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Related Concept Videos

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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.
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When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
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Consider an external electric field propagating through a homogeneous medium. When the electric field crosses the surface boundary of the medium, it undergoes a discontinuity. The electric field can be resolved into normal and tangential components. The amount by which the field changes at any boundary is given by the difference between the field components above and below the surface boundary.
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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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Different physical properties of lipids and proteins allow them to localize and form distinct islands or domains in the membrane. Some membrane domains are formed due to protein-protein interactions, whereas others are formed due to the presence of specific lipids such as sphingolipids and sterols—for example, large proteins, such as bacteriorhodopsin, aggregate and create distinct domains.
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Out-of-plane deformability and its coupling with electrostatics in biomembranes.

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Cell membranes exhibit flexoelectricity, where mechanical bending induces electrical polarization and electric fields cause mechanical deformation. This property is crucial for understanding cell membrane behavior and is influenced by membrane asymmetry.

Keywords:
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Area of Science:

  • Biophysics
  • Soft Matter Physics
  • Cell Biology

Background:

  • Cell membranes are soft, quasi-bidimensional systems composed of ordered multipoles.
  • These membranes exhibit electrical polarization in response to electric fields and mechanical deformation.
  • Flexoelectricity describes the coupling between mechanical deformation and electrical polarization in membranes.

Purpose of the Study:

  • To describe flexoelectricity in lipid bilayers and cell membranes.
  • To summarize existing research on membrane flexoelectricity.
  • To emphasize the role of membrane asymmetry in flexoelectric effects.

Main Methods:

  • Review of existing literature on membrane flexoelectricity.
  • Analysis of electromechanical coupling in lipid bilayers and cell membranes.
  • Focus on strain gradient-induced polarization and electric field gradient-induced bending stress.

Main Results:

  • Membrane bending causes strain gradient-induced polarization.
  • External electric field gradients induce mechanical bending stress.
  • Membrane asymmetry significantly affects flexoelectric phenomena.

Conclusions:

  • Flexoelectricity is a key property governing the electromechanical behavior of cell membranes.
  • Understanding flexoelectricity is essential for cell membrane biophysics.
  • Membrane asymmetry plays a critical role in modulating flexoelectric responses.