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Gravity effects on membrane processes.

A Schatz1, R Reitstetter, A Linke-Hommes

  • 1DLR, Institute for Aerospace Medicine, Cologne, Germany.

Advances in Space Research : the Official Journal of the Committee on Space Research (COSPAR)
|January 1, 1994
PubMed
Summary
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Gravity affects membrane transport. Gouy-Chapman-Debye-Hückel (GCDH) theory predicts density changes, leading to gravity-induced convection and potential variations. Experiments confirm these effects on gramicidin channels in artificial membranes.

Area of Science:

  • Biophysics
  • Physical Chemistry
  • Membrane Science

Background:

  • The Gouy-Chapman-Debye-Hückel (GCDH) theory describes the electrical double layer at interfaces.
  • Cellular dimensions may allow hydrodynamic effects to influence membrane-bound processes.
  • Gravity's influence on biological systems, particularly at the membrane level, is not fully understood.

Purpose of the Study:

  • To theoretically investigate gravity's effects on interfacial layers of model membranes.
  • To explore how gravity influences transport across membranes and their associated layers.
  • To experimentally validate theoretical predictions regarding gravity-induced changes in membrane function.

Main Methods:

  • Application of Gouy-Chapman-Debye-Hückel (GCDH) theory to model membrane-electrolyte systems.
Keywords:
NASA Discipline Cell BiologyNASA Discipline Number 40-99NASA Program Space Biology Research AssociatesNon-NASA Center

Related Experiment Videos

  • Hydrodynamic analysis of interfacial layers at cellular dimensions.
  • Experimental incorporation of gramicidin channels into artificial phosphatidylserine bilayer membranes.

    • Main Results:

    • Theoretical prediction of density variations and gravity-induced effects (convection, surface potential changes).
    • Experimental observation of significant differences in single channel currents for gramicidin in vertical vs. horizontal membranes.
    • Demonstration of gravisensitivity in membrane transport processes.

    Conclusions:

    • Gravity can induce measurable effects on membrane interfacial layers and transport.
    • Experimental results align with theoretical predictions of gravity's influence on membrane function.
    • Further investigation of gravisensitivity in isolated membrane systems is crucial for understanding biological complexity.