Crystalline Intermediates in the Hydrolytic Degradation of Calcium Polymetaphosphate

Crystals, joints, and consternation.

“…at the National Fertilizer Center, Muscle Shoals, Alabama. 7 We then methodically screened joint fluids for crystals by compensated polarised light and added phase-contrast optics for added sensitivity. Pellets of fluid containing nonurate crystals were treated as outlined above and examined by x-ray diffraction.…”

“…Normal cartilage showed little alkaline phosphatase and absent PPiase activities. Recent work by Howell 7 Enzymes identified in cartilage by Howell and coworkers in detergent extracts ofsamples obtained at surgery. Nucleoside triphosphate pyrophosphohydrolase (NTPPiase) and 5' nucleotidase (S'NTase) activities were increased and inorganic pyrophosphatase (PPiase) activity was decreased in degenerated cartilage associated with CPPD crystal deposits as compared with degenerated cartilage without crystals.80 Adenine, guanine, inosine, and uridine nucleoside triphosphates were all effective substrates for NTPPiase.…”

Fertilizer Materials, Vitreous Calcium Metaphosphate-Some Properties of Its Aqueous Systems

“…The products appeared to be clear glasses, but petrographic examination showed that they sometimes contained very small amounts of crystalline /3-calcium metaphosphate. The mole ratio P:Ca (P2Os:CaO) ranged from 1.980 to 2.044 (0.990 to 1.022), and the sum of the calcium and phosphorus contents ranged from 51.43 to 51.54% (CaO + P205, 99.83 to 100.04%).…”

Alkaline Earth Phosphates.

“…Recently the calcium pyrophosphates have been carefully reinvestigated, resulting in the isolation of several new compounds (37,38). It is expected that further work will result in a clearer understanding of the chemistry of pyrophosphates.…”

“…mole-1, the average of two values obtained from a study of the system Ca0-Al203-P206 (191). Using these data, equations [34][35][36][37][38][39][40][41][42][43] for the molal thermodynamic functions were derived (59).…”