The effect of electrolytes on the respiration of pigeon breast muscle

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Abstract
The O2 uptake of minced pigeon breast muscle suspended in various saline media was measured. The optimal K conc. was found to be 0.0385 M if the medium contained 0.02 M phosphate and 0.0425 M NaCl. The optimal K conc. was much lower (0.0034 M) when the medium contained 0.02 M phosphate, 0.092 M NaCl and 0.00085 M MgSO4. The optimal Mg conc. depends on the conc. of K and may vary between 0.00085 and 0.01 M. Mg and K can partially, but not completely, replace one another. Mn increases the O2 uptake of muscle suspended in phosphate buffer, but does not replace Mg.

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