Results 221 to 230 of about 1,516,700 (300)
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Biomaterials, 2001
The potential energy surfaces associated with [Ca3(PO4)2n clusters are analyzed in detail using ab initio calculations for n ranging from one to four. Considering separated clusters, energy criteria favor the so-called Posner's cluster Ca9(PO4)6, which is the core of the actual structural model of amorphous calcium phosphate.
N, Kanzaki +4 more
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The potential energy surfaces associated with [Ca3(PO4)2n clusters are analyzed in detail using ab initio calculations for n ranging from one to four. Considering separated clusters, energy criteria favor the so-called Posner's cluster Ca9(PO4)6, which is the core of the actual structural model of amorphous calcium phosphate.
N, Kanzaki +4 more
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Calcium oxalate: calcium phosphate transformations
Urological Research, 2010Knowledge of the physical-chemical mechanisms responsible for the crystal growth and dissolution events involved in stone formation might enable the manipulation of thermodynamics in such a way as to increase the solubility of sparingly soluble phases (such as calcium oxalates and phosphates), thereby reducing the driving force for stone formation ...
George H, Nancollas, Zachary J, Henneman
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2001
ACP is a unique calcium phosphate in that it lacks long-range crystalline order. Yet the constancy in the composition of ACP over a wide range of solution conditions suggests a well-defined local structural unit. Although this order within disorder is the most distinguishing feature of ACP, the solution instability of ACP and its ready transformation ...
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ACP is a unique calcium phosphate in that it lacks long-range crystalline order. Yet the constancy in the composition of ACP over a wide range of solution conditions suggests a well-defined local structural unit. Although this order within disorder is the most distinguishing feature of ACP, the solution instability of ACP and its ready transformation ...
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Canine Calcium Phosphate Uroliths
Veterinary Clinics of North America: Small Animal Practice, 1986Uroliths composed primarily of calcium phosphate are identified in approximately 3 per cent of canine stone patients. Predisposing factors to the formation of calcium phosphate uroliths include elevated urine pH, hypercalciuria, and the presence of crystallization inhibitors and promoters.
J S, Klausner, C A, Osborne
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Calcium Phosphate in Catheter Encrustation
British Journal of Urology, 1987Summary— Encrusted catheters from nine female patients were the source of samples of deposits which were examined by X‐ray diffraction, atomic absorption spectroscopy, infra‐red spectroscopy and extended X‐ray absorption fine structure (EXAFS) spectroscopy. In eight samples the only crystalline phase which could
Cox, A. J. +4 more
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Determination of calcium in official calcium phosphates
Journal of Pharmaceutical Sciences, 1967The assay of official calcium phosphates for calcium can be brought into the general method for calcium determination by titration with EDTA using hydroxynaphthol blue indicator by dissolving the sample in a strictly limited amount of hydrochloric acid, passing an aliquot of the solution through a column of anion-exchange resin in the chloride form ...
J S, Kim, M M, Tuckerman
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XRD Analysis of Calcium Phosphate and Biocomposite Calcium Phosphate/Bioresorbable Polymer
Materials Science Forum, 2006Composite biomaterials based on calcium phosphate ceramic due to their high bioactivity are of interest for biological application and bone tissue repair. Structural and microstructural parameters of inorganic constituent of these materials are very important for the synthesis and characterization of composites.
Kandić, Ljiljana +2 more
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Chemistry – A European Journal, 2016
AbstractCrystallization from amorphous phases is an emerging pathway for making advanced materials. Biology has made use of amorphous precursor phases for eons and used them to produce structures with remarkable properties. Herein, we show how the design of the amorphous phase greatly influences the nanocrystals formed therefrom.
Casper J. S. Ibsen +2 more
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AbstractCrystallization from amorphous phases is an emerging pathway for making advanced materials. Biology has made use of amorphous precursor phases for eons and used them to produce structures with remarkable properties. Herein, we show how the design of the amorphous phase greatly influences the nanocrystals formed therefrom.
Casper J. S. Ibsen +2 more
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Tympanoplasty With Calcium Phosphate
Archives of Otolaryngology - Head and Neck Surgery, 1984In 35 patients, with an average follow-up period of 2 1/2 years, the middle ear was reconstructed with prostheses of hydroxyapatite, which is the main substance of living bone tissue. In case of a missing incus, an interposition prosthesis of dense hydroxyapatite was used.
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Amorphous calcium (ortho)phosphates
Acta Biomaterialia, 2010Amorphous calcium phosphates (ACPs) represent a unique class of biomedically relevant calcium orthophosphate salts, having variable chemical but essentially identical glass-like physical properties, in which there is neither translational nor orientational long-range ordering of the atomic positions.
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