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Related Concept Videos

Diffusion01:12

Diffusion

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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...
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Protein Diffusion in the Membrane01:24

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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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Behavior of Gas Molecules: Molecular Diffusion, Mean Free Path, and Effusion03:48

Behavior of Gas Molecules: Molecular Diffusion, Mean Free Path, and Effusion

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Although gaseous molecules travel at tremendous speeds (hundreds of meters per second), they collide with other gaseous molecules and travel in many different directions before reaching the desired target. At room temperature, a gaseous molecule will experience billions of collisions per second. The mean free path is the average distance a molecule travels between collisions. The mean free path increases with decreasing pressure; in general, the mean free path for a gaseous molecule will be...
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Comparing Intermolecular Forces: Melting Point, Boiling Point, and Miscibility02:34

Comparing Intermolecular Forces: Melting Point, Boiling Point, and Miscibility

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Intermolecular forces are attractive forces that exist between molecules. They dictate several bulk properties, such as melting points, boiling points, and solubilities (miscibilities) of substances. Molar mass, molecular shape, and polarity affect the strength of different intermolecular forces, which influence the magnitude of physical properties across a family of molecules.
Temporary attractive forces like dispersion are present in all molecules, whether they are polar or nonpolar. They...
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Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model01:09

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

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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...
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Updated: Sep 4, 2025

Single-Molecule Diffusion and Assembly on Polymer-Crowded Lipid Membranes
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Single-Molecule Diffusion and Assembly on Polymer-Crowded Lipid Membranes

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How macromolecules softness affects diffusion under crowding.

Edyta Słyk1,2, Tomasz Skóra1, Svyatoslav Kondrat1,3,4,5

  • 1Institute of Physical Chemistry, Polish Academy of Sciences, 01-224 Warsaw, Poland. svyatoslav.kondrat@gmail.com.

Soft Matter
|July 14, 2022
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Summary
This summary is machine-generated.

Macromolecule softness impacts diffusion in crowded cellular environments. Soft crowders typically slow diffusion less than hard crowders, but exceptions exist for elongated molecules like DNA.

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Area of Science:

  • Biophysics
  • Cell Biology
  • Computational Biology

Background:

  • Intracellular diffusion is vital for cellular functions like metabolism and gene expression.
  • Previous research focused on anomalous subdiffusion, molecular interactions, and shapes, neglecting crowder softness.
  • Macromolecular softness is an understudied factor influencing diffusion dynamics within cells.

Purpose of the Study:

  • To investigate the influence of crowder softness on macromolecular diffusion using simulations.
  • To compare the effects of soft versus hard crowders on tracer diffusion.
  • To understand how crowder properties affect diffusion in crowded biological systems.

Main Methods:

  • Brownian dynamics simulations were employed to model diffusion.
  • Simulations varied crowder softness and tracer macromolecule characteristics.
  • Analysis focused on diffusion coefficients under different crowding conditions.

Main Results:

  • Soft crowders generally impede macromolecular diffusion less than hard crowders (e.g., Ficoll).
  • At 30% volume fraction, diffusion was ~20% slower in hard crowders compared to soft ones.
  • Elongated macromolecules, like DNA, showed comparable or faster diffusion in hard crowders.

Conclusions:

  • Crowder softness and macromolecule shape are critical determinants of diffusion in crowded environments.
  • The excluded volume effects differ between soft and hard crowders, impacting tracer mobility.
  • Findings are relevant for understanding diverse intracellular transport and reaction dynamics.