Models of Passive Membrane

  • Ronald J. MacGregor
  • Edwin R. Lewis


From the point of view of irreversible thermodynamics, one of the most widely used models of passive membrane is the Nernst-Planck equation, which simply combines Ohm’s law for the flow of charged particles in an electrical-potential gradient and Fick’s first law for the diffusion of particles in a concentration gradient. In writing the Nernst-Planck equation, it is customary to deal with flow densities, i.e., the number of particles flowing through a unit of area in a unit of time. This quantity, usually labeled J, is particularly useful for membranes since one often is interested in the flow of particles through a given area of membrane.


Permeability Magnesium Hydrated Titration Summing 


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Copyright information

© Plenum Press, New York 1977

Authors and Affiliations

  • Ronald J. MacGregor
    • 1
  • Edwin R. Lewis
    • 2
  1. 1.University of ColoradoBoulderUSA
  2. 2.University of CaliforniaBerkeleyUSA

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