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  • 1995-1999  (5)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    The depositional environment of the Laptev Sea continental margin: Preliminary results from the R/v polarstern ARK IX-4 cruise (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Polar research 14 (1995), S. 0 
    Details
    ISSN: 1751-8369
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geography , Geosciences
    Notes: Marine geological investigations were performed across the Laptev Sea continental shelf and slope. Thirty sampling sites were selected covering a depth range of ca 3500 m. Maximum core recovery was 9 m. PARASOUND sub-bottom profiling was used for site surveying and provided important information on the depositional environment of the continental margin together with sedimentological and stratigraphical investigations.Undisturbed horizontal layering of the sea-floor sediments is a common feature for the Laptev Sea shelf. There is no indication for glaciation of the broad shelf region during the Last Glacial, since moraine deposits are missing. However, a high number of plough marks in places points to recent to sub-recent ice-erosion which has led to an intensive sediment reworking on the shelf. Several broadly incised river channels recorded near the shelf edge are related to Pleistocene drainage systems of large Siberian rivers which cut into the dry shelves during the Last Glacial Maximum and were subsequently filled during the Holocene. During the Last Glacial we therefore suspect a significant freshwater contribution from the Eurasian continent to the Arctic Oceans.The composition of the normally consolidated core sediments indicates a strong flux of terrigenous material, which is mainly provided by the Siberian rivers. Currents distributing the suspension load and sea ice are supposedly major agents transporting sediments across the shelf to the central arctic deep sea basin.Sediment cores from the upper and middle continental slope exhibit only minor lithological changes. Bioturbated, fine-grained sediments with high organic carbon contents dominate. The presence of free hydrogen sulphide gas within the sediment column indicates that an intense decay of organic matter under reducing conditions is taking place. Sedimentation rates are estimated to be ca. 50 cm/1000 years at the upper slope of the western Laptev Sea, being approximately 10 times higher than at the continental rise. The suboxic to anoxic environment diminishes at deep sea sites of the western Laptev Sea, where sedimentation rates and influx of organic matter are reduced.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1751-8369.1995.tb00709.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Structural changes of human epidermis induced by human leukocyte-derived proteases (1999)
    Oxford, UK : Blackwell Publishing Ltd
    Experimental dermatology 8 (1999), S. 0 
    Details
    ISSN: 1600-0625
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract: During the process of inflammation human neutrophils release potent serine proteases, such as human leukocyte elastase and cathepsin G. In psoriasis these enzymes are relased within the epidermis. To investigate the destructive potential of neutrophil-derived serine proteases these were applied on viable human epidermis as well as full thickness human skin in vitro. Human leukocyte elastase and cathepsin G were found to dissociate keratinocytes from epidermal sheets in a time- and dose-dependent fashion. Significant keratinocyte dissociation was observed 4 h after application of 3 nM human leukocyte elastase. By electron microscopy of elastase-or cathepsin G-treated full thickness human skin, widening of the extracellular space followed by complete separation of keratinocytes without intradesmosomal cleavage was observed. In addition, cathepsin G induced membrane damage as well as destruction of intracellular organelles. Thus, neutrophil-derived serine proteases exert pronounced destructive potential in human epidermis in concentrations likely to appear in lesional psoriatic skin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0625.1999.tb00347.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Pollen analysis reveals murder season (1998)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 395 (1998), S. 449-450 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Pollen analysis is well established in palaeogeographical research,, but it remains an underused resource in forensic science,. So far it has been used to investigate only one reported case of murder, but has not to our knowledge been used to determine the time of death. We examined a common ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/26646
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Stable phytoplankton community structure in the Arabian Sea over the past 200,000 years (1998)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 394 (1998), S. 563-566 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Glacial to interglacial climate changes have been related to organic carbon cycling in oceanic surface waters, and this possible link has led to the development of sedimentary tracers of past marine biological production. For example, sediment records of organic carbon, opal and biogenic barium ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/29047
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    13C isotope depletion in ikaite crystals: evidence for methane release from the Siberian shelves ? (1997)
    Springer
    Geo-marine letters 17 (1997), S. 169-174 
    Details
    ISSN: 1432-1157
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract  Ikaite crystals (CaCO3×6H2O) have been found at 232- to 238-cm sediment depth in R/V Polarstern core PS2460-4 from the Laptev Sea continental margin in a water depth of 204 m. δ13C values of this phase average −36.3±0.4‰ PDB (N=2), which is significantly outside the range of normal marine carbonates. The CO2 involved in the precipitation of the ikaite is most probably derived from methane, which has extremely depleted 13C isotope values. Two possible sources of methane in these sediments are: (1) methanogenesis (decomposition of organic matter under anaerobic conditions); and (2) gas hydrates, which are known to occur in the Siberian shelf regions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003670050023
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    Paper (German National Licenses)
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