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Hydro-osmotic Instabilities in Active Membrane Tubes
Sami C Al-Izzi1,2,3,4, George Rowlands2, Pierre Sens3,4
1Department of Mathematics, University of Warwick, Coventry CV4 7AL, United Kingdom.
Abstract:
We study a membrane tube with unidirectional ion pumps driving an osmotic pressure difference. A pressure-driven peristaltic instability is identified, qualitatively distinct from similar tension-driven Rayleigh-type instabilities on membrane tubes. We discuss how this instability could be related to the function and biogenesis of membrane bound organelles, in particular, the contractile vacuole complex. The unusually long natural wavelength of this instability is in agreement with that observed in cells.
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