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DY: Fachverband Dynamik und Statistische Physik

DY 43: Nonlinear Dynamics, Synchronizsation and Chaos

DY 43.7: Vortrag

Donnerstag, 23. März 2017, 11:00–11:15, ZEU 118

The load-response of the flagellar beat and its implications for synchronization — •Gary Klindt¹, Christian Ruloff², Christian Wagner^2,3, and Benjamin Friedrich⁴ — ¹MPI PKS, Dresden, Germany — ²University of the Saarland, Saarbrücken, Germany — ³University of Luxemburg, Luxemburg — ⁴TU Dresden, Germany

Cilia and flagella exhibit regular bending waves that perform mechanical work on the surrounding fluid, to propel cellular swimmers and pump fluids inside organisms. Conversely, hydrodynamic forces feedback on flagellar oscillations, changing speed and shape of the flagellar beat. This flagellar load-response is a prerequisite for self-organized synchronization observed in collections of cilia and flagella.

Here, we combine theory and experiment to comprehensively characterize the load-response of the flagellar beat, including stalling of flagellar oscillations at high load [1]: Our description of the flagellar beat as a limit-cycle oscillations is calibrated by experimental data of flagellated Chlamydomonas cells exposed to controlled microfluidic flows.

Remarkably, in our simulations, two previously suggested mechanisms of flagellar synchronization, (i) flagellar waveform compliance, and (ii) elastic coupling between flagellar bases, each stabilize anti-phase synchronization, yet their combination stabilizes in-phase synchrony as observed in experiments.

[1] G.S. Klindt, C. Ruloff, C. Wagner, B.M. Friedrich, Load-response of the flagellar beat, accepted at Phys. Rev. Lett.