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Related Concept Videos

Protein Diffusion in the Membrane01:24

Protein Diffusion in the Membrane

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Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...
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Membrane Fluidity01:23

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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.
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Fluid Movement Between Compartments01:18

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The force applied by fluids against a surface, known as hydrostatic pressure, initiates the transfer of fluid among different compartments. Within our blood vessels, the blood's hydrostatic pressure is a result of the heart's pumping action. At the arteriolar end of capillaries, hydrostatic pressure (capillary blood pressure) exceeds the opposing colloid osmotic pressure created primarily by plasma proteins like albumin. This discrepancy in pressure propels plasma and nutrients from the...
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Facilitated Diffusion01:16

Facilitated Diffusion

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The plasma membrane, a critical structure in cellular biology, houses an array of transporters, or carrier proteins, interspersed within its lipid bilayer. These proteins play a crucial role in solute transport through facilitated diffusion, a form of passive diffusion that uses transporters to move the molecules across the membrane.
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Facilitated Transport01:19

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The chemical and physical properties of plasma membranes cause them to be selectively permeable. Since plasma membranes have both hydrophobic and hydrophilic regions, substances need to be able to transverse both regions. The hydrophobic area of membranes repels substances such as charged ions. Therefore, such substances need special membrane proteins to cross a membrane successfully. In  facilitated transport, also known as facilitated diffusion, molecules and ions travel across a...
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The Significance of Membrane Transport01:44

The Significance of Membrane Transport

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The transport of solutes across the cell membrane is essential for metabolic processes, like maintaining cell size and volume, generating the action potential, exchanging nutrients and gases, etc. Membrane transport can be either passive or active. It can be simple diffusion, facilitated, or mediated transport aided by transport proteins such as transporters and channels.
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Related Experiment Video

Updated: Jun 14, 2025

Spot Variation Fluorescence Correlation Spectroscopy for Analysis of Molecular Diffusion at the Plasma Membrane of Living Cells
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Spot Variation Fluorescence Correlation Spectroscopy for Analysis of Molecular Diffusion at the Plasma Membrane of Living Cells

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Self-diffusion is temperature independent on active membranes.

Saurav G Varma1, Argha Mitra1, Sumantra Sarkar1

  • 1Center for Condensed Matter Theory, Department of Physics, Indian Institute of Science, Bengaluru, Karnataka, 560012, India. sauravvarma@iisc.ac.in.

Physical Chemistry Chemical Physics : PCCP
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Summary
This summary is machine-generated.

Active transport from the cytoskeleton makes molecular diffusion on cell membranes robust to temperature changes. This ensures precise cell signaling despite environmental temperature fluctuations, unlike current models.

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Fluorescence Recovery after Merging a Droplet to Measure the Two-dimensional Diffusion of a Phospholipid Monolayer
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Area of Science:

  • Cell Biology
  • Biophysics
  • Computational Biology

Background:

  • Molecular transport, including lipid and protein diffusion, is crucial for cell membrane dynamics and functions like cell signaling.
  • Temperature fluctuations in the cellular environment disrupt molecular transport, challenging cellular homeostasis.
  • Maintaining precise cellular functions in noisy, temperature-varying conditions is a significant biological challenge.

Purpose of the Study:

  • To investigate how active transport influences molecular self-diffusion on cell membranes in response to temperature variations.
  • To determine if active transport can confer robustness to temperature fluctuations, thereby maintaining cellular signaling precision.
  • To evaluate and improve existing models of molecular transport on lattices.

Main Methods:

  • Utilized both molecular and lattice-based modeling approaches to simulate membrane transport.
  • Developed and tested a new algorithm for modeling lipid self-diffusion on lattices.
  • Compared simulation results with experimental observations.

Main Results:

  • Active transport, originating from the cell's cytoskeleton, was shown to make molecular self-diffusion on membranes robust to temperature changes.
  • This temperature-independence of self-diffusion maintains the precision of cellular signaling across a wide range of temperatures.
  • The widely used Kawasaki algorithm was found to inaccurately predict the temperature dependence of lipid self-diffusion in equilibrium.

Conclusions:

  • Active transport provides a mechanism for cells to maintain stable signaling despite environmental temperature fluctuations.
  • The proposed new algorithm accurately captures equilibrium properties of lipid self-diffusion, aligning with experimental data.
  • This research offers insights into cellular robustness and improves computational models for membrane transport.