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1983 (1)
1974 (1)
1Author    H. J. Tochon-Danguy, G. Boivin, M. Geoffroy, C. Walzer, C. A. BaudRequires cookie*
 Title    Physical and Chemical Analyses of the Mineral Substance during the Development o f Two Experimental Cutaneous Calcifications in Rats: Topical Calciphylaxis and Topical Calcergy  
 Abstract    In subcutaneous calcinoses induced in rats by topical calciphylaxis and topical calcergy, the ultrastructural aspects related to the evolution o f calcified deposits were previously described. In the present study by m eans o f X-ray diffraction, infrared spectrometry and electron spin resonance, different biophysical analyses are performed on the mineral substance deposited during developm ent o f calciphylaxis and calcergy. A rapid evolution o f the calcium phosphate deposits into hydroxyapatite was noticed along the first 20 days o f the calcinoses; from then, there is no important m odification even at the later stages, and the characteristics o f the mineral substance are mostly sim ilar to that o f bone tissue. The concentration o f trace elem ents such as M g2+ and F e2+, is found higher in cutaneous calcinoses than in bone tissue. 
  Reference    Z. Naturforsch. 38c, 135 (1983); received July 10 1982 
  Published    1983 
  Keywords    Calcification, Calciphylaxis, Calcergy, Apatite, ESR 
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 TEI-XML for    default:Reihe_C/38/ZNC-1983-38c-0135.pdf 
 Identifier    ZNC-1983-38c-0135 
 Volume    38 
2Author    L. G. Petersson, G. Frostell, Sweden, A. LoddingRequires cookie*
 Title    Secondary Ion Microanalysis of Fluorine in Apatites of Biological Interest  
 Abstract    A Cameca IM S 300 ion analyzer has been used to measure fluorine concentrations in tooth material. Samples of human and shark teeth were studied. Negative oxygen primary ions produce secondary mass spectra in which positive as well as negative fluorine ion peaks are well re­ presented. W ith constant measuring conditions, the reproducibility of the F/Ca ion ratios is satis­ factory. Fluorine concentrations in the 10 ppm region are easily recorded. By means of samples previously measured by macroscopic F-determining methods, a calibration can be effected to ob­ tain, from the ion current ratios, at least semiquantitative values of F-concentrations. In a sample of human enamel, the F-concentration was found to vary from about 3000 ppm at the surface to about 100 ppm in the interior. In shark enamel the composition at the surface cor­ responded to nearly saturated fluorapatite, 3.6% F, but the fluorine concentration decreased distinctly at increasing depth. 
  Reference    (Z. Naturforsch. 29c, 417 [1974]; received February 18 1974) 
  Published    1974 
  Keywords    Microanalysis, Fluorine, Teeth, Apatites, Ion Microprobe 
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 TEI-XML for    default:Reihe_C/29/ZNC-1974-29c-0417.pdf 
 Identifier    ZNC-1974-29c-0417 
 Volume    29