scholarly journals Effects of pH and Ca/P molar ratio on the quantity and crystalline structure of calcium phosphates obtained from aqueous solutions

2009 ◽  
Vol 89 (3-4) ◽  
pp. 301-316 ◽  
Author(s):  
Omar Mekmene ◽  
Sophie Quillard ◽  
Thierry Rouillon ◽  
Jean-Michel Bouler ◽  
Michel Piot ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Crystalline Structure ◽  
Calcium Phosphates ◽  
Molar Ratio ◽  
Effects Of Ph

Electrospun nanofibrous membranes of cellulose acetate containing hydroxyapatite co-doped with Ag/Fe: morphological features, antibacterial and degradation of methylene blue from aqueous solutions

2021 ◽  
Author(s):  
Ahmed Esmail Shalan ◽  
M. Afifi ◽  
M.M. El-Desoky ◽  
M.k Ahmed
Keyword(s):  
Methylene Blue ◽  
Aqueous Solutions ◽  
Cellulose Acetate ◽  
Morphological Features ◽  
Molar Ratio ◽  
Electrospinning Technique ◽  
Nanofiber Membranes ◽  
Nanofibrous Membranes ◽  
Co Doped

Cellulose acetate nanofiber membranes containing hydroxyapatite co-doped with Ag/Fe were efficaciously attained through the electrospinning technique. Different molar ratio compositions of hydroxyapatite co-doped with Ag/Fe in the structure of the...

The effect of change of ionomer/polyol molar ratio on dispersion stability and crystalline structure of films produced from hydrophilic polyurethanes

2016 ◽  
Vol 134 (7) ◽  
Author(s):  
Sandhya Rani Senevirathna ◽  
Shantha Amarasinghe ◽  
Veranja Karunaratne ◽  
Masilamani Koneswaran ◽  
Laleen Karunanayake
Keyword(s):  
Crystalline Structure ◽  
Dispersion Stability ◽  
Molar Ratio

Comparison of cis and trans-Platinum Mononucleobase Compounds with DNA and Protein Models

2008 ◽  
Vol 61 (9) ◽  
pp. 694 ◽  
Author(s):  
Joseph V. Strukl ◽  
Queite A. de Paula ◽  
Xiaohong Yang ◽  
Yun Qu ◽  
Nicholas P. Farrell
Keyword(s):  
Nmr Spectroscopy ◽  
Antiviral Activity ◽  
Aqueous Solutions ◽  
Guanosine Monophosphate ◽  
Molar Ratio ◽  
Trans Isomers ◽  
Specific Proteins ◽  
Low Cytotoxicity ◽  
Cis And Trans ◽  
Protein Models

Reactions of 5′-guanosine monophosphate (5′-GMP) and N-acetylmethionine (N-ac-l-Met) with the mononucleobase compounds, cis-[PtCl(L)n(9-EtGH)]+ (L = NH3, 4-pic, n = 2; L = en, n = 1) in a 1:1 molar ratio have been studied in aqueous solutions at pH 7.3 using 1H and 195Pt NMR spectroscopy. There is a high kinetic preference for sulfur over nitrogen binding. These results are compared with the trans isomers. Based on low cytotoxicity and a high sulfur/nitrogen preference the cis isomers may also present suitable features for antiviral activity through interaction with specific proteins.

Characterization of Nano-Biphasic Calcium Phosphates Synthesized under Microwave Curing

2008 ◽  
Vol 3 ◽  
pp. 67-87 ◽  
Author(s):  
Wafa I. Abdel-Fattah ◽  
Fikry M. Reicha ◽  
Tarek A. Elkhooly
Keyword(s):  
Ph Value ◽  
Calcium Phosphates ◽  
Chemical Precipitation ◽  
Calcium Deficiency ◽  
Molar Ratio ◽  
X Ray Diffraction ◽  
X Ray ◽  
Microwave Curing ◽  
Tcp Phase ◽  
Diffraction Patterns

Two biphasic BCP ceramic samples were synthesized by chemical precipitation and microwave curing of calcium deficient hydroxyapatite CDHA under the same pH value and temperature but varied in their initial Ca/P molar ratio. Precipitates were characterization after thermogravimetric analysis, fourier transform infrared spectroscopy, X-ray diffraction, atomic absorption spectroscopy and TEM. Hydroxyapatite (HA) contents were measured for the two biphasic calcium phosphate (BCP) ceramics by sintering the calcium-deficient apatites (CDHA). The results reveal two condensation mechanisms of HPO42- affecting the Ca/P molar ratio after calcination. The X-ray diffraction patterns of BCP powders show the in situ formation of -TCP in the BCP powder. The amount of -TCP phase increases as the initial Ca/P molar ratio decreases due to more calcium deficiency in CDHA structure. The influence of HPO42- incorporation on increasing -TCP phase content after calcination is evaluated. TEM micrographs proved the effect of microwave curing during the preparation process on reducing of particle size to nanoscale range and the destruction of CDHA to finer HA and -TCP particles upon calcination.

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