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@ARTICLE{Turlier:811858,
author = {Turlier, H. and Fedosov, Dmitry and Audoly, B. and Auth,
Thorsten and Gov, N. S. and Sykes, C. and Joanny, J.-F. and
Gompper, Gerhard and Betz, T.},
title = {{E}quilibrium physics breakdown reveals the active nature
of red blood cell flickering},
journal = {Nature physics},
volume = {12},
number = {5},
issn = {1745-2481},
address = {Basingstoke},
publisher = {Nature Publishing Group},
reportid = {FZJ-2016-04200},
pages = {513 - 519},
year = {2016},
abstract = {Red blood cells, or erythrocytes, are seen to flicker under
optical microscopy, a phenomenon initially described as
thermal fluctuations of the cell membrane. But recent
studies have suggested the involvement of non-equilibrium
processes, without definitively ruling out equilibrium
interpretations. Using active and passive microrheology to
directly compare the membrane response and fluctuations on
single erythrocytes, we report here a violation of the
fluctuation–dissipation relation, which is a direct
demonstration of the non-equilibrium nature of flickering.
With an analytical model of the composite erythrocyte
membrane and realistic stochastic simulations, we show that
several molecular mechanisms may explain the active
fluctuations, and we predict their kinetics. We demonstrate
that tangential metabolic activity in the network formed by
spectrin, a cytoskeletal protein, can generate
curvature-mediated active membrane motions. We also show
that other active membrane processes represented by direct
normal force dipoles may explain the observed membrane
activity. Our findings provide solid experimental and
theoretical frameworks for future investigations of the
origin and function of active motion in cells.},
cin = {ICS-2},
ddc = {530},
cid = {I:(DE-Juel1)ICS-2-20110106},
pnm = {553 - Physical Basis of Diseases (POF3-553)},
pid = {G:(DE-HGF)POF3-553},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000375255000025},
doi = {10.1038/nphys3621},
url = {https://juser.fz-juelich.de/record/811858},
}