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Long-range interactions, wobbles, and phase defects in chains of model cilia
Douglas R Brumley1,2, Nicolas Bruot3,4, Jurij Kotar4
1Ralph M. Parsons Laboratory, Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Physical Review Fluids
|August 21, 2018
Summary
Eukaryotic cilia and flagella synchronization transitions from traveling waves to complex patterns. Wall proximity alters hydrodynamic interactions, influencing collective dynamics and revealing chimera-like states in ciliated systems.
Area of Science:
- Biophysics
- Fluid Dynamics
- Cell Biology
Background:
- Eukaryotic cilia and flagella are essential for cell motility and fluid transport.
- Their coordinated motion generates metachronal waves, crucial for biological processes.
- Pair synchronization is necessary but not sufficient for collective phase-locking due to long-range interactions.
Purpose of the Study:
- To investigate the effect of wall proximity on the collective dynamics of hydrodynamically coupled oscillators.
- To explore the transition between different collective motion patterns in a minimal ciliated surface model.
- To identify emergent behaviors, such as chimera states, in these systems.
Main Methods:
- Experimental realization of rotating oscillators above a no-slip plane.
- Numerical simulations of hydrodynamically coupled oscillators.
- Analysis of global dynamics and pattern formation as a function of oscillator-wall distance.
Main Results:
- Oscillator distance from the wall significantly alters hydrodynamic interaction range and global dynamics.
- The system transitions from traveling waves to steady chevron patterns or phase-defect punctuated patterns.
- Behavior reminiscent of chimera states is observed near the transition between these regimes.
Conclusions:
- Wall proximity is a critical parameter controlling collective dynamics in ciliated systems.
- The model system exhibits rich pattern transitions and emergent phenomena like chimera states.
- Understanding these dynamics is key to comprehending biological functions reliant on cilia and flagella.
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