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  • 1
    Type of Medium: Book
    Pages: 17 S , graph. Darst
    Series Statement: Berichte / Geologisch-Paläontologisches Institut und Museum. Christian-Albrechts-Universität Kiel 38
    Language: Undetermined
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 111 (1978), S. 3904-3911 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Syntheses with Compounds R3M — Hg — MR3, XVI: (Silylamino) methyl Radicals and Their DimersSchiff bases ArRC = NR′ 1 and 8 react with (Me3Si)2Hg to give the radicals ArRĊ — NR′SiMe3 3 and 9, resp., smoothly and spontaneously upon heating or irradiation. The latter are in equilibrium with the corresponding dimers, the 1,2-diaminoethanes 4 and 10. The equilibria depend strongly on the steric strain in the dimers. Finally, with R = Me the disproportionation products 6 and 7 are isolated quantitatively. ESR data of 3 and 9 are given. They are influenced by the bulkiness of the substituents at the C and N atoms.
    Notes: Schiffsche Basen ArRC = NR′ 1 bzw. 8 bilden mit (Me3Si)2Hg beim Erwärmen oder Belichten spontan und glatt die Radikale ArRC· — NR′SiMe3 3 bzw. 9. Diese stehen im Gleichgewicht mit den entsprechenden Dimeren, den 1,2-Diaminoethanen 4 bzw. 10. Die Gleichgewichte sind stark abhängig vom sterischen Druck in den Dimeren. Mit R = Me isoliert man jedoch schließlich quantitativ die Produkte der Disproportionierung 6 und 7. ESR-Daten von 3 und 9 werden angegeben. Sie werden beeinflußt von der Raumerfüllung am C- und N-Atom.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Publication Date: 2019-09-23
    Description: Biogenic structures in Late Quaternary sediments from the southwestern Iberian continental slope were studied by using X-ray images from two cores from 580 and 1750 m water depth. Eight different ichnocoenoses were observed: indistinct bioturbation, Planolites-dominated, Thalassinoides-dominated, Chondrites-dominated, Planolites and Thalassinoides-dominated, pyritized microburrows such as Trichichnus and ‘Mycellia’-dominated, Chondrites, Trichichnus, and ‘Mycellia’-dominated and Zoophycos. Variations of the ichnocoenoses within the cores show a striking correlation with climatically induced changes in the hydrographical regime, i.e. current strength and bathymetric position of the Mediterranean Outflow Water (MOW). Comparison of the response of the ichnocoenoses to changes in bottom-water conditions and substrate between the two cores studied indicate that bottom-water oxygenation and enrichment of particulate organic matter at the base of the MOW layer are the primary factors controlling the ichnocoenoses. The traces even recorded short-term climatic changes such as the Younger Dryas cold event. The spatial and temporal distribution patterns are in good agreement with earlier models of the MOW history, which gives reason to see a refinement of trace fossils as a complementary tool for paleoceanographical studies.
    Type: Article , PeerReviewed
    Format: text
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