Motivated by diverse phenomena in cellular biophysics, including bacterial flagellar motion and DNA transcription and replication, we study the overdamped nonlinear dynamics of a rotationally forced filament with twist and bend elasticity. Competition between twist injection, twist diffusion, and writhing instabilities is described by coupled PDEs for twist and bend evolution. Analytical and numerical methods elucidate the twist/bend coupling and reveal two regimes separated by a Hopf bifurcation: (i) diffusion-dominated axial rotation, or twirling, and (ii) steady-state crankshafting motion, or whirling. The consequences of these phenomena for self-propulsion are investigated, and experimental tests proposed.
Twirling and whirling: viscous dynamics of rotating elastic filaments.
C. Wolgemuth,T. Powers,Raymond E. Goldstein Department of Physics,Program in Applied Mathematics,U. Arizona,Division of Engineering,A. Sciences,Harvard University
Published 1999 in Physical Review Letters
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- Publication year
1999
- Venue
Physical Review Letters
- Publication date
1999-12-20
- Fields of study
Biology, Medicine, Physics
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Semantic Scholar, PubMed
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