. Electrolytes in biological systems, incorporating papers presented at a symposium at the Marine Biological Laboratory in Woods Hole, Massachusetts, on September 8, 1954. Electrophysiology; Electrolytes; Electrolytes; Electrophysiology; Physiology, Comparative. ASER ROTHSTEIN 85 proceeds at the same high rate over the pii range to almost The most pronounced effects of K+ are seen at those H+ ion concentrations where the rates are lowest. In fact, at pH and , the rate of fermentation may be almost zero unless K+ is present. Other monovalent cations also have a pro- nounced effe
. Electrolytes in biological systems, incorporating papers presented at a symposium at the Marine Biological Laboratory in Woods Hole, Massachusetts, on September 8, 1954. Electrophysiology; Electrolytes; Electrolytes; Electrophysiology; Physiology, Comparative. ASER ROTHSTEIN 85 proceeds at the same high rate over the pii range to almost The most pronounced effects of K+ are seen at those H+ ion concentrations where the rates are lowest. In fact, at pH and , the rate of fermentation may be almost zero unless K+ is present. Other monovalent cations also have a pro- nounced effect on fermentation at certain values of extracellular pii. Rubidium. Fig. II. The influence of pH on the uptake of glucose and on the jiroduction of alcohol, lycerol, and COj. Table 6. Effect of NH4+ and k+ on the rate of fermentation or glucose at DIFFERENT PH's pH PH s-o pH Control NH4+ K+ 24-3 25-3 54-1 43-9 55-4 55-9 Rates are expressed as ^il. of C02/mg of yeast (wet weight) per hour. Ion concentrations were .03 m/1. Buffer, triethylamine (TEA) succinate, tartrate. Glucose, m/1. is about half as effective as potassium. Sodium, lithium and cesium all show smaller but significant effects (table 7). None of these ions interferes with the stimulating action of potassium. Ammonium ion is different in its action. It stimulates to the same extent as potassium at pH , but in contrast, has little effect below pH (table 6). The interaction of potassium and hydrogen ion has been investigated in some detail in the low pii range (48). As the pn is decreased below , the rate of metabolism decreases, but the addition of potassium in appropriate. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Shanes, Abraham M. (Abraham Morris), 1917-; Society of General Physiologists. Washington,
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