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Related Concept Videos

Gene Regulation in Microbial Communities: Quorum Sensing01:28

Gene Regulation in Microbial Communities: Quorum Sensing

Quorum sensing is a mechanism of bacterial communication that enables coordinated gene expression in response to changes in population density. This facilitates collective behaviors that enhance survival, resource acquisition, and ecological adaptation. This process relies on small signaling molecules called autoinducers that accumulate as bacterial populations grow. When a critical threshold concentration of autoinducers is reached, bacterial cells collectively modify gene expression,...
Bacterial Signaling01:30

Bacterial Signaling

Bacterial signaling can occur within bacteria (intracellular) or between bacteria (intercellular). At times, a group of bacteria behaves like a community. To achieve this, they engage in quorum sensing, the perception of higher cell density that causes changes in gene expression. Quorum sensing involves both extracellular and intracellular signaling. The signaling cascade starts with a molecule called an autoinducer (AI). Individual bacteria produce AIs that move out of the bacterial cell...
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...
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...
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...
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...

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Single-Molecule Tracking Microscopy - A Tool for Determining the Diffusive States of Cytosolic Molecules
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Single-Molecule Tracking Microscopy - A Tool for Determining the Diffusive States of Cytosolic Molecules

Published on: September 5, 2019

Quorum sensing and the confusion about diffusion.

Stuart A West1, Klaus Winzer, Andy Gardner

  • 1Department of Zoology, University of Oxford, Oxford, OX1 3PS, UK. Stuart.West@zoo.ox.ax.uk

Trends in Microbiology
|October 23, 2012
PubMed
Summary
This summary is machine-generated.

Quorum sensing (QS) and diffusion sensing (DS) are not competing theories for bacterial regulation. The key distinction lies in whether bacterial behaviors are social, not in the sensing mechanism itself.

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Last Updated: May 17, 2026

Single-Molecule Tracking Microscopy - A Tool for Determining the Diffusive States of Cytosolic Molecules
10:20

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Published on: April 9, 2019

Area of Science:

  • Microbiology
  • Systems Biology
  • Biochemistry

Background:

  • Bacterial extracellular behaviors are regulated by sensing local molecule concentrations.
  • Quorum sensing (QS) and diffusion sensing (DS) are proposed as competing hypotheses for this regulation.

Purpose of the Study:

  • To re-evaluate the relationship between QS and DS hypotheses.
  • To clarify the fundamental principles governing bacterial social behaviors and molecule sensing.
  • To address confusion arising from empirical attempts to differentiate QS and DS.

Main Methods:

  • Conceptual analysis of existing hypotheses (QS and DS).
  • Review and interpretation of empirical data related to bacterial sensing mechanisms.
  • Theoretical integration of social interactions and diffusion processes.

Main Results:

  • QS and DS are not mutually exclusive but share common ground.
  • Empirical distinctions between QS and DS are fundamentally flawed.
  • The critical factor is whether the bacterial trait is social, not the sensing mechanism.
  • Data support both social interaction models and diffusion's role.
  • Alternative hypotheses like efficiency sensing (ES) are unnecessary.

Conclusions:

  • The dichotomy between QS and DS is artificial.
  • Focusing on the social nature of bacterial traits provides a clearer framework.
  • Jargon in this field can obscure fundamental biological questions.