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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Archives of gynecology and obstetrics 226 (1978), S. 31-38 
    ISSN: 1432-0711
    Keywords: Gewebe-pH-Wert ; Elektrode ; Hyperkapnie ; Kaninchen ; Tissue pH ; Electrode ; Hypercarbia ; Rabbit
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Continuous tissue pH and intermittent central arterial pH were measured in six rabbits during 10-min exposures to a mixture of 10% CO2 and 90% O2. In control and recovery situations tissue pH was more acidic than arterial pH by a mean value of 0.07 pH units. During periods of rapidly increasing pCO2, the steady state relationship was inverted with tissue pH being more alkaline than arterial pH. After a second exposure to CO2, mean tissue pH values did not recover to baseline. It is concluded that in the rabbit during acute hypercarbia, the relationship of tissue to central pH is variable. The possible implications of these results in human fetuses during labor are discussed.
    Notes: Zusammenfassung Bei sechs Kaninchen wurde kontinuierlich der Gewebe-pH-Wert und diskontinuierlich der zentrale arterielle pH-Wert gemessen, während die Tiere 10 min lang mit 10% CO2 und 90% O2 beatmet wurden. In der Kontroll- und Erholungszeit waren die Gewebe-pH-Werte um durchschnittlich 0,07 pH-Einheiten saurer als die arteriellen pH-Werte. Während der Zeitabschnitte mit schnell ansteigenden PO2-Werten kehrte sich diese „steady-state-Beziehung“ um, so daß der Gewebe-pH-Wert alkalischer als der arterielle pH-Wert war. Nach einer zweiten Beatmung mit CO2 erholten sich die Gewebe-pH-Werte nicht mehr bis auf die Ausgangswerte. Es wird daraus geschlossen, daß beim Kaninchen die Beziehungen zwischen den Gewebe- und zentralen pH-Werten während akuter Hyperkapnie unterschiedlich sind. Es werden die möglichen Schlußfolgerungen diskutiert, die sich aus diesen Ergebnissen für den menschlichen Feten unter der Geburt ergeben.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of solution chemistry 3 (1974), S. 1-14 
    ISSN: 1572-8927
    Keywords: Aqueous ; electrostriction ; ion-solvent interactions ; partial molar volumes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The temperature variation of the limiting partial molar volumes of a number of electrolytes in aqueous solution has been examined in terms of solvent electrostriction. The Desnoyers, Verrall, and Conway theory has been modified and extended to cover the temperature range 0–100°C. It has been shown that electrostriction effects alone cannot account for the observed maxima in the V° −T plots for various electrolytes. It is concluded that solvent structural changes over this temperature range may well be important.
    Type of Medium: Electronic Resource
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