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Dynamics and distribution of inclusions in fluid membranes

Speaker: Prof. Patricia Bassereau (Institut Curie, Paris, France)
Date: Wednesday 30 October 2019
Time: 15:00
Venue: Queens Buildings N/3.28

The membranes of cells are made for a large part of lipids assembled in bilayers. Membranes behave as 2D-liquid, but they also have peculiar mechanical properties since they can be bent in the perpendicular direction, as well as stretched. The Brownian motion of inclusions embedded into membranes, such as trans-membrane proteins is not trivial and has been well described by the long-time accepted Saffman-Delbrück model. However, rich behavior arises for inclusions with non-symmetric shapes, that locally bend membranes. Coupling between inclusions' distribution and density can be observed as well as deviation to inclusion mobility described by Saffman-Delbrück. I will illustrate with some examples these peculiar properties specific to fluid membranes, and discuss some consequences for living cells.