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  • 1
    ISSN: 1432-8798
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Cultures from pig bone marrow cells were infected with ASFV and the replication cycle was studied. In the cytoplasmic replication areas there are a differentiation of membrane segments. Some of them are polygonal, which give rise to virus particles. An over production of viral coded materials, including non-polygonal membranes seems to be an important feature of the replicative cycle of ASFV in this cell system. Viruses are released enveloped with a cellular membrane. Paracrystalline arrays of viruses are seldom seen in the cytoplasm. At no time did we see viruses in the nucleus. Infected cells showed marked cytopathic effect, beginning at early times post infection.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Archives of virology 45 (1974), S. 272-277 
    ISSN: 1432-8798
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Cross-reaction in hemadsorption inhibition tests with African swine fever viruses and swine immune sera permitted the separation of two antigenic subgroups, A and B. However, there are African swine fever viruses which cannot be included in these subgroups, thus constituting at least one third subgroup. Non-hemadsorbing African swine fever viruses are described which were isolated from pigs dying with chronical lesions of pneumonia as shown by autopsy; several hypotheses to explain the appearance of these nonhemadsorbing strains are advanced. Electron microscopy studies suggest that the subgroup-specific antigen is associated with the outer structural component of the virion, which derives from the cytoplasmic membrane of the infected cell.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-1335
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Wachsende Kulturen von Embryonalzellen des Schafes wurden mit Quinacrin, einem die Lysosomen markierenden Farbstoff, in verschiedener Konzentration (10−5, 10−6 und 10−7 g/ml des Kulturmediums) für 24 Std. inkubiert. Die durchschnittliche Zahl der Mitosen und der 24stündlich mit Thymidin markierten Zellen entsprechen einer Exponentialfunktion der anfänglichen Farbstoffkonzentration im Kulturmedium. Die Variationen der S-Phase (gemessen an autoradiographischen Impulsen in einer Stunde) legt das Vorhandensein zweier verschiedener Zeiten für Zellpopulationen bei 10−6 und 10−7 g/ml nahe. Der Vergleich des Prozentsatzes der Zellen mit sauerer Phosphatase mit dem Mitoseindex spricht für ein gegensätzliches Verhalten beider Parameter. Vielkernigkeit war bei den Zellen von den 10−5 g/ml-Präparaten sechsmal häufiger als in den Kontrollen. In den Präparaten zeigten 3,2% der Zellen Kern-Cytoplasma-Brücken ohne Thymidinmarkierung. Die intravital gefärbten Lysosomen enthielten sauere Phosphatase, eine PAS-positive Substanz, Ribonucleoprotein und einen blau fluorescierenden Stoff, der resistent war gegen Nucleaseverdauung.
    Notes: Summary Cultures of sheep embryonic cells, when actively growing, were incubated with quinacrine (a lysosome tagg) at concentrations of 10−7, 10−6, 10−5 g/ml of culture medium, for 24 hours. The mean number of mitosis and 24 hour thymidine labelled cells are an exponential function of the initial dye concentration on the culture medium. The variation of S compartment (on one hour pulse autoradiographs) suggests two different transit times of cell population at 10−6 and 10−7 g/ml. The distribution obtained by plotting the percentages of cells with acid phosphatase against mitotic index points to an inverse correlation between these two parameters. Multinucleation in cells obtained from 10−5 g/ml preparations was six times more frequent as compared to the controls. In such preparations 3.2% of the cells showed nucleus-cytoplasmatic bridging with no thymidine label. The intravital stained bodies (the lysosomes) contain acid phosphatase, a PAS positive substance, ribonucleoprotein and a blue fluorescent material resisting nuclease digestion.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-8798
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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