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Related Concept Videos

Asymmetric Lipid Bilayer01:35

Asymmetric Lipid Bilayer

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%...
What are Lipids?01:38

What are Lipids?

Overview
What are Lipids?01:31

What are Lipids?

Lipids function as structural components of cellular membranes, in addition to acting as energy reservoirs and signaling molecules. They are thus crucial to all living organisms.  The three biologically important classes of lipids are triglycerides, phospholipids, and steroids.
Non-Polar and Hydrophobic Characteristics of Lipids
Lipids are a structurally and functionally diverse group of hydrocarbons—compounds consisting of carbon and hydrogen atoms. The carbon-carbon and carbon-hydrogen bonds...
Membrane Lipids01:32

Membrane Lipids

Lipids are an essential component of all biological membranes. The average lipid content in mammalian membranes is 50%, though it can be as low as 20% in the inner mitochondrial membrane or as high as 80% in the myelin sheath present around the nerve cells.
Phosphatidylcholine, phosphatidylethanolamine, phosphatidylserine, and sphingomyelin are the most common phospholipids present in mammalian membranes. At physiological pH, phosphatidylserine is negatively charged, while the other three...
Membrane Lipids01:32

Membrane Lipids

Lipids are an essential component of all biological membranes. The average lipid content in mammalian membranes is 50%, though it can be as low as 20% in the inner mitochondrial membrane or as high as 80% in the myelin sheath present around the nerve cells.
Phosphatidylcholine, phosphatidylethanolamine, phosphatidylserine, and sphingomyelin are the most common phospholipids present in mammalian membranes. At physiological pH, phosphatidylserine is negatively charged, while the other three...
Membrane Fluidity01:26

Membrane Fluidity

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 a relatively...

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Related Experiment Video

Updated: May 30, 2026

Neutron Spin Echo Spectroscopy as a Unique Probe for Lipid Membrane Dynamics and Membrane-Protein Interactions
10:02

Neutron Spin Echo Spectroscopy as a Unique Probe for Lipid Membrane Dynamics and Membrane-Protein Interactions

Published on: May 27, 2021

Aqueous solutions at the interface with phospholipid bilayers.

Max L Berkowitz1, Robert Vácha

  • 1Department of Chemistry, University of North Carolina at Chapel Hill, 27599, United States. maxb@unc.edu

Accounts of Chemical Research
|July 21, 2011
PubMed
Summary
This summary is machine-generated.

Understanding water and ion interactions at biological membrane interfaces is crucial. New research clarifies hydration forces and ion effects, advancing biomembrane science.

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Temperature-Controlled Assembly and Characterization of a Droplet Interface Bilayer
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Assembly of Cell Mimicking Supported and Suspended Lipid Bilayer Models for the Study of Molecular Interactions

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Related Experiment Videos

Last Updated: May 30, 2026

Neutron Spin Echo Spectroscopy as a Unique Probe for Lipid Membrane Dynamics and Membrane-Protein Interactions
10:02

Neutron Spin Echo Spectroscopy as a Unique Probe for Lipid Membrane Dynamics and Membrane-Protein Interactions

Published on: May 27, 2021

Temperature-Controlled Assembly and Characterization of a Droplet Interface Bilayer
10:11

Temperature-Controlled Assembly and Characterization of a Droplet Interface Bilayer

Published on: April 19, 2021

Assembly of Cell Mimicking Supported and Suspended Lipid Bilayer Models for the Study of Molecular Interactions
12:18

Assembly of Cell Mimicking Supported and Suspended Lipid Bilayer Models for the Study of Molecular Interactions

Published on: August 3, 2021

Area of Science:

  • Biophysics
  • Physical Chemistry
  • Materials Science

Background:

  • Biological membranes define cellular boundaries and regulate internal processes.
  • Water and ionic solutions significantly influence membrane properties and vice versa.
  • Molecular-level understanding of aqueous interfaces is critical for biological research.

Purpose of the Study:

  • To elucidate the interactions between pure water, ionic solutions, and model membranes.
  • To detail advancements in understanding hydration forces and ion-specific effects at membrane interfaces.
  • To highlight the synergy between experimental and computational approaches in biomembrane studies.

Main Methods:

  • Experimental investigations of water and ionic solution interactions with phospholipid bilayers.
  • Computational modeling to describe molecular-level phenomena at membrane interfaces.
  • Theoretical analysis integrating experimental and simulation data.

Main Results:

  • Identified a repulsion force due to water removal between membrane surfaces.
  • Characterized the structural properties and dynamics of interfacial water.
  • Advanced understanding of ion-specific effects and their link to the Hofmeister series.

Conclusions:

  • A combined experimental and computational approach has significantly improved understanding of membrane-water-ion interactions.
  • Key forces and molecular behaviors at biomembrane interfaces are now better understood.
  • Further research is needed to resolve complex interactions, such as those involving NaI solutions.