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  • 1
    Book
    Book
    Ecology and evolution in anoxic worlds (1995)
    Oxford [u.a.] : Oxford University Press
    Details Availability
    Keywords: Biology ; Anaerobiosis ; Evolution ; Anaerobiose ; Ökologie ; Anaerobiose ; anaerobiosis ; Anaerobiose ; Anaerobier
    Type of Medium: Book
    Pages: XII, 276 S. , graph. Darst.
    ISBN: 0198548389 , 0198548370
    Series Statement: Oxford series in ecology and evolution
    URL: http://www.gbv.de/dms/bs/toc/165405791.pdf
    URL: http://www.gbv.de/dms/bs/toc/165405791.pdf
    URL: http://www.loc.gov/catdir/enhancements/fy0603/94035058-d.html
    URL: http://www.loc.gov/catdir/enhancements/fy0603/94035058-t.html
    DDC: 574.526
    RVK:
    WF 2500
    Language: English
    Note: Literaturverz. S. [238] - 266
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  • 2
    Electronic Resource
    Electronic Resource
    Oxygen Uptake and Antioxidant Responses of the Free-Living Diplomonad Hexamita sp. (1997)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 44 (1997), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: . The free-living anaerobic flagellate Hexamita sp. was observed to actively consume O2 with a Km O2 of 13 μM. Oxygen consumption increased lineraly with O2 tension up to a threshold level of 100 μM, above which it was inhibited. Oxygen uptake was supported by a number of substrates but probably not coupled to energy conservation as cytochromes could not be detected spectro-photometrically. In addition, inhibitors specific for respiratory chain components did not significantly affect O2 uptake. Respiration was however, partially inhibited by flavoprotein and iron-sulfur protein inhibitors. NAD(P)H supported O2 consumption was measured in both particulate and soluble fractions; this activity was partially inhibited by quinacrine. A chemosensory response was observed in cells exposed to air, however no response was observed in the presence of superoxide dismutase plus catalase. Catalase and nonspecific peroxidase activity could not be detected, but superoxide dismutase activity was present. Superoxide dismutase was sensitive to NaN3 and H2O2 but not KCN, suggesting a Fe prosthetic group. Flow cytometric analysis revealed that thiol levels in live cells were depleted in the presence of t-butyl H2O2. The observed NADPH-driven glutathione reductase activity is believed to recycle oxidized thiols in order to re-establish reduced thiol levels in the cell. The corresponding thiol cycling enzyme glutathione peroxidase could not be detected. The ability to withstand high O2 tensions (100 μM) would enable Hexamita to spend short periods in a wider range of habitats. Prologed exposure to O2 tensions higher than 100 μM leads to irreversible damage and cell death.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1997.tb05722.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Ubiquitous dispersal of microbial species (1999)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 400 (1999), S. 828-828 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The biosphere supports astronomical numbers of free-living microorganisms that belong to an indeterminate number of species. One view is that the abundance of microorganisms drives their dispersal, making them ubiquitous and resulting in a moderate global richness of species. But ubiquity is ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/23616
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  • 4
    Electronic Resource
    Electronic Resource
    Global diversity and body size (1996)
    [s.l.] : Nature Publishing Group
    Nature 383 (1996), S. 132-133 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR á€" Siemann et all trapped an impressive variety of insects by sweep-netting the grasslands and savannahs at Cedar Creek, Minnesota. Equally impressive is their demonstration of coincident peaks for species richness (S) and total insect abundance (/) in medium-sized insects, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/383132a0
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  • 5
    Electronic Resource
    Electronic Resource
    Evolution of the hydrogenosome (1997)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 155 (1997), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Since its discovery almost 25 years ago the enigmatic hydrogenosome, a redox organelle of anaerobic unicellular eukaryotes, has puzzled evolutionists as to its origin and function. Synthesis of recent molecular, physiological and morphological studies now favours the hypothesis that hydrogenosomes derived from a modification of pre-existing mitochondria, and argues against the previously held view that the hydrogenosome had a polyphyletic origin. These data provide evidence for a more ancient origin of mitochondria than hitherto thought.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1997.tb13869.x
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  • 6
    Electronic Resource
    Electronic Resource
    Protozoan stimulation of anaerobic microbial activity: enhancement of the rate of terminal decomposition of organic matter (1998)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology ecology 27 (1998), S. 0 
    Details
    ISSN: 1574-6941
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Anaerobic microcosms were established in which plant material was degraded by the co-operative interaction of various bacterial metabolic types, and the production of CH4 and sulfide was monitored. The introduction of the anaerobic ciliate Metopus palaeformis resulted in a reduction of bacterial abundance but an increase in the rate of CH4 and sulfide production. The enhanced bacterial activity (resulting in an increased rate of bacterial CH4 production) was positively correlated with the number of ciliates present. The endosymbiotic methanogens of M. palaeformis did not contribute significantly to the observed increase in CH4 production. It was concluded that protozoan excretions such as organic acids (acetate, propionate) were most likely responsible. Protozoa have previously been shown to enhance bacterial activity in aerobic systems, but this is the first report of the phenomenon in anaerobic systems. Bacterial stimulation by protozoan grazing signifies the importance of anaerobic protozoa in the natural environment, not just in controlling bacterial numbers but also in vitalising ecosystem function.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6941.1998.tb00520.x
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    Paper (German National Licenses)
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