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  • 1
    Electronic Resource
    Electronic Resource
    Activity and distribution of bacterial populations in Middle Atlantic Bight shelf sands (2003)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology ecology 44 (2003), S. 0 
    Details
    ISSN: 1574-6941
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Spatiotemporal variation and metabolic activity of the microbial community were studied in coarse-grained Middle Atlantic Bight shelf sediments in relation to pools of dissolved and particulate carbon. Algal cells were present 8–〉70 μm) fraction of the sediment held the major share (61–98%) of benthic bacteria. Bacterial and algal cell abundances, exoenzymatic activity, and [DOC] generally showed higher values in May/July 2001 than in August/December 2000. Carbohydrates and proteins were hydrolyzed at potential rates of 1–12 nmol cm−3 h−1 (β-glucosidase) and 3–70 nmol cm−3 h−1 (aminopeptidase), respectively. Fluorescence in situ hybridization analyses of the benthic microbes assigned 45–56% of DAPI-stained cells to Eubacteria and less than 2% to Eukarya. The prokaryotic community was dominated by planctomycetes and members of the Cytophaga/Flavobacterium cluster. Near the sediment surface, iodonitrotetrazolium violet reducing cells, that are considered actively respiring, amounted to 15–29% of total bacteria. Despite a low organic content (particulate organic carbon 〈0.03%) and relatively low bacterial abundances (〈109 cm−3), the Middle Atlantic Bight shelf sediments showed organic matter turnover rates that are comparable to those found in organic-rich finer-grained deposits. Our findings suggest a high biocatalytic filtration activity in these coarse permeable sediments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6941.2003.tb01093.x
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  • 2
    Electronic Resource
    Electronic Resource
    Oxygen microprofiles measured in situ in deep ocean sediments (1986)
    [s.l.] : Nature Publishing Group
    Nature 320 (1986), S. 741-744 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Microelectrodes were first introduced as tools for obtaining small-scale oxygen distributions across the marine sediment-water interface in shallow waters by Revsbech et al5. When used with a separate reference electrode, these probes have a spatial resolution of 10-100 jxm, a 90% response time ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/320741a0
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  • 3
    Electronic Resource
    Electronic Resource
    Isotopic constraints on carbon exchange between deep ocean sediments and sea water (1995)
    [s.l.] : Nature Publishing Group
    Nature 373 (1995), S. 686-689 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Sediments were collected from two regions of the eastern North Pacific Ocean. Station N (35° 00' N, 123° 00' W) is located in 4,100m of water on the continental rise at the base of the Monterey deep sea fan9. Santa Monica basin (33° 45' N, 118° 45' W), a semi-enclosed, nearly anoxic ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/373686a0
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  • 4
    Electronic Resource
    Electronic Resource
    Carbon cycle Feedbacks from the sea floor (1998)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 391 (1998), S. 536-537 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The Earth's sedimentary rocks hold more than 107 gigatonnes of organic carbon of marine origin. Scientists see this as evidence that oxygen, produced by photosynthesis, was added to the ocean and the atmosphere in varying degrees, and at the expense of carbon dioxide, over geological ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/35262
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  • 5
    Electronic Resource
    Electronic Resource
    Harnessing microbially generated power on the seafloor (2002)
    [s.l.] : Nature Publishing Group
    Nature biotechnology 20 (2002), S. 821-825 
    Details
    ISSN: 1546-1696
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: [Auszug] In many marine environments, a voltage gradient exists across the water–sediment interface resulting from sedimentary microbial activity. Here we show that a fuel cell consisting of an anode embedded in marine sediment and a cathode in overlying seawater can use this voltage ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nbt716
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  • 6
    Electronic Resource
    Electronic Resource
    Benthic foraminiferal population fluctuations related to anoxia: Santa Barbara Basin (1991)
    Springer
    Biogeochemistry 15 (1991), S. 127-149 
    Details
    ISSN: 1573-515X
    Keywords: anoxia ; ATP ; foraminifera ; geochemistry ; organic-rich sediments ; ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract The pore-water geochemistry and benthic foraminiferal assemblages of sediments from two slope sites and within the central portion of the Santa Barbara Basin were characterized between February 1988 and July 1989. The highest foraminiferal numerical densities (1197 cm−3 as determined by an ATP assay) occurred at a slope site in June 1988 (550 m) in partially laminated sediments. In continuously laminated sediments from the central basin, foraminifera were found living (as determined by ATP assay) in October 1988 to depths of 4 cm, and specimens prepared for transmission electron microscopy were found with intact organelles to 3 cm, indicating their inhabitation of anoxic pore waters. Ultrastructural data from Nonionella stella is consistent with the hypothesis that this species can survive by anaerobic respiration. However, the benthic foraminifera appear unable to survive prolonged anoxia. The benthic foraminiferal population was completely dead in July 1989 when bottom water O2 was undetectable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00003221
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