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  • 1
    Electronic Resource
    Electronic Resource
    Metabolism of pyridine and 3-hydroxypyridine under aerobic, denitrifying and sulfate-reducing conditions (1991)
    Springer
    Cellular and molecular life sciences 47 (1991), S. 292-296 
    Details
    ISSN: 1420-9071
    Keywords: Pyridine metabolism ; hydroxypyridines ; anaerobiosis ; denitrifying conditions ; sulfate-reducing conditions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The transformation of pyridine and several hydroxypyridines was investigated under different physiological conditions. Pyridine and 2-, 3- and 4-hydroxypyridine were metabolized aerobically within 9 days in a mineral salt medium inoculated with 10% sewage sludge. Under anaerobic conditions in the presence of nitrate or sulfate, pyridine and 3-hydroxypyridine were metabolized after a lag period of 2 months, while no transformation of 2- or 4-hydroxypyridine was detected. Experiments with14C-labeled-pyridine showed that under denitrifying as well as under sulfate-reducing conditions pyridine was oxidized to carbon dioxide. Disappearance of nitrate and sulfate under anaerobic conditions was 79% and 85%, respectively, of the amount predicted from the stoichiometric equation for the complete transformation of pyridine.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01958164
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The effect of pH on the transformation of syringic and vanillic acids by the laccases of Rhizoctonia praticola and Trametes versicolor (1984)
    Springer
    Archives of microbiology 137 (1984), S. 89-96 
    Details
    ISSN: 1432-072X
    Keywords: Laccase ; Syringic acid ; Vanillic acid ; 2-methoxy-1,4-benzoquinone ; Rhizoctonia praticola ; Trametes versicolor
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Laccases (benzenediol: oxygen oxidoreductases, EC 1.10.3.2) from Rhizoctonia praticola and Trametes versicolor formed different products from syringic and vanillic acids at different pH values, but both enzymes generated the same chemicals at a particular pH. The products were separated by thin-layer and high-performance liquid chromatography. Four compounds were determined from syringic acid (m/z 168, 334, 350 and 486) at pH 6.9, but only two of these (m/z 168 and 334) were found at pH 3.5. In the case of vanillic acid two isomeric dimers (m/z 304) and 2-methoxy-1,4-benzoquinone (m/z 138) were identified. The dimers were formed at both pH values (pH 3.5 and 6.9), but 2-methoxy-1,4-benzoquinone appeared only at pH 3.5.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00414446
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    Paper (German National Licenses)
    Fulltext
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