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  • 1975-1979  (10)
  • 1977  (6)
  • 1976  (4)
Material
Years
  • 1975-1979  (10)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 285 (1977), S. 0 
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Inorganic chemistry 16 (1977), S. 2270-2272 
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
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    Unknown
    Provincetown, Mass., etc. : Periodicals Archive Online (PAO)
    Journal of Psychology. 92:2 (1976:Mar.) 261 
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  • 4
    facet.materialart.
    Unknown
    Provincetown, Mass., etc. : Periodicals Archive Online (PAO)
    Journal of Psychology. 97:2 (1977:Nov.) 281 
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Contributions to mineralogy and petrology 54 (1976), S. 293-313 
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Four volcanoes form Terceira, one of the islands of the Azores group; three contain both basaltic and peralkaline and one only peralkaline rocks. A recently active basaltic fissure zone trends NW-SE across the island. The rocks fall into the alkaline olivine basalt suite although some young basalts are of transitional affinity. The geochemistry shows two general basaltic series: 1) undersaturated, found in lavas of the oldest volcano and in some recent fissure zone basalts and hawaiites; 2) saturated, found in the younger basaltic lavas. Since the emergence of Terceira there has been a contemporaneity of basalt and salic peralkaline lavas. The younger rocks show a bimodal composition distribution, the most voluminous compositions being alkali olivine basalt and comendite with negligible volume in the benmoreite-trachyte range. Two processes appear viable for the derivation of voluminous oversaturated peralkaline rocks: 1) partial melting of upper mantle material giving small magma batches of contrasting composition or 2) fractionation from a transitional basaltic parental magma.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Archives of dermatological research 255 (1976), S. 265-270 
    ISSN: 1432-069X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung In Homogenaten frischer menschlicher Haut wurden die Aktivitäten der Laktatdehydrogenase (LDH), der Glukose-6-phosphat-Dehydrogenase (G-6-PDH), der “sauren” Phosphatase (AcP) und der “Leucinaminopeptidase” (LAP) nach Inkubation mit Hydrocortison, Hydrocortison-acetat oder Hydrocortison-17-butyrat bestimmt. Die Konzentration des Steroids betrug in allen drei Fällen 2,75 mMol/l. Hydrocortison-butyrat bewirkte eine signifikante Hemmung der LDH-, G-6-PDH- und AcP-Aktivitäten. Hydrocortison und Hydrocortison-acetat zeigten nur bei der G-6-PDH-Aktivität eine signifikante Hemmwirkung. — An reiner G-6-PDH aus Hefe war die Hemmwirkung von Hydrocortison-butyrat signifikant stärker als die Hemmwirkung von Hydrocortison und Hydrocortison-acetat. Zeit-Wirkungs-Diagramme zeigten, daß Hydrocortison-butyrat vom Beginn der Inkubation an wirksam ist (keine Esterspaltung). — Die Ergebnisse unterstützen die Annahme, daß Hydrocortison-butyrat eigene biochemische-pharmakologische Effekte besitzt und daß es nicht nur als veresterte Transportform von Hydrocortison angesehen werden darf.
    Notes: Summary In fresh human skin homogenates, the activities of four enzymes, lactate dehydrogenase (LDH), glucose-6-phosphate dehydrogenase (G-6-PDH), “acid” phosphatase (AcP), and “leucine aminopeptidase” (LAP) were assayed following an incubation with hydrocortisone, hydrocortisone acetate, or hydrocortisone-17-butyrate, respectively. Concentration of the three compounds measured 2.75 mMol/l. Hydrocortison butyrate inhibited LDH-, G-6-PDH-, and AcP-activities. Hydrocortisone and hydrocortisone acetate exerted a significant inhibitory action only in the case of G-6-PDH-activity.—On pure G-6-PDH from yeast, the inhibition exerted by hydrocortisone butyrate was significantly stronger than the inhibition exerted by the two other steroids. Time/action diagrams revealed the fact that hydrocortisone butyrate is superior to the other two compounds from the beginning of the incubation period.—The data sustain the assumption that hydrocortisone butyrate exerts biochemical-pharmacological actions of its own and that it may not be considered just as an esterified transport form of hydrocortisone.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Archives of environmental contamination and toxicology 5 (1977), S. 1-13 
    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
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Molecular and cellular biochemistry 15 (1977), S. 89-108 
    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
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Journal of thermal analysis and calorimetry 11 (1977), S. 51-60 
    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
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  • 10
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 5 (1976), S. 175-177 
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The cheapness of modern minicomputers coupled with the need for rapid and accurate output of X-ray fluorescence analytical data makes the use of computers almost obligatory. The minicomputer has the advantages of immediate availability of results over other methods. In laboratories with an annual output of less than 10 000 determinations the on-line card -punch or magnetic-tape reader coupled through a terminal to a central computer is equally effective though slower.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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