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Effective temperature of red-blood-cell membrane fluctuations.

Authors
  • Ben-Isaac, Eyal
  • Park, Yongkeun
  • Popescu, Gabriel
  • Brown, Frank L H
  • Gov, Nir S
  • Shokef, Yair
Type
Published Article
Journal
Physical Review Letters
Publisher
American Physical Society
Publication Date
Jun 10, 2011
Volume
106
Issue
23
Pages
238103–238103
Identifiers
PMID: 21770546
Source
Medline
License
Unknown

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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