A DUAL EFFECT OF SODIUM ON OXYGEN CONSUMPTION IN TOAD BLADDER

被引:6
作者
HERSEY, SJ
机构
[1] Department of Physiology and Pharmacology, Duke University, Durham, NC
关键词
D O I
10.1016/0005-2736(69)90139-4
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
1. 1. QO2 measured in a Warburg respirometer was found to be stimulated by the addition of external Na+. The relationship between extra QO2 and the concentration of Na+ displays saturation kinetics, the maximal effect occurring at 40-60 mM. 2. 2. 2,4-Dinitrophenol stimulated QO2 and inhibited the short-circuit current (s.c.c.). The maximally effective concentration of dinitrophenol was the same for both, 5·10-5-10·10-5M. 3. 3. The addition of Na+ (40 mM) in the presence of dinitrophenol (1·10-4M) produced a further marked stimulation of QO2. The effects of varying the concentration of dinitrophenol on this Na+-independent QO2 paralleled the effects on s.c.c. and Na+-independent QO2. 4. 4. The results are interpreted as showing a direct stimulation of the respiratory chain by Na+ per se. © 1969.
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页码:155 / &
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