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The living membranes are flexible due to their fluid mosaic nature; however, their bending into different shapes is an active process regulated by specific lipids and proteins. The membrane bending can be transient as seen in vesicles or stable for a long time as in microvilli. Cells regulate the size, location, and duration of the membrane curvature.
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Nanoscale surface relaxation of a membrane stack.

Hamutal Bary-Soroker¹, Haim Diamant

¹School of Physics & Astronomy, Raymond & Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 69978, Israel.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|November 13, 2007

Summary

Researchers identified a slow relaxation in lipid membrane stacks, attributing it to an overdamped capillary mode. This finding allows for the extraction of dynamic surface tension from membrane stack measurements.

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Area of Science:

Biophysics
Soft Matter Physics

Background:

Lipid membrane stacks exhibit short-wavelength fluctuations.
Two distinct relaxation processes have been observed in these fluctuations.
A fast relaxation is attributed to the baroclinic mode, but a slower relaxation remains unexplained.

Purpose of the Study:

To identify the origin of the slower relaxation observed in lipid membrane stack fluctuations.
To demonstrate a method for extracting dynamic surface tension from membrane stack measurements.

Main Methods:

Analysis of short-wavelength fluctuations in lipid membrane stacks.
Theoretical modeling to explain observed relaxation dynamics.

Main Results:

A slow relaxation (approximately 1-10 micros(-1)) was identified and attributed to an overdamped capillary mode.
The slow relaxation is dependent on the surface tension and anisotropic viscosity of the membrane stack.
The fast relaxation (approximately 0.1 ns(-1)) corresponds to the known baroclinic mode.

Conclusions:

The slower relaxation in lipid membrane stacks is explained by an overdamped capillary mode.
This study provides a method to determine the dynamic surface tension of membrane stacks.
Understanding these dynamics is crucial for soft matter and biophysics research.