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Biophys. J. BioFAST: First Published May 11, 2007. doi:10.1529/biophysj.106.103507
© 2007 by the Biophysical Society.

A more recent version of this article appeared on August 1, 2007.
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BIOPHYSICAL THEORY AND MODELING

Development of Linear Irreversible Thermodynamic Model for Oxidation Reduction Potential in Environmental Microbial System

Hong-Bang Cheng 1, Mathava Kumar 1 and Jih-Gaw Lin 1*

1 Institute of Environmental Engineering, National Chiao Tung University

* To whom correspondence should be addressed. E-mail: jglin{at}mail.nctu.edu.tw.

Submitted on December 21, 2006
Revised on January 29, 2007
Accepted on 11 April 2007


  Abstract
Nernst equation has been directly used to formulate the oxidation reduction potential (ORP) of reversible thermodynamic conditions but applied to irreversible conditions after several assumptions and/or modifications. However, the assumptions are sometimes inappropriate in the quantification of ORP in non-equilibrium system. We propose a linear non-equilibrium thermodynamic model, called microbial related reduction and oxidation reaction (MIRROR) Model No. 1 for the interpretation of ORP in biological process. The ORP was related to the affinities of catabolism and anabolism. The energy expenditure of catabolism and anabolism was directly proportional to overpotential ({eta}), straight coefficient of electrode (LEE) and degree of coupling between catabolism and ORP electrode, respectively. Finally, the limitations of MIRROR Model No. 1 were discussed for expanding the applicability of the model.

Key Words: Bioenergetics, MIRROR model, linear non-equilibrium thermodynamics, microbial-related reduction and oxidation reaction, redox potential






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Copyright © 2007 by the Biophysical Society.