. Biological structure and function; proceedings. Biochemistry; Cytology. COMPARATIVE STUDY OF MEMBRANE PERMEABILITY 627 intestine and Xa selective in the colon and frog skin. The inner membrane is Xa and K selective in the colon and small intestine while it is K selective in the frog skin. The active transport mechanism for Xa is located at both outer and inner faces in the small intestine while it is located at the inner membrane in the colon and the frog skin. Koefoed-Johnsen and Ussing [4] have demonstrated that in frog skin, the active transport of Xa is in fact a forced exchange for K. T
. Biological structure and function; proceedings. Biochemistry; Cytology. COMPARATIVE STUDY OF MEMBRANE PERMEABILITY 627 intestine and Xa selective in the colon and frog skin. The inner membrane is Xa and K selective in the colon and small intestine while it is K selective in the frog skin. The active transport mechanism for Xa is located at both outer and inner faces in the small intestine while it is located at the inner membrane in the colon and the frog skin. Koefoed-Johnsen and Ussing [4] have demonstrated that in frog skin, the active transport of Xa is in fact a forced exchange for K. This has not yet been demonstrated in the intestinal epithelium. Such a picture describes satisfactorily how the potential difference develops under a wide varietv of conditions. Let us first consider the small intestine cell in the presence of a non-penetrating anion (Fig. i, A). Xa diffuses into the Mucosal or outside Serosal or inside OK. K(7) Small intestine. 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 IUB/IUBS International Symposium (1st : 1960 : Stockholm); International Union of Biochemistry; International Union of Biological Sciences; Goodwin, T. W. (Trevor Walworth); Lindberg, Olov, 1914-. London, New York, Academic Press
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