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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 56 (1978), S. 521-524 
    ISSN: 1432-1440
    Keywords: Hepatitis B Antigen ; Enzyme-Immunoassay ; Radioimmunoassay ; Blood Donors ; Hepatitis BsAntigen ; Enzym-Immunoassay ; Radioimmunoassay ; Blutspender
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung In einer Vergleichsuntersuchung wurden die Seren von 12080 unbezahlten Blutspendern mit dem Enzym-Immunoassay (EIA) und dem Radioimmunoassay (RIA) auf HBs-Antigen untersucht. Im EIA-Screeningtest wurde ein relativ hoher Prozentsatz nicht reproduzierbarer positiver Reaktionen festgestellt, der im wesentlichen durch ungenügendes Waschen bedingt ist. Wurde der EIA mit einer automatischen Waschapparatur durchgeführt, so konnte dieser Prozentsatz deutlich gesenkt werden. Nach Neutralisation wurden 0,31% positive Proben im EIA und im RIA festgestellt. Daraus kann geschlossen werden, daß praktisch keine Unterschiede in der Empfindlichkeit zwischen diesen beiden Tests bestehen. Der EIA benötigt eine längere Inkubationszeit als der RIA. Der EIA hat jedoch den Vorteil, daß er nicht mit radioaktiven Substanzen arbeitet, keine kostspielige Ausrüstung erfordert und daß die Resultate sofort ablesbar sind. Der EIA ist ohne Schwierigkeiten durchzuführen, zwei med.-techn. Assistentinnen können etwa 1000 Seren pro Tag untersuchen.
    Notes: Summary In a comparative study 12,080 sera from unpaid donors were tested simultaneously for Hepatitis B Antigen (HBsAg) by enzyme-immunoassay (EIA) and radioimmunoassay (RIA). A relatively high number of sera reacted positive in the EIA-screening test but were negative after repeated investigation. This percentage could be markedly reduced when using an automated washing apparatus. After neutralization 0.31 per cent were considered as true positive in EIA and RIA, thus demonstrating that no differences did exist as far as sensitivity is concerned. The EIA needs more incubation time than the RIA, however, the EIA has the advantage of using enzyme-labelled antibodies instead of radio-iodinated reagents. The results are read immediately and no sophisticated equipment is required. The EIA is easy to handle, two technicians can perform 1000 tests per day.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Extracts of the taste hair rich tarsi of the pro- and mesothoracic legs of the flyProtophormia terraenovae contain five chromatographically separable α-glucosidases (E.C. 3.2.1.20). These glucosidases were characterized according to their substrate specificities, their Michaelis constants and their pH optima. The enzymes GLU I, III and V show a broad specificity for several α-glucosides (sucrose, maltose, turanose, palatinose, melezitose and p-nitrophenyl-α-glucoside). The GLU II and IV split sucrose especially with extraordinarily high Michaelis constants (0.1–0.2 M). The properties of the fly enzymes were compared with those of other origine (intestine of mammals, yeast), but especially with those of the fly's taste hair rich labella (Morita and coworkers, 1972–1974). The enzyme GLU III exhibits properties indicating that it may be the sugar receptor protein in question.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Archiv der Mathematik 28 (1977), S. 238-252 
    ISSN: 1420-8938
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular histology 8 (1976), S. 341-350 
    ISSN: 1573-6865
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Synopsis Intracellular diffusion properties and enzyme activities in single living cells can be analysed by means of fluorogenic substrates that diffuse into the cells where they are converted into a fluorescent product by an enzymic reaction. The reaction-kinetic analysis of this process as a system of consecutive reactions provides information on the diffusion of the substrate into the cells, on intracellular enzyme activities and on the efflux of the fluorescent product. Separation of diffusion and enzyme-mediated processes is obtained by inducing specific changes of the cellular membrane using gramicidin D. A model for the functional interpretation of the experimental findings is proposed. Application of this method as a viability test for freshly prepared and frozen platelets is discussed.
    Type of Medium: Electronic Resource
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