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Related Concept Videos

Patch Clamp01:18

Patch Clamp

Many fundamental cell functions such as muscle contraction and nerve transmission rely on the electrical signals produced by the movement of positively and negatively charged ions across the cell membrane. One competent method to record current flowing across the whole cell or single ion channel is the patch-clamp technique.
In this method, a glass micropipette containing electrolyte solution is tightly sealed against a small portion of the cell membrane. As a result, a patch of the cell...
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...
Junction Potentials in Galvanic Cells01:21

Junction Potentials in Galvanic Cells

The Nernst equation, derived under the assumption of thermodynamic equilibrium, calculates the electromotive force (emf) as the sum of potential differences at phase boundaries in a reversible cell without a liquid junction. However, in irreversible cells such as the Daniell cell, an additional potential difference named the liquid-junction potential (EJ) arises across the interface of two electrolyte solutions due to different ion diffusion rates. This EJ represents the potential difference...
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.
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Related Experiment Video

Updated: May 30, 2026

Patch-clamp Capacitance Measurements and Ca2+ Imaging at Single Nerve Terminals in Retinal Slices
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Measurement of the membrane potential in small cells using patch clamp methods.

James R Wilson1, Robert B Clark, Umberto Banderali

  • 1University of Calgary, AB, Canada.

Channels (Austin, Tex.)
|August 11, 2011
PubMed
Summary

Accurate measurement of resting membrane potential in small cells is challenging. A new mathematical model reveals how seal resistance and nonlinear potassium conductance affect readings, offering solutions for improved accuracy.

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Area of Science:

  • Biophysics
  • Cell Physiology
  • Mathematical Modeling

Background:

  • Resting membrane potential (E(m)) is crucial for cell function, but difficult to measure accurately in small cells using patch clamp.
  • Changes in E(m) affect cell excitability, contractility, and migration.

Purpose of the Study:

  • To develop a mathematical model for predicting E(m) in small cells.
  • To investigate the impact of seal resistance and potassium (K+) conductance on E(m) measurements.
  • To identify strategies for overcoming limitations in patch clamp recordings.

Main Methods:

  • Developed a biophysical mathematical model for small cells (e.g., neonatal cardiac myocytes).
  • Simulated E(m) under conditions of linear and nonlinear K+ conductance.
  • Analyzed the influence of seal resistance on E(m) readings.

Main Results:

  • Seal leakage current depolarizes E(m) with linear K+ conductance; accurate measurements require seal resistance ≥ 5x input resistance.
  • Nonlinear, inwardly rectifying K+ conductance can lead to bistable E(m) values in small cells.
  • Bistable behavior is observed in various small mammalian cell types.

Conclusions:

  • The model provides mechanistic insights into E(m) measurement challenges in small cells.
  • Practical methods are suggested to minimize limitations and improve the accuracy of E(m) determination.
  • Understanding these biophysical principles is key for reliable electrophysiological studies.