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Related Concept Videos

Mechanisms of Membrane-bending01:15

Mechanisms of Membrane-bending

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The living membranes are flexible due to their fluid mosaic nature; however, their bending into different shapes is an active process regulated by specific lipids and proteins. The membrane bending can be transient as seen in vesicles or stable for a long time as in microvilli. Cells regulate the size, location, and duration of the membrane curvature.
Membrane bending can happen due to intrinsic changes in lipid composition or extrinsic association with different proteins. The proteins involved...
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Asymmetric Lipid Bilayer01:35

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Biological membranes show uneven distribution of different types of lipids in the inner and outer layers, resulting in transverse asymmetric membranes. The treatment of the erythrocyte membrane with the enzyme phospholipase confirmed the asymmetric nature of the lipid bilayer. The enzyme hydrolyzes lipids into fatty acids and hydrophilic groups. The phospholipase acts only on the outer layer of the membrane, while the inner layer remains intact. The phospholipase treatment resulted in 80%...
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Membrane Fluidity01:26

Membrane Fluidity

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Membrane fluidity is explained by the fluid mosaic model of the cell membrane, which describes the plasma membrane structure as a mosaic of components—including phospholipids, cholesterol, proteins, and carbohydrates—that gives the membrane a fluid character.
Mosaic nature of the membrane
The mosaic characteristic of the membrane helps the plasma membrane remain fluid. The integral proteins and lipids exist as separate but loosely-attached molecules in the membrane. The membrane is...
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Membrane Domains01:18

Membrane Domains

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The membrane domains concentrate specific lipids and proteins at one place within the membrane, which helps in cell signaling, adhesion, and other critical cellular processes. These domains can differ in size, composition, function, and lifespan.
Protein Domains
The membrane comprises a group of distinct proteins responsible for carrying out a cell's specific function. For example, the plasma membrane of the human sperm, or a single germ cell, contains a unique set of proteins in the...
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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:
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Patch Clamp01:18

Patch Clamp

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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.
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Updated: Jun 14, 2025

Membrane Remodeling of Giant Vesicles in Response to Localized Calcium Ion Gradients
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Membrane Remodeling of Giant Vesicles in Response to Localized Calcium Ion Gradients

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Precise control of transmembrane current via regulating bionic lipid membrane composition.

Zhiwei Shang1, Jing Zhao1, Mengyu Yang1

  • 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 430074, China.

Science Advances
|August 30, 2024
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Summary
This summary is machine-generated.

This study introduces a biomimetic nanochannel system using DNA nanotechnology and graphene oxide to control ion transport. The programmable DNA scaffold networks allow tunable ion currents for applications in biosensing and environmental protection.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Biophysics

Background:

  • Ion channel function is influenced by membrane composition.
  • Anionic lipids activate K+ channels, inspiring biomimetic systems.

Purpose of the Study:

  • To develop a tunable biomimetic nanochannel system.
  • To control ion transport using DNA nanotechnology and graphene oxide.

Main Methods:

  • Assembling DNA scaffold networks (DSNs) on graphene oxide (GO) nanosheets.
  • Modulating DSN layers to control membrane composition.
  • Incorporating DNAzymes for reversible modulation.

Main Results:

  • DSN layers precisely controlled membrane composition.
  • Ion current was enhanced up to 12-fold due to charge effects.
  • DNAzymes enabled cyclic conversion of ion current.

Conclusions:

  • The DNA-GO system offers efficient and tunable ion transport.
  • Potential applications include mass transport, environmental protection, and biosensors.