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  • 1
    Electronic Resource
    Electronic Resource
    Electron flow to dimethylsulphoxide or trimethylamine-N-oxide generates a membrane potential in Rhodopseudomonas capsulata (1983)
    Springer
    Archives of microbiology 136 (1983), S. 300-305 
    Details
    ISSN: 1432-072X
    Keywords: Photosynthetic bacteria ; Electron transport ; Rhodopseudomonas capsulata ; Membrane potential ; Dimethylsulphoxide ; Trimethylamine-N-oxide ; Fermentation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Under dark and essentially anaerobic conditions electron flow to either dimethylsulphoxide or trimethylamine-N-oxide in cells of Rhodopseudomonas capsulata has been shown to generate a membrane potential. This conclusion is based on the observation of a red shift in the carotenoid absorption band which is a well characterised indicator of membrane potential in this bacterium. The magnitude of the dimethylsulphoxide- or trimethylamine-N-oxide-dependent membrane potential was reduced either by a protonophore uncoupler of oxidative phosphorylation or synergistically by a combination of a protonophore plus rotenone, an inhibitor of electron flow from NADH dehydrogenase. These findings, together with the observation that venturicidin, an inhibitor of the proton translocating ATPase, did not reduce the membrane potential, show that electron flow to dimethylsulphoxide or trimethylamine-N-oxide is coupled to proton translocation. Thus contrary to some previous proposals dark and anaerobic growth of Rps. capsulata in the presence of dimethylsulphoxide or trimethylamine-N-oxide cannot be regarded as purely fermentative.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00425221
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The role of auxiliary oxidants in maintaining redox balance during phototrophic growth of Rhodobacter capsulatus on propionate or butyrate (1988)
    Springer
    Archives of microbiology 150 (1988), S. 131-137 
    Details
    ISSN: 1432-072X
    Keywords: Photosynthetic bacteria (Rhodobacter capsulatus) ; Phototrophic growth ; Nitrate reduction ; TMAO reduction ; Redox balance ; NMR assay
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Phototrophic growth of Rhodobacter capsulatus (formerly Rhodopseudomonas capsulata) under anaerobic conditions with either butyrate or propionate as carbonsource was dependent on the presence of either CO2 or an auxiliary oxidant. NO - 3 , N2O, trimethylamine-N-oxide (TMAO) or dimethylsulphoxide (DMSO) were effective provided the appropriate anaerobic respiratory pathway was present. NO - 3 was reduced extensively to NO - 3 , TMAO to trimethylamine and DMSO to dimethylsulphide under these conditions. Analysis of culture fluids by nuclear magnetic resonance showed that two moles of TMAO or DMSO were reduced per mole of butyrate utilized and one mole of either oxidant was reduced per mole of propionate consumed. The growth rate of Rb. capsulatus on succinate or malate as carbon source was enhanced by TMAO in cultures at low light intensity but not at high light intensities. A new function for anaerobic respiration during photosynthesis is proposed: it permits reducing equivalents from reduced substrates to pass to auxiliary oxidants present in the medium. The use of CO2 or auxiliary oxidants under phototrophic conditions may be influence by the availability of energy from light. It is suggested that the nuclear magnetic resonance methodology developed could have further applications in studies of bacterial physiology.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00425152
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    Paper (German National Licenses)
    Fulltext
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