The Journal of General Physiology, Vol 58, 287-303,
Copyright © 1971 by The Rockefeller University Press
Water Permeability of Isolated Muscle Fibers of a Marine Crab
A. L. Sorenson 1
1 From the Department of Zoology, University of Washington, Seattle, Washington 98105.
Dr. Sorenson's present address is Department of Biology, Brooklyn College of The City University of New York, Brooklyn, New York 11210.
This report deals with the diffusional and nondiffusional water fluxes of muscle fibers of the crab, Chionoecetes bairdi. Graphical analysis of the deuterium exchange indicates that two fiber compartments exist for water. The first, comprising about 60–70% of the fiber water, probably represents the sarcoplasm which is bounded externally by the plasma membrane. The second compartment might represent intracellular organelles. The ratio between the nondiffusional and diffusional fluxes is very much larger than that found earlier for erythrocytes and for the giant axon of the squid. A ratio of such size is unlikely to be caused by unstirred layers and more accurate determinations of the water flux must include study of the influence of the complex morphology of these muscle fibers.
Submitted on February 19, 1970
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