نتایج جستجو برای: Hydroxyl Carbonate Apatite

تعداد نتایج: 52615  

Journal: :Frontiers in bioscience 2013
Michael E Fleet

The location and orientation of the carbonate ion in the channel (A) and phosphate (B) positions of hydroxyapatite (CHAP) have been investigated by single-crystal X-ray structure and Fourier transform infrared (FTIR) spectroscopy, using crystals synthesized at high pressure. The type A carbonate ion is oriented in the apatite channel with two oxygen atoms close to the c-axis and the B carbonate...

New approaches to extracting natural hydroxyl carbonate apatite from bio waste of bovine bones cortical femur have been developed. To extract pure and natural bio ceramics, three different treatments have been applied: 1-Calcination heat treatment at temperature of 700 , 2-alkaline hydrothermal at temperature of 275 and 3-Pressurized low polarity water at temperature of 250 . Raw bovine bone an...

Journal: :Dental materials journal 2010
Fumikazu Daitou Michito Maruta Giichiro Kawachi Kanji Tsuru Shigeki Matsuya Yoshihiro Terada Kunio Ishikawa

In this study, we investigated a novel method for fabrication of carbonate apatite block without ionic movement between precursor and solution by using precursor that includes all constituent ions of carbonate apatite. A powder mixture prepared from dicalcium phosphate anhydrous and calcite at appropriate Ca/P ratios (1.5, 1.67, and 1.8) was used as starting material. For preparation of specime...

Journal: :Biomaterials 2004
Yu-Fen Chou Wen-An Chiou Yuhuan Xu James C Y Dunn Benjamin M Wu

The classic biomimetic apatite coating process can be accelerated by first immersing substrates into concentrated simulated body fluid, 5x SBF (SBF1), at 37 degrees C, to form an initial coating of precursor apatite spheres, and subsequently transferring to a second 5x SBF (SBF2) solution which is devoid of crystal growth inhibitors to promote phase transformation of SBF1-derived precursor apat...

2014
Gokul Gopinathan Tianquan Jin Min Liu Steve Li Phimon Atsawasuwan Maria-Therese Galang Michael Allen Xianghong Luan Thomas G. H. Diekwisch

The transition from invertebrate calcium carbonate-based calcite and aragonite exo- and endoskeletons to the calcium phosphate-based vertebrate backbones and jaws composed of microscopic hydroxyapatite crystals is one of the great revolutions in the evolution of terrestrial organisms. To identify potential factors that might have played a role in such a transition, three key domains of the vert...

2005
MICHAEL E. FLEET XIAOYANG LIU PENELOPE L. KING

Carbonated hydroxylapatite (C-OHAp) and carbonate apatite (CAp; x 0.5) in the composition series Ca10(PO4)6–y[(CO3)x+(3/2)y(OH)2–2x], x = 0.0–0.7, y = 0.0–0.6, have been synthesized at 2–4 GPa, and studied by FTIR spectroscopy and single-crystal X-ray diffraction. Three structural locations for the carbonate ion have been identifi ed: (1) apatite channel, oriented with two oxygen atoms close to...

2013
J. C. DE ARAUJO E. L. MOREIRA G.D.A. SOARES I. N. BASTOS

 The crystal structure of two B-type carbonated apatite samples was re-analyzed, using the data of Wilson et al (2006). By applying the least squares method for the determination of carbon and oxygen atoms, a slightly different result was obtained, suggesting that the carbonate ion is not rigorously planar. Keywords Carbonated apatite, Carbonate, Xray diffraction.

ملک‌زاده شفارودی, آزاده, کریم‌پور, محمد‌حسن, زارعی, آرزو ,

Khanlogh magnetite-apatite deposit is located in northwest of Neyshabour. This area is situated in Binaloud structural zone and east of Tertiary Quchan-Sabzevar magmatic arc. Geology of the area is dacitic volcanic rock intruded by Oligocene subvolcanic rocks with composition of quartz monzodiorite and granodiorite. Miocene sedimentary rocks trusted on them. The magmatism in the area shows char...

2010
Kunio Ishikawa

Although blockor granular-type sintered hydroxyapatite are known to show excellent tissue responses and good osteoconductivity, apatite powder elicits inflammatory response. For the fabrication of hydroxyapatite block or granules, sintering is commonly employed. However, the inorganic component of bone and tooth is not high crystalline hydroxyapatite but low crystalline B-type carbonate apatite...

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