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Abstract

Transport phenomena have a fundamental role in cellular activity. The evidence of a limiting barrier is given by the fact that the content of living cells differs from that of the medium. In most cases the concentration of Ka+ in the cell is ten or more times higher than that of Na+, even in cells immersed in a medium where Na+ concentration exceeds K. As Fenn (1940) has put it “potassium is of the soil and not of the sea; it is of the cell but not of the sap”.

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Copyright information

© Springer-Verlag Wien 1967

Authors and Affiliations

  • E. Tria
    • 1
    • 2
  • O. Barnabei
    • 1
    • 2
  1. 1.Institute of General PhysiologyUniversity of RomeItaly
  2. 2.Institute of General PhysiologyUniversity of FerraraItaly

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