Results 161 to 170 of about 2,497 (206)

Octacalcium Phosphate as a Precursor in Biomineral Formation

Advances in Dental Research, 1987
What are biominerals and how are they formed? It is usually assumed: (i) that the prototype for most apatitic biominerals is hydroxyapatite (OHAp), Ca 5 (PO 4 ) 3 OH; and (ii) that the OHAp structure has been ...
W E, Brown, N, Eidelman, B, Tomazic
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Octacalcium Phosphate and Hydroxyapatite: Crystallographic and Chemical Relations between Octacalcium Phosphate and Hydroxyapatite

Nature, 1962
Octacalcium Phosphate and Hydroxyapatite: Crystallographic and Chemical Relations between Octacalcium Phosphate and ...
WALTER E. BROWN, JAMES P. SMITH, JAMES R. LEHR, A. WILLIAM FRAZIER   +3 more
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Kinetics of crystallization of octacalcium phosphate

The Journal of Physical Chemistry, 1984
Cristallisation a 37°C de Ca 8 H 2 (PO 4 ) 6 •5H 2 O a partir de solutions sursaturees metastables, sur ...
J. C. Heughebaert, G. H. Nancollas
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Features of Octacalcium Phosphate Thermolysis

Refractories and Industrial Ceramics, 2014
Octacalcium phosphate (OCP) is synthesized by pyrolysis of brushite CaHPO4 · H2O in an acetate buffer solution at 60 °C and pH = 7.5. OCP thermolysis is performed in the range 200 – 700 °C. The starting OCP and powder obtained is studied by IR-spectroscopy, electron microscopy, and x-ray-phase analyses.
V. I. Putlyaev, E. V. Kukueva, T. V. Safronova, V. K. Ivanov, B. R. Churagulov   +4 more
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The growth of octacalcium phosphate on beta tricalcium phosphate

Journal of Crystal Growth, 1983
The crystallization of calcium phosphate phases from metastable supersaturated solutions following seeding with well characterized tricalcium phosphate (β-TCP) solid has been studied at 37°C, using the constant composition method. The results confirm that at a pH of 6.00, it is impossible to precipitate β-TCP at ambient temperatures.
Jean-Claude Heughebaert, Stephen J. Zawacki, George H. Nancollas   +2 more
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The effects of magnesium and fluoride on the hydrolysis of octacalcium phosphate

Archives of Oral Biology, 1992
The adsorption of Mg ions on octacalcium phosphate (OCP) and its effect on OCP hydrolysis, with and without F, were studied. The Mg adsorption isotherm was fitted by the Langmuir model with an affinity constant of 0.74 ml/mumol and maximum number of sites, 31.19 mumol/g.
M S, Tung, B, Tomazic, W E, Brown
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Collapsed Octacalcium Phosphate Stabilized by Ionic Substitutions

Crystal Growth & Design, 2010
We have explored the possibility of introducing biologically relevant ions, namely Sr(2+), Mg(2+), and Mn(2+), into the structure of octacalcium phosphate (OCP). OCP with partial substitutions of Sr(2+) and Mg(2+) for Ca(2+) up to 7.4 and 1.0 at%, respectively, was successfully synthesized.
BOANINI, ELISA, M. Gazzano, RUBINI, KATIA, BIGI, ADRIANA   +3 more
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The Role of Brushite and Octacalcium Phosphate in Apatite Formation

Critical Reviews in Oral Biology & Medicine, 1992
Studies of apatite mineral formation are complicated by the possibility of forming several calcium phosphate phases. The least soluble, hydroxyapatite (HAP), is preferentially formed under neutral or basic conditions. In more acidic solutions phases such as dicalcium phosphate dihydrate (Brushite, DCPD) and octacalcium phosphate (OCP) are often found.
M S, Johnsson, G H, Nancollas
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Electron microscopy of octacalcium phosphate in the dental calculus

Journal of Electron Microscopy, 2009
The purpose of this study was to morphologically demonstrate the presence of octacalcium phosphate in the dental calculus by judging from the crystal lattice image and its rapid transformation into apatite crystal, as part of our serial studies on biomineral products. We also aimed to confirm whether the physical properties of octacalcium phosphate are
Mitsuo, Kakei, Toshiro, Sakae, Masayoshi, Yoshikawa   +2 more
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Effect of cationic surfactant on the transformation of octacalcium phosphate

Journal of Crystal Growth, 2000
The effect of cationic surfactant, dodecylammonium chloride (DDACl), on the hydrolysis of octacalcium phosphate (OCP) was studied. The presence of DDACl inhibited, but did not stop, the transformation from OCP into a more basic calcium phosphate. DDACl inhibitory effect may be ascribed to the electrostatic matching between positively charged surfactant
Dutour Sikirić, Maja, Horvath, Laszlo, Filipović-Vinceković, Nada, Šmit, Ivan   +3 more
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