Motor protein with nonequilibrium potential: Its thermodynamics and efficiency

Hong Qian
Phys. Rev. E 69, 012901 – Published 29 January 2004
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Abstract

A nonequilibrium potential function is introduced for a motor protein modeled by a rectified Brownian motion. This result provides a concrete case for a class of nonequilibrium systems in steady state with dissipation which possess a potential function. The potential μ is a natural generalization of the chemical potential for isothermal chemical species and μ=const if and only if the system is in an equilibrium. The steady-state flux J∝-μ, and the total heat dissipation hd equals a surface integral μJdS, representing the energy input. In terms of μ and hd the thermodynamic energy conservation in the mesoscopic stochastic system can be rigorously established and various types of motor efficiency are elucidated.

  • Received 6 December 2002

DOI:https://doi.org/10.1103/PhysRevE.69.012901

©2004 American Physical Society

Authors & Affiliations

Hong Qian

  • Department of Applied Mathematics, University of Washington, Seattle, Washington 98195, USA

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Vol. 69, Iss. 1 — January 2004

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