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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...
Gene Flow02:39

Gene Flow

Gene flow is the transfer of genes among populations, resulting from either the dispersal of gametes or from the migration of individuals.
Behavior of Gas Molecules: Molecular Diffusion, Mean Free Path, and Effusion03:48

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

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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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...
Evolution of New Traits in Microbes01:24

Evolution of New Traits in Microbes

Microorganisms evolve rapidly due to their large population sizes and short generation times, often exhibiting measurable changes within days under laboratory conditions. Natural selection acts on standing genetic variation, enabling the retention and amplification of beneficial traits that confer fitness advantages in changing environments.Adaptive Pigment Regulation in RhodobacterIn Rhodobacter, a genus of purple non-sulfur bacteria, light-harvesting pigments such as bacteriochlorophyll and...

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Related Experiment Video

Updated: May 19, 2026

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

Published on: November 12, 2020

Evolution of cross-diffusion and self-diffusion.

Yuan Lou1, Salome Martínez

  • 1Department of Mathematics, Ohio State University, Columbus, OH, USA. lou.8@osu.edu

Journal of Biological Dynamics
|August 11, 2012
PubMed
Summary
This summary is machine-generated.

In competing species, the one with a smaller gradient in density-dependent dispersal strategy (cross-diffusion and self-diffusion) is predicted to win in a 1D habitat. Constant diffusion coefficients may offer a competitive advantage.

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Last Updated: May 19, 2026

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Area of Science:

  • Ecology
  • Mathematical Biology
  • Evolutionary Biology

Background:

  • Investigates density-dependent dispersal strategies in competing species.
  • Focuses on cross-diffusion and self-diffusion mechanisms where movement rates depend on species densities.

Purpose of the Study:

  • To analyze the evolution of dispersal strategies in two competing species with identical population dynamics.
  • To determine how density-dependent movement affects competitive outcomes.

Main Methods:

  • Mathematical modeling of species interactions and dispersal.
  • Analysis of diffusion coefficients and their gradients in a one-dimensional homogeneous habitat.

Main Results:

  • When diffusion coefficient gradients align, the species with the smaller gradient evolves, suggesting competitive advantage.
  • Constant diffusion coefficients may outperform non-constant ones.
  • Oppositely directed gradients allow for species coexistence.

Conclusions:

  • Dispersal strategy, specifically the gradient of cross- and self-diffusion, is a key factor in competitive exclusion or coexistence.
  • Habitat dimensionality and diffusion coefficient characteristics significantly influence evolutionary outcomes.