Calcium phosphate apatites are inorganic compounds encountered in many different mineralized tissues. Bone mineral, for example, is constituted of nanocrystalline nonstoichiometric apatite, and the production of "analogs" through a variety of methods is frequently reported. In another context, the ability of solid surfaces to favor the nucleation and growth of "bone-like" apatite upon immersion...

novamin, a synthetic mineral composed of calcium, sodium, phosphorous and silica releases deposits of crystalline hydroxyl-carbonate apatite (hca) structurally similar to tooth mineral composition. the aim of this investigation was to compare the potential remineralization effect of topical novamin and sodium fluoride gel on caries like lesions in permanent teeth.a total of 60 sound human fresh...

The partial purification of beef thyrotropin with the cation exchangers Amberlite IRC-50 (2, 3) and carboxymethyl (CM) cellulose (3, 4) has been previously reported. The preceding paper (5) describes the rechromatography on diethylaminoethyl (DEAE) cellulose of thyrotropin preparations assaying 20 U.S.P. units per mg which resulted in fractions apparently containing only those glycoproteins wit...

Introduction: Apatite has been extensively studied on Earth because of its geological, geobiological, and materials importance [1], and it is one of the most common mineralogical reservoirs for phosphorus on Earth. Apatite is also present in each of the three types of SNC meteorites, implying the same may also be true for Mars. In addition to phosphorus, apatite commonly contains some combinati...

INTRODUCTION NovaMin is a synthetic mineral compound composed of calcium, sodium, phosphorus, and silica. It releases crystalline hydroxyl-carbonate apatite (HCA), which structurally resembles the minerals naturally found in the teeth. Nano-hydroxyapatite (NHA) is a biocompatible compound with high affinity for tooth enamel. NHA particles morphologically resemble dental enamel apatite crystals....

B-type synthetic carbonate hydroxyapatite (CHAp), natural carbonate fluorapatite (CFAp) and silicon-substituted hydroxyapatite (SiHAp) have been studied by using micro-Raman and infrared (IR) spectroscopy. It was found that while B-type carbonate substitution predominates in carbonate apatites (CAps), A-type is also detected. B-type carbonate substitution causes a broadening of the v(1) P-O str...

Various carbonate apatite formulae contribute to discrete cuticle structures participating in protective functions of the American lobster, Homarus americanus, integument. Canal walls use their lowest Calcium : Phosphate (Ca:P) ratios to protect exposed surfaces of gland and neuronal canals. The linings insulate more soluble calcium carbonate from attack by acid secreting micro-organisms. A tra...