Hydrodynamic instabilities provide a generic route to spontaneous biomimetic oscillations in chemomechanically active filaments

Abhrajit Laskar, Rajeev Singh, Somdeb Ghose, Gayathri Jayaraman, P. B. Sunil Kumar, R. Adhikari

Research output: Contribution to journalArticlepeer-review

41 Scopus citations

Abstract

Non-equilibrium processes which convert chemical energy into mechanical motion enable the motility of organisms. Bundles of inextensible filaments driven by energy transduction of molecular motors form essential components of micron-scale motility engines like cilia and flagella. The mimicry of cilia-like motion in recent experiments on synthetic active filaments supports the idea that generic physical mechanisms may be sufficient to generate such motion. Here we show, theoretically, that the competition between the destabilising effect of hydrodynamic interactions induced by force-free and torque-free chemomechanically active flows, and the stabilising effect of nonlinear elasticity, provides a generic route to spontaneous oscillations in active filaments. These oscillations, reminiscent of prokaryotic and eukaryotic flagellar motion, are obtained without having to invoke structural complexity or biochemical regulation. This minimality implies that biomimetic oscillations, previously observed only in complex bundles of active filaments, can be replicated in simple chains of generic chemomechanically active beads.

Original languageEnglish
Article number1964
JournalScientific Reports
Volume3
DOIs
StatePublished - 11 Jun 2013
Externally publishedYes

Bibliographical note

Funding Information:
Financial support from PRISM II, Department of Atomic Energy, Government of India and computing resources through HPCE, IIT Madras and Annapurna, IMSc are gratefully acknowledged. We thank M. E. Cates, Z. Dogic, D. Frenkel, G. Baskaran, I. Pagonabarraga, and R. Simon for helpful discussions, and P. V. Sriluckshmy for help with Bayesian analysis.

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