The permeability of the human red cell to deuterium oxide (heavy water)

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Abstract
Using a stopped-flow device, the osmotic water permeability of human red cells to D2O and H2O was studied as a function of temperature and under the influence of the sulfhydryl reagent paracholoromercuribenzene sulfonic acid (PCMBS), an inhibitor of water transport. The ratio, permeability (D2O)/permeability (H2O) at each temperature can be predicted simply by assuming that permeability varies inversely with macroscopic viscosity. When water permeability is inhibited with PCMBS, this dependency on viscosity vanishes; the inhibited permeabilities in D2O and H2O are indistinguishable.

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