Colloquium
Department of Physics, NCU
Collective dynamics of cilia and flagella by hydrodynamic interaction
Speaker
Prof. Nariya Uchida
Tohoku University
Date 2016.03.01(Tue)
Time 14:00
Place S4-625
Abstract:
Coordinated motion of cilia and flagella facilitate self-propulsion of cells in viscous environment. For example, the surface of a Paramecium is covered by several thousands of cilia that beat in synchrony to form propagating waves on the cell surface (metachronal waves). An E. Coli has several helical flagella that are switched between bundled and unbundled states to cause the run-and-tumble motion. Collective pumping by flagella has potential application to microfluidic devices, as recently demonstrated by bacterial carpets. In this talk, I will address the roles of long-range hydrodynamic interaction in (i) synchronization and metachronal waves of cilia and (ii) collective flow patterns in model bacterial carpets. The rotor models we introduce are simple and generic enough to discuss its relations to (i) phase transition in vector spin magnets (XY model) and (ii) a mean-field model of synchronization (Kuramoto model).
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