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  • 1990-1994  (6)
Document type
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    A Sea of Change: Monitoring the Oceans' Carbon Cycle (1991)
    s.l. : American Chemical Society
    Environmental science & technology 25 (1991), S. 1977-1981 
    Details
    ISSN: 1520-5851
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/es00024a600
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Production and transport of methane in oceanic particulate organic matter (1994)
    [s.l.] : Nature Publishing Group
    Nature 368 (1994), S. 732-734 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Experiments were performed at five North Pacific ocean stations during cruises of the Vertical Transport and Exchange (VERTEX) and Asian Dust Inputs to the Oceans (ADIOS) research programmes. Two coastal (both at 35.8á° N, 122.6á° W), one transition (33.3á° N, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/368732a0
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Elevated consumption of carbon relative to nitrogen in the surface ocean (1993)
    [s.l.] : Nature Publishing Group
    Nature 363 (1993), S. 248-250 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Conversions such as that from nitrate consumption to organic carbon production are crucial both to account for the ocean's role in the global carbon cycle and to relate the net production of organic matter (based on O2 budgets), new production and carbon flux quantitatively12'15. There have, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/363248a0
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Nitrogen metabolism by heterotrophic bacterial assemblages in Antarctic coastal waters (1994)
    Springer
    Polar biology 14 (1994), S. 195-204 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Field studies to examine the in situ assimilation and production of ammonium (NH4 +) by bacterial assemblages were conducted in the northern Gerlache Strait region of the Antarctic Peninsula. Short term incubations of surface waters containing 15N-NH4 + as a tracer showed the bacterial population taking up 0.041–0.128 μg-atoms Nl−1d−1, which was 8–25% of total NH4 + uptake rates. The large bacterial uptake of NH4 + occurred even at low bacterial abundance during a rich phytoplankton bloom. Estimates of bacterial production using 3H-leucine and -adenine were l.0μgCl−1 d−1 before the bloom and 16.2 μg Cl−1 d−1 at the bloom peak. After converting bacterial carbon production to an estimate of nitrogen demand, NH4 + was found to supply 35–60% of bacterial nitrogen requirements. Bacterial nitrogen demand was also supported by dissolved organic nitrogen, generally in the form of amino acids. It was estimated, however, that 20–50% of the total amino acids taken up were mineralized to NH4 +. Bacterial production of NH4 + was occurring simultaneously to its uptake and contributed 27–55% of total regenerated NH4 + in surface waters. Using a variety of 15N-labelled amino acids it was found that the bacteria metabolized each amino acid differently. With their large mineralization of amino acids and their relatively low sinking rates, bacteria appear to be responsible for a large portion of organic matter recycling in the upper surface waters of the coastal Antarctic ecosystem.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00240524
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    The grounding of the Bahia Paraiso: Microbial ecology of the 1989 Antarctic oil spill (1992)
    Springer
    Microbial ecology 24 (1992), S. 77-89 
    Details
    ISSN: 1432-184X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract On 28 January 1989 the Bahia Paraiso ran aground and sank near Palmer Station, Antarctica. At least 6.8 × 105 liters of diesel fuel arctic (DFA) were released into semi-enclosed Arthur Harbor and deposited in the nearby intertidal regions. Approximately 6 weeks later, a group of scientists was deployed to evaluate the impact of the oil spill on the surrounding coastal marine ecosystem. Microbial hydrocarbon oxidation potential (14CO2 evolved from 14C-labeled hexadecane) was detected throughout both the oil-impacted and control regions. Hexadecane was mineralized at extremely low rates (0.13–1.21 pmol g−1 sediment dry weight day−1); microbiological turnover time exceeded 2 years. The acute effects of DFA (measured over exposure periods of 3–7 days) on the metabolic activities of sedimentary microorganisms appear to be negligible even at seawater saturation concentrations of DFA. Long-term exposure (120 days) to varying concentrations of DFA resulted in significant decreases (〉90%) in total ATP, but had either no effect or a slight stimulatory effect on metabolic activity and production. In contrast to planktonic microbial communities, increasing incubation temperatures of between 0 and 30°C had a positive effect on rates of metabolism and production of sedimentary assemblages. These results may influence the overall weathering rates of hydrocarbons deposited in the intertidal and supratidal regions of Arthur Harbor and other polar regions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00171972
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    Paper (German National Licenses)
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  • 6
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    Unknown
    Hawaii Ocean Time-series Program Data Report 1, 1988-1989 (1990)
    PANGAEA
    In:  EPIC3SOEST Technical Report #1, School of Ocean and Earth Science and Technology, University of Hawaii, Honolulu, HI, Bremerhaven, PANGAEA, 269 p.
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: PANGAEA Documentation , notRev
    Format: application/pdf
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    PAPER (OA)
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