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The Resting Membrane Potential01:21

The Resting Membrane Potential

Overview
Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at the...
Resting Membrane Potential01:24

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The relative difference in electrical charge, or voltage, between the inside and the outside of a cell membrane, is called the membrane potential. It is generated by differences in permeability of the membrane to various ions and the concentrations of these ions across the membrane.
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Resting Membrane Potential01:24

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Enzymes like flippase, floppase, and scramblase transfer phospholipids from one layer to another in the membrane, thereby affecting membrane asymmetry.
Flippase
Eukaryotic flippases are type-IV P-type ATPases or P4-ATPases belonging to P-type ATPase family proteins that are membrane-bound pumps involved in the ATP-mediated transport of ions and molecules across the membrane. Flippases flip specific phospholipids from the outer to the inner leaflet of a membrane. All P4-ATPases have one...
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Fluid Mosaic Model

Scientists identified the plasma membrane in the 1890s and its principal chemical components (lipids and proteins) by 1915. The model for plasma membrane structure, proposed in 1935 by Hugh Davson and James Danielli, was the first model to be widely accepted in the scientific community. The model was based on the plasma membrane's "railroad track" appearance in early electron micrographs. Davson and Danielli theorized that the plasma membrane's structure resembled a sandwich with the analogy of...

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Realistic Membrane Modeling Using Complex Lipid Mixtures in Simulation Studies
07:31

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Modeling membranes under a transmembrane potential.

Lucie Delemotte, François Dehez, Werner Treptow

    The Journal of Physical Chemistry. B
    |April 17, 2008
    PubMed
    Summary

    A new method models ion transport through synthetic and biological channels under realistic conditions. This approach uses molecular dynamics simulations to efficiently generate ionic currents and estimate channel conductance.

    Area of Science:

    • Biophysics
    • Computational Biology
    • Materials Science

    Background:

    • Modeling ion transport across transmembrane channels is complex.
    • Existing methods struggle with realistic biological conditions.

    Discussion:

    • Introduces a novel computational method for simulating ion transport.
    • Employs molecular dynamics simulations of peptide nanotube channels in lipid bilayers.
    • Applies transmembrane potentials from asymmetric ion distributions.

    Key Insights:

    • The method efficiently generates realistic ionic currents.
    • Enables estimation of intrinsic channel conductance.
    • Validates the simulation approach for biological systems.

    Outlook:

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    • Potential for designing novel synthetic ion channels.
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    • Applications in drug delivery and biosensing.