What's the difference between brushite and calcite?
Brushite
Definition:
(n.) A white or gray crystalline mineral consisting of the acid phosphate of calcium.
Example Sentences:
(1) Analytical scanning electron microscopy and x-ray diffraction disclosed that well-crystallized brushite is the major compound of the spherulites.
(2) The birefringence corresponds to that of brushite (Ca HPO4 X 2 H2O).
(3) It was concluded that precipitation of brushite, and a preferential dissolution of Na and Mg compounds from the enamel both play a role in the dissolution-precipitation reactions in dental enamel during acid attack.
(4) No transformation of apatite to brushite was identified in apatite-brushite mixtures at pH 6-4.
(5) Composition of the stone may also alter the success of treatment (with cystine, calcium oxalate monohydrate, and brushite stones being resistant to treatment).
(6) This suggests that in enamel brushite rather than octacalcium phosphate is the precursor phase of the mineral.
(7) Samples of simulated high-fluoride drinking waters, approximately 10 ppm F, were saturated with brushite, resulting in a state of supersaturation with respect to fluorapatite.
(8) Salicyl and gentiso derivatives favour the formation of brushite together with struvite and apatite.
(9) Brushite was observed in this callus beside apatite, and the number of crystals found was less than in physiological nature bone.
(10) The activity product of [Ca(2+)] x [HPO(4) (2-)] necessary to produce a precipitate ranged from 2.2 to 3.5 times the solubility product of brushite, but the range and mean were the same for both groups of subjects.
(11) The activity product ratios of brushite and calcium oxalate were significantly elevated in stone-forming groups, largely because of the high renal excretion of calcium.
(12) These crystals identified as brushite (CaHPO4-2H2O:dicalcium phosphate dihydrate: DCPD) were found in four subjects.
(13) Moreover, potassium citrate decreased urinary saturation of calcium oxalate and uric acid, although it slightly increased that of brushite.
(14) The highest degree of urinary supersaturation with respect to calcium oxalate monohydrate (COM) and brushite at which secondary nucleation and growth of small amounts of COM and hydroxyapatite (HAP) are inhibited was determined by new and simple methods.
(15) In the enamel apatite suspensions, the apatite ion product altered with pH, which explained why apatite did not transform to brushite at pH 5-4.
(16) Similar results to those of series 1 were recorded but, in addition, calcium oxalate trihydrate (COT) precipitated in the pH range 3 to 6.5 and brushite at pH greater than 5.5.
(17) Urinary Brushite saturation was generally low and showed no significant differences between the two mineral waters.
(18) Brushite (CaHPO(4).2H(2)O) was considered to govern the formation of renal calculus of calcium phosphate origin.
(19) The polypeptides of encephalomyocarditis, Mouse-Elberfeld and type 5 rhinoviruses behave similarly when chromatographed on calcium phosphate (brushite), each being eluted by a linear phosphate buffer gradient containing sodium dodecyl sulphate in three major peaks, CI, C2 and C3.
(20) Of the brushite stones 61% appeared hyperdense on x-ray but they had no consistent shape.
Calcite
Definition:
(n.) Calcium carbonate, or carbonate of lime. It is rhombohedral in its crystallization, and thus distinguished from aragonite. It includes common limestone, chalk, and marble. Called also calc-spar and calcareous spar.
Example Sentences:
(1) The crystallographic orientation of the calcite also appears to be independent of these fibrils.
(2) The calcium carbonates-calcite, aragonite, and vaterite-constitute most of the remainder of the calculi.
(3) Crystallographic analysis of stones from patients with nutritional pancreatitis (NP), as well as alcoholic pancreatitis (AP), revealed that the main constituent was calcite (CaCO3).
(4) Calcite was present in all stones, vaterite in 12%, and a central amorphous material in 30%.
(5) X-ray diffraction showed that calcite (CaCO3) was the major crystalline constituent of the calcareous deposits.
(6) When the doped glasses have been immersed in a physiological solution (199 medium), a film of calcite forms on the glass surface and this modification is related to the type of doping agent used, decisive for close linking between metal supports and the glass.
(7) We suggest that precipitation of calcite in the pancreatic duct occurs as the primary event in the formation of pancreatic calculi and that it may continue until the duct is completely occluded.
(8) 5-7): calcite and quartz are the principal components of the sinters, additional diffuse apatite lines appear in bone samples.
(9) These features are characteristic of sea urchin (Echinoderm) spines which are composed of ornately formed calcite crystals covered by an epithelium.
(10) Its absence in all analyzed invertebrate tissues (including calcitic, aragonitic, and apatitic mineral phases) indicates that matrix protein-bound gamma-carboxyglutamic acid is not obligatory for the calcification process in the invertebrates.
(11) Quantitatively, phosphate is by far the most important inhibitor of calcite precipitation present in saliva, suggesting that inhibition of calcite precipitation by the macromolecules may be of secondary significance.
(12) Plates of calcite (CaCO3) were implanted in rabbit tibiae, and their biocompatibility and bonding ability to bone were studied.
(13) Subsequent increase in diameter of the rod involves the radial development of irregular columns of calcite which arise from the peripheral nodules.
(14) The phenomenon of dissolution and recrystallisation in situ of the calcite can be a trap because it can be a reservoir for micro-organisms.
(15) Synechococcus strain GL24 was isolated from Fayetteville Green Lake, New York, where it has a demonstrated role in the formation of calcitic minerals.
(16) Pancreatic stones are observed in both humans and cattle, and are approximately 95% CaCO3 (calcite) in both species.
(17) Skeletal walls of more than one mineralogy have the magnesium-rich layer (calcite) surrounding the living chamber and the strontium-rich layer (aragonite) on the outside.
(18) Here we report on the ability of a soil bacterium to synthesize calcite in a calcium-stressed environment.
(19) Formation of inner protein nidus in the form of a cobweb is the first stage, then calcite is deposited on this fibrous network as tiny crystals.
(20) The biocompatibility of mammal bone with aragonite and calcite skeletons of aquatic invertebrates (Corals, Molluscs) led us, after animal experimentation, to implant in humans artificial dental roots derived from such invertebrates.