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1. Slices of rat cerebral cortex, incubated anaerobically at 37 degrees , lost K(+) from an initial concentration of 102m-equiv./kg. to a concentration of 57m-equiv./kg. after 10min. On subsequent aerobic incubation they regained K(+) rapidly at a rate that varied with the K(+) concentration of the medium. 2. Lower aliphatic alcohols, present at equal thermodynamic activity, produced approximately equal degrees of inhibition of K(+) uptake during the aerobic incubation. This inhibition was reduced by an increase in K(+) content of the medium. Ethanol did not affect the rate of K(+) loss during anaerobic incubation. 3. Li(+), in concentrations of 1-10mm, also inhibited K(+) uptake by brain-cortex slices, the degree of inhibition varying with the Li(+) concentration. Ouabain also inhibited K(+) uptake. 4. The same series of alcohols, at equal thermodynamic activity, produced comparable degrees of inhibition of Na(+),K(+),Mg(2+)-stimulated adenosine-triphosphatase activity in brain microsomes. 5. It is suggested that inhibition of cation transport is an important, but not a primary, mechanism in the production of central nervous depression by alcohols and other substances.

Effects of lower alcohols on potassium transport and microsomal adenosine-triphosphatase activity of rat cerebral cortex