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  • 1
    Electronic Resource
    Electronic Resource
    Energetics of syntrophic ethanol oxidation in defined chemostat cocultures (1990)
    Springer
    Archives of microbiology 155 (1990), S. 82-88 
    Details
    ISSN: 1432-072X
    Keywords: Homoacetogenesis ; Methanogenesis ; Sulfate reduction ; Caffeate reduction ; Nitrate reduction ; Interspecies H2 transfer ; Affinity ; H2 threshold ; “Critical” Gibbs free energy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The ethanol-oxidizing, proton-reducing Pelobacter acetylenicus was grown in chemostat cocultures with either Acetobacterium woodii, Methanobacterium bryantii, or Desulfovibrio desulfuricans. Stable steady state conditions with tightly coupled growth were reached at various dilution rates between 0.02 and 0.14 h-1. Both ethanol and H2 steady state concentrations increased with growth rate and were lower in cocultures with the sulfate reducer 〈 methanogen 〈 homoacetogen. Due to the higher affinity for H2, D. desulfuricans outcompeted M. bryantii, and this one A. woodii when inoculated in cocultures with P. acetylenicus. Cocultures with A. woodii had lower H2 steady state concentrations when bicarbonate reduction was replaced by the energetically more favourable caffeate reduction. Similarly, cocultures with D. desulfuricans had lower H2 concentrations with nitrate than with sulfate as electron acceptor. The Gibbs free energy (ΔG) available to the H2-producing P. acetylenicus was independent of growth rate and the H2-utilizing partner, whereas the ΔG available to the latter increased with growth rate and the energy yielding potential of the H2 oxidation reaction. The “critical” Gibbs free energy (ΔGc), i.e. the minimum energy required for H2 production and H2 oxidation, was-5.5 to-8.0 kJ mol-1 H2 for P. acetylenicus,-5.1 to-6.3 kJ mol-1 H2 for A. woodii,-7.5 to-9.1 kJ mol-1 H2 for M. bryantii, and-10.3 to-12.3 kJ mol-1 H2 for D. desulfuricans. Obviously, the potentially available energy was used more efficiently by homoacetogens 〉 methanogens 〉 sulfate reducers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00291279
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    Paper (German National Licenses)
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  • 2
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    Multiple ionization and fragmentation of isolated pyrene and coronene molecules in collision with ions (2011)
    American Physical Society (APS)
    Details
    Publication Date: 2011-02-09
    Description: Author(s): A. Ławicki, A. I. S. Holm, P. Rousseau, M. Capron, R. Maisonny, S. Maclot, F. Seitz, H. A. B. Johansson, S. Rosén, H. T. Schmidt, H. Zettergren, B. Manil, L. Adoui, H. Cederquist, and B. A. Huber The interaction of multiply charged ions (He^{2+} , O^{3+} , and Xe^{20+} ) with gas-phase pericondensed polycyclic aromatic hydrocarbon (PAH) molecules of coronene (C_{24} H_{12} ) and pyrene (C_{16} H_{10} ) is studied for low-velocity collisions (v⩽0.6 a.u.). The mass spectrometric analysis sho... [Phys. Rev. A 83, 022704] Published Tue Feb 08, 2011
    Keywords: Atomic and molecular collisions and interactions
    Print ISSN: 1050-2947
    Electronic ISSN: 1094-1622
    Topics: Physics
    Published by American Physical Society (APS)
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