TY - JOUR
T1 - Effective temperature of red-blood-cell membrane fluctuations
AU - Ben-Isaac, Eyal
AU - Park, Yongkeun
AU - Popescu, Gabriel
AU - Brown, Frank L.H.
AU - Gov, Nir S.
AU - Shokef, Yair
N1 - ISF [54/08]; Alvin and Gertrude Levine Career Development Chair, BSF [2006285]; Harold Perlman Family; National Science Foundation [CAREER 08-46660]; National Cancer Institute [R21 CA147967-01]We thank Benjamin Friedrich and Sam Safran for helpful comments. Y. S. thanks ISF grant 54/08 for support. N. S. G. thanks the Alvin and Gertrude Levine Career Development Chair, BSF grant No. 2006285 and the Harold Perlman Family for their support. G. P. is partly supported by National Science Foundation (CAREER 08-46660) and the National Cancer Institute (R21 CA147967-01).
PY - 2011/6/8
Y1 - 2011/6/8
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=79960631220&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.106.238103
DO - 10.1103/PhysRevLett.106.238103
M3 - مقالة
SN - 0031-9007
VL - 106
JO - Physical review letters
JF - Physical review letters
IS - 23
M1 - 238103
ER -