آخرین محصولات

KIDNEY STONE ANALYSIS: How Bad is It?

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 …

Hydroxyapatite benefits, dosage, and side effects

Hydroxyapatite is a calcium-phosphate mineral complex that provides bone and teeth with their structural hardness and integrity. Medically, it has been used as an implant for bone and dental surgeries, in toothpaste, and …

Osteopontin regulates biomimetic calcium phosphate crystallization …

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.

Apatite Formation: Why It May Not Work as Planned, and …

This review considers the fundamentals of calcium phosphate apatite characterization discussing several techniques: electron microscopy/EDX, XRD, FTIR/Raman spectroscopies, chemical …

Calcium Phosphate

Hazards of minerals—rocks and sustainable development. S.K. Haldar, in Introduction to Mineralogy and Petrology (Second Edition), 2020 11.3.1 Apatite. Apatite (Fig. 1.12) is a group of natural calcium mineral±fluorine and chlorine (Ca 5 (PO 4) 3 (F, Cl, OH)).The mineral primarily occurs as phosphate rock. The large apatite deposits are located in China, Canada, the United …

Minéralisations biologiques à base de phosphate de calcium

Biological mineralisations based on calcium phosphate. The mineral fractions of bones and teeth are non-stoichiometric apatite crystals. Their morphology, dimensions, composition and reactivity ...

Bone Tissue Regeneration by Collagen Scaffolds with Different Calcium

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 …

Physicochemistry of Apatite and Its Related Calcium Phosphates …

Bioactivity is a property of the ceramic surface that induces biological integration of living soft and hard tissues. The core mechanism of bioactivity is the partial dissolution and release of ionic products in vivo, elevating local concentrations of calcium and phosphate and precipitating a biological apatite on the surface of ceramics [8, 9].This apatite layer formed in …

Insight into Biological Apatite: Physiochemical Properties …

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 ...

Hydroxyapatite formation from a hydrated calcium monohydrogen phosphate

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 ...

UPENN SOM | Lab Template

APATITE (BASIC CALCIUM PHOSPHATE) ASSOCIATED ARTHROPATHIES. These crystals are those identified in calcific tendinitis and periarthritis, tumoral calcinosis, idiopathic …

Transformation of amorphous calcium phosphate to bone …

Herein, we demonstrate a detailed transformation mechanism of amorphous calcium phosphate spherical particles to apatite platelet-like crystals, within the confined nanodomains of a bone …

Calcium Phosphates for Medical Applications | SpringerLink

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: …

Apatite | Properties, Occurrence, Uses

Apatite is a mineral that is composed of calcium phosphate, with the chemical formula Ca5(PO4)3(OH,F,Cl). It is a member of the apatite group of minerals, which also includes hydroxylapatite and fluorapatite.Apatite is a relatively common mineral that can occur in a variety of colors, including yellow, green, blue, and purple.

Échographie des calcifications périarticulaires

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 ...

α-tricalcium phosphate synthesis from amorphous calcium phosphate

Powders synthesis. Amorphous tri-calcium phosphate (ATCP, Ca/P = 1.5) was synthesized by double decomposition of calcium and phosphate salts dissolved in aqueous solutions at room temperature and pH close to 10 [7, 11, 14, 18].A calcium nitrate solution, Ca(NO 3) 2 ∙4H 2 O (43.6 g in 550 mL of water containing 40 mL of NH 4 OH 30%),was mixed quickly …

Calcium phosphate apatites with variable Ca/P atomic ratio I.

The 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 …

Apatite Formation from Amorphous Calcium …

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 …

Apatite | Properties, Occurrence, Uses

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…

Biomatériaux à base de phosphates de calcium | Request …

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 ...

Physico-chemical characterization of calcium-apatite …

Calcium phosphate materials synthesized from apatite with atomic Ca/P ratios ranging from 1.50 to 1.67 (Ca10-x(HPO4)x(PO4)6-x(OH)2-x (0 ≤ x ≤ 1)) have very interesting applications in bone regeneration and in the environment field for the removal of toxic species. The physicochemical characteristics of synthetic calcium apatite change when the Ca/P ratio …

Calcium Phosphate Apatites: Wet Formation, Thermal …

Apatite calcium phosphates have been synthesized at pH 9–11, Ca/P = 1.50–1.67 under variable isolation conditions. A complex procedure for identification of inclusion of …

Phase Transformations in Calcium Phosphate Crystallization

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 …

Apatitic calcium phosphates: Synthesis, characterization and reactivity

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 ...

Calcium Phosphate Apatites: Wet Formation, Thermal …

Abstract Apatite calcium phosphates have been synthesized at pH 9–11, Ca/P = 1.50–1.67 under variable isolation conditions. A complex procedure for identification of inclusion of amorphous calcium phosphate by precipitation of hydroxyapatite under non-equilibrium conditions, including XRD/FTIR/DTA methods. The maximal stabilization of amorphous phase …

Comparative chemistry of amorphous and apatitic …

Noncrystalline calcium phosphates have been identified as obligatory inter- mediates in the de novo formation of apatitie calcium phosphate crystals from both alkaline (Eanes et al., 1965; Eanes and Posner, 1965) and neutral (Walton et al., 1967; Termine and Posner, 1970) solutions. These noncrystalline inter-

Calcium Orthophosphates: Crystallization and Dissolution

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 ...

Calcium phosphate apatites with variable Ca/P atomic …

Single phased apatitic calcium phosphate powders Ca 10−x (PO 4) 6−x (HPO 4) x (OH) 2−x with Ca/P molar ratio ranging from 1.5 to 1.667 (0⩽x⩽1) were synthesised using wet method. Outside this compositional range the powders were biphasic mixtures composed of a calcium phosphate apatite and CaHPO 4 (Ca/P<1.5) or Ca(OH) 2 (Ca/P>1.667). Temperature …

Mechanism of apatite formation on a poorly crystallized calcium …

The 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 ...

Échographie des calcifications périarticulaires

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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