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. 1967 Nov 1;50(10):2391–2405. doi: 10.1085/jgp.50.10.2391

Permeability Studies on Red Cell Membranes of Dog, Cat, and Beef

G T Rich 1, R I Sha'afi 1, T C Barton 1, A K Solomon 1
PMCID: PMC2225667  PMID: 6063688

Abstract

Water permeability coefficients of dog, cat, and beef red cell membranes have been measured under an osmotic pressure gradient. The measurements employed a rapid reaction stop flow apparatus with which cell shrinking was measured under a relative osmotic pressure gradient of 1.25 to 1.64 times the isosmolar concentration. For the dog red cell the osmotic permeability coefficient is 0.36 cm4/(sec, osmol). The water permeability coefficient for the dog red cell under a diffusion gradient was also measured (rate constant = 0.10/msec). The ratio between the two permeabilities was used to calculate an equivalent pore radius of 5.9 A. This value agrees welt with an equivalent pore radius of 6.2 A obtained from reflection coefficients of nonelectrolyte water-soluble molecules, and is consistent with data on the permeability of the dog red cell membrane to glucose. These data provide evidence supporting the existence of equivalent pores in single biological membranes.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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