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  • *Radioactive Fallout  (1)
  • Analytical Chemistry and Spectroscopy  (1)
  • Biochemistry and Biotechnology
  • 1985-1989  (2)
  • 1987  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Study of the monomer-dimer equilibrium of nitrosobenzene using multinuclear one- and two-dimensional NMR techniques (1987)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 25 (1987), S. 1007-1011 
    Details
    ISSN: 0749-1581
    Keywords: 13C ; 15N ; 17O NMR 13C ; 2D-EXSY ; nitrosobenzene ; activation energies ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The monomer-dimer equilibrium of nitrosobenzene in CDCI3 solution was studied in the temperature range -50 to 30 °C using 13C, 15N and 17O NMR spectroscopy. Decreasing temperature favours the dimeric azodioxy species, and below ca 10 °C both cis and trans dimers were detected in addition to the monomer. The relative abundance of the trans dimer is low (≤6%) at all temperatures and this is the first report of its existence in solution. The monomer and dimer species were characterized by their 13C and 15N shifts, and exchange between them was measured quantitatively by 13C 2D-EXSY spectra. Exchange occurred exclusively between the cis-dimer and monomer and between the trans-dimer and monomer, activation energies, ΔG≠(298.15 K) being 65.8±0.1 and 70.0±0.3 kJ mol-1, respectively.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260251118
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    Paper (German National Licenses)
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  • 2
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    Radioactive cesium from the Chernobyl accident in the Greenland Ice Sheet (1987)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1987-08-07
    Description: Measurements of cesium-134 and cesium-137 in Greenland snow together with models of long-range transport have been used to assess radionuclide deposition in the Arctic after the Chernobyl accident. The results suggest that a well-defined layer of radioactive cesium is now present in polar glaciers, providing a new reference for estimating snow accumulation rates and dating ice core samples.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Davidson, C I -- Harrington, J R -- Stephenson, M J -- Monaghan, M C -- Pudykiewicz, J -- Schell, W R -- New York, N.Y. -- Science. 1987 Aug 7;237(4815):633-4.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3603043" target="_blank"〉PubMed〈/a〉
    Keywords: *Accidents ; *Cesium Radioisotopes ; Greenland ; Models, Theoretical ; *Nuclear Reactors ; *Radioactive Fallout ; Snow ; Ukraine
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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