Ca-HA appeared as the principal apatite, while some amounts of octacalcium bis(hydrogenphosphate) tetrakis(phosphate) pentahydrate (OCP, Ca 8 (HPO 4) 2 (PO 4) 4 …
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Le texte complet de cet article est disponible en PDF. Mots clés : Calcification périarticulaire, Tendinopathie calcifiante, Rhumatisme à dépôts d'apatite, Phosphate de calcium basique, Échographie. Keywords : Soft tissue calcification, Calcifying tendinitis, Apatite deposition disease, Basic phosphate calcium, Ultrasonography. Plan
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Isotope tracing has been mostly used to study apatite weathering. Apatite is a calcium–phosphate mineral, and because P has no stable isotopes, the uptake dynamics can only be studied via the Ca ion (or potentially the 18 O/ 16 O in the phosphate group). In most rocks and soils apatite is the sole primary P source.
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Biological apatite is an inorganic calcium phosphate salt in apatite form and nano size with a biological derivation. It is also the main inorganic component of biological hard tissues such as bones and teeth of vertebrates. ... Journal de Biologie Buccale. 1977;5(3):203–218. [Google Scholar] 8. Danilchenko SN, Koropov AV, Protsenko IY ...
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The role of intracellular calcium phosphate in osteoblast-mediated bone apatite formation Proc Natl Acad Sci U S A. 2012 Aug 28;109(35):14170-5. doi: 10.1073/pnas.1208916109. ... the precise role osteoblasts play in mediating bone apatite formation remains largely unknown. To better understand the relationship between intracellular …
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Moreover, recent high-resolution measurements of apatite crystallites in bone have shown that individual crystallites are covered by a persistent layer of amorphous calcium phosphate.
WhatsApp: +86 18221755073The synthesis of single phased calcium phosphate apatites with variable Ca/P atomic ratio within the range 1.50–1.667 can be performed by the precipitation method with a …
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Thank you so much for your quick reply. I was diagnosed with MSK back in 2017. My first stone analysis (2017) showed 50% Calcium oxalate monohydrate, 40% Calcium oxalate dihydrate, and 10% Calcium phosphate (apatite). My second analysis (2021) showed 60% Calcium oxalate monohydrate, 30% Calcium phosphate (apatite) and 10% Calcium oxalate …
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Lanthanides "Ln" (rare earths) are critical elements found in natural minerals such as calcium phosphate apatites, in sedimentary and igneous settings as well as in skeletal diagenesis. From a medical point of view, nanoparticles of lanthanide-doped apatites can be produced for conferring luminescence properties of interest in cancer cells detection. However, …
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This review considers the fundamentals of calcium phosphate apatite characterization discussing several techniques: electron microscopy/EDX, XRD, FTIR/Raman spectroscopies, chemical …
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The divalent calcium formed was then precipitated with orthophosphate species to form small primary calcium phosphate particles (<1 ... The presence of B-type calcium carbonate–apatite was checked by infra-red analysis with the ... Fixation des métaux lourds par des phosphates de calcium dans le traitement des fumées d'Usines d ...
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This work explores the mechanisms underlying the crystallization of citrate-functionalized amorphous calcium phosphate (cit-ACP) in two relevant media, combining in situ and ex situ characterization techniques. Results demonstrate that citrate desorption from cit-ACP triggers the surface-mediated transformation to nanocrystalline apatite (Ap).
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It is known that ACP transforms into apatite under a normal physiological environment, because body fluid (SBF as well) is supersaturated with respect to ACP, apatite, and several other calcium phosphate phases, among which apatite is …
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Bioactivity of Biphasic Calcium Phosphate Granules, the Control of a Needle-Like Apatite Layer Formation for Further Medical Device Developments ... Characterization of the transformation from calcium-de ® cient apatite to b -tricalcium phosphate. 1 533–539. [Google Scholar] Gjerde C., Mustafa K., Hellem S., Rojewski M., Gjengedal H., Yassin ...
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The aims of this study were (1) to determine at the crystal level, the nonspecific biological fate of different types of calcium phosphate (Ca-P) ceramics after implantation in various sites (osseous and nonosseous) in animals and (2) to investigate the crystallographic association of …
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Despite this finding, few studies have yet attempted to address how intracellular calcium phosphate might be translated to mature ECM-associated bone apatite. Lehninger postulated that calcium phosphate packets might be extruded from mitochondria and make their way to the ECM to participate in bone formation .
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Amorphous calcium phosphate forms easily from aqueous solution, where it subsequently transforms into, e.g., HAP. There are several excellent reviews on this subject (Combes and Rey 2010; Dorozhkin 2010) and the present discussion will therefore be kept brief.Today it is clear that there are many ways to stabilize ACPs, for example, by the addition …
WhatsApp: +86 18221755073The three most common intermediate precursors of both synthetic PCA and biological apatite are the amorphous calcium phosphate (ACP: Ca 9 (PO 4) 6. nH 2 O), the octacalcium phosphate (OCP: Ca 8 H 2 (PO 4) 6.5H 2 O), and the dicalcium phosphate dihydrate (brushite, DCPD: CaHPO 4), in increasing order of importance. However, the identification of ...
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We investigate the transformation of mixed amorphous calcium phosphate/amorphous calcium carbonate phases into bone-like nanocrystalline apatite using in situ synchrotron X-ray diffraction and IR spectroscopy. The …
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Les ceramiques commerciales a base de phosphate de calcium frittees a haute temperature presentent une tres faible surface specifique et sont peu reactives. Bien qu'elles possedent une excellente osteoconductivite, leur capacite d'osteoinduction est tres limitee. L'hypothese centrale de ce travail a consiste a supposer qu'un revetement d'apatite carbonatee nanocristalline …
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Du phosphate de calcium hydraté monohydrogéné est proposé comme précurseur logique dans la formation de l'hydroxyapatite et une théorie expliquant la formation d'apatiles défectueux, à contenu faible en calcium, est présentée. ... La formation d'apatite parait être le résultat de deux processus différents au point de vue cinétique ...
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Based on the analysis of the measured precipitate induction times and the structure of the developing solid phase, OCP was also proposed by Feenstra and de Bruyn 66 as an intermediate in the conversion of ACP to apatitic calcium phosphate. Since OCP or apatite crystals were generally found in association with the ACP spherules, it is possible ...
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Apatite is a mineral with a relatively complex chemical composition, which can vary depending on the specific type of apatite. The basic formula for apatite is Ca5(PO4)3X, where X can be any one of several ions, including OH-, F-, Cl-, or a combination of these. Some variations in the formula can also occur due to the s…
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The growth of apatite crystals from amorphous calcium phosphate is an area of intense study. Here, the authors report on the use of high resolution TEM imaging to provide evidence of nucleation ...
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Biological mineralisations based on calcium phosphate. The mineral fractions of bones and teeth are non-stoichiometric apatite crystals. Their morphology, dimensions, composition and reactivity ...
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lastonite and calcium phosphate is promising for applica-tion in hard tissue engineering. Moreover, one unexplored property of wollastonite aiming for biological applications arises from its capacity to break chemical bonds within a phosphate ion-rich aqueous medium. The resulting dissoci-ated atoms or molecules then engage in a reaction, form-
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Les calcifications périarticulaires sont la conséquence de la précipitation dans les tissus mous de cristaux de phosphate de calcium basiques (PCB), principalement d'apatite carbonatée [1]. Dans la forme primitive, les dépôts périarticulaires de PCB intéressent surtout les tendons, mais aussi les bourses, les ligaments, les capsules ...
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However, when compared with the bulk of solid apatite (Ca/P = 1.67) this layer appears to be calcium-rich (Ca/P > 1.67) when the counter anions A n-(it is assumed, that apatite is dissolved in acid H n A, where A n-is an anion) adsorbed from the solution are not taken into account. If the counter anions are calculated, a numeric value for Ca/(P ...
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Royer P, Rey C. Calcium Phosphate coatings for orthopaedic prosthesis. Surf Coat Tech 1991; 45: 171–177. Article Google Scholar Shirkhanzadeh M. Calcium phosphate coatings prepared by electrocrystallization from aqueous electrolytes. J Mater Sci: …
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Parmi ces synthèses par précipitation l'une des plus utilisées fait réagir des solutions aqueuses de sels de phosphate et de calcium, selon la réaction générale suivante : 6 (NH4)2HPO4 + 10 ...
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نشانی: شماره 1688، جاده شرقی گاوک، منطقه جدید پودونگ، شانگهای، چین.
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