since it has been demonstrated recently , that these cation pathways do not conform to a constant field scheme ( bennekou , p. and christophersen , p. ( 1986 ) j. membr . biol . 93 , 221-227 and vestergaard-bogind , b. , stampe , p. and christophersen , p. ( 1985 ) j. membr . biol . 88 , 67-75 ) , it has been chosen , instead of permeabilities , to calculate the ion conductances from net efflux data , using an independent estimate of the membrane potential .
C0007447
cation
C0022023
ion