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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%...
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...
Membrane Fluidity01:23

Membrane Fluidity

Cell membranes are composed of phospholipids, proteins, and carbohydrates loosely attached to one another through chemical interactions. Molecules are generally able to move about in the plane of the membrane, giving the membrane its flexible nature called fluidity. Two other features of the membrane contribute to membrane fluidity: the chemical structure of the phospholipids and the presence of cholesterol in the membrane.Fatty acids tails of phospholipids can be either saturated or...
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 Domains01:18

Membrane Domains

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 anterior...

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Related Experiment Video

Updated: Jun 20, 2026

Realistic Membrane Modeling Using Complex Lipid Mixtures in Simulation Studies
07:31

Realistic Membrane Modeling Using Complex Lipid Mixtures in Simulation Studies

Published on: September 1, 2023

Collective lipid dynamics in biomembranes.

Michael F Brown1

  • 1Department of Chemistry and Biochemistry, University of Arizona, Tucson, AZ, 85721, USA; Department of Physics, University of Arizona, Tucson, AZ, 85721, USA; Program in Applied Mathematics, University of Arizona, Tucson, AZ, 85721, USA.

Biochimica Et Biophysica Acta. Biomembranes
|June 18, 2026
PubMed
Summary
This summary is machine-generated.

Nuclear Magnetic Resonance (NMR) spectroscopy reveals how lipid membrane structure and dynamics influence function. This review explores NMR

Keywords:
Bending elasticityCholesterolCurvatureFluidityLipidomicsMolecular dynamicsX-ray & neutron scattering

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

Published on: May 27, 2021

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Last Updated: Jun 20, 2026

Realistic Membrane Modeling Using Complex Lipid Mixtures in Simulation Studies
07:31

Realistic Membrane Modeling Using Complex Lipid Mixtures in Simulation Studies

Published on: September 1, 2023

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

Area of Science:

  • Biomolecular self-organization and membrane biophysics.

Background:

  • Cellular lipids exhibit complex structures and dynamics crucial for their functions.
  • Understanding the relationship between lipid molecular properties and membrane behavior is essential.

Purpose of the Study:

  • To review the development and application of Nuclear Magnetic Resonance (NMR) spectroscopy in studying lipid membranes.
  • To explore how NMR, combined with scattering techniques, bridges the gap between molecular structure, dynamics, and function.
  • To explain the behavior of lipid bilayers under different conditions, such as the presence of cholesterol or surfactants.

Main Methods:

  • Nuclear Magnetic Resonance (NMR) spectroscopy.
  • X-ray and neutron scattering techniques.
  • Analysis of orientational order parameters and relaxation rates.
  • Application of a model-free power-law to describe dynamics.

Main Results:

  • NMR observables, like order parameters and relaxation rates, are affected differently by cholesterol (liquid-ordered membranes) and surfactants (liquid-disordered membranes).
  • A unified power-law scaling explains bilayer fluidity and collective modes, linking atomistic interactions to mesoscale membrane properties.
  • NMR provides insights into membrane phase transitions, curvature, and protein-lipid interactions.

Conclusions:

  • NMR spectroscopy is a powerful tool for elucidating the intricate relationship between lipid membrane structure, dynamics, and function.
  • The findings contribute to understanding fundamental membrane properties and their implications in biological systems.