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  • 1
    Electronic Resource
    Electronic Resource
    Organic geochemical evidence for environmental changes since 34,000 yrs BP from Lago di Mezzano, central Italy (1999)
    Springer
    Journal of paleolimnology 22 (1999), S. 349-365 
    Details
    ISSN: 1573-0417
    Keywords: Lago di Mezzano ; Hydrogen Index ; lipids ; autochthonous organic matter ; allochthonous organic matter
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Notes: Abstract The composition of organic matter in a 34,000 yr sediment profile from Lago di Mezzano, central Italy, was investigated by bulk organic geochemical methods and analyses of lipid distributions. High relative amounts of long-chain fatty acids, n-alkanols and n-alkanes from the cuticular waxes of terrestrial plants in the Late Pleistocene sediments indicate a high relative proportion of allochthonous organic matter. In the Holocene sediments higher relative amounts of algal and bacterial lipids are detected which indicate a higher relative contribution of autochthonous organic matter. These results are corroborated by Hydrogen Index (HI) and Oxygen Index (OI) values from Rock-Eval pyrolysis which show a good general correlation with the TOC content indicating significant variations of the organic matter composition. Variations of HI and OI observed for different lithozones of the sediment profile can be related to environmental and climatic changes throughout the lake history. Both bulk organic geochemical and molecular data point to a good overall preservation of the organic matter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008051821898
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  • 2
    Electronic Resource
    Electronic Resource
    Biotransformation of diphenyl ether by the yeastTrichosporon beigelii SBUG 752 (1995)
    Springer
    Biodegradation 6 (1995), S. 173-180 
    Details
    ISSN: 1572-9729
    Keywords: aromatic ring cleavage ; degradation ; dioxin like compounds ; diphenyl ether ; Trichosporon beigelii
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Trichosporon beigelii SBUG 752 was able to transform diphenyl ether. By TLC, HPLC, GC, GC-MS, NMR- and UV-spectroscopy, several oxidation products were identified. The primary attack was initiated by a monooxygenation step, resulting in the formation of 4-hydroxydiphenyl ether, 2-hydroxydiphenyl ether and 3-hydroxydiphenyl ether (48:47:5). Further oxidation led to 3,4-dihydroxydiphenyl ether. As a characteristic product resulting from the cleavage of an aromatic ring, the lactone of 2-hydroxy-4-phenoxymuconic acid was identified. The possible mechanism of ring cleavage to yield this metabolite is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00695348
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    Paper (German National Licenses)
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