Modeling of the synthesis conditions impact on the structure of calcium magnesium phosphates

2021 ◽  
Vol 267 ◽  
pp. 124627
Author(s):  
Natalja Kitikova ◽  
Andrei Ivanets ◽  
Irina Shashkova ◽  
Artsemi Shareiko
Keyword(s):  
Synthesis Conditions ◽  
Calcium Magnesium ◽  
Magnesium Phosphates

State of water in amorphous calcium and calcium-magnesium phosphates

2008 ◽  
Vol 78 (5) ◽  
pp. 864-867 ◽  
Author(s):  
V. A. Sinyaev ◽  
R. Z. Le Geros ◽  
L. V. Levchenko ◽  
E. S. Shustikova ◽  
R. A. Karzhaubaeva
Keyword(s):  
State Of Water ◽  
Calcium Magnesium ◽  
Magnesium Phosphates

Calcium magnesium phosphate granules: atomistic simulations explaining cell death.

1994 ◽  
Vol 190 (1) ◽  
pp. 131-139
Author(s):  
K Simkiss ◽  
M G Taylor
Keyword(s):  
Cell Death ◽  
Computer Simulations ◽  
Atomistic Simulations ◽  
Cell Physiology ◽  
Interatomic Potentials ◽  
Granule Formation ◽  
Crystal Lattices ◽  
Calcium Magnesium ◽  
Lattice Energies ◽  
Magnesium Phosphates

1. A large number of invertebrates have cells that produce intracellular granules of amorphous calcium magnesium phosphates that are thought to act as ion stores or sites of metal detoxification. 2. The interatomic potentials and force constants have been calculated for these ions, and computer simulations of the crystal lattices have been used to determine the effects of ion substitutions on these lattice energies. 3. The results provide insights into the mechanisms of granule formation and the effects of ion substitutions on cell physiology.

Magnesium phosphates as dietary supplements for growing sheep

1973 ◽  
Vol 81 (3) ◽  
pp. 441-444 ◽  
Author(s):  
G. Fishwick ◽  
R. G. Hemingway
Keyword(s):  
Dietary Supplements ◽  
Magnesium Oxide ◽  
Dicalcium Phosphate ◽  
Magnesium Phosphate ◽  
Similar Degree ◽  
Low Phosphorus ◽  
Calcium Magnesium ◽  
Magnesium Phosphates

SUMMARYGrowing wether sheep in metabolism cages were fed a low phosphorus diet (0·75g P/day) supplemented with 1·75 g P/day as either a magnesium phosphate (20·0% Mg, 18·5% P) or a calcium magnesium phosphate (16·1% Ca, 6·0% Mg, 18·5% P). In addition, the magnesium phosphate provided 1·87 g Mg/day and the calcium magnesium phosphate 0·57 g Mg/day. In each case comparisons were made with equivalent amounts of phosphorus and magnesium supplied as dicalcium phosphate (26·5% Ca, 16·0% P) and magnesium oxide (60·0% Mg).All the supplements resulted in similar positive phosphorus retentions of between 0·77and 0·92 g P/day compared with a daily loss of 0·17 g P/day for the low phosphorus diet. Calcium retentions were higher (1·40 and 1·70 g Ca/day) whendicalcium phosphate rather than the magnesium phosphates (1·16 g Ca/day) were given. Magnesium retentions were increased from 0·1 g Mg/day (unsupplemented) to 0·3–0·4 gMg/day and were similar for both magnesium oxide and the magnesium phosphates.Blood phosphorus and magnesium concentrations were increased to a similar degree by all forms of supplementation.

scholarly journals ASSESSMENT OF WATER QUALITY (PHYSICO-CHEMICAL) OF KANEKAL TANK, ANANTAPURAMU DIST., AP, INDIA.

1970 ◽  
pp. 08-15
Author(s):  
PHILIP HAROLD GUNDALA ◽  
JAYARAM NAIK V N ◽  
VENKATA RAMANAIAH KOLALA
Keyword(s):  
Water Quality ◽  
Domestic Sewage ◽  
Total Hardness ◽  
Chemical Parameters ◽  
Standard Methods ◽  
Physico Chemical ◽  
Free Carbon Dioxide ◽  
Calcium Magnesium ◽  
Tank Water ◽  
Magnesium Phosphates

Abstract: Different Physico-chemical parameters of Kanekal tank water, Kanekal were estimated from October 2012 to September 2014 to assess its quality. The different parameters like Temperature, pH, TDS, conductivity, salinity, dissolved oxygen, turbidity, alkalinity, free carbon dioxide, chloride, total hardness, calcium, magnesium, phosphates, sulphates, silicates, nitrites, nitrates, BOD and COD were carried out by standard methods. These parameters showed either positive or negative correlation between each other. The analysis revels these parameters are interrelated with each other. From the data it can be said that water of this tank is partially contaminated with human faeces, domestic sewage etc. Hence it is not good quality for culture of fish as well as drinking for animals.Keywords –Kanekal Tank, water quality, Physico-chemical parameters, BOD, COD

Nature and Thermal Behavior of Precipitated Calcium-Magnesium Phosphates

2003 ◽  
Vol 76 (9) ◽  
pp. 1375-1378 ◽  
Author(s):  
V. A. Sinyaev ◽  
E. S. Shustikova ◽  
L. V. Levchenko ◽  
G. A. Tokseitova ◽  
D. Griggs
Keyword(s):  
Thermal Behavior ◽  
Calcium Magnesium ◽  
Magnesium Phosphates

The Nature of P-O Bonds in the Precipitated Amorphous Calcium Phosphates and Calcium Magnesium Phosphates

2005 ◽  
Vol 31 (5) ◽  
pp. 671-675 ◽  
Author(s):  
V. A. Sinyayev ◽  
E. S. Shustikova ◽  
D. Griggs ◽  
D. V. Dorofeev
Keyword(s):  
Calcium Phosphates ◽  
Calcium Magnesium ◽  
Magnesium Phosphates

Catalysts for hydrogenation of CO2 into components of motor fuels

2020 ◽  
pp. 1-18
Author(s):  
Yu.V. Bilokopytov ◽  
◽  
S.L. Melnykova ◽  
N.Yu. Khimach ◽  
◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Heterogeneous Catalysts ◽  
Fossil Fuels ◽  
Catalyst Stability ◽  
Co2 Conversion ◽  
Active Components ◽  
Synthesis Conditions ◽  
Hydrogenation Of Co2 ◽  
Mesoporous Zeolites ◽  
Motor Fuels

CO2 is a harmful greenhouse gas, a product of chemical emissions, the combustion of fossil fuels and car exhausts, and it is a widely available source of carbon. The review considers various ways of hydrogenation of carbon dioxide into components of motor fuels - methanol, dimethyl ether, ethanol, hydrocarbons - in the presence of heterogeneous catalysts. At each route of conversion of CO2 (into oxygenates or hydrocarbons) the first stage is the formation of CO by the reverse water gas shift (rWGS) reaction, which must be taken into account when catalysts of process are choosing. The influence of chemical nature, specific surface area, particle size and interaction between catalyst components, as well as the method of its production on the CO2 conversion processes is analyzed. It is noted that the main active components of CO2 conversion into methanol are copper atoms and ions which interact with the oxide components of the catalyst. There is a positive effect of other metals oxides additives with strong basic centers on the surface on the activity of the traditional copper-zinc-aluminum oxide catalyst for the synthesis of methanol from the synthesis gas. The most active catalysts for the synthesis of DME from CO2 and H2 are bifunctional. These catalysts contain both a methanol synthesis catalyst and a dehydrating component, such as mesoporous zeolites with acid centers of weak and medium strength, evenly distributed on the surface. The synthesis of gasoline hydrocarbons (≥ C5) is carried out through the formation of CO or CH3OH and DME as intermediates on multifunctional catalysts, which also contain zeolites. Hydrogenation of CO2 into ethanol can be considered as an alternative to the synthesis of ethanol through the hydration of ethylene. High activation energy of carbon dioxide, harsh synthesis conditions as well as high selectivity for hydrocarbons, in particular methane remains the main problems. Further increase of selectivity and efficiency of carbon dioxide hydrogenation processes involves the use of nanocatalysts taking into account the mechanism of CO2 conversion reactions, development of methods for removing excess water as a by-product from the reaction zone and increasing catalyst stability over time.

Epoxy-titania composites of cationic polymerization: synthesis conditions and properties

2015 ◽  
Vol 37 (4) ◽  
pp. 402-407
Author(s):  
S.V. Zhil’tsova ◽  
◽  
V.M. Mikhal’chuk ◽  
N.G. Leonova ◽  
R.I. Lyga ◽  
...  
Keyword(s):  
Cationic Polymerization ◽  
Synthesis Conditions
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