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Related Concept Videos

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 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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Membrane Asymmetry Regulating Transporters

Enzymes like flippase, floppase, and scramblase transfer phospholipids from one layer to another in the membrane, thereby affecting membrane asymmetry.
Flippase
Eukaryotic flippases are type-IV P-type ATPases or P4-ATPases belonging to P-type ATPase family proteins that are membrane-bound pumps involved in the ATP-mediated transport of ions and molecules across the membrane. Flippases flip specific phospholipids from the outer to the inner leaflet of a membrane. All P4-ATPases have one...
Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

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 the...
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Electrochemical Systems

Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution, the Zn metal, composed...
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The Electrical Double Layer

In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...

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A Micro-agar Salt Bridge Electrode for Analyzing the Proton Turnover Rate of Recombinant Membrane Proteins
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Charge fluctuations on membrane surfaces in water

Menes1, Pincus, Stein

  • 1Materials Research Laboratory, University of California, Santa Barbara, California 93106, USA.

Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
|November 23, 2000
PubMed
Summary

We found that interactions between neutral surfaces are affected by dielectric properties, changing how they attract or repel. These findings are crucial for understanding charged lipid membranes in aqueous solutions.

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Area of Science:

  • Physical Chemistry
  • Surface Science
  • Biophysics

Background:

  • Interactions between neutral surfaces are often governed by charge fluctuations.
  • Dielectric discontinuities, common in biological systems like lipid membranes, significantly influence these interactions.
  • Previous models often simplified these complex dielectric environments.

Purpose of the Study:

  • To generalize predictions of attractions between neutral surfaces to systems with dielectric discontinuities.
  • To investigate the role of dielectric constants in membrane-water systems.
  • To determine conditions under which these interactions become repulsive.

Main Methods:

  • Generalizing theoretical predictions for surface interactions.
  • Analyzing systems with dielectric discontinuities, specifically mixed charged lipid membranes in aqueous solutions.
  • Evaluating the dependence of interactions on dielectric constants and distance.

Main Results:

  • Induced interactions depend non-trivially on the dielectric constants of the membrane and surrounding water.
  • Interaction scaling with distance varies based on these dielectric properties.
  • Specific dielectric conditions predict a sign change in interaction, leading to repulsion.

Conclusions:

  • The study provides a generalized framework for understanding surface interactions in complex dielectric environments.
  • Dielectric properties are critical determinants of attractive and repulsive forces between lipid membranes.
  • This work offers predictive power for designing or interpreting experiments involving charged membranes.