Phosphates, modified calcium

Fischl J, Schwartz F. Modified calcium base reagent for simultaneous determination of serum calcium and inorganic phosphate with the Autoanalyzer. ... 

Interaction of PTH, calcitonin, and serum concentrations of calcium and phosphate in calcium and phosphate homeostasis. [Modified and reproduced, with permission, from A. W. Norman, Vitamin D The Calcium Homeostatic Hormone. Academic Press, New York, 1979.]... 

F27. Fraenkel, H. H., and Peters, R. L., A modified calcium-cobalt method for the demonstration of alkaline phosphatase. The use of para-nitrophenyl phosphate as a substrate. Am. J. Clin. Paihol. 42, 324-327 (1964). 

Figure 12. Solubility iso-therms of ealcium ortho-phosphate phases in the sys-tem Ca(0H)2-H3P04-H20 at 37 C (equimolar calcium and phosphate). [Modified after Elliott (1994).]...

A novel material made of biodegradable polymer reinforced with modified calcium phosphates (TCP) particles will be proposed to be used in fabrication of novel constructs for the repair of critical-sized bone defects. Several composite materials made of PLLA/PDLA or PCL reinforced with TCP micro and nanoparticles will be discussed. 

Nontraditional oxidation catalysts have also been shown to be highly effective for methanol ammoxidation. An example of this is the use of manganese phosphate modified by potassium, calcium, molybdenum, zinc, and/or iron (100). The modifying elements are added to the preformed and calcined manganese phosphate by wet impregnation. The yields of HCN from methanol were reported to be between 81% and 93%. 

HEK293T cells, grown until 60-80% confluence in 10-cm cell culture dishes, are transiently transfected using a modified calcium phosphate method (similar to the commercial MBS kit from Stratagene, La Jolla, CA). For transfection of each dish, a total of 15 //g of plasmid DNA (4 /ig... 

These organophosphates were used to coat both precipitated and ground calcium carbonates, and the coated fillers were assessed in SBR and EPDM elastomers. Coating was by adding an aqueous or organic solution of the phosphate modifier to an aqueous... 

The hydration products formed in the systems described above were x-ray amorphous. Hydrothermal treatment of the calcium phosphate-modified OPC resulted in the formation of crystalline hydroxyapatite. 

For production of commercial 50% solution and for recovery of crystalline cyanamide, this process is modified to improve purity and concentration. Calcium and iron may be removed by ion-exchange treatment. The commercial 50% solution is stabilized at pH 4.5—5.0 with 2% monosodium phosphate and contains less than 1.5% dicyandiamide and 0.2% urea. Such solutions are expected to show less than 1% change ia cyanamide content per month of storage below 10°C. It is advisable, however, to adjust the pH periodically duriag extended storage. Organic esters may be used iastead for improved stabihty (23). 

Small amounts of modified methylcellulose and mono-substituted sodium phosphate (both 0.1%), may be added to plugging cement [1766]. The mono-substituted sodium phosphate weakens the effect of calcium ions on modified methylcellulose and prevents its coagulation. Stabilization of the plugging solution and increased strength of the cement rock result. 

Figure 4 Schematic representation of the Ca2+-transporting systems affecting cellular calcium homeostasis during hormonal stimulation, oq = oq-adrenergic receptor VP = vasopressin receptor PLC = phospholipase C PI = phosphatidylinositol PIP = phospha-tidylinositol-4-phosphate PIP2 = phosphatidylinositol-4,5-biphosphate IP3 = inositol-1,4,5-triphosphate DG = diacylglycerol PKC = protein kinase C. (Modified from Refs. 125 and 285.)...

Dulbecco s modified phosphate-buffered saliue (PBS) without calcium chloride aud maguesium chloride (Pierce Biotechuology, Rockford, IL). 

Phosphate and phosphonate molecules have a very high affinity for calcium carbonate surfaces, as shown by their influence on the precipitation and growth of calcite [164-166]. Accordingly, organophosphorus compounds such as alkylphosphoric acids [167-169] and phosphonic acid-terminated polyoxyethylene [170, 171] have been used to modify the surface of CaCOs powders. 

Patel et al. [40] found that moismre and the pH of the micro-environment influenced degradation the most. They identified the best diluent for tablet manufacture as being dibasic calcium phosphate, with a basic modifier (sodium carbonate, sodium bicarbonate or magnesium oxide). The authors indicated that the degradation pathways observed were deiodination, deamination and decarboxylation. The data are shown in Table 2.4. 

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