From owner-metabolic-reg@net.bio.net Wed Dec 22 22:00:00 1993 Path: biosci!daresbury!not-for-mail From: "" Newsgroups: bionet.metabolic-reg Subject: exothermic or endothermic? Date: 23 Dec 1993 09:52:24 -0000 Lines: 9 Sender: daemon@mserv1.dl.ac.uk Distribution: bionet Message-ID: <2fbpoo$shj@mserv1.dl.ac.uk> Original-To: btk-mca@dl.ac.uk In my humble opinion, the fact that a process is driven by energy influx does not necessarily make this process endothermic. The point is that DeltaG (change in Gibbs Free Energy) need not have the same sign as DeltaH (change in enthalpy). If a process has a positive DeltaG, i.e. it has to be driven to operate, it may have positive or negative DeltaH, which gives the heat exchange. Stefan=Schuster @ rz.hu-berlin.de .