Effective Temperature of Red-Blood-Cell Membrane Fluctuations

Eyal Ben-Isaac, YongKeun Park, Gabriel Popescu, Frank L. H. Brown, Nir S. Gov, and Yair Shokef
Phys. Rev. Lett. 106, 238103 – Published 8 June 2011
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Abstract

Biologically driven nonequilibrium fluctuations are often characterized by their non-Gaussianity or by an “effective temperature”, which is frequency dependent and higher than the ambient temperature. We address these two measures theoretically by examining a randomly kicked particle, with a variable number of kicking motors, and show how these two indicators of nonequilibrium behavior can contradict. Our results are compared with new experiments on shape fluctuations of red-blood cell membranes, and demonstrate how the physical nature of the motors in this system can be revealed using these global measures of nonequilibrium.

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  • Received 31 January 2011

DOI:https://doi.org/10.1103/PhysRevLett.106.238103

© 2011 American Physical Society

Authors & Affiliations

Eyal Ben-Isaac1, YongKeun Park2, Gabriel Popescu3, Frank L. H. Brown4, Nir S. Gov1,*, and Yair Shokef5,†

  • 1Department of Chemical Physics, The Weizmann Institute of Science, Rehovot 76100, Israel
  • 2Department of Physics, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Republic of Korea
  • 3Quantitative Light Imaging Laboratory, Department of Electrical and Computer Engineering, Beckman Institute for Advanced Science & Technology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
  • 4Department of Chemistry and Biochemistry and Department of Physics, University of California Santa Barbara, California 93106, USA
  • 5Department of Materials and Interfaces, The Weizmann Institute of Science, Rehovot 76100, Israel

  • *nir.gov@weizmann.ac.il
  • yair.shokef@weizmann.ac.il

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Issue

Vol. 106, Iss. 23 — 10 June 2011

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