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Related Concept Videos

Facilitated Transport01:19

Facilitated Transport

127.2K
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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Facilitated Diffusion01:16

Facilitated Diffusion

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The plasma membrane, a critical structure in cellular biology, houses an array of transporters, or carrier proteins, interspersed within its lipid bilayer. These proteins play a crucial role in solute transport through facilitated diffusion, a form of passive diffusion that uses transporters to move the molecules across the membrane.
In this process, substrates such as organic compounds and ions interact with a transporter on one side, triggering conformational changes in proteins that enable...
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Pore Transport and Ion-Pair Transport01:17

Pore Transport and Ion-Pair Transport

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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...
477
Diffusion01:12

Diffusion

192.9K
Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...
192.9K
Passive Diffusion: Overview and Kinetics01:17

Passive Diffusion: Overview and Kinetics

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Passive diffusion is a critical process that allows small lipophilic drugs to cross the cell membrane along a concentration gradient. This mechanism's efficiency depends on four primary factors: the membrane's surface area, the drug's lipid-water partition coefficient, the concentration gradient, and the membrane's thickness.
When administered orally, drugs establish a substantial concentration gradient between the gastrointestinal (GI) lumen and the bloodstream, expediting...
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Protein Diffusion in the Membrane01:24

Protein Diffusion in the Membrane

4.4K
Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...
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Related Experiment Video

Updated: Jul 11, 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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Surface diffusion enhanced ion transport through two-dimensional nanochannels.

Yu Jiang1, Rong Hu1, Chongyang Yang1

  • 1State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, P. R. China.

Science Advances
|November 3, 2023
PubMed
Summary
This summary is machine-generated.

Ion transport in nanofluidic channels is significantly faster than in bulk solutions. This enhanced ion permeation is due to dense cation packing and in-plane diffusion at mica surfaces within the nanochannels.

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Area of Science:

  • Nanotechnology
  • Physical Chemistry
  • Materials Science

Background:

  • Nanofluidic channels are crucial for separation technologies and energy harvesting.
  • Understanding ion transport mechanisms in nanoscale environments is essential but challenging.

Purpose of the Study:

  • To investigate ion transport mechanisms in controllably fabricated nanochannels.
  • To explore the influence of distinct surface properties on ion permeation.

Main Methods:

  • Fabrication of two-dimensional nanochannels using atomically flat graphite and mica crystals.
  • Analysis of ion interactions with channel surfaces.

Main Results:

  • Observed ion transport orders of magnitude faster than in bulk solutions.
  • Attributed enhanced transport to dense cation packing and in-plane diffusion at mica surfaces.

Conclusions:

  • Surface effects significantly enhance ion transport at the nanoscale.
  • Provides fundamental insights into ion behavior in confined environments.