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Electrical synapses found in all nervous systems play important and unique roles. In these synapses, the presynaptic and postsynaptic membranes are very close together (3.5 nm) and are actually physically connected by channel proteins forming gap junctions.
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Related Experiment Video

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Measuring the Induced Membrane Voltage with Di-8-ANEPPS
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Electrical noise from synthetic membranes.

L J Defelice1, J P Michalides

  • 1Department of Physiology, University of Leyden, The Netherlands.

The Journal of Membrane Biology
|November 2, 2013
PubMed
Summary

This study investigated voltage fluctuations in collodion membranes under electrical potential. Noise power was found to be proportional to dissipated power and inversely related to frequency, linked to ion-membrane interactions.

Area of Science:

  • Physical Chemistry
  • Membrane Science
  • Electrochemistry

Background:

  • Collodion membranes act as barriers between aqueous salt solutions.
  • Applied electrical potential differences drive ion transport across membranes.
  • Understanding voltage fluctuations (noise) is crucial for characterizing membrane properties.

Purpose of the Study:

  • To measure and analyze voltage fluctuations across collodion membranes.
  • To investigate the relationship between noise power, dissipated power, and frequency.
  • To explore the role of ion-membrane frictional interactions.

Main Methods:

  • Measurements of voltage fluctuations across collodion membranes.
  • Application of a direct current (d-c) electrical potential difference.

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  • Characterization of membrane d-c resistance and steady-state currents.
  • Noise power spectral density analysis in the 8–5,000 Hz range.

    • Main Results:

    • Excess noise power spectral density was proportional to mean dissipated power.
    • Excess noise power spectral density was inversely proportional to frequency.
    • Observed phenomena were discussed in relation to ion-membrane frictional interactions.

    Conclusions:

    • The study quantifies excess noise in collodion membranes.
    • Ion-membrane frictional interactions significantly influence electrical properties and noise.
    • Findings contribute to understanding transport phenomena in constrained systems.