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  • 1970-1974  (10)
Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Marine biology 12 (1972), S. 295-299 
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A study of the direct uptake by Artemia salina of phosphate ion from the medium and its incorporation into acid-soluble organic phosphorous compounds over a range of exposure time from 2 to 30 min, using 32PO4 ion, indicated that the phosphate ion was directly taken up and was rapidly incorporated into the energy-rich compounds, such as adenosine triphosphate (ATP), guanosine triphosphate (GTP), and adenosine diphosphate (ADP), which were separated by ion-exchange chromatography using Dowex-1, X2. Even after an exposure of 2 min, the sum of the radioactivity of nucleotide-fractions was 37.4% of that of the whole acid-soluble extract. The most rapid incorporation of 32P occurred into ATP, followed by GTP and ADP. The amount of 32P incorporated into each fraction increased with increased exposure, giving straight lines when the radioactivity of each fraction was plotted against the exposure time on a logarithmic scale. Almost no difference, however, was observed in the distribution rate of 32P into each fraction at 2, 5, 10 and 30 min. These results show that inorganic phosphate absorbed by A. salina is rapidly incorporated into the energy-rich nucleotides, and that a dynamic equilibrium is established among various acid-soluble phosphorous compounds even after very short periods of time.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neurochemistry 23 (1974), S. 0 
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: —Complete cerebral ischemia was produced in normothermic anaesthetized cats by clamping the innominate and the left subclavian arteries combined with lowering the blood pressure. After 1 h of ischemia, ATP was no longer present in detectable amounts. Total adenine nucleotides were reduced to 34 per cent of the normal level. The breakdown of guanine nucleotides was less marked, with small amounts of GTP still being present at the end of the ischemic period. In animals with signs of functional recovery after 3–7 h of recirculation, ATP was resynthesized to 62 per cent of the control level. Total adenine nucleotides increased to 68 per cent and the adenylate energy change—[ATP + 1/2 ADP]/[AMP + ADP + ATP]—was re-established to within 7 per cent of the pre-ischemic value. Radiochromatography of nucleotides following intravenous injection of [14C]formate indicated a marked enhancement of postischemic purine de novo synthesis. Purine nucleosides and free bases which accumulated during ischemia, were partially re-utilized by salvage pathways: adenosine was rephosphorylated to AMP by adenosine kinase (EC 2.7.1.20); inosine and hypoxanthine were re-used via IMP in a reaction mediated by hypoxanthine phosphoribosyltransferase (EC 2.4.2.8).
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Archives of virology 34 (1971), S. 202-208 
    ISSN: 1432-8798
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The serological relationship between 8 strains of equine infectious anemia (EIA) virus was investigated by means of complement fixation and neutralization tests. All strains had a common complement fixing antigen, although there were some differences in the intensity of CF reaction in certain antigen-antiserum combinations. Cross neutralization tests revealed that all strains were only neutralized by homologous antisera. The respective antibody titers recorded ranged from 32 to 512. When horses were infected with the virus strains, neutralizing antibodies could be detected as early as 32 to 87 days after inoculation and maximum titers were demonstrable after 42 to 148 days. Of 34 horses infected with 6 strains of EIA virus, 33 horses had neutralizing antibody when they were tested 52 to 127 days after inoculation. Antibodies were only produced against the virus strains inoculated, and not against heterologous strains.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Archives of virology 41 (1973), S. 1-10 
    ISSN: 1432-8798
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Horses experimentally infected with a cloned virus of equine infectious anemia (EIA) exhibited a chronical disease with periodical relapses of fever and simultaneously increased viremia. Virus isolates taken at successive febrile attacks proved to be changed in their antigenic specificity. These virus variants could be differentiated from one another by neutralizing, but not complement-fixing or precipitating antibodies, suggesting a modification of surface antigens only. No alteration of infectivity among these variants could be demonstrated. The supposition is made that the persistence of virus in the blood of infected horses might be maintained by a consecutive development of antigenically distinct virus populations not susceptible to neutralizing antibodies previously produced, and that the appearance and increase of such variants in the blood might be responsible for febrile relapses.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 252 (1974), S. 191-191 
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 252 (1974), S. 342-342 
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Documenta ophthalmologica 30 (1971), S. 313-315 
    ISSN: 1573-2622
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Journal of thermal analysis and calorimetry 6 (1974), S. 305-320 
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Résumé Etude par ADT, TG, RX et IR de la décomposition catalytique de KClO4 par Fe2O3 obtenu par calcination de sels de Fe(II) à différentes températures. En l'absence de catalyseur l'échantillon commence par fondre tout en se décomposant et il se forme intermédiairement KClO3. En présence de catalyseur, la décomposition de la phase solide précède la fusion de KClO4 et il n'apparaît pue de faibles quantités de KClO3. Les différences de l'effet catalytique observées avec divers catalyseurs sont moins marquées dans la phase fondue que dans la solide. La température de décomposition initiale (Ti) augmente avec la température de préparation du catalyseur et est fixée par la granulométrie du catalyseur. Les variations deT i sont discutées sur la base des propriétés de semi-conducteur typen, du catalyseur.
    Abstract: Zusammenfassung Die katalytische Zersetzung von KClO4 durch Fe2O3, welches durch Kalzinierung von Fe(II)-Salzen bei verschiedenen Temperaturen erhalten wurde, wurde an Hand von DTA, TG, Röntgen und IR geprüft. Es wurde festgestellt, daß die Probe ohne Katalysator gleichzeitig zu schmelzen und sich zu zersetzen beginnt und ein Zwischenprodukt, KClO3, bildet. Die Zugabe von Katalysatoren ergab eine Zersetzung in der festen Phase, noch vor dem Schmelzen des KClO4 und in kleinen Mengen des KClO3. Der Unterschied der katalytischen Wirkung verschiedener Katalysatoren war bei der Schmelzphasenzersetzung geringer als in der festen Phase. Die Anfangs-Zersetzungstemperatur (T i) nahm mit steigender Herstellungstemperatur des Katalysators zu und zeigte einen ausgeprägten Zusammenhang mit der Kristallgröße des Katalysators. Die Änderungen vonT i wurden unter Erwägung der Halbleitereigenschaften vom Typn des Katalysators erörtert.
    Notes: Abstract The catalytic decomposition of KClO4 by Fe2O3, obtained by calcination of Fe(II) salts at different temperatures, was investigated by DTA, TG, X-ray and IR. A sample without catalyst was found to begin fusion and decomposition simultaneously, and to form an intermediate, KClO3. Addition of catalysts resulted in solid-phase decomposition before fusion of KClO4, and in a small amount of KClO3. The difference in catalytic effect observed for different catalysts was less in the molten-phase decomposition than in the solid phase. The initial decomposition temperature (T i) increased with the temperature of preparation of the catalyst and showed a definitive relationship with the crystallite size of the catalyst. The change ofT i is discussed on the basis of then-type semiconductive properties of the catalyst.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Journal of oceanography 27 (1971), S. 301-311 
    ISSN: 1573-868X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Type of Medium: Electronic Resource
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