Berlin 2015 – wissenschaftliches Programm

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BP: Fachverband Biologische Physik

BP 20: Microswimmers, Active Liquids II (joint DY/BP/CPP)

BP 20.4: Vortrag

Dienstag, 17. März 2015, 10:15–10:30, BH-N 128

Non-linear dynamics of self-organized ciliary beats — •pablo sartori and frank julicher — Max Planck Institute for the Physics of Complex Systems. Noethnitzer Strasse 38 , 01187, Dresden, Germany.

The dynamic bending of cilia is driven by forces generated by dynein motor proteins. These forces slide adjacent microtubule doublets within the cilium. To create oscillatory beating patterns the activities of the dyneins must be coordinated both spatially and temporally. It is believed that this coordination occurs via the self-organization of the motors along the cilium, which are regulated by local strains such as sliding or cuvature. Yet which strain is the most relevant in regulation remains an elusive question.

In this work we show that self-organization of the motors is possible via a dynamic instability. We study the emerging beat patterns close and far from the critical point. By comparing two different motor regulatory mechanisms, sliding and curvature regulation, we conclude that the first only produces propulsion for long cilia, while the second does so also for short cilia. Our work thus suggests that short cilia may be regulated via curvature, and not sliding of the filaments.