ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
Collection
Keywords
Publisher
Years
  • 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
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 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
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 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
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 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
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 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
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 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
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    facet.materialart.
    Unknown
    Pore water rare earth element concentrations from the Oregon, USA margin
    PANGAEA
    In:  Supplement to: Abbott, April N; Haley, Brian A; McManus, James; Reimers, Clare (2015): The sedimentary flux of dissolved rare earth elements to the ocean. Geochimica et Cosmochimica Acta, 154, 186-200, https://doi.org/10.1016/j.gca.2015.01.010
    Details
    Publication Date: 2023-05-12
    Description: We determined pore fluid rare earth element (REE) concentrations in near-surface sediments retrieved from the continental margin off Oregon and California (USA). These sites represent shelf-to-slope settings, which lie above, within, and below the oxygen minimum zone of the Northeast Pacific. The sediments are characterized by varying degrees of net iron reduction, with pore fluids from the shelf sites being generally ferruginous, and the slope sediments having less-pronounced iron reduction zones that originate deeper in the sediment package. REE concentrations show maxima in shallow (upper 2-10 cm) subsurface pore fluids across all sites with concentrations that rise more than two orders of magnitude higher than seawater. These pore fluid enrichments highlight the importance of a sedimentary source of REEs to the ocean's water column. Here we use our measurements to estimate the diffusive flux of Nd out of ocean sediments resulting in a global flux between 18 and 110 × 10**6 mol Nd/yr. While we do assume that our pore fluid profiles as well as the very limited data previously published are representative of a wide array of ocean environments, this calculated flux can account for the modeled missing Nd source flux (76 × 10**6 mol Nd/yr) in global budgets (Arsouze et al., 2009). Pore fluid normalized REE patterns show distinct variation in the middle REE and heavy REE enrichments with sediment depth and amongst sites. These patterns show that the heavy REE enrichment of pore fluids at our deep slope site (3000 m water depth) is closest to the heavy REE enrichment of seawater. This observation supports the view that REE cycling within the upper ten centimeters of deep-sea marine sediments, as opposed to shallower continental shelf and slope sediments, plays a significant role in controlling the integrated global REE flux from the pore fluids and consequently the broad-scale REE pattern in seawater.
    Type: Dataset
    Format: application/zip, 3 datasets
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    DATA PANGAEA
  • 8
    facet.materialart.
    Unknown
    Nutrients in porewater of sediment profile 8BC27-3
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: 8BC27-3; Ammonium; Auto-analyzer, Technicon AA-II (Strickland & Parsons, 1972); BC; Box corer; Comment; DEPTH, sediment/rock; Fluoride; Ion selective probe; Manganese; Manganese, colorimetric, formaldoxim (Brewer & Spencer, 1971); Nitrate; Nitrite; Oxygen; Phosphate; Silicate; Silicon Cycling in the World Ocean; SINOPS
    Type: Dataset
    Format: text/tab-separated-values, 119 data points
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    DATA PANGAEA
  • 9
    facet.materialart.
    Unknown
    Nutrients in porewater of sediment profile 11.5BC46-2
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: 11.5BC46-2; Ammonium; Auto-analyzer, Technicon AA-II (Strickland & Parsons, 1972); BC; Box corer; Comment; DEPTH, sediment/rock; Fluoride; Ion selective probe; Manganese; Manganese, colorimetric, formaldoxim (Brewer & Spencer, 1971); Nitrate; Nitrite; Phosphate; Silicate; Silicon Cycling in the World Ocean; SINOPS
    Type: Dataset
    Format: text/tab-separated-values, 142 data points
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    DATA PANGAEA
  • 10
    facet.materialart.
    Unknown
    Nutrients in porewater of sediment profile 7BC26-1
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: 7BC26-1; Ammonium; Auto-analyzer, Technicon AA-II (Strickland & Parsons, 1972); BC; Box corer; Comment; DEPTH, sediment/rock; Fluoride; Ion selective probe; Manganese; Manganese, colorimetric, formaldoxim (Brewer & Spencer, 1971); Nitrate; Nitrite; Phosphate; Silicate; Silicon Cycling in the World Ocean; SINOPS
    Type: Dataset
    Format: text/tab-separated-values, 150 data points
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    DATA PANGAEA
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...