Abstract
1. 1. The effects of external potassium concentration on potassium uptake and potassium permeability have been investigated in isolated chicken enterocytes. 2. 2. Ouabain-sensitive K + uptake exhibited simple saturation kinetics with an apparent affinity constant, k t , of approximately, 1 mM K +. In the presence of ouabain, K + uptake relates linearly with its external concentration, and the apparent diffusion constant, K D , was 1.3 nmol mg −1 protein mM −1 min −1. 3. 3. Membrane potential, evaluated from the transmembrane TPP + distribution ratio, was lower than the potassium equilibrium potential. 4. 4. Estimated potassium permeability is decreased by low external potassium concentration and unaffected by high external potassium concentration.
Published Version
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