Phosphate Precipitation in the System H3PO4-Ca(OH)2-H2O at 30°C." International Journal of Chemical Engineering 2020 (November 10, 2020): 1–9. http://dx.doi.org/10.1155/2020/2893298.

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The precipitation kinetics of calcium phosphates, namely, hydroxyapatite (HAP), dicalcium phosphate dihydrate (DCPD), dicalcium phosphate anhydrous (DCPA), and monocalcium phosphate monohydrate (MCPM), were studied at 30°C by mixing calcium hydroxide, water, and phosphoric acid. The studied mixture was selected according to the stability domain of different calcium phosphates by referring to the phase diagram of the ternary system of H3PO4-Ca(OH)2-H2O at 30°C. The precipitation reaction has been monitored by following the changes in the conductivity, pH, and calcium concentration. The solid ph

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13

Wutthipattarathorn, Kamyaporn, Usarat Thawornchaisit, and Suwannee Janyapoon. "Enhanced Removal of Phosphorus from Aqueous Solutions by Cation-Modified Hydrochar." Trends in Sciences 20, no. 10 (2023): 5808. http://dx.doi.org/10.48048/tis.2023.5808.

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In this study, cassava stem-derived hydrochar was modified with sodium hydroxide (NaOH) treatment, followed by loading of minerals, was used to prepare cation-modified hydrochars with enhanced phosphate removal ability. Cassava stems were converted to hydrochar by hydrothermal carbonization at 240 °C for 60 min, then it was soaked in 2 M NaOH for 3 h. The NaOH-treated hydrochars were then loaded with iron (Fe), magnesium (Mg) and calcium (Ca). The cassava stems and the derived hydrochars were analyzed for carbon, hydrogen, nitrogen and oxygen content, surface morphology and elemental compositi

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14

Jensen, Manfred, Guido B. Feige, and Anna Waterkotte. "Mannitol-1-Phosphate Dehydrogenase in Pseudevernia Furfuracea." Lichenologist 23, no. 2 (1991): 187–96. http://dx.doi.org/10.1017/s0024282991000336.

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AbstractMannitol-1-phosphate dehydrogenase [EC 1.1.1.17] activity was demonstrated in extracts of Pseudevernia furfuracea and Hypogymnia physodes. The reaction was found to be highly substrate specific for fructose-6-phosphate/NADH or mannitol-1-phosphate/NAD+. The pH optimum for fructose-6-phosphate reduction was 7.1, and apparent Km values were 1.2 mM for fructose-6-phosphate and 20 μM for NADH. The reaction did not require Mg++ or Ca++. For conversion of mannitol-1-phosphate into mannitol, the occurrence of mannitol-1-phosphatase in Pseudevernia furfuracea is postulated.

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15

Dorozhkin, Sergey V., Elena I. Dorozhkina, Faik N. Oktar, and S. Salman. "A Simplified Preparation Method of Silicon-Substituted Calcium Phosphates According to Green Chemistry Principles." Key Engineering Materials 330-332 (February 2007): 55–58. http://dx.doi.org/10.4028/www.scientific.net/kem.330-332.55.

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A simplified preparation method of silicon-substituted calcium phosphates with a very high yield (close to 100%) has been elaborated, according to the principles of Green Chemistry. The technique consists of mixing of crystals of calcium nitrate and ammonium dihydrogen phosphate in the desired proportions, following by addition of the necessary amount of a silicon-containing compound. The homogenous mixture is sintered between 900 and 1200°C. Either a siliconcontaining hydroxyapatite (Si-HA) or a silicon-stabilized tricalcium phosphate (Si-αTCP) can be synthesized, depending on the Ca/P, Ca/(P

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16

Wang, Qiang, Lili Tan, Qiang Zhang, Jianhong Qiu, and Ke Yang. "PRECIPITATION CONTROL AND MECHANICAL PROPERTY OF CALCIUM PHOSPHATE–COATED AZ31B ALLOY FOR BIOMEDICAL APPLICATION." Biomedical Engineering: Applications, Basis and Communications 23, no. 03 (2011): 193–203. http://dx.doi.org/10.4015/s1016237211002529.

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Surface modification is believed to be an effective way to control the biodegradation rate of magnesium alloys and improve their biological properties. In the present work, a calcium phosphate (Ca-P) coating was prepared on the AZ31B magnesium alloy by a chemical deposition method to integrate the mechanical advantages of the magnesium substrate and the good bioactivity of the ceramic coating. It was shown that the coating was mainly composed of magnesium and calcium phosphates. Scanning electron microscope coupled with the energy dispersive spectrum analyses showed that rough and crystallined

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17

Schepens, Marloes A. A., Sandra J. M. ten Bruggencate, Arjan J. Schonewille, Robert-Jan M. Brummer, Roelof van der Meer, and Ingeborg M. J. Bovee-Oudenhoven. "The protective effect of supplemental calcium on colonic permeability depends on a calcium phosphate-induced increase in luminal buffering capacity." British Journal of Nutrition 107, no. 7 (2011): 950–56. http://dx.doi.org/10.1017/s0007114511003977.

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An increased intestinal permeability is associated with several diseases. Previously, we have shown that dietary Ca decreases colonic permeability in rats. This might be explained by a calcium-phosphate-induced increase in luminal buffering capacity, which protects against an acidic pH due to microbial fermentation. Therefore, we investigated whether dietary phosphate is a co-player in the effect of Ca on permeability. Rats were fed a humanised low-Ca diet, or a similar diet supplemented with Ca and containing either high, medium or low phosphate concentrations. Chromium-EDTA was added as an i

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Pagliari, Bruno, Alvaro Baretta, Vincenzo De Cristofaro, et al. "Short Term Effects of Low-Calcium Dialysis Solutions on Calcium Mass Transfer, Ionized Calcium, and Parathyroid Hormone in CAPD Patients." Peritoneal Dialysis International: Journal of the International Society for Peritoneal Dialysis 11, no. 4 (1991): 326–29. http://dx.doi.org/10.1177/089686089101100406.

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Patients on CAPD using calcium carbonate (CaC03) as phosphate binder might benefit from low -calcium (Ca) concentration dialysis solutions; however, no data are available for the effects of this regimen on Ca metabolism. We studied 10 patients on stable CAPD regimens with standard dialysis solutions (Ca 7 mg/dL) who were taking CaC03 to control hyperphosphatemia (mean daily doses 4.5±2.4 g). Hypercalcemic episodes had been recorded in 6 patients. Standard dialysis solutions were replaced with solutions containing 5 mg/dL of Ca. Calcium and phosphate peritoneal mass transfer (MT), serum concent

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Lorenc-Kubis, I., and B. Morawiecka. "Phosphatase activity of Poa pratensis seeds. I. Preliminary studies on acid phosphatase II." Acta Societatis Botanicorum Poloniae 42, no. 3 (2015): 369–77. http://dx.doi.org/10.5586/asbp.1973.028.

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Acid phosphatase (EC 3.1.3.2) was extracted with 0.1 M sodium acetate buffer pH 5.1 from <i>Poa pratensis</i> seeds, and separated into three fractions by chromatography on DEAE cellulose. The highest activity was found in fraction Il-b (acid phosphatase II). The activity of the enzyme was optimal at pH 4.9. It hydrolyzed p-nitrophenyl phosphate most readily among the various phosphomonoesters examined. Acid phosphatase II showed also a high activity toward β-naphtyl phosphate and phenyl phosphate, very low activity towards β-glycero phosphate, 5'-GMP and no activity with glucose-1

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ten Bruggencate, Sandra J. M., Johannes Snel, Margriet H. C. Schoterman, et al. "Efficacy of various dietary calcium salts to improve intestinal resistance to Salmonella infection in rats." British Journal of Nutrition 105, no. 4 (2010): 489–95. http://dx.doi.org/10.1017/s0007114510003764.

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Previous animal and human studies have shown protective effects of Ca on the resistance to enteropathogenic infections. Most interventions were performed with calcium phosphate and little is known about the protective effect of other dietary sources of Ca. Therefore, we investigated the efficacy of several Ca salts to enhance intestinal resistance to Salmonella enteritidis infection. Rats (n 7–8 per group) were fed a high-fat, Western human-style, purified diet with a low Ca content (20 mmol calcium phosphate/kg; negative control group) or the same diet supplemented with either (extra) calcium

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Kondo, Daisuke, Tomohiko Yoshioka, Toshiyuki Ikoma, Kensuke Takamatsu, Kunihiro Ohta, and M. Tanaka. "Electrolytic Deposition of Calcium Phosphates Films on Nitinol Stents." Key Engineering Materials 529-530 (November 2012): 243–46. http://dx.doi.org/10.4028/www.scientific.net/kem.529-530.243.

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Calcium phosphates films were deposited onto pipes and stents of nitinol alloys by an electrolytic deposition (ELD) method. Monocalcium phosphate (Ca (H2PO4)2·H2O) solutions were used as the electrolyte, and electric depositions were carried out at the constant cathode current of 1.59 mA/cm2 at 65°C for 60 min. From the deposition on nitinol pipes, deposition rates were changed in 15 minutes and the precipitates were identified to be octacalcium phosphate (Ca8H2(PO4)6·5H2O) and dicalcium phosphate anhydrous (CaHPO4). The electrolytic depositions on the nitinol alloys were useful for the format

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Safronova, Tatiana, Grigorii Grigorev, Tatiana Shatalova, Ilya Roslyakov, Vadim Platonov та Dinara Khayrutdinova. "Microporous Ceramics Based on β-Tricalcium Phosphate". Ceramics 5, № 4 (2022): 1269–85. http://dx.doi.org/10.3390/ceramics5040090.

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Microporous ceramic material, based on β-tricalcium phosphate β-Ca3(PO4)2 with grain size 2–5 μm, pore size smaller than 10 mm, and density 1.22 g/cm3 corresponding to ~40% of the theoretical density (3.07 g/cm3) of β-Ca3(PO4)2, was obtained from a powder mixture with a given molar ratio Ca/P = 1.5 after firing at 1100 °C. A homogenized powder mixture of synthetic dicalcium hydrogen phosphates with the molar ratio Ca/P = 1 and calcium citrate tetrahydrate Ca3(C6H5O7)2·4H2O with the molar ratio Ca/P = ∞ was used for microporous ceramic preparation. The phase composition of calcium phosphate pow

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Dorofeev, Alexander, Anna Pelevina, Yuri Nikolaev, et al. "Oxygen Uptake Rate as an Indicator of the Substrates Utilized by Candidatus Accumulibacter." Water 15, no. 20 (2023): 3657. http://dx.doi.org/10.3390/w15203657.

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Candidatus Accumulibacter belongs to phosphate-accumulating organisms (PAOs) which exhibit a cyclic metabolism and are capable of intracellular polyphosphate accumulation and their hydrolysis under feast-famine anaerobic-aerobic cycling. In consortia of activated sludge microorganisms, these bacteria are responsible for enhanced biological phosphorus removal (EBPR). The spectrum of the substrates used by Ca. Accumulibacter remains insufficiently studied. It was investigated by measuring the oxygen uptake rates (OUR) of Ca. Accumulibacter-enriched culture supplemented with 17 different organic

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Liu, Xu, Yushan Li, Hao Zhou, et al. "Phosphate Removal by Ca-Modified Magnetic Sludge Biochar Prepared by a One-Step Hydrothermal Method." Catalysts 13, no. 6 (2023): 927. http://dx.doi.org/10.3390/catal13060927.

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The problem of phosphorus pollution and its resource utilization has been a source of general concern. The preparation of green, renewable, and non-secondary pollution adsorbents has become a research direction. In this paper, a one-step hydrothermal preparation method of Ca-modified magnetic sludge biochar (Ca-MSBC) is used for enhancing phosphate removal. The results show that the adsorption rate of phosphate by Ca-MSBC is mainly controlled by chemisorption but is also related to physical adsorption and an internal diffusion mechanism. The maximum phosphorus adsorption capacity of Ca-MSBC wa

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Litwin, Anna, Jolanta Bugajska, Joanna Berska, and Krystyna Sztefko. "Basic serum biochemical parameters in the assessment of calcium-phosphate metabolism in children." Diagnostyka Laboratoryjna 56, no. 1 (2020): 5–10. http://dx.doi.org/10.5604/01.3001.0014.3606.

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Introduction: The calcium-phosphate homeostasis is important for proper child growth and development and vitamin D plays a crucial role in this process. Aim: The aim of the study was to assess the relationship between total calcium (Ca), phosphates (Pi), parathyroid hormone (PTH) and the concentration of 25-hydroxycholecalciferol (25 (OH) D3) in children. Materials and methods: 164 serum samples were collected from children (1 day to 18 years) hospitalized in University Children’s Hospital in Krakow. Concentrations of Ca, Pi (dry chemistry-method), PTH (immunoradiometric-method) and 25(OH)D3 (

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Lizoul, Brahim, Fouzia Kzaiber, Fouad Bentiss, and El Mamoune Zahidi. "RETENTION OF CU(II) IONS BY AMORPHOUS AND APATITIC TRICALCIUM PHOSPHATES: AN UNDEMANDING ROUTE TO PRODUCE LIBETHENITE." Journal of Southwest Jiaotong University 56, no. 6 (2021): 891–903. http://dx.doi.org/10.35741/issn.0258-2724.56.6.78.

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The retention of copper ions by amorphous and apatitic tricalcium phosphates was studied using X-ray photoelectron spectroscopy, X-ray diffraction, infrared spectroscopy, and induction-coupled plasma atomic emission spectroscopy. The experimental results of this study show that the amorphous tricalcium phosphate exposed for 48 hours to a 2.10-2 M copper ion solution with the initial molar ratio Cu(solution)/Ca(phosphate) = 1 retains 96% of the initial amount of copper. It also completely converts to copper hydroxyphosphate, the mineral known as libethenite. The research revealed that apatitic

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Aoki, Takayoshi. "Incorporation of individual casein constituents into casein aggregates cross-linked by colloidal calcium phosphate in artificial casein micelles." Journal of Dairy Research 56, no. 4 (1989): 613–18. http://dx.doi.org/10.1017/s0022029900029137.

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SummaryArtificial casein micelles were prepared at a casein concentration of 2·5% with 10–40 mM-Ca, 12–27 mM-phosphate and 10 mM-citrate and cross-linking of casein by colloidal Ca phosphate (CCP) was examined. No casein aggregates cross-linked by CCP were formed at 10 mM-Ca, 12 mM-phosphate and 10 mM-citrate, which are the approximate concentrations found in the soluble phase of bovine milk. Although the amounts of casein aggregates cross-linked by CCP and of colloidal inorganic phosphate increased with increasing Ca and phosphate concentrations, the effect was not uniform. The incorporation

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Floriano-Silva, Daiara, Nelson Heriberto Almeida Camargo, Camila Thais Mamani, Priscila Ferraz Franczak, Marli Baltazar Roesler Eckstein, and Maicon Douglas Possamai. "Part II - Microstructural and Physical of Calcium Phosphate Biomaterials Obtained from Natural Raw Materials." Materials Science Forum 881 (November 2016): 147–52. http://dx.doi.org/10.4028/www.scientific.net/msf.881.147.

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Calcium phosphate bioceramics obtained from raw materials are potential bone substitutes in orthopedic and dental applications. Calcium phosphates attained from calcareous shells using wet methods provide an interconnected microporous framework, shown to be promising and contribute to cell adhesion and proliferation. This study aimed to characterize three different calcium phosphate ratio compositions: (i)1.4, (ii)1.6 and (iii)1.7 molar, sintered for 2 hours at 1100°C and 1200°C. Scanning electron microscopy field effect [FEG] and confocal were used to assess microstructural characterization a

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GOZALIAN, AFSANEH, ALI ASGHAR BEHNAMGHADER, and ARASH MOSHKFOROUSH. "CRYSTAL ANALYSIS OF MULTI PHASE CALCIUM PHOSPHATE NANOPARTICLES CONTAINING DIFFERENT AMOUNT OF MAGNESIUM." International Journal of Modern Physics: Conference Series 05 (January 2012): 196–203. http://dx.doi.org/10.1142/s2010194512002024.

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In this study, Mg doped hydroxyapatite [( Ca , Mg )10( PO 4)6( OH )2] and β-tricalcium phosphate nanoparticles were synthesized via sol gel method. Triethyl phosphite, calcium nitrate tetrahydrate and magnesium nitrate hexahydrate were used as P , Ca and Mg precursors. The ratio of ( Ca + Mg )/ P and the amount of magnesium ( x ) were kept constant at 1.67 and ranging x = 0 up to 3 in molecular formula of Ca 10- x Mg x ( PO 4)6( OH )2, respectively. Phase composition and chemical structure were performed using X-ray Diffraction (XRD) and Fourier Transform Infrared Spectroscopy (FT-IR). Phase p

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Sukhanov, M. V., I. A. Schelokov, V. I. Pet'kov, et al. "Synthesis, Structure and Thermophysical Properties of Phosphates MNi0.5Zr1.5(PO4)3 (M = Mg, Ca, Sr)." Eurasian Chemico-Technological Journal 12, no. 3,4 (2010): 241. http://dx.doi.org/10.18321/ectj51.

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<p>New phosphates MNi<sub>0.5</sub>Zr<sub>1.5</sub>(PO<sub>4</sub>)<sub>3</sub> (M = Mg, Ca, Sr) were prepared by the precipitating method.<strong><em> </em></strong>Phosphates were characterized using X-ray powder diffraction, IR-spectroscopy and electron microprobe analyses. The crystal structure of phosphates was refined by the Rietveld method. Phosphates CaNi<sub>0.5</sub>Zr<sub>1.5</sub>(PO<sub>4</sub>)<sub>3</sub> and SrNi<sub>0.5</sub>Zr<sub>1.5

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Vecbiskena, Linda, Luigi de Nardo, and Roberto Chiesa. "Nanostructured Calcium Phosphates for Biomedical Applications." Key Engineering Materials 604 (March 2014): 212–15. http://dx.doi.org/10.4028/www.scientific.net/kem.604.212.

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This work is focused on the phase transformation from amorphous calcium phosphate (ACP) to nanostructured hydroxyapatite (HA) or tricalcium phosphate (TCP). Amorphous calcium phosphates with Ca/P molar ratio near 1.67 and 1.5 were synthesized by wet-chemical precipitation method and treated with ethanol. Upon thermal treatment, ACP clusters about 50 nm create a nanostructured HA or TCP. The highlights of this research: The precipitate treatment with ethanol provided a pure α-TCP that was found to be stable up to 1000 °C. HA is obtained from the ACP precursor synthesized using also ammonium dih

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Крутько, Валентина Константиновна, Анна Евгеньевна Дорошенко, Ольга Николаевна Мусская, Сергей Михайлович Рабчинский та Анатолий Иосифович Кулак. "APATITES FORMATION ON ELECTRODEPOSITED CALCIUM PHOSPHATES IN THE Ca(NO3)2 / NH4H2PO4 AND CаCOз / Ca(H2PO4)2 SYSTEMS". Physical and Chemical Aspects of the Study of Clusters, Nanostructures and Nanomaterials, № 13 (23 грудня 2021): 860–69. http://dx.doi.org/10.26456/pcascnn/2021.13.860.

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Методом электрохимического осаждения на титановых пластинах при комнатной температуре в двухэлектродной ячейке при постоянной плотности тока 30 мА/см и времени осаждения 10 мин получены кальцийфосфатные покрытия: брушитные в системе Ca (NO )/ NH H PO при pH = 4 и композитные (брушит/кальцит/апатит) в системе CaCOjCa (HPO ) при pH = 5. Выдерживанием кальцийфосфатных покрытий обоих типов в модельном растворе SBF в течение 1 месяца определяли апатитообразующую способность (биоактивность). Новообразованный аморфизированный апатитовый слой после термообработки при 800°С кристаллизовался в Д -трикал

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Feng, Menghan, Mengmeng Li, Lisheng Zhang, et al. "Oyster Shell Modified Tobacco Straw Biochar: Efficient Phosphate Adsorption at Wide Range of pH Values." International Journal of Environmental Research and Public Health 19, no. 12 (2022): 7227. http://dx.doi.org/10.3390/ijerph19127227.

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In order to improve the phosphate adsorption capacity of Ca-loaded biochar at a wide range of pH values, Ca (oyster shell) was loaded as Ca(OH)2 on the tobacco stalk biochar (Ca-BC), which was prepared by high-temperature calcination, ultrasonic treatment, and stirring impregnation method. The phosphorus removal performance of Ca-BC adsorption was studied by batch adsorption experiments, and the mechanism of Ca-BC adsorption and phosphorus removal was investigated by SEM-EDS, FTIR, and XRD. The results showed that after high-temperature calcination, oyster shells became CaO, then converted int

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Safronova, Tatiana, Anton Kuznetsov, Svetlana Korneychuk, Valery Putlyaev, and Mikhail Shekhirev. "Calcium phosphate powders synthesized from solutions with [Ca2+]/[PO43−]=1 for bioresorbable ceramics." Open Chemistry 7, no. 2 (2009): 184–91. http://dx.doi.org/10.2478/s11532-009-0016-0.

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AbstractCalcium phosphate powders for manufacturing bioceramics were synthesized via precipitation from stock solutions of (NH4)2HPO4 and Ca(NO3)2, or CaCl2 or Ca(CH3COO)2 with [Ca2+]/[PO 43−] = 1, without pH regulation. Properties of powdered samples, including density and microstructure of ceramics sintered at 900, 1000, 1100°C, were studied. The following pairs of precursors such as Ca(NO3)2/(NH4)2HPO4, CaCl2/(NH4)2HPO4, Ca(CH3COO)2/(NH4)2HPO4 gave both insoluble calcium phosphates and the corresponding by-products of synthesis — NH4NO3, NH4Cl, NH4CH3COO. These by-products were released fro

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Duse, Dragos Andrei, Michael Gröne, Nicolas Kramser, et al. "Elevated Initial Serum Phosphate Levels Predict Higher Mortality and Impaired Neurological Outcome in Cardiac Arrest Patients with Return of Spontaneous Circulation." Diagnostics 13, no. 3 (2023): 479. http://dx.doi.org/10.3390/diagnostics13030479.

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Purpose: Although a moderate proportion of cardiac arrest (CA) patients achieve a return of spontaneous circulation (ROSC), few survive to discharge, mostly with poor neurological development. As serum phosphate levels were described as elevated after cardiopulmonary resuscitation (CPR), we asked whether these elevations would predict a higher risk of mortality and impaired neurological outcome in CA patients following ROSC. Methods: Initial serum phosphate levels, survival, and neurologic status at discharge of 488 non-traumatic CA patients treated at a single German hospital after achieving

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Severin, M., J. Breuer, M. Rex, et al. "Phosphate fertilizer value of heat treated sewage sludge ash." Plant, Soil and Environment 60, No. 12 (2014): 555–61. http://dx.doi.org/10.17221/548/2014-pse.

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This study focuses on the question whether heat treated sewage sludge ashes are more favourable as fertilizers than untreated sewage sludge ashes (USSA) and whether their fertilization effects are comparable with commercial triple superphosphate (TSP). In a pot experiment, maize was fertilized either with one of three heat treated and Na-, Ca- and Si-compounds amended sewage sludge ashes (two glown phosphates, steel mill slag + sewage sludge ash) or USSA or TSP as control. Fertilization with USSA did not increase the biomass yield and the P uptake of maize in comparison to the P0 treatment (7.

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Kim, Kyo-Han, Tae-Yub Kwon, Shin-Yoon Kim, et al. "Preparation and Characterization of Anodized Titanium Surfaces and Their Effect on Osteoblast Responses." Journal of Oral Implantology 32, no. 1 (2006): 8–13. http://dx.doi.org/10.1563/741.1.

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Abstract In this study, titanium (Ti) surface was modified by anodizing with a mixture of β-glycerophosphate sodium and calcium (Ca) acetate, and the anodized surfaces were characterized by scanning electron microscopy, X-ray diffraction, and electron probe microanalysis. In vitro osteoblast response to anodized oxide was also evaluated. The anodic oxide produced was observed to have interconnected pores (0.5–2 μm in diameter) and intermediate roughness (0.60–1.00 μm). In addition, anodic oxide was observed to have amorphous and anatase oxide. Calcium and phosphorus ions were deposited on the

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Balgabaev, A. M., B. E. Alimbekova, A. M. Shibikeуeva, Zh B. Bakenova, and G. S. Zhaksybaeva. "Correlation dependence between mineral and organic soil phosphates and sugar beet yield and their changes." Pochvovedenie i agrokhimiya, no. 1 (April 3, 2024): 62–74. http://dx.doi.org/10.51886/1999-740x_2024_1_62.

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The article presents the results of studies on correlations between the productivity of sugar beets and phosphorus, mineral and organic phosphates of soil grown in monoculture conditions and crop rotation on irrigated dark chestnut soil. Fertilizer application in a monoculture increases the amount of mineral phosphates in the range of 691,1-791,2 mg/kg, organic phosphates by 293,2-372,0 mg/kg, and under crop rotation conditions these indicators are 567,4-775,9 mg/kg and 332,5-395,8 mg/kg, respectively. It has been established that the correlations between the yield of sugar beets grown under c

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Vecstaudza, Jana, and Janis Locs. "Effect of Synthesis Temperature and Ca/P Ratios on Specific Surface Area of Amorphous Calcium Phosphate." Key Engineering Materials 721 (December 2016): 172–76. http://dx.doi.org/10.4028/www.scientific.net/kem.721.172.

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Amorphous and low crystalline calcium phosphates are prospective candidates for bone implant manufacturing. Amorphous calcium phosphate (ACP) preparation technologies could be improved in terms of specific surface area (SSA) of obtained products. Current study is dedicated to the effect of synthesis temperature and Ca and P molar ratios (Ca/P) on SSA of ACP. Higher SSA can improve bioactivity of biomaterials. ACP was characterized by XRD, FT-IR, SEM and BET N2 adsorption techniques. Spherical nanoparticles (<45 nm in size) were obtained independently of initial Ca/P ratio and synthesis temp

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Shelobolina, Evgenya S., Hiromi Konishi, Huifang Xu, and Eric E. Roden. "U(VI) Sequestration in Hydroxyapatite Produced by Microbial Glycerol 3-Phosphate Metabolism." Applied and Environmental Microbiology 75, no. 18 (2009): 5773–78. http://dx.doi.org/10.1128/aem.00628-09.

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ABSTRACT Previous studies have demonstrated the potential for removal of U(VI) from solution via precipitation of U(VI)-bearing calcium-phosphate (Ca-P) minerals coupled to microbial hydrolysis of glycerol phosphate compounds. We evaluated this process in circumneutral-pH groundwater from Area 2 of the U.S. Department of Energy Field Research Center at Oak Ridge National Laboratory. Area 2 groundwater contains high concentrations of dissolved calcium (ca. 4 mM), and thus, release of phosphate during glycerol phosphate metabolism has the potential to create conditions favorable for U(VI) seques

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Wang, Pengfei, Mengmeng Zhi, Guannan Cui, Zhaosheng Chu, and Shuhang Wang. "A comparative study on phosphate removal from water using Phragmites australis biochars loaded with different metal oxides." Royal Society Open Science 8, no. 6 (2021): 201789. http://dx.doi.org/10.1098/rsos.201789.

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Metal oxide-loaded biochars are a promising material to remove phosphate from polluted water to ultra-low concentrations. To facilitate preparing the metal oxide-loaded biochar with the best phosphate adsorption performance, five biochars loaded with Al, Ca, Fe, La and Mg oxides, respectively (Al-BC, Ca-BC, Fe-BC, La-BC and Mg-BC) were produced using Phragmites australis pretreated with 0.1 mol AlCl 3 , CaCl 2 , FeCl 3 , LaCl 3 and MgCl 2 , respectively, characterized, and phosphate adsorption kinetics and isotherms of the biochars were determined. The maximum phosphate adsorption capacities (

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Hausrath, E. M., C. T. Adcock, J. A. Berger, et al. "Phosphates on Mars and Their Importance as Igneous, Aqueous, and Astrobiological Indicators." Minerals 14, no. 6 (2024): 591. http://dx.doi.org/10.3390/min14060591.

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This paper reviews the phosphate phases in meteorites and those measured by landed spacecraft, what they reveal about past igneous and aqueous conditions on Mars, and important implications for potential prebiotic chemistry, past habitability, and potential biosignatures that could be detected in samples returned from Mars. A review of the 378 martian meteorites as of 2023 indicate that of the two most common phosphate minerals in Mars meteorites, merrillite and apatites, the apatite composition is largely F- and Cl-rich, with shergottites containing more OH. The phosphate concentrations exami

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Tikhonov, Andrey, and Valery Putlayev. "Synthesis and Thermal Behaviour of Calcium Alkyl Phosphates as Bioceramic Precursors." Ceramics 5, no. 3 (2022): 362–71. http://dx.doi.org/10.3390/ceramics5030028.

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Powders of alkyl phosphoric acids and calcium alkyl phosphates with various alkyl chains (butyl, octyl, and dodecyl) have been synthesized. The resulting powders were characterized by X-ray phase analysis, electron microscopy, and thermal analysis. It was shown that the calcium alkyl phosphates correspond to the composition of acid salts of calcium alkyl phosphates Ca(RPO4H)2, data on which are not presented in the literature. The thermal behaviour of calcium alkyl phosphates can be described as a complex phase transformation into biphasic calcium phosphate mixture (of Ca2P2O7 and Ca3(PO4)2) w

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Amin, Nur Ain Atiqah Mohd, Mohd Akmali Mokhter, Nurrulhidayah Salamun, and Wan M. Asyraf Wan Mahmood. "Phosphate Adsorption from Aqueous Solution Using Electrospun Cellulose Acetate Nanofiber Membrane Modified with Graphene Oxide/Sodium Dodecyl Sulphate." Membranes 11, no. 7 (2021): 546. http://dx.doi.org/10.3390/membranes11070546.

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Eutrophication and water pollution caused by a high concentration of phosphate are two concerning issues that affect water quality worldwide. A novel cellulose-based adsorbent, cellulose acetate/graphene oxide/sodium dodecyl sulphate (CA/GO/SDS), was developed for water treatment. A 13% CA solution in a mixture of acetone:dimethylacetamide (2:1) has been electrospun and complexed with a GO/SDS solution. The field emission scanning electron microscope (FESEM) showed that the CA membrane was pure white, while the CA/GO/SDS membrane was not as white as CA and its colour became darker as the GO co

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Soto Calle, Gloria, Nestor Ricardo Rojas Reyes, Adrián Gómez Zapata, and Sandra Díaz Bello. "Characterization and Processing of Phosphate Rock as a Raw Material for Potential Use as Biomaterials." Ciencia e Ingeniería Neogranadina 35, no. 1 (2025): 11–24. https://doi.org/10.18359/rcin.7311.

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Seventy-five percent of the phosphate rock extracted is used for the production of phosphoric acid. However, during the leaching process, it is also possible to dissolve calcium compounds, allowing for the extraction of phosphorus and calcium ions from the resulting solution. This study focused on the application of hydrometallurgical processes directly to phosphate rock to obtain calcium phosphates with potential applications in the manufacture of biomaterials. After a physicochemical characterization of four phosphate rock samples, one sample was subjected to a hydrometallurgical process usi

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Cave, M. R., David Farrar, and Adrian J. Wright. "Organic/Inorganic Hybrid Calcium Phosphate Biomaterials." Key Engineering Materials 361-363 (November 2007): 383–86. http://dx.doi.org/10.4028/www.scientific.net/kem.361-363.383.

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Calcium alkyl phosphates and their strontium and magnesium analogues were synthesised by the reaction of aqueous metal salts with a range of alkyl phosphates of varying chain length and were characterised by X-ray diffraction, thermogravimetric and FTIR analyses. These hybrid structures are based on alternating organic/metal phosphate regions and were found to exhibit a linear increase in interlayer separation upon increasing the length of the alkyl chain. Our analysis suggests a general formula for these phases of M(ROPO3).nH2O (where M = Ca, Sr, Mg and R = alkyl group), containing alkyl bila

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Lanfranco, A. M., P. F. Schofield, P. J. Murphy, M. E. Hodson, J. F. W. Mosselmans, and E. Valsami-Jones. "Characterization and identification of mixed-metal phosphates in soils: the application of Raman spectroscopy." Mineralogical Magazine 67, no. 6 (2003): 1299–316. http://dx.doi.org/10.1180/0026461036760166.

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AbstractThe development of protocols for the identification of metal phosphates in phosphate-treated, metalcontaminated soils is a necessary yet problematical step in the validation of remediation schemes involving immobilization of metals as phosphate phases. The potential for Raman spectroscopy to be applied to the identification of these phosphates in soils has yet to be fully explored. With this in mind, a range of synthetic mixed-metal hydroxylapatites has been characterized and added to soils at known concentrations for analysis using both bulk X-ray powder diffraction (XRD) and Raman sp

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Teixeira, S., S. M. Oliveira, M. P. Ferraz, and F. J. Monteiro. "Three Dimensional Macroporous Calcium Phosphate Scaffolds for Bone Tissue Engineering." Key Engineering Materials 361-363 (November 2007): 947–50. http://dx.doi.org/10.4028/www.scientific.net/kem.361-363.947.

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Calcium phosphate ceramics are widely used as bone substitutes since they are biocompatible and bioactive. Having a chemical composition close to natural bone, calcium phosphate ceramics are promising bone substitute materials in orthopaedics, maxillofacial surgery and dentistry. Hydroxyapatite (HA) and tricalcium phosphate (TCP) are the most commonly used calcium phosphates, because their calcium/phosphorus (Ca/P) ratios are close to that of natural bone and they are relatively stable in physiological environment. HA is a major constituent of bone materials and is resorbed after a long time o

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Escoubet, B., M. C. Garestier, C. Le Grimellec, and C. Amiel. "Multiple modulation of Na-dependent Pi uptake by cellular Ca in MDCK cells." American Journal of Physiology-Cell Physiology 265, no. 1 (1993): C19—C27. http://dx.doi.org/10.1152/ajpcell.1993.265.1.c19.

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The events accounting for the adaptation of the sodium-dependent phosphate cotransport (Na-Pi) to phosphate deprivation other than genomic regulation remain unknown. The involvement of changes in intracellular calcium concentration was investigated in Madin-Darby canine kidney (MDCK) cells. Calcium concentration was decreased by 15 h of phosphate deprivation (-24 to -35%) or low-calcium medium (calcium deprivation) (-45%), or 8-(N,N'-diethylamino)octyl-3,4,5-trimethoxybenzoate (TMB8) (-32%). Calcium deprivation stimulated Na-Pi (2-fold at 1 h and up to 15 h) by increasing the affinity for phos

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Wang, Enlei, Xiaoan Li, Shujuan Dai, et al. "Increased effectiveness of the flotation separation of hornblende and magnesite by adding citric acid as depressant." Tenside Surfactants Detergents 59, no. 3 (2022): 269–79. http://dx.doi.org/10.1515/tsd-2021-2394.

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Abstract The microflotation experiments were systematically carried out to investigate the inhibitory effect of citric acid (CA) on the flotation behavior of hornblende and magnesite. When the mixture consisted of sodium oleate and dodecyl phosphate was utilized as a mixed trapping reagent, CA could obviously inhibit the hornblende flotation but had little inhibitory effect on magnesite flotation. The desilication of magnesite flotation was accomplished when CA was employed as the hornblende inhibitor. Moreover, to reveal the adsorption mechanism of CA on the surfaces of hornblende and magnesi

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