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  • 1
    Digitale Medien
    Digitale Medien
    Characterization of tension and normally lignified wood cellulose inPopulus maximowiczii (1995)
    Springer
    Cellulose 2 (1995), S. 223-233 
    Details
    ISSN: 1572-882X
    Schlagwort(e): wood cellulose ; two crystalline phase system ; CP/MAS13C NMR ; FT-IR ; electron diffraction ; X-ray diffraction
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Abstract We have investigated unlignified tension wood and normally lignified wood celluloses inPopulus maximowiczii with particular reference to the composition of two crystalline phases Iα/Iβ (triclinic/ monoclinic). Four independent techniques, which enable us to detect the two phases, CP/MAS13C NMR, Fourier transform infrared microscopy, selected-area electron diffraction, and X-ray diffraction were applied. Because of the low crystallinity of wood celluloses, particularly in the case of celluloses in the lignified cell wall, no single method was decisive enough to be able to determine the composition of the two phases as one can with highly crystalline materials. The Iβ dominant structure (monoclinic crystal type) was, however, preferred for both tension and normal wood celluloses.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00811814
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    In situ crystallization of bacterial cellulose II. Influences of different polymeric additives on the formation of celluloses Iα and Iβ at the early stage of incubation (1996)
    Springer
    Cellulose 3 (1996), S. 229-242 
    Details
    ISSN: 1572-882X
    Schlagwort(e): bacterial cellulose ; Acetobactor xylinum ; cellulose crystals ; CPMAS13C NMR ; FT-IR ; xyloglucan ; carboxymethyl cellulose
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Abstract Effects of polymeric additives with different degrees of polymerization (DP) or substitution (DS) on the crystallization of celluloses Iα and Iβ have been examined at an early stage of the incubation of Acetobactor xylinum by using newly developed FT-IR spectroscopy. It was found that the mass fraction of cellulose Iα is greatly decreased with increasing concentrations of carboxymethyl cellulose sodium salt (CMC) or xyloglucan (XG) in the incubation medium. Such a decrease in the mass fraction of cellulose Iα, which corresponds to the enhanced crystallization of cellulose Iβ, is more prominent for CMC or XG with lower DPs, but the additives with too low DPs are not so effective probably due to higher solubility and the lower adhesion on the surface of microfibrils. Moreover, the mass fractions of celluloses Iα and Iβ are highly correlated with the crystallite size of microfibrils, indicating that Iα is crystallized in larger-size microfibrils while Iβ is produced in smaller-size microfibrils. On the basis of these experimental results, the mechanism of the crystallization of celluloses Iα and Iβ is discussed in the Acetobactor xylinum system.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02228804
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Infrequent genetic alterations of the PTEN gene in Japanese patients with sporadic prostate cancer (1998)
    Springer
    Journal of human genetics 43 (1998), S. 228-230 
    Details
    ISSN: 1435-232X
    Schlagwort(e): Key wordsPTEN gene ; Prostate cancer ; Loss of heterozygosity (LOH) ; Tumor suppressor gene ; Chromosome 10q
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Abstract Prostate cancer is a major cause of cancer death among elderly men in America, Europe, and Japan. However, the molecular mechanism of carcinogenesis is not yet well characterized. Frequent loss of heterozygosity (LOH) on chromosome 10q was reported in prostate cancer, and a candidate tumor suppressor gene, PTEN, was isolated on chromosome band 10q23.3. To investigate the genetic alterations of PTEN, we examined 45 primary prostate cancer specimens. LOH at the PTEN locus was observed in two (11.1%) of 18 tumors. However, no mutations were observed in any of the primary prostate cancers. These data suggest that mutation of the PTEN gene does not play a major role in prostate carcinogenesis of Japanese patients.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s100380050078
    Standort Signatur Erwartet Verfügbarkeit
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