From owner-biophysics@net.bio.net Sun Jan 25 22:00:00 1998
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From: "Jonathan B. Marder" <marder@agri.huji.ac.il>
Newsgroups: bionet.biophysics
Subject: Re: Chemiosmotic events
Date: Mon, 26 Jan 1998 11:26:50 +0200
Organization: Hebrew University
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Pentcho Valev wrote in message =
+ADw-6a08ao+ACQ-hov+AEA-mserv1.dl.ac.uk+AD4-...
...
+AD4-Let us imagine two adjacent spots on the membrane:
+AD4-
+AD4--------------low-capacitance------high-capacitance------------------=
----
+AD4-
+AD4-For the transmembrane potential difference to be the same across =
the two
+AD4-spots, the surface charge density (of H and the respective =
counterion)
+AD4-must be different. But this is extraordinary - consider only H on =
one side
+AD4-of the membrane - we have, laterally, a constant potential but a H
+AD4-concentration gradient, i.e. we can expect a lateral H flow at =
equilibrium.
+AD4-What do you think?


I would say that any lateral concentration gradient will be=20
offset by a lateral electrical potential gradient. Thus the lateral
proton-motive force would be zero.

Regards, Jonathan




.