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Related Concept Videos

Aquaporins01:25

Aquaporins

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Aquaporins or AQPs are a family of integral membrane proteins whose primary function is to transport water, while some called aquaglyceroporins also transport glycerol. In addition, aquaporins have also been suspected to be involved in transporting volatile substances, such as carbon dioxide and ammonia, across membranes. Such AQPs that act as gas channels are often highly expressed in cells involved in the gaseous exchange, such as red blood cells, epithelial cells, and pulmonary capillaries.
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Potentiometry: Membrane Electrodes01:15

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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...
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Scientists identified the plasma membrane in the 1890s and its principal chemical components (lipids and proteins) by 1915. The model for plasma membrane structure, proposed in 1935 by Hugh Davson and James Danielli, was the first model to be widely accepted in the scientific community. The model was based on the plasma membrane's "railroad track" appearance in early electron micrographs. Davson and Danielli theorized that the plasma membrane's structure resembled a sandwich...
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What are Membranes?01:54

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A key characteristic of life is the ability to separate the external environment from the internal space. To do this, cells have evolved semi-permeable membranes that regulate the passage of biological molecules. Additionally, the cell membrane defines a cell’s shape and interactions with the external environment. Eukaryotic cell membranes also serve to compartmentalize the internal space into organelles, including the endomembrane structures of the nucleus, endoplasmic reticulum and...
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Membrane Domains01:18

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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.
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Ion Channels01:19

Ion Channels

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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.
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Updated: Dec 1, 2025

Automated Lipid Bilayer Membrane Formation Using a Polydimethylsiloxane Thin Film
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Automated Lipid Bilayer Membrane Formation Using a Polydimethylsiloxane Thin Film

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Two-dimensional adaptive membranes with programmable water and ionic channels.

Daria V Andreeva1,2, Maxim Trushin1, Anna Nikitina1,3

  • 1Centre for Advanced 2D Materials, National University of Singapore, Singapore, Singapore.

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|November 10, 2020
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Summary
This summary is machine-generated.

Researchers created smart artificial membranes using graphene oxide and polyamine. These programmable membranes control water and ion flow, mimicking biological functions for advanced filtration applications.

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Related Experiment Videos

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Biomimetic Engineering

Background:

  • Cellular membranes are vital for selective transport and filtering.
  • Adaptive membranes that change permeability are crucial for biological functions and technology.
  • Artificial membranes often lack the dynamic regulation seen in nature.

Purpose of the Study:

  • To engineer artificial membranes with programmable permeability and selectivity.
  • To mimic biological adaptive filtering and transport functions.
  • To explore self-assembled heterostructures for controlled ion and water transport.

Main Methods:

  • Fabrication of two-dimensional self-assembled heterostructures.
  • Utilizing graphene oxide and polyamine macromolecules.
  • Formation of a network of ionic channels.

Main Results:

  • Demonstrated regulated permeability of water and monovalent ions.
  • Showcased tunable permeability via pH changes or specific ion presence.
  • Identified a regulation mechanism based on internal component-ion interactions.

Conclusions:

  • Developed artificial membranes with programmable, predetermined permeability and selectivity.
  • The membrane's properties are governed by component choice, conformation, and charging state.
  • This approach offers a novel pathway for designing advanced filtration systems.