| Issue |
EPL
Volume 96, Number 2, October 2011
|
|
|---|---|---|
| Article Number | 28002 | |
| Number of page(s) | 6 | |
| Section | Interdisciplinary Physics and Related Areas of Science and Technology | |
| DOI | https://doi.org/10.1209/0295-5075/96/28002 | |
| Published online | 28 September 2011 | |
Ion pump activity generates fluctuating electrostatic forces in biomembranes
MEMPHYS - Center for Biomembrane Physics, Department of Physics and Chemistry, University of Southern Denmark - Campusvej 55, 5230 Odense M, Denmark, EU
Received:
26
May
2011
Accepted:
28
August
2011
We study the non-equilibrium dynamics of lipid membranes with proteins that actively pump ions across the membrane. We find that the activity leads to a fluctuating force distribution due to electrostatic interactions arising from the variation in the dielectric constant across the membrane. By applying a multipole expansion we find effects on both the tension and bending rigidity dominated parts of the membranes fluctuation spectrum. We discuss how our model compares with previous studies of force-multipole models.
PACS: 87.16.dp – Transport, including channels, pores, and lateral diffusion / 41.20.-q – Applied classical electromagnetism / 05.70.Np – Interface and surface thermodynamics
© EPLA, 2011
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