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  • Title: Potassium accumulation and sodium efflux by Porphyra perforata tissues in lithium and magnesium sea water.
    Author: EPPLEY RW.
    Journal: J Gen Physiol; 1959 Sep; 43(1):29-38. PubMed ID: 13820476.
    Abstract:
    Cells of Porphyra perforata, a red marine alga, accumulate K in the absence of concomitant Na or Li extrusion while immersed in Li- or Mg-sea waters lacking Na. This suggests that the coupling observed between K and Na transport is facultative. No evidence is obtained for net extrusion of Li. Na efflux, with the concentration gradient, is facilitated by K and is proportional to the cellular Na content. Either Na efflux does not involve an ion carrier or the number of Na sites is large. Because K accumulation has been observed in the absence of Na extrusion, but not vice versa, it seems that K uptake is the primary secretory event, with Na extrusion a secondary process dependent upon K accumulation.
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