Biology – Quantitative Biology – Subcellular Processes
Scientific paper
2006-07-14
PLoS ONE, Vol. 2, e144 (2007)
Biology
Quantitative Biology
Subcellular Processes
11 pages
Scientific paper
10.1371/journal.pone.0000144
Chemical reaction systems operating in nonequilibrium open-system states arise in a great number of contexts, including the study of living organisms, in which chemical reactions, in general, are far from equilibrium. Here we introduce a theorem that relates forward and re-verse fluxes and free energy for any chemical process operating in a steady state. This rela-tionship, which is a generalization of equilibrium conditions to the case of a chemical process occurring in a nonequilibrium steady state, provides a novel equivalent definition for chemical reaction free energy. In addition, it is shown that previously unrelated theories introduced by Ussing and Hodgkin and Huxley for transport of ions across membranes, Hill for catalytic cycle fluxes, and Crooks for entropy production in microscopically reversible systems, are united in a common framework based on this relationship.
Beard Daniel A.
Qian Hong
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