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Phys. Rev. Lett. 83, 903–906 (1999)

Generalized Efficiency and its Application to Microscopic Engines

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Imre Derényi, Martin Bier, and R. Dean Astumian
Department of Biochemistry and Molecular Biology and Department of Surgery, MC 6035, University of Chicago, 5841 South Maryland Avenue, Chicago, Illinois 60637

Received 10 March 1999; published in the issue dated 2 August 1999

We generalize the definition of the energy output of an engine as the minimum energy input required to accomplish the same task as the engine. Applying this new concept to molecular motors makes it possible to measure their efficiency even without attaching any external load to them. This way we can compare and characterize the operation of molecular motors in various situations. We also investigate how the thermally driven motors differ from other motors.

© 1999 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.83.903
DOI:
10.1103/PhysRevLett.83.903
PACS:
05.40.Jc, 02.50.Ey, 05.70.Ce, 87.10.+e