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Related Experiment Videos

Fluid membranes exchanging material with external reservoirs.

P Girard1, F Jülicher, J Prost

  • 1Physico-Chimie Curie, UMR CNRS-Institut Curie 168, 26 rue d'Ulm, F-75248, Paris Cedex 05, France. philippe.girard@curie.fr

The European Physical Journal. E, Soft Matter
|September 2, 2004
PubMed
Summary

This study models fluid bilayers exchanging material with their surroundings. We explore non-equilibrium states and shape instabilities driven by osmotic pressure differences.

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Area of Science:

  • Biophysics
  • Fluid dynamics
  • Soft matter physics

Background:

  • Fluid bilayers are fundamental to biological membranes.
  • Understanding their dynamics is crucial for cell biology and materials science.
  • Exchange with surrounding fluids introduces complexity to bilayer behavior.

Purpose of the Study:

  • To derive covariant equations of motion for a single-component fluid bilayer with material exchange.
  • To investigate the sources of noise in these dynamic equations.
  • To analyze non-equilibrium states and shape instabilities arising from osmotic pressure differences.

Main Methods:

  • Derivation of covariant equations of motion.
  • Inclusion of solvent permeation and lipid exchange terms.

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  • Analysis of noise sources within the derived equations.
  • Investigation of steady states and instability criteria.

    • Main Results:

    • Covariant equations of motion accounting for material exchange and solvent permeation were derived.
    • Sources of noise in the bilayer dynamics were identified and discussed.
    • A non-equilibrium state was established due to differing lipid concentrations.
    • Shape instabilities were found to occur at a critical osmotic-pressure difference.

    Conclusions:

    • The derived model provides a framework for understanding fluid bilayer dynamics with exchange.
    • Osmotic pressure is a key factor driving non-equilibrium phenomena and instabilities.
    • The study highlights the importance of considering material exchange and noise in bilayer systems.