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Related Concept Videos

Ion Channels01:19

Ion Channels

89.8K
The movement of ions like sodium, potassium, and calcium into and out of the cell is essential to maintain the electrochemical gradient in living cells. The ion channels—a class of membrane transport proteins—help maintain this ionic gradient for the smooth functioning of physiological activities such as maintaining cell size and volume, conducting nerve impulses, and gas and nutrient exchange.
Ion channels are specialized integral membrane proteins on the plasma membrane that allow...
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Electrochemical Gradient and Channel Proteins: An Overview01:21

Electrochemical Gradient and Channel Proteins: An Overview

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An electrochemical gradient is a fundamental concept in biology and chemistry. It regulates the movement of ions across cell membranes. This movement is influenced by two factors:
The electrical gradient: The electrical gradient across cell membranes refers to the difference in electric charge between the inside and outside of a cell.  This difference drives the movement of ions towards or away from the cells. For instance, if the inside of the cell is more negatively charged relative to...
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Non-gated Ion Channels01:24

Non-gated Ion Channels

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Ion channels are specialized proteins on the plasma membrane that allow charged ions to pass down their electrochemical gradient. Their main function is to maintain the membrane potential which is critical for cell viability. These channels are either gated or non-gated and can transport more than a thousand ions within milliseconds for the cellular event to occur.
Compared to the gated ion channels, the non-gated channels, also known as leakage or passive channels, have no gating mechanism....
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Mechanically-gated Ion Channels01:12

Mechanically-gated Ion Channels

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Mechanically-gated ion channels are proteins found in eukaryotic and prokaryotic cell membranes that open in response to mechanical stress. Tension, compression, swelling, and shear stress can alter the conformation of the protein, opening a transmembrane channel that allows the passage of ions for signal transmission. In eukaryotes, mechanically-gated channels are distributed in several regions like the neurons, lungs, skin, bladder, and heart, where they play critical roles in numerous...
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Pore Transport and Ion-Pair Transport01:17

Pore Transport and Ion-Pair Transport

888
Pore transport and ion-pair formation are critical mechanisms for the absorption and distribution of drugs in the body.
Pore transport, also known as convective transport, is a process where small molecules like urea, water, and sugars rapidly cross cell membranes as though there were channels or pores in the membrane. Although direct microscopic evidence is limited  but the concept of pores or channels is widely accepted based on physiological evidence. Despite the lack of direct...
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Facilitated Transport01:19

Facilitated Transport

16.5K
The chemical and physical properties of plasma membranes cause them to be selectively permeable. Since plasma membranes have both hydrophobic and hydrophilic regions, substances need to be able to transverse both regions. The hydrophobic area of membranes repels substances such as charged ions. Therefore, such substances need special membrane proteins to cross a membrane successfully. In  facilitated transport, also known as facilitated diffusion, molecules and ions travel across a...
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Related Experiment Video

Updated: Nov 14, 2025

Membrane Transport Processes Analyzed by a Highly Parallel Nanopore Chip System at Single Protein Resolution
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Membrane Transport Processes Analyzed by a Highly Parallel Nanopore Chip System at Single Protein Resolution

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Towards explicit regulating-ion-transport: nanochannels with only function-elements at outer-surface.

Qun Ma1, Yu Li1, Rongsheng Wang1

  • 1State Key Laboratory of Biogeology and Environmental Geology, Engineering Research Center of Nano-Geomaterials of Ministry of Education, Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan, P. R. China.

Nature Communications
|March 11, 2021
PubMed
Summary
This summary is machine-generated.

Function elements at the outer surface (FE_OS) of nanochannel systems independently regulate ion transport. This finding offers new possibilities for optimizing devices like biosensors and energy converters.

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Area of Science:

  • Nanotechnology
  • Electrochemistry
  • Physical Chemistry

Background:

  • Function elements (FE) are crucial for controlling ion transport in nanochannel systems.
  • Inner wall function elements (FE_IW) are traditionally studied, but their properties are often inferred from outer surface function elements (FE_OS), leading to potential inaccuracies.

Purpose of the Study:

  • To demonstrate that FE_OS can independently regulate ion transport in nanochannel systems, even without FE_IW.
  • To validate the role of FE_OS through numerical simulations and experimental data.
  • To explore the advantages of FE_OS in applications like osmotic energy conversion and biosensing.

Main Methods:

  • Numerical simulations using Poisson and Nernst-Planck (PNP) equations with experimentally measured FE_OS parameters.
  • Comparison of simulation results with experimental data to validate the model.

Main Results:

  • FE_OS independently regulate ion transport in nanochannel systems without FE_IW.
  • Simulations incorporating FE_OS parameters accurately predict experimental observations.
  • FE_OS enhance power density in osmotic energy conversion by increasing ionic selectivity without significantly altering internal resistance.
  • FE_OS accommodate larger probes or targets than the nanochannel diameter.

Conclusions:

  • FE_OS play a significant and explicit role in regulating ion transport.
  • Nanochannel systems utilizing only FE_OS offer a quantitative platform for studying transport phenomena in confined spaces.
  • This approach provides advantages for developing advanced nanochannel-based devices.