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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 84 (1962), S. 2919-2922 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 72 (1950), S. 4454-4457 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Biochemistry 32 (1963), S. 83-154 
    ISSN: 0066-4154
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Chemistry and Pharmacology , Biology
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 167 (1951), S. 779-779 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Positive results were obtained with indium. Using Geiger counters with easily changeable cathodes, a definite increase in counting-rate above the background-rate was detected when indium cathodes were used. The increase was of the order of 15 pulses per minute from a cathode of effective area 75 ...
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  • 5
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 197 (1963), S. 253-255 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] ANTIBODIES in man and many animals are associated JL\. with a complex group of proteins known collectively as y-globulin. This fraction was originally defined as the component which moves most slowly during electro-phoresis of serum at alkaline pL. Serum proteins with the electrophoretic mobility ...
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  • 6
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 192 (1961), S. 733-737 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] MALARIAL infection is followed by the development of immunity which is specific for the homologous parasite, but ineffective against hetero-logous strains and species1-4. The epidemiological effects of acquired immunity in man are seen among the inhabitants of hyperendemic malarious regions who ...
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 20 (1964), S. 146-148 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The biological effect has been investigated of a specific protein with a growth-stimulating activity on epidermal cells. Injection of minute amounts of this factor (EGF) into newborn rats produces hyperplasia of the epidermis with a marked increase in the protein and nucleic acid content per unit of skin area. The activity of a number of epidermal enzymes per unit area is also increased by the epidermal growth factor.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Entomologia experimentalis et applicata 7 (1964), S. 155-166 
    ISSN: 1570-7458
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Die Gelbkräuselkrankheit der Tomaten wird durch ein bisher unbeschriebenes Virus hervorgerufen, das Tomaten- und Datura stramonium-Pflanzen in Israel befällt. Das Virus, das durch die Tabakmottenschildlaus übertragen wird, ist in seinem Überträger beständig, aber nicht für Lebenszeit. Ein Aufenhalt des Überträgers auf der infizierten Pflanze während 24 Stunden macht die Mottenschildlaus für eine Durchschnittszeit von 10–12 Tagen verimpfungsfähig. Während dieser Periode ist der Überträger ausserstande, seine stetig abnehmende Verimpfungsfähigkeit durch Zurückgewinnung des Virus von einer pflanzlichen Infektionsquelle zu ersetzen, bis er gänzlich aufhört, das Virus zu übertragen. Nur nach einem solchen Aufhören ist der Überträger imstande, das Virus erneut aufzunehmen und damit sein Verimpfungspotential wiederzugewinnen wie während des vorhergehenden Zyklus Aufnahme/Verimpfung. Im Sommer, wenn die Vitalität dieser Mottenschildlaus am höchsten ist, konnten drei solcher Zyklen wahrgenommen werden, dagegen nur ein Zyklus im Winter oder zwei im Frühling. Weibchen wurden sechsmal leistungsfähiger als Männchen in der Übertragung dieses Virus befunden.
    Notes: Abstract The tomato yellow leaf curl disease is caused by a hitherto undescribed virus (TYLCV), which attacks tomato and Datura stramonium plants in Israel. The virus, transmitted by the tobacco whitefly, is persistent in its vector, but not for life. A virus-acquisition access lasting 24 hours renders the whitefly inoculative for an average period of 10–12 days. During that period the vector is unable to compensate for its steadily decreasing inoculativity by re-acquiring the virus from a source plant, until it first completely ceases to transmit the virus. Only after such a cessation is the vector able to begin re-acquiring the virus, and thereby regain its inoculative potential as during the previous cycle of acquisition/inoculation.
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  • 9
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 170 (1952), S. 1072-1073 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The nucleic acid bases liberated by hydrolysis of whole viruses or virus deoxyribonucleic acid were separated on paper chromatograms using isopro-panol - water - hydrochloric acid5 as the solvent. When formic acid (88 per cent at 175 C. for 30 min.) was used for hydrolysis, a substance was ...
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  • 10
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 170 (1952), S. 846-847 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We have recently analysed the deoxyribonucleic acid of another rickettsia from the same host. Deoxyribonucleic acid was isolated2 from epidemic typhus rickettsise (R. prowazeki) grown in chick yolk-sac endothelium, and the purine and pyrimidine bases estimated3 after hydrolysis in perchloric acid ...
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