نتایج جستجو برای: p ca10
تعداد نتایج: 1269879 فیلتر نتایج به سال:
PURPOSE Previous studies have identified novel genetic variants associated with age at menarche in females of European descent. The pubertal growth effects of these variants have not been carefully evaluated in non-European descent groups. We aimed to examine the effects of 31 newly identified menarche-related single-nucleotide polymorphisms (SNPs) on growth outcomes in African-American (AA) an...
Thermal Stability of Iron- and Silicon-Substituted Hydroxyapatite Prepared by Mechanochemical Method
In this study, hydroxyapatite with the substitution of calcium cations by iron and phosphate silicate groups was synthesized via a mechanochemical method. The as-prepared compounds have general formula Ca10−xFex(PO4)6−x(SiO4)x(OH)2−xOx/2 x = 0–1.5. thermal stability studied ex situ annealing powders in furnace. It has been established that, at 800 °C for ≤ 0.5, partial decomposition substituted...
Tetracalcium phosphate (TTCP) Ca4(PO4)2O is one of the major powder components of self-setting orthopedic and dental cements. Traditionally, TTCP powders are produced by a solidstate process by soaking Caand P-containing precursors between 13501 and 15001C. Such procedures require expensive high-temperature furnaces and subsequent grinding of sintered particulates. Grinding not only introduces ...
We report the unprecedented square-planar coordination of iridium in the iron iridium arsenide Ca(10)(Ir(4)As(8))(Fe(2)As(2))5. This material experiences superconductivity at 16 K. X-ray photoemission spectroscopy and first-principles band calculation suggest Ir(II) oxidation state, which yields electrically conductive Ir(4)As(8) layers. Such metallic spacer layers are thought to enhance the in...
Hydroxyapatite (HAp) forms the main mineral component of bone and teeth. This naturally occurring HAp is in the form of nano-metre sized crystallites of Ca10(PO4)6(OH)2 that contain a number of cation and anion impurities, for example CO3 , F, Na, Mg and Sr. Synthetic nano-sized HAp particles exhibit favourable biocompatibility and bioactivity and in order to better match the composition to nat...
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