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  • 1
    Electronic Resource
    Electronic Resource
    Solid-state nuclear magnetic resonance (NMR): Application to precursors of ceramics—Polycarbosilane (1992)
    Springer
    Journal of inorganic and organometallic polymers and materials 2 (1992), S. 269-279 
    Details
    ISSN: 1572-8870
    Keywords: 29Si NMR ; magic-angle spinning ; CP/MAS NMR ; polycarbosilane ; electron irradiation curing ; 1H CRAMPS NMR
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The chemical structures of oxidation- and electron irradiation-cured polycarbosilane fibers has been studied by IR and chemical analysis, but its structure has not been identified in detail. In this work, the chemical structure and curing mechanism was examined by solid-state high-resolution NMR spectroscopy. From the analysis of NMR spectra, it is explained that (i) in oxidation curing of PCS fibers, oxygen attacks first the SiC3H bond and forms the SiC3O bond and, next, the SiC4 backbone bond and forms the SiC2O2 units; (ii) in electron irradiation curing, the signal intensity of SiC3H units decreases with the increase in dose, the increase in the signal being due to the formation of SiC4 units; (iii) solid-state29Si high-resolution (CP/MAS) NMR spectroscopy is a powerful tool for investigating the chemical structure and curing mechanism of PCS fibers complementing infrared and solid-state13C high-resolution NMR spectroscopy; and (iv)1H CRAMPS NMR spectroscopy is very useful for investigating the chemical structure and curing mechanism of PCS fibers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00696552
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  • 2
    Electronic Resource
    Electronic Resource
    Cell cycle-dependent expression of the mouseRad51 gene in proliferating cells (1996)
    Springer
    Molecular genetics and genomics 251 (1996), S. 1-12 
    Details
    ISSN: 1617-4623
    Keywords: DNA repair ; DNA replication ; Homologous recombination ; Meiosis ; RecA gene
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The mouseRad51 gene is a mammalian homologue of theEscherichia coli recA and yeastRAD51 genes, both of which are involved in homologous recombination and DNA repair in mitosis and meiosis. The expression of mouseRad51 mRNA was examined in synchronized mouse m5S cells. TheRad51 transcript was observed from late G1 phase through to M phase. During the period of late G1-S-G2, the RAD51 proteins were observed exclusively in nuclei. Activation by mitogens of T cell and B cell proliferation in spleen induced the expression ofRad51 mRNA. By immunohistochemical analyses, the mouse RAD51 protein was detected in proliferating cells: spermatogonia in testis, immature T cells in thymus, germinal center cells of the secondary lymphatic nodules of spleen and intestine, follicle cells in ovary and epithelial cells in uterus and intestine. It was also expressed in spermatocytes during early and mid-prophase of meiosis and in resting oocytes before maturation. Thus, mouseRad51 expression is closely related to the state of cell proliferation and is presumably involved in DNA repair coupled with DNA replication, as well as in meiotic DNA recombination in spermatocytes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02174338
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    Paper (German National Licenses)
    Fulltext
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