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  • Electronic Resource  (2)
  • 1985-1989  (2)
  • (Presbytis francoisi)  (1)
  • 13C-NMR  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Influence of nitrogen availability on agar-polysaccharides fromGracilaria verrucosa strain G-16: structural analysis by NMR spectroscopy (1989)
    Springer
    Journal of applied phycology 1 (1989), S. 53-58 
    Details
    ISSN: 1573-5176
    Keywords: agarose ; Gracilaria ; algae ; polysaccharide ; 13C-NMR ; agar
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The influence of nitrogen availability on the chemical structure of agar polymers isolated fromGracilaria verrucosa strain G-16 was ascertained by sequential solvent extraction and carbon 13 nuclear magnetic resonance (13C NMR) spectroscopy. Agar isolated fromG. verrucosa strain G-16 cultured under nitrogen limited conditions showed large non-polar components but produced spectra indicative of only minor amounts of methylation. These agars also produced spectra suggesting the presence of floridean starch. The nitrogen supplemented cultures ofG. verrucosa strain G-16 produced agars of a more polar nature (hot-water soluble) and contained little detectable starch. The data suggest that the higher gelling temperatures of agar from nitrogen limited plants is not due to markedly higher methylation. These data also suggest that nitrogen effects on agar content may not be as significant as previously thought.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00003535
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Taxonomy and distribution of the françois' langur (Presbytis francoisi) (1989)
    Springer
    Primates 30 (1989), S. 233-240 
    Details
    ISSN: 0032-8332
    Keywords: François' langur ; (Presbytis francoisi) ; Subspecies ; Taxonomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract This paper discusses the taxonomy and distribution ofPresbytis francoisi. We are especially concerned with the classification of the white-headed langur.T'an (1957) suggested that the white-headed langur be classified as a separate species,Presbytis leucocephalus. We suggest that the white-headed langur is a subspecies ofPresbytis francoisi and should be referred to asP. francoisi leucocephalus. The distribution of the six subspecies of the françois' langur,P. f. delacouri, P. f. francoisi, P. f. hatinhensis, P. f. laotum, P. f. leucocephalus, andP. f. poliocephalus, is limited to southeastern Asia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02381308
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    Paper (German National Licenses)
    Fulltext
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