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Related Concept Videos

Diffusion01:21

Diffusion

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...
Diffusion01:12

Diffusion

Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...
Passive Diffusion: Overview and Kinetics01:17

Passive Diffusion: Overview and Kinetics

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 their diffusion into...
Facilitated Transport01:19

Facilitated Transport

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 membrane via...
Facilitated Transport01:19

Facilitated Transport

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 membrane via...
Facilitated Transport01:19

Facilitated Transport

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 membrane via...

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Related Experiment Video

Updated: Jun 15, 2026

The Diffusion of Passive Tracers in Laminar Shear Flow
08:01

The Diffusion of Passive Tracers in Laminar Shear Flow

Published on: May 1, 2018

Directed transport driven by Lévy flights coexisting with subdiffusion.

Bao-quan Ai1, Ya-feng He

  • 1Laboratory of Quantum Information Technology, ICMP and SPTE, South China Normal University, 510006 Guangzhou, China. aibq@hotmail.com

The Journal of Chemical Physics
|March 10, 2010
PubMed
Summary
This summary is machine-generated.

Directed transport of Brownian particles is achieved through Lévy flights and subdiffusion in asymmetric potentials. Optimal Lévy index and a subdiffusion threshold are crucial for maximal group velocity and ratchet effects.

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Last Updated: Jun 15, 2026

The Diffusion of Passive Tracers in Laminar Shear Flow
08:01

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Published on: May 1, 2018

Spot Variation Fluorescence Correlation Spectroscopy for Analysis of Molecular Diffusion at the Plasma Membrane of Living Cells
05:56

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

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Area of Science:

  • Physics
  • Statistical Mechanics
  • Nonlinear Dynamics

Background:

  • Brownian motion in asymmetric potentials can lead to directed transport (ratchet effects).
  • Lévy flights introduce non-Markovian dynamics and anomalous diffusion.
  • Subdiffusion describes slower-than-Fickian particle movement.

Purpose of the Study:

  • Investigate particle transport driven by Lévy flights and subdiffusion.
  • Analyze the influence of subdiffusion and Lévy index on transport properties.
  • Identify conditions for directed transport in the absence of external forces.

Main Methods:

  • Langevin-type dynamics simulations.
  • Subordination techniques to model Lévy flights and subdiffusion.
  • Calculation of group velocity to quantify transport.

Main Results:

  • Group velocity increases monotonically with the subdiffusive index.
  • An optimal Lévy index maximizes the group velocity.
  • A threshold subdiffusive index is required to observe ratchet effects.
  • Non-thermal Lévy flights and potential asymmetry are essential for directed transport.

Conclusions:

  • Directed transport emerges from the interplay of Lévy flights and subdiffusion in asymmetric potentials.
  • Competition between these transport mechanisms leads to unique phenomena, including pseudonormal diffusion at the median.
  • The findings highlight the importance of anomalous diffusion and non-equilibrium dynamics in particle transport.