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  • 1975-1979  (6)
  • 1970-1974
  • 1977  (6)
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Material
Years
  • 1975-1979  (6)
  • 1970-1974
Year
  • 1
    Electronic Resource
    Electronic Resource
    THE ROBUSTNESS OF CROSS-CULTURAL FINDINGS (1977)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 285 (1977), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1977.tb29349.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Temperature dependence of the extinction coefficient of mercuric iodide vapor. Heat of sublimation and vapor pressure of solid mercury(II) iodide (1977)
    s.l. : American Chemical Society
    Inorganic chemistry 16 (1977), S. 2270-2272 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic50175a024
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    Paper (German National Licenses)
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  • 3
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    Unknown
    Quantitative analyses of biographies of political figures (1977)
    Provincetown, Mass., etc. : Periodicals Archive Online (PAO)
    Journal of Psychology. 97:2 (1977:Nov.) 281 
    Details
    ISSN: 0022-3980
    Topics: Psychology
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:1140-1977-097-02-000018
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Lead and PCB's in canvasback ducks: Relationship between enzyme levels and residues in blood (1977)
    Springer
    Archives of environmental contamination and toxicology 5 (1977), S. 1-13 
    Details
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract Blood samples were taken for two successive years from canvasback ducks trapped in the Chesapeake Bay. The first winter (1972–1973) five plasma enzymes known to respond to organochlorine poisoning were examined. Abnormal enzyme elevations suggested that 20% of the population sampled (23/115 ducks) might contain organochlorine contaminants, but no residue analyses were performed. The second winter (1974) two of the same enzymes, aspartate aminotransferase and lactate dehydrogenase, and a third enzyme known to be specifically inhibited by lead, delta-aminolevulinic acid dehydratase, were assayed in 95 blood samples. Blood residues of organochlorine compounds and of lead were determined in representative samples, and the correlations between residue levels and enzyme changes were examined. The enzyme bioassays in 1974 indicated that lead was a more prevalent environmental contaminant than organochlorine compounds in canvasback ducks; 17% of the blood samples had less than one-half of the normal delta-aminolevulinic acid dehydratase activity, but only 11% exhibited abnormal aspartate aminotransferase or lactate dehydrogenase activities. These findings were confirmed by residue analyses that demonstrated lead concentrations four times higher than background levels, but only relatively low organochlorine concentrations. There was a highly significant inverse correlation between delta-aminolevulinic acid dehydratase activity and blood lead concentrations (P〈0.01), and a weaker but significant correlation between plasma aspartate aminotransferase activity and blood PCB concentrations (P〈0.05). It was apparent that delta-aminolevulinic acid dehydratase activity in the blood provided a sensitive and precise estimate of lead contamination in waterfowl. In canvasback ducks 200 ppb of lead in the blood caused a 75% decrease in delta-aminolevulinic acid dehydratase activity, a magnitude of enzyme inhibition that disturbs heme synthesis and is regarded as detrimental in humans.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02220886
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  • 5
    Electronic Resource
    Electronic Resource
    The mechanism of cobalamin-dependent rearrangements (1977)
    Springer
    Molecular and cellular biochemistry 15 (1977), S. 89-108 
    Details
    ISSN: 1573-4919
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Summary Adenosylcobalamin-dependent rearrangements are enzyme catalyzed reactions in which a hydrogen atom is transferred from one carbon atom to an adjacent one in exchange for a group X which migrates in the opposite direction. In the hydrogen transfer step, the mechanism of which is reasonably well understood, the cofactor serves as an intermediate hydrogen carrier. The transfer of hydrogen to the cofactor involves homolysis of the carbon-cobalt bond to generate cob(II)alamin and the 5′-deoxyadenos-5′-yl radical, followed by abstraction of a hydrogen atom from the substrate to form 5′-deoxyadenosine and the substrate radical. After migration of group X, the hydrogen atom is returned to the product radical by the reverse of the above reactions to generate the final product and reconstitute the cofactor. In contrast to the transfer of hydrogen, the mechanism of group X migration is poorly understood. Many reactions mechanisms have been proposed on chemical grounds, but there is insufficient biochemical evidence to permit a choice among these proposals. A quantity of negative evidence has accumulated suggesting that group X migration does not involve alkylation of the cobalt of cobalamin by the substrate, but in the absence of firm data supporting an alternative mechanism, even this weak conclusion must be regarded as provisional.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01793331
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  • 6
    Electronic Resource
    Electronic Resource
    Chaleurs differentielles d'adsorption de l'anhydride carbonique sur differents tamis moleculaires (1977)
    Springer
    Journal of thermal analysis and calorimetry 11 (1977), S. 51-60 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Résumé Les chaleurs différentielles d'adsorption de l'anhydride carbonique par la mordénite sodique et différents tamis moléculaires (NaX, NaY, HZ, Na0.25Ca0.375A) ont été mesurées par calorimétrie. Pour la mordénite sodique, l'étude a porté sur un large domaine de température et de pression: −77〈T〈+120
    Abstract: Zusammenfassung Die Differential-Adsorptionswärmen von CO2 an Natrium-mordenit und verschiedenen Molekularsieben (NaX, NaY, HZ, Na0.25 Ca0.375 A) wurden kalorimetrisch bestimmt. Das erste Zeolith wurde in einem weiten Temperatur- und Druckbereich pntersucht (−77
    Notes: Abstract Differential heats of adsorption of CO2 by sodic mordenite and several molecular sieves (NaX, NaY, HZ, Na0.25 Ca0.375A) are measured calorimetrically. For the first zeolite, a wide range of temperature and pressure is studied: −77
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02104083
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