scholarly journals Sand Cementation Test using Plant-Derived Urease and Calcium Phosphate Compound

2015 ◽  
Vol 56 (9) ◽  
pp. 1565-1572 ◽  
Author(s):  
R. A. N. Dilrukshi ◽  
Jun Watanabe ◽  
Satoru Kawasaki
Keyword(s):  
Calcium Phosphate ◽  
Phosphate Compound

Monetite (Dcpa), an Important Calcium Phosphate Compound - its Structure, Processing, and Applications

2020 ◽  
Author(s):  
H. Zhou ◽  
L. Yang ◽  
Uwe Gbureck ◽  
Sarit B. Bhaduri ◽  
Prabaha Sikder
Keyword(s):  
Calcium Phosphate ◽  
Phosphate Compound

scholarly journals Pure hydroxyapatite synthesis originating from amorphous calcium carbonate

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Michika Sawada ◽  
Kandi Sridhar ◽  
Yasuharu Kanda ◽  
Shinya Yamanaka
Keyword(s):  
Calcium Carbonate ◽  
Calcium Phosphate ◽  
Room Temperature ◽  
Molar Ratio ◽  
Final Phase ◽  
Amorphous Calcium Carbonate ◽  
Phosphate Compound ◽  
Synthesis Strategy ◽  
Phosphorylation Reaction ◽  
Subsequent Calcination

AbstractWe report a synthesis strategy for pure hydroxyapatite (HAp) using an amorphous calcium carbonate (ACC) colloid as the starting source. Room-temperature phosphorylation and subsequent calcination produce pure HAp via intermediate amorphous calcium phosphate (ACP). The pre-calcined sample undergoes a competitive transformation from ACC to ACP and crystalline calcium carbonate. The water content, ACC concentration, Ca/P molar ratio, and pH during the phosphorylation reaction play crucial roles in the final phase of the crystalline phosphate compound. Pure HAp is formed after ACP is transformed from ACC at a low concentration (1 wt%) of ACC colloid (1.71 < Ca/P < 1.88), whereas Ca/P = 1.51 leads to pure β-tricalcium phosphate. The ACP phases are precursors for calcium phosphate compounds and may determine the final crystalline phase.

A new synthetic granular calcium phosphate compound induces new bone in a sinus lift rabbit model

2018 ◽  
Vol 70 ◽  
pp. 31-39 ◽  
Author(s):  
Amela Trbakovic ◽  
Patricia Hedenqvist ◽  
Torbjörn Mellgren ◽  
Cecilia Ley ◽  
Jöns Hilborn ◽  
...  
Keyword(s):  
Calcium Phosphate ◽  
Rabbit Model ◽  
Sinus Lift ◽  
Phosphate Compound

Isolation from urine of pyrophosphate, a calcification inhibitor

1962 ◽  
Vol 203 (4) ◽  
pp. 671-675 ◽  
Author(s):  
Herbert Fleisch ◽  
Sylvia Bisaz
Keyword(s):  
Calcium Phosphate ◽  
Inorganic Pyrophosphate ◽  
Minimum Value ◽  
Phosphate Compound ◽  
Apatite Crystals ◽  
Urinary Inhibitors ◽  
The Mean ◽  
Calcium Phosphate Precipitation

The minimum value of the product, Ca X P, necessary for calcium phosphate precipitation to occur, was determined in vitro. The addition of 2.2% urine to the solutions raised the mean product from 53 to 105 (mg/100 ml)2, which shows that the urine contains inhibitors to hydroxyapatite precipitation. One of these was isolated and purified. Its characteristics are those of inorganic pyrophosphate. The mean level of urinary pyrophosphate was 2.24 mg P/liter, sufficient to inhibit precipitation of hydroxyapatite. Pyrophosphate is one of the substances permitting urine to be supersaturated with calcium and phosphate; other urinary inhibitors are still to be identified. It is suggested that the phosphate compound present in the plasma which inhibits hydroxyapatite precipitation is pyrophosphate. In bone, pyrophosphatase would act by locally destroying this calcification inhibitor, thus allowing the apatite crystals to form.

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