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  • 1965-1969  (5)
  • Elektrophysiologie  (3)
  • Chemical Engineering  (2)
  • 1
    ISSN: 1432-2013
    Keywords: Cerebral Cortex ; Cerebral Ischemia, Transient ; Electrophysiology ; Großhirnrinde ; Gehirnischämie ; Elektrophysiologie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die corticale Gleichspannung wurde an isolierten Hundeköpfen von der Konvexität des Gehirns (Gyrus lateralis) gegen Nase (Knochenoberfläche des os frontale) bei kompletter und inkompletter Gehirnischämie gemessen. Während kompletter Gehirnischämie verschiebt sich die Gleichspannung nach einer initialen Positivierung, die 1,5–2,75 min nach Ischämiebeginn ein Maximum von 1,5–2 mV erreicht, in negativer Richtung. Diese Negativierung erreicht 3–8 min nach Ischämiebeginn einen steady state von im Mittel 6,5 mV. Nach Ende der kompletten Gehirnischämie kommt es nach einer kurzfristigen Positivierung zu einer länger dauernden Negativierung. Bei inkompletter Gehirnischämie kommt es zu einer Negativierung der Gleichspannung, wenn der Blutdruck auf 80–40 mm Hg abgefallen ist. Es wird vermutet, daß die Negativierung bei der für das Gehirn kritischen Blutdruckhöhe beginnt.
    Notes: Summary In isolated dog head preparations the d.c. potential of the convexity of the brain (gyrus lateralis) with respect to the surface of os frontale was measured in complete and incomplete ischemia of the brain. During complete ischemia an initial positivity, reaching a maximum of 1.5 to 2 mV after 1.5 to 2.75 min, is followed by a negative shift. The negativity reaches a steady state of 6.5 mV on an average 3 to 8 min after onset of the ischemia. After termination of a complete ischemia a transitory positivity is followed by a longer lasting negativity. In incomplete ischemia the d.c. potential turns negative, when the blood pressure has decreased to 80 to 40 mm Hg. It is assumed that the negative shift begins at the critical blood pressure of the brain.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-2013
    Keywords: Anoxie ; Cerebral Cortex ; Electrophysiologie ; Anoxie ; Großhirnrinde ; Elektrophysiologie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die Gleichspannung zwischen der Konvexität des Gehirns (gyrus lateralis) und der Nase (Knochenoberfläche des os frontale) wurde an isolierten Hundeköpfen gemessen. Nach Überschreiten der Wiederbelebungszeit der cerebralen Gesamtfunktion kann die Gleichspannung wider ihren Ausgangswert erreichen. Die Reaktionsweise der Gleichspannung auf einen weiteren O2-Mangel oder auf eine Änderung der arteriellen Gasdrucke ist auch nach Überschreiten der Wiederbelebungszeit noch erhalten. Aus der Gleichspannung können keine Schlüsse auf eine noch mögliche Wiederbelebung gezogen werden.
    Notes: Summary The d.c. potential of the convexity of the brain (gyrus lateralis) with respect to the surface of os frontale was measured in isolated dog head preparations. The d.c. potential always normalizes after ischemia of the head not exceeding the revival time of the brain as a whole, it also may return to the control level following ischemic periods exceeding the cerebral revival time. Also the reactions of the d.c. potential on another oxygen deficiency or on variations in the arterial pO2 and pCO2 are still present. Conclusions on the chances of cerebral revival can not be drawn from the d.c. potential.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-2013
    Keywords: Cerebral Cortex ; Carbon Dioxide ; Oxygen ; Electrophysiology ; Großhirnrinde ; Kohlensäure ; Sauerstoff ; Elektrophysiologie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung An isolierten Hundeköpfen wurde die Gleichspannung zwischen der Konvexität des Gehirns (Gyrus lateralis) und der Nase (Knochenoberfläche des os frontale) bei Änderung des arteriellen pO2 oder pCO2 gemessen. Erniedrigung des pO2 oder pCO2 führt zu einer Negativierung, Erhöhung des pCO2 zu einer Positivierung. Erhöhung des pO2 ändert die Gleichspannung nicht.
    Notes: Summary In isolated dog head preparations the d.c. potential of the convexity of the brain (gyrus lateralis) with respect to the surface of os frontale was measured while the arterial pO2 or pCO2 were changed. Lowering of arterial pO2 or pCO2 resulted in a negative, increasing of pCO2 in a positive shift. No change of the cortical d.c. potential was found on increasing pO2.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 11 (1965), S. 1019-1025 
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Motion picture studies of condensation of isopentane bubbles rising in water elucidate the transfer mechanism involved in latent heat transport.In general, two characteristic regions are noted. In the first region, up to some 80% liquid content, the bubbles deform and oscillate and heat is transferred by turbulent convection. In the second region the rate of transfer is controlled by the resistance of the condensed liquid, and heat is mainly by conduction. The effect of temperature differences between the bubble and the continuous phase (up to 3.5°C.) on the transfer coefficients could not be isolated, whereas that of the initial diameter of the bubble was quite marked.The results are in agreement with those obtained in earlier studies of evaporating drops in immiscible liquids, indicating the similarity of the basic heat transfer mechanisms.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 11 (1965), S. 1081-1087 
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The initial drop size of volatile fluids evaporating within immiscible, nonvolatile liquids was experimentally related to the overall heat transfer coefficient in single and multiparticle systems. Coalescence and turbulence diminish the effects of the initial size, which are thus limited to the lower part of the exchanger where single-drop characteristics are maintained. Condensation data of single bubbles are in good agreement with the single-drop relationship.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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