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Background and aims: The arterial wall calcium score and circulating free DNA levels are now used in clinical practice as biomarkers of cardiovascular risk. Calcium phosphate apatite retention in the arterial wall necessitates precipitation on an anionic platform. Here, we explore the role of tissue-free DNA as such a platform.
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Method of synthesis of phosphate tricalcium (TCP) per neutralisation from CaCO 3 and H 3 PO 4. We also propose to prepare tricalcium phosphate apatite from low-cost reagents available such as calcium carbonate, CaCO 3 as a calcium source and phosphoric acid H 3 PO 4 as a phosphate source using the method established by …
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WEB1. Introduction. Biological apatite is an inorganic calcium phosphate salt (CaPs) in apatite form with a biological derivation. As the main inorganic component of …
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Relationship between wet DTS value and porosity of tetracalcium phosphate–dicalcium phosphate anhydrous type apatite cement specimen kept in an incubator at 37 °C and …
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Tribasic Calcium Phosphate | Ca5HO13P3 | CID 14781 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, safety/hazards/toxicity information, supplier lists, and more. ... Calcium hydroxy-apatite or calcium hydroxy-phosphate, (Ca10(OH)2(PO4)6), may be formed to small extent in ...
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Calcium phosphate is a compound that contains both calcium and phosphorus. It is a naturally occurring mineral that is a large component of bones and teeth. The compound has a variety of roles in ...
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Nanocrystalline apatite. Biomineralization. ACP. Bone mineral structure. Solid-state NMR. Nucleation/growth mechanisms. Abbreviations. ACP. amorphous calcium …
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Hydroxyapatite (HAp; Ca 10 (PO 4) 6 (OH) 2) is a form of calcium phosphate.It is the main inorganic mineral component of teeth and bones. HAp can be chemically synthesised as a biomaterial such as ...
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Ammonia produced as a waste product by the bacteria can make the urine less acidic (or more alkaline). Struvite stones form when the urine becomes more alkaline. The main chemicals in a struvite stone include struvite (magnesium ammonium phosphate) and calcium carbon-apatite. These stones can grow quickly and become quite large.
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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 …
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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 …
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NMR measurements show that an appreciable disordered calcium phosphate mineral layer covers the apatite crystallites. From quantification of Ca and P in HAP·qOPN, it is clear that the surface ...
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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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Abstract. Calcium phosphates are widespread in geochemistry, in biomineralization, and as biomaterials, and thus they have solicited great interest among researchers. In this chapter, prenucleation phenomena, amorphous phases, and crystallization processes from amorphous precursors are discussed for the calcium …
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Abstract. Calcium phosphate compounds form the inorganic phases of our mineralised tissues such as bone and teeth, playing an important role in hard tissue engineering and regenerative medicine. In dentistry and oral care products, hydroxyapatite (HA) is a stable and biocompatible calcium phosphate with low solubility being used for …
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The role of the collagen matrix 12, 13, 14 during the infiltration of the fibrils with amorphous calcium phosphate (ACP) and its subsequent transformation into …
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Study focused on the interaction of adsorbate with poorly crystalline apatitic calcium phosphates analogous to bone mineral. Calcium phosphates prepared in water-ethanol medium at physiological temperature (37 °C) and neutral pH, their Ca/P ratio was between 1.33 and 1.67.Adsorbate used in this paper takes the mixture form of two …
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These stones precipitate in alkaline urine (pH >7.2). Infectious stones are primarily composed of magnesium ammonium phosphate hexahydrate but may in addition contain calcium phosphate in the form of carbonate apatite. 2. Struvite stones are formed as a result of urinary tract infection with urease-producing bacteria.
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A group of calcium phosphates. Fluorapatite: Ca 5 (PO 4) 3 F Hydroxylapatite: Ca 5 (PO 4) 3 (OH) Chlorapatite: Ca 5 (PO 4) 3 Cl Carbonate-rich apatite/francolite: ... Uses of Apatite as Phosphate Rock. Most of the phosphate rock mined throughout the world is used to produce phosphate fertilizer. It is also used to produce animal feed ...
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Apatite, any member of a series of phosphate minerals, the world's major source of phosphorus, found as variously coloured glassy crystals, …
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Citrate supplementation is used not only for calcium stones, but also for uric acid (urine pH target 6.0 to 7.5 or greater) and cystine stones (urine pH target of 7.0 to 7.5 or greater). 15, 31 ...
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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 …
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The bioactivity of calcium phosphate bone grafts of varying chemistry and strut-porosity was compared by determining the rate of formation of hydroxycarbonate apatite crystals on the material surface after being soaked in simulated body fluid for up to 30 days. Three groups of silicate-substituted hydroxyapatite material were tested, with …
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Apatite is the generic name, which was first introduced by German geologist A.G. Werner. These minerals and their synthetic analogs represent a major class of ionic compounds and the most common …
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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 States, Europe, Russia, and India. Apatite is used as a source of phosphorus, phosphoric acid, and fertilizers.
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Most biominerals are inorganic/organic composite materials. 1 This is also the case for the bones and teeth of all vertebrates, which are formed by the combination of an inorganic calcium phosphate phase and an organic matrix 2 ().The inorganic component is a nanocrystalline solid with apatite structure and the chemical composition …
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Literature from human studies can provide some information on foods high (or low) in minerals (eg. calcium and oxalate). This information may assist some owners who select human food as treats. In most cases, if treats comprise less than 5-10% of the diet, they most likely will not affect prevention strategies to minimize urolith formation.
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The two forms of calcium phosphate include apatite (sometimes reported as carbonate apatite), which is the crystal type found in bone, or calcium hydrogen phosphate (brushite); the frequency of apatite is much greater than brushite. Calcium phosphate crystals in the urine sediment are typically dark and amorphous. ... Zilberman …
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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 …
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Hydroxyapatite (HA) was prepared by stirring amorphous calcium phosphate (ACP), which contained occluded Cl− as a tracer ion, in distilled water buffered to pH 7.4 by tris-HCl at 25, 37, 60, 80 and 100°. HA made in this manner contained from less than 1% (25°) to 11% (100°) of the amount originally occluded in the precursor ACP. These results suggest that …
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1. Introduction. Biological apatite is an inorganic calcium phosphate salt (CaPs) in apatite form with a biological derivation. As the main inorganic component of both bones and teeth, it is distributed in the organic constituents with certain sequence and direction [].By serving as the fillers in such biological tissues, biological apatite is critical …
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The two forms of calcium phosphate include apatite (sometimes reported as carbonate apatite), which is the crystal type found in bone, or calcium hydrogen phosphate (brushite); the frequency of apatite is much greater than brushite. Calcium phosphate …
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After oral exposure, slabs were incubated in HCl (pH values 2, 2.3, and 3) for 120 s and kinetics of calcium and phosphate release were measured photometrically; representative samples were evaluated by SEM and TEM. The physiological pellicle reduced demineralization at all pH values; the protective effect was enhanced by fluoride.
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The combination of 50 mcg of vitamin D3 and 325 mg calcium hydroxyapatite, as found in the OsteoMD ® bone health supplement, work synergistically to enhance bone mineralization, which is linked to reduced risk of osteoporosis. The hormone calcil also promotes calcium absorption, and vitamin D3 encourages …
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Bone is a natural composite material whose main components are mineral and organic matrices 1, 2. The mature mineral matrix is in the form of nanosized, elongated platelet-like carbonated calcium ...
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L'hydroxyapatite de formule Ca10(PO4)6(OH)2 a été élaborée à 100°C et à pH 8 par précipitation à partir d'une solution de calcium, obtenue à partir du carbonate de calcium, et d'une ...
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