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  • 1985-1989  (1)
  • 1965-1969  (1)
  • 1950-1954
  • 1880-1889  (1)
  • Chemistry  (2)
  • diatoms  (1)
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Material
Years
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Biogenic silica and phosphorus accumulation in sediments as indices of eutrophication in the Laurentian Great Lakes (1986)
    Springer
    Hydrobiologia 143 (1986), S. 79-86 
    Details
    ISSN: 1573-5117
    Keywords: paleolimnology ; diatoms ; nutrients ; phytoplankton production
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Biogenic silica (BSi), total phosphorus (TP), and biologically available phosphorus (AVP) were measured in short cores from Lake Michigan, Lake Erie, and Lake Ontario. Peaks in BSi concentration and peaks in BSi:TP or BSi:AVP ratios provided stratigraphic signals of water column silica (Si) depletion as a response of increased diatom production to P enrichment and decreased diatom production resulting from silica depletion. By contrast the stratigraphic record of P accumulation provided very weak signals of the historical nutrient enrichment in the water column. These results indicate that system P recycling has a higher rate constant than Si recycling and, as a consequence, that relatively small levels of P enrichment can increase diatom production and sedimentation eventually causing Si depletion and Si-limited diatom production in the water mass.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00026648
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Corrosion rate measurements in vivo (1967)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 1 (1967), S. 405-414 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: Corrosion resistance is particularly important in medical treatments requiring implantation of metallic objects in the human body. Unfortunately, weight loss measurements and other conventional corrosion testing techniques are insufficiently sensitive and difficult to adapt to in vivo environments. The linear polarization technique can be used to remotely meaure the corrosion rates of metals implanted in tissue using needle probes. The principles of this technique are reviewed and the results of tests performed on steel, cobalt, and molybdenum implanted in experimental animals are discussed.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820010405
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    I. Ueber Azimidoverbindungen (1889)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 255 (1889), S. 339-356 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.18892550307
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    Paper (German National Licenses)
    Fulltext
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