From owner-biophys@hgmp.mrc.ac.uk Tue Nov 7 04:16:16 2000 Return-Path: Received: by mercury.hgmp.mrc.ac.uk (Postfix, from userid 110) id ACEBD17B42; Tue, 7 Nov 2000 04:16:15 +0000 (GMT) Received: by mercury.hgmp.mrc.ac.uk (Postfix, from userid 6024) id 2B21B17A6E; Tue, 7 Nov 2000 04:16:14 +0000 (GMT) Received: from niobium.hgmp.mrc.ac.uk (niobium [193.62.192.41]) by mercury.hgmp.mrc.ac.uk (Postfix) with ESMTP id 97A93415DC for ; Tue, 7 Nov 2000 04:16:09 +0000 (GMT) Received: (from news@localhost) by niobium.hgmp.mrc.ac.uk (8.9.3+Sun/8.8.8) id EAA23605 for biophys-list@hgmp.mrc.ac.uk; Tue, 7 Nov 2000 04:16:08 GMT X-Authentication-Warning: niobium.hgmp.mrc.ac.uk: news set sender to using -f From: Axel Boldt X-Newsgroups: sci.chem.analytical,sci.physics,bionet.biophysics Subject: Electrophoresis: why mobility linear in log(weight)? Date: 07 Nov 2000 05:15:58 +0100 Organization: none Lines: 14 Message-ID: X-Trace: news.uni-paderborn.de 973570560 29097 131.234.38.3 (7 Nov 2000 04:16:00 GMT) X-Complaints-To: usenet@news.uni-paderborn.de X-Newsreader: Gnus v5.5/Emacs 20.3 To: biophys@hgmp.mrc.ac.uk Sender: owner-biophys@hgmp.mrc.ac.uk Precedence: bulk Hi, in gel electrophoresis of particles whose charges are proportional to their molecular masses and whose shapes are "long strings", the observed velocity depends roughly linearly on the logarithm of the molecular mass (if applied voltage, temperature, particle density, pH, gel concentration, ionic strength etc. are constant). Can anybody think of a model that would predict this relationship? Thanks, Axel -- Axel Boldt ** axel@uni-paderborn.de ** math-www.uni-paderborn.de/~axel/ Sponsor free software at the Free Software Bazaar visar.csustan.edu/bazaar/ .