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Related Concept Videos

Coagulation01:06

Coagulation

Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
Colloidal precipitates01:09

Colloidal precipitates

The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
Colloids03:22

Colloids

Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
The Colloidal State01:29

The Colloidal State

The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called the...
Cohesion01:07

Cohesion

Cohesion is the attraction between molecules of the same type, such as water molecules. Water molecules have an overall neutral charge but are polar molecule. An oxygen atom in one water molecule has a partial negative charge that can bind to a hydrogen atom with a partial positive charge in a second water molecule, forming a hydrogen bond. Each water molecule can form up to four hydrogen bonds with other water molecules. Hydrogen bonds are responsible for water's cohesive nature.
On a surface,...
Colloids and Suspensions01:17

Colloids and Suspensions

Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...

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Related Experiment Video

Updated: May 19, 2026

The Use of Chemostats in Microbial Systems Biology
13:19

The Use of Chemostats in Microbial Systems Biology

Published on: October 14, 2013

How flocculation can explain coexistence in the chemostat.

B Haegeman1, A Rapaport

  • 1Laboratoire de Biotechnologie de l'Environnement, INRA, Avenue des Etangs, 11100 Narbonne, France.

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

Microbial flocculation enables species coexistence in chemostat models by allowing slower-growing species to survive. This aggregation mechanism explains density-dependent growth in microbial communities.

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Last Updated: May 19, 2026

The Use of Chemostats in Microbial Systems Biology
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Area of Science:

  • Microbial Ecology
  • Mathematical Biology
  • Population Dynamics

Background:

  • Chemostat models are used to study microbial population dynamics.
  • Competition between microbial species often leads to competitive exclusion.
  • Flocculation, or aggregation, is a phenomenon observed in some microbial species.

Purpose of the Study:

  • To investigate the conditions under which two microbial species can coexist in a chemostat.
  • To explore the role of flocculation in enabling species coexistence.
  • To provide a mechanistic explanation for density-dependent growth.

Main Methods:

  • Mathematical modeling of a two-species chemostat system.
  • Analysis of species coexistence based on growth rates and flocculation dynamics.
  • Numerical simulations to validate the mathematical model across a wide parameter range.

Main Results:

  • Species coexistence is possible when the dominant competitor forms flocs.
  • Flocculation, assumed to be a fast process, facilitates coexistence.
  • The model successfully explains density-dependent growth phenomena.

Conclusions:

  • Flocculation is a key mechanism promoting species coexistence in resource-limited environments.
  • The developed chemostat model provides a mechanistic basis for density-dependent growth.
  • Mathematical and numerical approaches are effective in studying microbial ecological dynamics.