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Related Concept Videos

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...
The Resting Membrane Potential01:21

The Resting Membrane Potential

Overview
Resting Membrane Potential01:24

Resting Membrane Potential

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.
The Inside of a Neuron is More Negative
The membrane potential of a cell can be measured by inserting a microelectrode into a cell and comparing the charge to a reference electrode in the extracellular fluid. The...
Resting Membrane Potential01:24

Resting Membrane Potential

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.
The Inside of a Neuron is More Negative
The membrane potential of a cell can be measured by inserting a microelectrode into a cell and comparing the charge to a reference electrode in the extracellular fluid. The...
Impedances and Admittance01:23

Impedances and Admittance

In the realm of AC circuits, passive circuit elements like resistors, inductors, and capacitors take on a different character when characterized by phasor voltage and current. Their behavior is expressed through impedance, a vital concept in AC circuit analysis.
Impedance is a measure of resistance to sinusoidal current flow in an AC circuit. Unlike their behavior in DC circuits, where inductors appear as short circuits and capacitors as open circuits, the behavior of these components in AC...
Half wave rectifier01:20

Half wave rectifier

A half-wave rectifier is a fundamental circuit in electronics, designed to convert alternating current (AC) voltage into a unidirectional voltage. It utilizes the simplest form of diode rectification, where the circuit comprises a single diode in series with a load resistor and an AC power source.

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Related Experiment Video

Updated: Jun 19, 2026

Assembly and Characterization of Biomolecular Memristors Consisting of Ion Channel-doped Lipid Membranes
08:07

Assembly and Characterization of Biomolecular Memristors Consisting of Ion Channel-doped Lipid Membranes

Published on: March 9, 2019

POTENTIAL, IMPEDANCE, AND RECTIFICATION IN MEMBRANES.

D E Goldman1

  • 1Department of Physiology, College of Physicians and Surgeons, Columbia University, New York.

The Journal of General Physiology
|October 30, 2009
PubMed
Summary
This summary is machine-generated.

Artificial membrane studies reveal rectification in asymmetrical systems, increasing with membrane potential. A theoretical model, particularly one assuming a constant electric field, shows good agreement with experimental data for artificial membranes and squid giant axons.

Related Experiment Videos

Last Updated: Jun 19, 2026

Assembly and Characterization of Biomolecular Memristors Consisting of Ion Channel-doped Lipid Membranes
08:07

Assembly and Characterization of Biomolecular Memristors Consisting of Ion Channel-doped Lipid Membranes

Published on: March 9, 2019

Area of Science:

  • Biophysics
  • Membrane Science

Background:

  • Artificial membranes are crucial models for understanding biological systems.
  • Ion transport across membranes is fundamental to cellular function.

Purpose of the Study:

  • To investigate impedance and potential changes in artificial membranes.
  • To develop and test theoretical models for ion transport and rectification in membranes.

Main Methods:

  • Impedance and potential measurements on artificial membranes.
  • Varying current and environmental solution composition.
  • Applying theoretical models based on kinetic equations for ion motion.

Main Results:

  • Rectification observed in asymmetrical membrane systems, correlating with membrane potential.
  • A theoretical model assuming a constant electric field provided better agreement with experimental data than microscopic electroneutrality.
  • Qualitative agreement with rectification and good agreement with membrane potential data for squid giant axon.

Conclusions:

  • The constant electric field model offers a viable framework for understanding membrane potential and rectification.
  • Further refinement of boundary conditions may improve theoretical model accuracy.
  • The findings have implications for understanding ion transport in biological systems like the squid giant axon.