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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 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.
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Related Experiment Video

Updated: May 2, 2026

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

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Rough-smooth-rough dynamic interface growth in supported lipid bilayers.

Piyush Verma1, Morgan D Mager1, N A Melosh1

  • 1Materials Science and Engineering, Stanford University, 476 Lomita Mall, Stanford, California 94305, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|March 4, 2014
PubMed
Summary
This summary is machine-generated.

Supported phospholipid bilayers exhibit a unique rough-smooth-rough interface transition on chromium oxide, driven by lipid bilayer elasticity and substrate interactions. This finding expands understanding of dynamic interface systems.

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Atomic Force Microscopy Imaging and Force Spectroscopy of Supported Lipid Bilayers
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Atomic Force Microscopy Imaging and Force Spectroscopy of Supported Lipid Bilayers

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Area of Science:

  • Biophysics
  • Materials Science
  • Surface Science

Background:

  • Supported phospholipid bilayers are crucial for understanding cell membrane behavior and developing biosensors.
  • Previous studies on supported membranes focused on monotonic roughening, lacking insight into complex interface dynamics.
  • Substrate-bilayer interactions and material viscoelasticity are known to influence membrane morphology.

Purpose of the Study:

  • To investigate the spreading behavior of supported phospholipid bilayers on different substrates.
  • To elucidate the role of lipid bilayer viscoelasticity and substrate interactions in membrane morphology.
  • To identify novel interface transitions and their underlying mechanisms.

Main Methods:

  • Utilizing fluorescence microscopy to observe and analyze the dynamic interface growth of supported phospholipid bilayers.
  • Employing surface characterization techniques to understand substrate properties.
  • Developing theoretical models, including modifications to the Edwards-Wilkinson equation, to explain observed phenomena.

Main Results:

  • A unique rough-smooth-rough (RSR) interface transition was observed on chromium oxide, distinct from monotonic roughening.
  • The RSR transition was characterized by a roughness exponent of 0.45 ± 0.04.
  • The observed transition was attributed to the elastic properties of the lipid bilayer under initial compression from surface interactions.

Conclusions:

  • Lipid bilayer elasticity significantly influences the interface dynamics of supported membranes.
  • The discovery of the RSR transition broadens the understanding of dynamic interface systems beyond monotonic roughening.
  • Viscoelastic properties of lipid bilayers are critical factors in supported membrane behavior and warrant further investigation.