Abstract
Abstract The reflection coefficient (σ) which is a measure of the selectivity of a membrane towards a given solute, has already been introduced into the analysis of transport by the methods of thermodynamics of irreversible processes. Here σ was measured for the “membranes” of Nitella translucens and Chara australis by a transcellular osmosis technique for ten organic solutes of low molecular weight and for heavy water. The profound effect of the unstirred layer ont he experimental values is discussed. The value of σ is discussed explicity in terms of frictional coefficients for a lipid-pore membrane model. Our results do not prove, though may indicate, that the solutes in question pass through the cell membrane via pores.
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More From: Biochimica et Biophysica Acta (BBA) - Specialized Section on Biophysical Subjects
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