NDLI: A measure for the distance from equilibrium

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European Biophysics Journal : Volume 27, Issue 2, February 1998

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A measure for the distance from equilibrium

Content Provider	Springer Nature Link
Author	Schindler, H. Pastushenko, V. P. Titulaer, U. M.
Copyright Year	1998
Abstract	Subcellular systems represented by macromolecules (enzymes, ion channels etc.) function far from equilibrium. We propose a characterization of such systems in terms of their distance from equilibrium (DFE). Standard chemical and physical approaches are not always applicable because they need too detailed kinetic and thermodynamic information. We suggest a general measure for DFE in systems described by fluxes. Each connection between subsystems corresponds to two unidirectional fluxes, f and b. These fluxes form forward and backward vectors, ? and ?, respectively. The forward direction is defined by a net flux, so that 0≤b≤f. The flux vec-tors ℜ={?, ?} and ?={?, –?} are introduced. DFE is defined as P=(ℜ?/??)2=cos2 α, α being the angle between the ℜ- and ?-vectors, with 0≤α≤π/2. The distance from strict irreversibility, E, is defined symmetrically: E=cos2(π/2–α)=1–P. For a single-stage reaction, parameter P is strictly equivalent to the chemical affinity. For multi-stage reactions P reflects DFE better than chemical affinity. Near equilibrium P is equivalent to excess Gibbs energy. Away from equilibrium, P scales DFE better.
Starting Page	219
Ending Page	226
Page Count	8
File Format	PDF
ISSN	01757571
Journal	European Biophysics Journal
Volume Number	27
Issue Number	3
e-ISSN	14321017
Language	English
Publisher	Springer-Verlag
Publisher Date	1998-04-27
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Medicine Biophysics

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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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