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  • 1
    ISSN: 1432-0738
    Keywords: Insecticides ; Organophosphates ; Carbamic Esters ; Detection ; Biological Material ; Insecticide ; organische Phosphorverbindungen ; Carbaminsäureester ; Nachweis ; Biologisches Material
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Es wird ein kombiniertes dünnschichtchromatographischenzymatisches Verfahren beschrieben, das es ermöglicht, insecticidwirksame Esterasehemmer in allen biologischen Materialien nebeneinander zu identifizieren und semiquantitativ zu bestimmen. Die Identifizierung wird an Hand der Rf-Werte in verschiedenen mobilen Phasen, dem Auftreten von esterasehemmenden Folgeprodukten sowie aus dem Verhalten gegenüber verschiedenen Aktivierungsverfahren vorgenommen. Mit Hilfe der beschriebenen Aktivierungsverfahren lassen sich auch die nichthemmenden Thionophosphorsäureester sowie die Phosphonsäureester „Trichlorphon“ und „Tribuphon“ mit hoher Empfindlichkeit nachweisen. Das Verfahren ist außer für Phosphorsäureester auch für den Nachweis esterasehemmender Carbaminsäureester anwendbar.
    Notes: Summary A combined TLC-enzymatic method is described which makes possible the simultaneous identification and semi-quantitative determination of cholinesterase-inhibiting insecticides in all types of biological material. Identification is carried out by means of determining thin-layer chromatography Rf-values using different mobile phases, by the appearance of esterase-inhibiting metabolites, as well as by observing reactions in various activation procedures. Utilizing the described activation procedures, non-inhibiting phosphorothionates as well as the phosphonic acid esters Trichlorphon and Butonate are also detectable with a high degree of sensitivity. The combined method enables also the determination of esterase-inhibiting carbamic esters.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1434-6079
    Keywords: 61.80 ; 78.40 ; 71.35
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The influence of X-ray irradiation on the optical absorption of K-atoms in Ar-matrices was studied as a function of time and temperature. Exponential decrease of the so-called red and blue triplet absorptions was observed. Simultaneously a new absorption in the range of the red triplet was built up. The new absorption could alternatively be produced by light irradiation into the red or the blue triplet, as was shown in a second experiment studying correlated optical and ESR-absorption. After annealing at 15 K the new absorption disappeared, and the original absorptions were largely restored. All experimental results can well be understood in terms of exciton production, self-trapping, and deexcitation, and are described by a master equation system.
    Type of Medium: Electronic Resource
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