Permeability of the Duodenum of the Toad to Non-Electrolytes

Abstract

The reflection coefficients (0") for the permeation, from serosa to mucosa, of 59 different non-electrolytes through the duodenum of the toad have been measured by the method used by Diamond and Wright (1969a) with the rabbit gall bladder. In this method 0" for the solute is the ratio of the streaming potential across the epithelium, resulting from a water flow caused by an osmotic gradient of the test solute, to the streaming potential caused by water flow resulting from an equal osmotic gradient of impermeant solute.