The Journal of General Physiology
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The Journal of General Physiology, Vol 79, 507-528, Copyright © 1982 by The Rockefeller University Press

ARTICLES

Effects of solvent and solute drag on transmembrane diffusion

JT Van Bruggen, B Chalmers and M Muller

The present study compares and quantitates both solvent drag and solute drag forces in a system with both heteropore and homopore membranes. It is shown that tracer solute permeability can be increased if solution flow or driver solute flux is in the direction of tracer diffusion. Either force can decrease tracer permeability if the force can decrease tracer permeability if the force is opposite to the direction of tracer diffusion. The two forces can be additive or one force may reduce the effect of the other force. In the particular system quantitated, solute drag is shown to be some 300 times more effective than solvent drag on a mole-to-mole basis. The use of a number of solute pairs on other homopore and heteropore membranes confirms the finding that the two drag forces can be analyzed or manipulated in a variety of systems.
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