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Related Concept Videos

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.
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The transport of solutes across the cell membrane is essential for metabolic processes, like maintaining cell size and volume, generating the action potential, exchanging nutrients and gases, etc. Membrane transport can be either passive or active. It can be simple diffusion, facilitated, or mediated transport aided by transport proteins such as transporters and channels.
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Pore transport and ion-pair formation are critical mechanisms for the absorption and distribution of drugs in the body.
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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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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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Membrane Transport Processes Analyzed by a Highly Parallel Nanopore Chip System at Single Protein Resolution
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Ion transport controlled by nanoparticle-functionalized membranes.

Edward Barry1, Sean P McBride2, Heinrich M Jaeger3

  • 1Center for Nanoscale Materials, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, USA.

Nature Communications
|December 18, 2014
PubMed
Summary

Researchers developed a new method to control ion transport in membranes using ligand-coated nanoparticles. This technique tunes membrane charge density and ion selectivity for advanced porous materials.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Physical Chemistry

Background:

  • Control of ionic interactions in confined geometries is crucial for porous materials like proton exchange membranes and biological ion channels.
  • Existing methods for tuning membrane properties are limited in flexibility and control.

Purpose of the Study:

  • To introduce a novel method for functionalizing membranes using ligand-coated nanoparticles to precisely control electrostatic interactions with ions.
  • To demonstrate the tunability of membrane charge density and ion transport by modifying nanoparticle ligands.

Main Methods:

  • Deposition of ligand-coated nanoparticles at the entrances of membrane pores.
  • Synthesis of nanoparticles with various terminal ligand groups (methyl, carboxyl, amine, sulfonate).
  • Systematic variation of pore diameter to study size-dependent effects.

Main Results:

  • Ligand terminal groups effectively tuned membrane charge density and controlled ion transport.
  • Sulfonate ligands enhanced membrane charge density by acting as binding sites.
  • The method was successfully applied to membranes with varying pore diameters.

Conclusions:

  • Nanoparticle functionalization of membranes using ligated nanoparticles offers a versatile and effective approach to control ion transport.
  • This method provides a new pathway for designing advanced porous materials with tailored ionic selectivity and transport properties.