Dynamics and instabilities in growing fluid membranes

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• Jordan Shivers (University of Chicago)
• Friday 24 November 2023, 15:00-16:00
• Seminar Room 2, Newton Institute.

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SPL - New statistical physics in living matter: non equilibrium states under adaptive control

The growth of lipid membranes plays a crucial role in many cellular processes, including the formation and spatial organization of vital cellular organelles. These processes often involve a delicate interplay of material exchange, shape dynamics, in-plane viscous flow, and apparent changes in material properties, and understanding how they are controlled remains an ongoing challenge. As a step in this direction, we consider a minimal fluid vesicle model in which growth is driven by coupling to a material reservoir. In simulations, we find that sufficiently strong nonequilibrium driving produces a striking morphological instability marked by out-of-plane buckling and dramatic changes in growth rate. We then discuss how the driving strength is quantitatively related to the growth rate, size fluctuations, and effective surface tension, using a combination of approaches from linear irreversible and stochastic thermodynamics. Our results suggest a multifaceted approach for understanding and constraining the effects of active driving forces on the mechanics and morphology of biological matter.

This talk is part of the Isaac Newton Institute Seminar Series series.

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