English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

Fluid membranes made out of lipid bilayers are the fundamental separationstructure in eukaryotic cells. Many physiological processes rely on dramaticshape and topological changes (e.g. fusion, fission) of fluid membrane systems.Fluidity is key to the versatility and constant reorganization of lipidbilayers. Here, we study the role of the membrane intrinsic viscosity, arisingfrom the friction of the lipid molecules as they rearrange to accommodate shapechanges, in the dynamics of morphological changes of fluid vesicles. Inparticular, we analyze the competition between the membrane viscosity and theviscosity of the bulk fluid surrounding the vesicle as the dominant dissipativemechanism. We consider the relaxation dynamics of fluid vesicles put in anout-of-equilibrium state, but conclusions can be drawn regarding the kineticsor power consumption in regulated shape changes in the cell. On the basis ofnumerical calculations, we find that the dynamics arising from the membraneviscosity are qualitatively different from the dynamics arising from the bulkviscosity. When these two dissipation mechanisms are put in competition, wefind that for small vesicles the membrane dissipation dominates, with arelaxation time that scales as the size of the vesicle to the power 2. Forlarge vesicles, the bulk dissipation dominates, and the exponent in therelaxation time vs. size relation is 3.

The role of membrane viscosity in the dynamics of fluid membranes