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Related Concept Videos

Diffusion01:21

Diffusion

4.1K
Diffusion is a type of passive transport. In passive transport, a substance tends to move from an area of high concentration to an area of low concentration until the concentration is equal across the space. For example, take the diffusion of substances through the air. When someone opens a perfume bottle in a room filled with people, the perfume is at its highest concentration in the bottle and is at its lowest at the edges of the room. The perfume vapor will diffuse, or spread away, from the...
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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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Passive Diffusion: Overview and Kinetics01:17

Passive Diffusion: Overview and Kinetics

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Passive diffusion is a critical process that allows small lipophilic drugs to cross the cell membrane along a concentration gradient. This mechanism's efficiency depends on four primary factors: the membrane's surface area, the drug's lipid-water partition coefficient, the concentration gradient, and the membrane's thickness.
When administered orally, drugs establish a substantial concentration gradient between the gastrointestinal (GI) lumen and the bloodstream, expediting...
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Protein Dynamics in Living Cells01:19

Protein Dynamics in Living Cells

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Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...
2.1K
Facilitated Diffusion01:16

Facilitated Diffusion

381
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.
In this process, substrates such as organic compounds and ions interact with a transporter on one side, triggering conformational changes in proteins that enable...
381
Facilitated Transport01:19

Facilitated Transport

125.5K
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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Updated: Jun 23, 2025

From Fast Fluorescence Imaging to Molecular Diffusion Law on Live Cell Membranes in a Commercial Microscope
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FAST SOLVER FOR DIFFUSIVE TRANSPORT TIMES ON DYNAMIC INTRACELLULAR NETWORKS.

Lachlan Elam1, Mónica C Quiñones-Frías2, Ying Zhang1

  • 1Department of Mathematics, Brandeis University, Waltham, MA.

SIAM Journal on Applied Mathematics
|June 24, 2024
PubMed
Summary
This summary is machine-generated.

Particle transport in cells depends on intracellular networks. This study develops a computational method using network theory to analyze how network changes affect particle diffusion in cellular environments.

Keywords:
Sherman-Morrison formuladynamic networksendoplasmic reticulumintracellular transportmean-first passage time

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Area of Science:

  • Cellular biology
  • Biophysics
  • Network science

Background:

  • Intracellular particle transport is vital for cellular function.
  • Understanding transport dynamics in complex, changing cellular networks is challenging.

Purpose of the Study:

  • To characterize intracellular biological environments using network theory.
  • To develop an efficient computational method for simulating particle diffusion in these networks.

Main Methods:

  • Applied network theory to analyze intracellular environments.
  • Developed a computational method to calculate mean first passage times for diffusing particles.
  • Simulated diffusion on 2D planar networks derived from microscopy data.

Main Results:

  • Successfully benchmarked the methodology on synthetic networks.
  • Applied the method to real-world data from endoplasmic reticulum tubular networks.
  • Demonstrated the method's efficiency in characterizing particle transport dynamics.

Conclusions:

  • Network theory provides a powerful framework for studying intracellular transport.
  • The developed computational method enables efficient simulation of particle diffusion in complex cellular networks.
  • This approach can reveal how dynamic network changes impact particle movement within cells.