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• W1979792013 abstract "Many cellular and intracellular processes critically depend on membrane shape, but the shape generating mechanisms are still to be fully understood. In this study we evaluate how electrostatic/electrokinetic forces contribute to membrane curvature. Membrane bilayer had finite thickness and was either elastically anisotropic or anisotropic overall, but isotropic per sections (heads and tails). The physics of the situation was evaluated using a coupled system of elastic and electrostatic/electrokinetic (Poisson–Nernst–Planck) equations. The fixed charges present only on the upper membrane surface lead to the accumulation of counter-ions and depletion of co-ions that decay spatially very rapidly (Debye length < 1 nm), as does the potential and electric field. Spatially uneven electric field and the permittivity mismatch also induce charges at the membrane–solution interface, which are not fixed but influence the electrostatics nevertheless. Membrane bends due to — Coulomb force (caused by fixed membrane charges in the electric field) and the dielectric force (due to the non-uniform electric field and the permittivity mismatch between the membrane and the solution). Both act as membrane surface forces, and both depend supra-linearly on the fixed charge density. Regardless of sign of the fixed charges, the membrane bends toward the charged (upper) surface owing to the action of the Coulomb force, but this is opposed by the smaller dielectric force. The spontaneous membrane curvature becomes very pronounced at high fixed charge densities, leading to very small spontaneous radii (< 50 nm). In conclusion the electrostatic/electrokinetic forces contribute significantly to the membrane curvature." @default.
• W1979792013 created "2016-06-24" @default.
• W1979792013 creator A5044456642 @default.
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• W1979792013 date "2012-03-01" @default.
• W1979792013 modified "2023-09-27" @default.
• W1979792013 title "Elastic, electrostatic and electrokinetic forces influencing membrane curvature" @default.
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• W1979792013 doi "https://doi.org/10.1016/j.bbamem.2011.10.017" @default.
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