Liming materials. Determination of calcium content. Oxalate method

2002 ◽  
Keyword(s):  
Calcium Content

VASCULAR CONNECTIVE TISSUE UNDER THE INFLUENCE OF THYROXINE

1961 ◽  
Vol 36 (2) ◽  
pp. 197-211 ◽  
Author(s):  
lb Lorenzen
Keyword(s):  
Connective Tissue ◽  
Vessel Wall ◽  
Aortic Wall ◽  
Calcium Content ◽  
Sodium Sulphate ◽  
Collagen Content ◽  
Histological Changes ◽  
Hexosamine Content ◽  
Healing Processes

ABSTRACT Biochemical and histological changes in the aortic wall of rabbits were demonstrated following injection of epinephrine and l-thyroxine during 2 weeks. The widespread gross and microscopic changes were accompanied by an increase in hexosamine content and uptake of 35S labeled sodium sulphate, and an increased calcium content, whereas the collagen content, assessed by determination of hydroxyproline, was reduced. Comparison with the effect of epinephrine injections alone showed that thyroxine intensified the damaging effect of epinephrine on the vessel wall and induced more pronounced mucopolysaccharide changes in the aortic wall, presumably acting as a link in the healing processes.

scholarly journals An improvement of calcium determination technique in the shell of molluscs

2009 ◽  
Vol 52 (1) ◽  
pp. 93-98 ◽  
Author(s):  
Cristiane Soído ◽  
Maurício Carvalho Vasconcellos ◽  
Antônia Gonçalves Diniz ◽  
Jairo Pinheiro
Keyword(s):  
Hydrogen Peroxide ◽  
Nitric Acid ◽  
Experimental Model ◽  
Calcium Content ◽  
Conventional Technique ◽  
Organic Substances ◽  
Complexometric Method ◽  
Wet Weight ◽  
Calcium Determination

The complexometric method is usually applied to quantitative calcium determination in different materials; however the application of this method to calcium determination in molluscs shells infers significant interferences to the results. The snail Bradybaena similaris, a terrestrial gastropod, was used as experimental model to the improvement of this method. The shells were calcinated and dissolved in nitric acid, the hydrogen peroxide was also used to clarify the medium after the acid addition. The calcination procedure and the use of nitric acid reduced the significantly the interferences, allowing a major degree of destruction of the organic substances of the shell. The improvement of the calcium determination technique usually employed showed calcium content of 874.24 ± 56.617 mg of CaCO3/g of ash in comparison to the conventional technique that allowed the determination of 607.79 ± 67.751 mg of CaCO3/g of shell, wet weight.

Determination of Calcium Content in Calcium Tablet by Microscale Chemistry Experiment

2012 ◽  
Vol 518-523 ◽  
pp. 1375-1378
Author(s):  
Yu Guo Zhuo ◽  
Jun Liu
Keyword(s):  
Calcium Content ◽  
Routine Analysis ◽  
Determination Method ◽  
Relative Standard ◽  
Chemistry Experiment

The determination method of calcium content in calcium tablet using the micro titration has introduced, and also has compared the obtaining results by the microburette and by the routine analysis. F examination and t examination are all in the appropriate scope. The relative standard de-viation is less than 0.3%. There is no obvious difference in the results.

scholarly journals State of Synovial Medium in Patients with Degenerative Dystrophic Changes of Knee Joint Accompanied by Articular Surface Defects

2016 ◽  
Vol 23 (4) ◽  
pp. 40-43
Author(s):  
E. L Matveeva ◽  
A. G Gasanova ◽  
O. K Chegurov
Keyword(s):  
Synovial Fluid ◽  
Knee Joint ◽  
Subchondral Bone ◽  
Mineral Content ◽  
Surface Defects ◽  
Articular Surface ◽  
Calcium Content ◽  
Mineral Elements ◽  
Phosphate Ions

The purpose of the work was to determine the concentrations of mineral elements in subchondral bone and synovial fluid of patients with degenerative dystrophic knee joint diseases accompanied by articular surface defects. Subchondral bone and synovial fluid were used as a study material. Analysis of mineral content indices included the determination of calcium, phosphate, magnesium and chlorides concentrations by spectrophotometry. It was shown that the indices of basic electrolytes, i.e. of calcium and phosphate ions, in bone and synovial fluid did not correlate with each other and changed in different directions. Calcium content decreased in the bone while phosphate ions - in synovial fluid.

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