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Potassium Channel ion rate and Gradient

  1. Jul 11, 2009 #1

    somasimple

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    Gold Member

    Hi All,
    A potassium channel is designed to filter out potassium ions at a maximum rate of 100,000,000 ions s-1
    A common concentration (cell's interior) of potassium is 100 mM and 5 mM outside.
    This means there is 553 water molecules for 1 potassium ion inside (55.3/0.100) and 11,060 water molecules for a ion outside (55.3/0.005).
    https://www.physicsforums.com/showthread.php?t=247778

    If the channel acts as a sieve then what happen to the local concentrations, inside and outside?

    ref:
    rate =>
    http://www.pdb.org/pdb/static.do?p=education_discussion/molecule_of_the_month/pdb38_1.html
    water =>
    http://www.pdb.org/pdb/static.do?p=education_discussion/molecule_of_the_month/pdb38_4.html

    ps: local concentration (concentration that exists just around the channel ~ few nm)
     
  2. jcsd
  3. Apr 20, 2010 #2

    somasimple

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    Gold Member

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