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Related Concept Videos

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...
Protein Diffusion in the Membrane01:24

Protein Diffusion in the Membrane

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...
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...
Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model01:09

Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model

Various dissolution theories provide insight into the factors that influence the dissolution rate. Danckwerts' Model suggests that turbulence, rather than a stagnant layer, characterizes the dissolution medium at the solid-liquid interface. In this model, the agitated solvent contains macroscopic packets that move to the interface via eddy currents, facilitating the absorption and delivery of the drug to the bulk solution. The regular replenishment of solvent packets maintains the concentration...
Drug Absorption Mechanism: Passive Membrane Transport01:23

Drug Absorption Mechanism: Passive Membrane Transport

Passive transport is a method of drug absorption where small, lipid-soluble drugs can move across the cell membrane. This movement happens along the concentration gradient, which is a natural flow from higher to lower concentration areas. The speed at which the drug moves is directly related to its lipid–water partition coefficient. This means that the more a drug dissolves in lipids, the faster it diffuses or spreads throughout the body. It is important to note that most drugs are either weak...

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Related Experiment Video

Updated: Jun 21, 2026

Adhesion Frequency Assay for In Situ Kinetics Analysis of Cross-Junctional Molecular Interactions at the Cell-Cell Interface
13:22

Adhesion Frequency Assay for In Situ Kinetics Analysis of Cross-Junctional Molecular Interactions at the Cell-Cell Interface

Published on: November 2, 2011

How subdiffusion changes the kinetics of binding to a surface.

Irwin M Zaid1, Michael A Lomholt, Ralf Metzler

  • 1Physics Department, Technical University of Munich, Garching, Germany.

Biophysical Journal
|August 5, 2009
PubMed
Summary
This summary is machine-generated.

Biopolymers exhibit subdiffusion in crowded environments. This study explores particle exchange dynamics at reactive boundaries, revealing implications for biological processes like gene regulation and membrane transport.

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Study of Short Peptide Adsorption on Solution Dispersed Inorganic Nanoparticles Using Depletion Method
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Study of Short Peptide Adsorption on Solution Dispersed Inorganic Nanoparticles Using Depletion Method

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Related Experiment Videos

Last Updated: Jun 21, 2026

Adhesion Frequency Assay for In Situ Kinetics Analysis of Cross-Junctional Molecular Interactions at the Cell-Cell Interface
13:22

Adhesion Frequency Assay for In Situ Kinetics Analysis of Cross-Junctional Molecular Interactions at the Cell-Cell Interface

Published on: November 2, 2011

Study of Short Peptide Adsorption on Solution Dispersed Inorganic Nanoparticles Using Depletion Method
09:43

Study of Short Peptide Adsorption on Solution Dispersed Inorganic Nanoparticles Using Depletion Method

Published on: April 11, 2020

Area of Science:

  • Biophysics
  • Physical Chemistry
  • Systems Biology

Background:

  • Biopolymers in molecular crowding exhibit anomalous subdiffusion, characterized by (r(2)(t)) ~ t^alpha where 0 < alpha < 1.
  • Understanding particle dynamics at boundaries is crucial for cellular processes.

Purpose of the Study:

  • To investigate the exchange dynamics of subdiffusing biopolymers with a reactive boundary.
  • To derive generalized boundary conditions and analyze unbinding phenomena.
  • To explore the consequences of weak ergodicity breaking on material exchange.

Main Methods:

  • Utilizing a continuous time random walk (CTRW) model.
  • Developing a generalized boundary condition for subdiffusive systems.
  • Analyzing particle unbinding kinetics.

Main Results:

  • The CTRW approach successfully models subdiffusive particle exchange at reactive boundaries.
  • Weak ergodicity breaking significantly impacts the efficiency of material exchange between boundary and bulk.
  • Derived generalized boundary conditions provide a quantitative framework for these dynamics.

Conclusions:

  • Subdiffusion and weak ergodicity breaking are critical factors in biological material exchange.
  • Findings offer insights into gene regulation and membrane-bulk transport mechanisms.
  • Experimental methods are proposed to validate subdiffusive behavior in biological systems.