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  • Blackwell Publishing Ltd  (2)
  • AGU (American Geophysical Union)  (1)
  • Schweizerbart  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Hydrogen production during fermentation of acetoin and acetylene by Pelobacter acetylenicus (1990)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 71 (1990), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract Pelobacter acetylenicus accumulated only small amounts of H2 (〈 3.5 kPa) during fermentation of acetoin or acetylene to acetate and ethanol. Formate was also produced in small amounts (〈 0.5 mM). Growth on acetoin was retarded by addition of ethanol, but not by addition of H2 or formate. However, addition of H2 and/or formate resulted in increased production of 2,3-butanediol, whereas addition of H2-scavenging Methanospirillum hungatei resulted in production of acetate plus H2 (as CH4) instead of acetate plus ethanol. Growth yields were consistent with acetate kinase as the sole ATP-generating reaction. The results are discussed with respect to thermodynamics and ATP synthesis during substrate conversion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1990.tb03802.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Thermodynamics of hydrogen metabolism in methanogenic cocultures degrading ethanol or lactate (1988)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 55 (1988), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Pure cultures of Desulfovibrio vulgaris or Pelobacter acetylenicus do not grow with lactate or ethanol, respectively, under obligately proton- reducing conditions. However, a small part of these substrates was oxidized and molecular hydrogen was produced up to 4.2 and 3.2 kPa, respectively. During growth in syntrophic methanogenic cocultures with Methanospirillum hungatei as partner, maximum hydrogen partial pressures were significantly lower (0.7 to 2.5 kPa) than in the corresponding pure cultures. Calculation of Gibbs free energies for the prevailing culture conditions showed that H2 partial pressures were kept in a range at which both, H2-producing and H2-consuming reactions, were thermodynamically permissive in pure as well as in syntrophic mixed cultures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1988.tb13918.x
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    Paper (German National Licenses)
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  • 3
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    Estimation of emplacement pressure for 2350 Ma high-Mg tholeiite dykes, Vestfold Hills, Antarctica (1994)
    Schweizerbart
    Details
    Publication Date: 1994-03-31
    Print ISSN: 0935-1221
    Electronic ISSN: 1617-4011
    Topics: Geosciences
    Published by Schweizerbart
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    PAPER CURRENT
  • 4
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    Assessment of Chalk as an Archive for the Lithium Isotope Composition of Seawater (2024)
    AGU (American Geophysical Union) | Wiley
    Details
    Publication Date: 2024-02-23
    Description: The understanding of silicate weathering and its role as a sink for atmospheric CO 2 is important to get a better insight into how the Earth shifts from warm to cool climates. The lithium isotope composition (δ 7 Li) of marine carbonates can be used as a proxy to track the past chemical weathering of silicates. A high‐resolution δ 7 Li record would be helpful to evaluate the role of silicate weathering during the late Cretaceous climate cooling. Here, we assess chalk as a potential archive for reconstructing Late Cretaceous seawater Li isotope composition by comparing Maastrichtian chalk from Northern Germany (Hemmoor, Kronsmoor) to a Quaternary coccolith ooze from the Manihiki Plateau (Pacific Ocean) as a lithological analog to modern conditions. We observe a negative offset of 3.9 ± 0.6‰ for the coccolith ooze relative to the modern seawater Li isotope composition (+31.1 ± 0.3‰; 2SE; n = 54), a value that falls in the range of published offsets for modern core‐top samples and for brachiopod calcite. Further, the negative offset between the Li isotope compositions of Manihiki coccolith ooze and modern planktonic foraminifera is 2.3 ± 0.6‰. Although chalk represents a diagenetically altered modification of pelagic nannofossil ooze, manifested by changes in the composition of trace elements, we observe a consistent offset of Li isotope data between Maastrichtian chalk and Maastrichtian planktonic foraminiferal data (−1.4 ± 0. 5‰) that lies within the uncertainty of modern values. We therefore suggest that chalk can be used as a reliable archive for δ 7 Li reconstructions. Key Points Chalk is a reliable archive for the Li isotope composition of seawater Coccolith ooze has a negative offset of 3.9 ± 0.6‰ from modern seawater for Li isotope ratios The estimated mean value for the late Maastrichtian seawater Li isotope composition is +27.5 ± 1.0‰
    Type: Article , PeerReviewed
    Format: text
    Format: text
    Format: other
    Format: other
    Format: other
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    PAPER (OCEANREP)
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