knowledge of the phosphorus (p) forms is essential for understanding the behavior of phosphorus. the aim of this study was to investigate the effect of wheat cultivation on different inorganic p forms of soil. a greenhouse factorial experiment in a completely randomized design was carried out with three replications in 20 soil types and plantation at two levels (with and without plantation). th...

Double-layer composite coatings composed of a P2O5-based glass/Ca10(PO4)6(OH)2 (HA) mixture top layer and a simple HA underlayer, on Ti-6Al-4V substrates, were prepared using a plasma-spraying technique. The in vitro bioactivity of these coatings was assessed by immersion testing in simulated body fluid. Both scanning electron microscopy (SEM) analysis and the ionic solution changes followed by...

Using a box-sampler, surface and core sediment samples were collected from the Bohai and Yellow Seas in 1998e1999. The sediments were sequentially extracted to determine six phosphorus fractions, and non-sequentially extracted for total P (TP) and inorganic P (IP), where the difference between TP and IP was assumed to be organic P (OP). It was found that more than 70% of the total P is inorgani...

Collagen and apatite were coprecipitated as a composite coating on poly L-lactic acid (PLLA) in an accelerated biomimetic process. The incubation solution contained collagen (1 g/L) and simulated body fluid with 5 times inorganic ionic concentrations as human blood plasma. The coating formed on PLLA films and scaffolds after a 24-h incubation was characterized by using energy-dispersive X-ray s...

Including humans, many multicellular organisms produce similar hard tissues, such as bones, teeth, shells, skeletal units, and spicules. These hard tissues are biocomposites and incorporate both structural macromolecules (lipids, proteins, and polysaccharides) and inorganic minerals. We do not fully understand the control mechanism of biomineralization in primitive or in developed organisms. Th...

The synthesis of apatite silicated Ca10(PO4)6-x(SiO4)x(OH)2-x (SiHA) with 0?x?2 was investigated using a wet precipitation method followed by heat treatment calcium carbonate CaCO3 and phosphoric acid H3PO4 silicon tetraacetate SiC8H20O4 (TEOS) in medium water ethanol, three different silicate concentrations. After drying, the samples are ground then characterized analytical techniques like X-r...

Sedimentary phosphorus species concentrations were examined in cores (0-10 cm) from 5 locations in the open middle Adriatic in June 2002. Measurements included organic phosphorus (OP) and inorganic P species: P in biogenic apatite (P-FD), P adsorbed onto iron-oxy/hydroxides (P-Fe), P in authigenic apatite (P-AUT) and P in detrital apatite (P-DeT). Total iron (Fe-TOT) and iron-oxyhydroxides (Fe(...

Introduction: A bone graft is a substitute material that has been widely used in grafting. In general, can be resorbable and replace normal the healing process within few months, because principle nature of osteoconduction, osteoinduction, osteogenic. One synthetic materials commonly hydroxyapatite (HA), which identical to crystal structure from bone. Review: Hydroxyapatite graft, most now due ...