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  • 1965-1969  (8)
  • Polymer and Materials Science  (4)
  • Organic Chemistry  (3)
  • Herzzeitvolumen  (1)
  • Nuclear reaction
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  • 1
    ISSN: 1432-0738
    Keywords: Atropine ; Cardiac output ; Cholinesterase inhibitors ; Pralidoxime compounds ; Respiration ; Peripheral vascular resistance ; Atmung ; Atropin ; Cholinesterase-Gifte ; Herzzeitvolumen ; Peripherer Gefäßwiderstand ; Pralidoxim-Verbindungen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung An 53 Katzen in Chloralose-Urethan-Narkose wurde durch intravenöse Infusion von 1,2 mg/kg Paraoxon (0,02 mg/kg×min) eine Organophosphatvergiftung ausgelöst. Während der Vergiftung und nach erfolgreicher Behandlung mit esterasereaktivierenden Oximen (Pralidoxim, Obidoxim) und Atropin wurden Blutdruck, Herzzeitvolumen, periphere Durchblutung sowie pH, pCO2 und pO2 im arteriellen Blut über einen Zeitraum von 7 Std verfolgt. Dabei ergab sich: 1. Während der Vergiftung bildete sich eine Blutdrucksenkung und Herzzeit-volumenabnahme aus, die durch Methylatropin, das nur die peripheren muscarinartigen Vergiftungserscheinungen zu antagonisieren vermag, auch bei künstlicher Atmung nicht beseitigt werden konnte. 2. Nach intravenöser Zufuhr von Pralidoxim (30,0 mg/kg) oder Obidoxim (15,0 mg/kg) i. v. verschwanden innerhalb weniger Minuten alle peripheren Vergiftungssymptome. 3. Bei allen behandelten Tieren bildete sich innerhalb von 30–60 min eine anhaltende Erhöhung des peripheren Gefäßwiderstandes aus, der auch durch hohe Dosen von Atropin (bis 5,0 mg/kg) nicht zu beseitigen war. 4. Nach alleiniger Behandlung der Paraoxonvergiftung mit Pralidoxim kam es zu einer zentralen Atmungsstimulation, die zur respiratorischen Alkalose führte. Diese Auswirkung der Hirn-AChE-Vergiftung konnte durch Atropin beseitigt werden. Nach Behandlung der Paraoxonvergiftung mit Obidoxim wurde eine derartige Atmungsstimulation nicht beobachtet. Aus den experimentellen Befunden ergeben sich einige Anhaltspunkte für mögliche Spätkomplikationen bei erfolgreicher Behandlung von Organophosphat-vergiftungen mit esterasereaktivierenden Oximen und Atropin.
    Notes: Summary Organophosphate poisoning was induced in 53 cats under urethanechloralose anesthesia by intravenous infusion of 1.2 mg/kg (0.02 mg/kg/min) paraoxone. Arterial blood pressure, cardiac output, peripheral blood flow, as well as arterial pH, pO2 and pCO2 were monitored over a period of seven hours during the intoxication and successful treatment with cholinesterase reactivating oximes (pralidoxime and obidoxime). The results are summarized as follows: 1. There was a fall in blood pressure and cardiac output with the progress of intoxication which was not alleviated by either methylatropine (capable of antagonizing only peripheral muscarine-like intoxication signs and symptoms) or by mechanical support of respiration. 2. The peripheral signs of intoxication disappeared within minutes upon intravenous injection of pralidoxime (30.0 mg/kg) or obidoxime (15.0 mg/kg). 3. There was a persistant elevation of peripheral vascular resistance in all animals treated which developed within 30–60 minutes and could not be influenced by high doses of atropine (up to 5.0 mg/kg). 4. Following the treatment of paraoxone poisoning with pralidoxime alone, there resulted a central respiratory stimulation which led to actual respiratory alkalosis. This effect of inhibition of the acetylcholine esterase in the brain could be abolished by atropine. When the paraoxone intoxication was treated with obidoxime alone, no comparable stimulation of respiration was observed. The results of these experiments point to some possible late complications by the successful treatment of organophosphate poisoning with cholinesterase reactivating oximes and atropine.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-2: Polymer Physics 7 (1969), S. 37-45 
    ISSN: 0449-2978
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The well known procedure of determining the degree of crystallinity by means of measuring the density presupposes the knowledge of both the densities ρc and ρa of the crystalline and of the noncrystalline regions. By combination of small-angle and wide-angle x-ray scattering and of density measurements it can be shown that this method is not justified in the case of drawn polyethylene if the values of ρc and ρa known from isotropic material are used. Both ρc and ρa depend considerably on annealing and drawing conditions. In addition the effective density ρc* of the more densely packed phase in a two-phase structure is much lower than the value ρc calculated from the positions of the x-ray reflections due to a large number of lattice defects. This conclusion is based on the results of three independent sets of experiments: determination of the mean-square fluctuation of density 〈η2〉 by means of x-ray small-angle scattering; x-ray wide-angle measurements of the positions of the crystal reflections and of the halo arising from the noncrystalline regions; and comparison of densities and long periods of samples treated at various annealing temperatures.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 11 (1967), S. 357-368 
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Previous studies by Black and Blomquist on the degradative failure of polymer-metal adhesive bonds have shown that composite failure depends largely on the type of metal substrate employed. In the work reported herein, metal powders of high surface area have been employed to maximize the metal-polymer interface. The composite systems studied consisted for aluminum and iron with polycondensates of bisphenol A-diglycidyl ether, phenol-formaldehyde and poly-2,2′-(m-phenylene)-5,5′-bibenimidazole. The composites were prepared in the absence of air and thermally degraded in a time-of-flight mass spectrometer while the degradation products were continuously monitored from mass 1 to 200. In the polymer and polymer-metal systems investigated, iron accelerated the decomposition of all polymers studied. This was determined by plotting m/e against degradation temperature for the more common mass peaks such as hydrogen and carbon monoxide for the carbon-hydrogen-oxygen-containing polymer and hydrogen cyanide and ammonia for the carbon-hydrogen-nitrogen-containing polymer. This technique offers promise in determining the nature of the interface as well as the effect of the interface on polymer degradation.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 48 (1965), S. 275-279 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In systematischer Abänderung der Sedridin-Molekel am heterocyclischen Ring, am Stickstoff, an der Hydroxylgruppe und an einer der Methylgruppen wurden 20 neue Derivate synthetisiert.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 50 (1967), S. 34-42 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Aus Männchen der Ameisenart Formica polyctena FOERST. wurden mit Hilfe chromatographischer Verfahren an Cellulosesäulen Lumazin, Lumazin-6-carbonsäure, Isoxantholumazin, 6-Methyl-8-ribityl-isoxantholumazin sowie zwei weitere, noch nicht identifizierte Isoxantholumazinderivate isoliert. Die ersten vier Lumazine wurden durch Vergleich mit authentischen synthetischen Produkten identifiziert.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 49 (1966), S. 1259-1265 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Aus Männchen von Formica polyctena FOERST. wurden mit Hilfe von Chromatographie an Cellulosesäulen eine neue Riboflavinverbindung, ein Riboflavinkomplex, ein als Formicaflavin bezeichnetes tiefgelb fluoreszierendes Isoalloxazinderivat und eine weitere unbekannte, gelbgrün fluoreszierende Substanz isoliert. Die Verbindungen werden durch ihre UV.-Spektren, Rf-Werte sowie elektrophoretischen Beweglichkeiten charakterisiert.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Letters 5 (1967), S. 619-624 
    ISSN: 0449-2986
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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