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  • Inorganic Chemistry  (1)
  • Polymer and Materials Science  (1)
  • Analytical Chemistry and Spectroscopy
  • Bessel functions
  • Betulin
  • 1995-1999  (1)
  • 1955-1959  (1)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Deposition of collagen fibril bundles by long-term culture of fibroblasts in a collagen sponge (1996)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 32 (1996), S. 87-94 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: Human fibroblasts cultured for 10 days in a collagen sponge migrated through the pores of the sponge and expressed a moderate mitotic activity, which stabilized after 10 days, and a high collagen and protein synthesis. Between 10 and 27 days, the newly synthesized collagen filled the pores of the sponge. This matrix accumulation induced a delayed decrease of collagen and protein synthesis. Finally, after 27 days of culture, the fibroblasts expressed low bio-synthetic activities similar to the ones exhibited in vivo. The newly synthesized matrix was highly differentiated, as shown by the presence of a dense network of quarter-staggered collagen fibrils (42 nm ± 6 nm in diameter) surrounding the cells. The size and the shape of these fibrils demonstrated that the newly synthesized procollagen was fully processed in collagen by removal of their N- and C-terminal propeptides. Moreover, these fibrils were packed in bundles organized into an interwoven network that mimics the pattern of the papillary dermis. These findings show that fibroblasts cultured for one month in a collagen sponge construct large amounts of a highly differentiated connective tissue. © 1996 John Wiley & Sons, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 2
    Electronic Resource
    Electronic Resource
    Hydrothermalsynthese von Calcium-Apatiten (1958)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 295 (1958), S. 241-246 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Crystalline hydroxy-apatite can be prepared by hydrothermal synthesis at 400° C in the range of pH of 5 to 11. With the exception of CaHPO4 which is formed at a pH of 4.5 in addition to apatite, no other calcium phosphates occurs. Complete substitution of OH- by F- can be achieved in the presence of KF.The crystallisation of apatite is disturbed by CO3---ions, there is, however, no entering of carbonate ions into the lattice of apatite.
    Notes: Hydroxylapatit wird durch Druckbehandlung bei 400° in Natriumphosphat-Puffersystemen im pH-Gebiet von 11 bis 5 kristallin erhalten, bei pH 4,5 zusammen mit CaHPO4. Andere Calciumphosphate treten nicht auf, auch nicht im System Ca++—(PO4)3-—Ca(OH)2—H2O. Im gepufferten System mit KF kann ein vollkommener Ersatz von OH- durch F- erfolgen, nicht aber durch Cl-. CO3-- stört die Kristallisation, ohne daß das Carbonat-Ion in das Apatitgitter eintritt.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19582950311
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