. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ION TRANSPORT IN VALONIA 341 potential (Walker, 1955; Kishimoto, 1959; Nagai and Kishimoto, 1964; Findlay and Hope, 1964; Spanswick and Williams, 1964). At the plasmalemma, both the large negative potential and the active extrusion of Na+ are features common to many cells. Two other marine algae, Halicystis and Porphyra, show cytoplasmic potentials of —SO and -42 mv, respectively (Blount and Levedahl, 1960; R. W. Eppley, personal communication). In fresh-water algae and higher plants the plasmalemma potentials are usually so
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ION TRANSPORT IN VALONIA 341 potential (Walker, 1955; Kishimoto, 1959; Nagai and Kishimoto, 1964; Findlay and Hope, 1964; Spanswick and Williams, 1964). At the plasmalemma, both the large negative potential and the active extrusion of Na+ are features common to many cells. Two other marine algae, Halicystis and Porphyra, show cytoplasmic potentials of —SO and -42 mv, respectively (Blount and Levedahl, 1960; R. W. Eppley, personal communication). In fresh-water algae and higher plants the plasmalemma potentials are usually somewhat larger (Walker, 1955; Umrath, 1956; Findlay and Hope, 1964; Spanswick and Williams, 1964). Finally, the outward transport of Na+, possibly coupled with an inward transport of K+, occurs at the outer plasma membrane of many plant and animal cells (see Dainty, 1962, 1964). The suitability of Valonia for salt-transport studies is questioned by Steward CONCENTRATIONS mM POTENTIALS mv. FIGURE 2. Ionic relations in V. rcntricosa. Provisional scheme showing concentrations, fluxes, and potentials. Large arrows indicate active Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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