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  • 1
    Electronic Resource
    Electronic Resource
    Metabolic adaptation of Zostera marina (eelgrass) to diurnal periods of root anoxia (1984)
    Springer
    Marine biology 83 (1984), S. 141-147 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The temperate seagrass Zostera marina L. is common in coastal marine habitats characterized by the presence of reducing sediments. The roots of this seagrass grow in these anoxic sediments, yet eelgrass is highly productive. Through photosynthesis-dependent oxygen transport from leaves to roots, aerobic respiration is supported in eelgrass roots only during daylight; consequently, roots are subjected to diurnal periods of anoxia. Under anoxic root conditions, the amino acids alanine and γ-amino butyric acid accumulate within a few hours to account for 70% of the total amino acid pool, while glutamate and glutamine decline. Little ethanol is produced, and the pool size of the organic acid malate changes little or declines slowly. Upon the resumption of shoot photosynthesis and oxygen transport to the roots, the accumulated γ-amino butyric acid declines rapidly, glutamate and glutamine pools increase, and alanine declines over a 16-h period. These adaptive metabolic responses by eelgrass to diurnal root anoxia must contribute to the successful exploitation of shallow-water marine sediments that have excluded nearly all vascular plant groups. A metabolic scheme is presented that accounts for the observed changes in organic and amino acid pool sizes in response to anoxia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00394721
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The Use of Memory (1983)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of philosophy of education 17 (1983), S. 0 
    Details
    ISSN: 1467-9752
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Education , Philosophy
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1467-9752.1983.tb00018.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Application of capillary supercritical fluid chromatography to the analysis of a middle distillate fuel (1984)
    Springer
    Chromatographia 18 (1984), S. 542-545 
    Details
    ISSN: 1612-1112
    Keywords: Supercritical fluid chromatography ; Alumina ; Fused silica capillary columns ; Middle distillate fuel
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The application of capillary supercritical fluid chromatography (SFC) to the analysis of a middle distillate fuel is described. Small diameter (50μm i.d.) fused-silica capillary columns coated with crosslinked 50% phenyl polymethylphenyl siloxane provided high separation efficiency and good compatibility with flame ionization detection. High resolution separations of the chemical class fractions obtained by adsorption chromatography on alumina were obtained using carbon dioxide as the supercritical mobile phase and simple pressure programming techniques. In addition to the less polar fuel components, supercritical carbon dioxide allowed chromatography of the nitrogen-containing polycyclic aromatic hydrocarbon fraction and the hydroxylated polycyclic aromatic materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02265691
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    Paper (German National Licenses)
    Fulltext
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