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Internal friction controls active ciliary oscillations near the instability threshold

Mondal, D and Adhikari, R and Sharma, P (2020) Internal friction controls active ciliary oscillations near the instability threshold. In: Science Advances, 6 (33).

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Official URL: https://dx.doi.org/10.1126/sciadv.abb0503


Ciliary oscillations driven by molecular motors cause fluid motion at micron scale. Stable oscillations require a substantial source of dissipation to balance the energy input of motors. Conventionally, it stems from external fluid. We show, in contrast, that external fluid friction is negligible compared to internal elastic stress through a simultaneous measurement of motion and flow field of an isolated and active Chlamydomonas cilium beating near the instability threshold. Consequently, internal friction emerges as the sole source of dissipation for ciliary oscillations. We combine these experimental insights with theoretical modeling of active filaments to show that an instability to oscillations takes place when active stresses are strain softening and shear thinning. Together, our results reveal a counterintuitive mechanism of ciliary beating and provide a general experimental and theoretical methodology to analyze other active filaments, both biological and synthetic ones. Copyright © 2020 The Authors.

Item Type: Journal Article
Publication: Science Advances
Publisher: American Association for the Advancement of Science
Additional Information: The copyright of this article belongs to American Association for the Advancement of Science
Keywords: Shear thinning, Elastic stress; Fluid friction; Fluid motions; Molecular motors; Simultaneous measurement; Stable oscillations; Strain-softening; Theoretical modeling, Internal friction, article; Chlamydomonas; ciliary motility; friction; nonhuman; oscillation; stress; theoretical study
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 07 Sep 2020 07:25
Last Modified: 07 Sep 2020 07:25
URI: http://eprints.iisc.ac.in/id/eprint/66486

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