Related Experiment Video
Updated: May 18, 2026
07:40
Monitoring Spatial Segregation in Surface Colonizing Microbial Populations
Published on: October 29, 2016
Stripe formation in bacterial systems with density-suppressed motility
Xiongfei Fu1, Lei-Han Tang, Chenli Liu
1Department of Physics, The University of Hong Kong, Pokfulam, Hong Kong, China.
Physical Review Letters
|September 26, 2012
Summary
Engineered bacteria form density stripes on agar plates due to reduced motility at high cell concentrations. This study models the stripe formation mechanism and identifies conditions for stripe generation.
Area of Science:
- Microbial Ecology
- Theoretical Biology
- Biophysics
Background:
- Engineered bacteria exhibit density-dependent motility changes.
- Pattern formation in microbial colonies is a key area of research.
- Understanding self-organization in biological systems is crucial.
Purpose of the Study:
- To theoretically investigate the origin and mechanism of periodic stripe formation in engineered bacteria.
- To analyze the spreading dynamics of immotile bacterial regions.
- To determine the phase boundary between stripe and no-stripe formation.
Main Methods:
- Development of a kinetic model incorporating growth and density-suppressed motility.
- Theoretical analysis of the bacterial front profile during spreading.
- Derivation of an analytic ansatz to predict phase boundaries.
Main Results:
- The model successfully reproduces periodic stripe formation observed in experiments.
- The spreading of immotile cells into cell-free regions was mathematically analyzed.
- A phase boundary separating stripe and non-stripe regimes was analytically determined.
Conclusions:
- Density-suppressed motility is a key mechanism driving stripe formation in engineered bacteria.
- The theoretical framework provides insights into the conditions governing bacterial pattern formation.
- The study offers a method to predict stripe formation based on model parameters.
Related Concept Videos
01:18Flagella and Motility in Bacteria
Flagella are specialized, thread-like structures that extend from a bacteria's cell envelope. They play a crucial role in motility and chemotaxis. Their structural organization and functioning exemplify sophisticated biological engineering, enabling bacterial survival and adaptability in diverse environments.Structure of the FlagellumA bacterial flagellum consists of three key components: the filament, the hook, and basal body. The filament, a long, helical structure composed of repeating...
01:13Special Staining Techniques
Specialized staining techniques play a vital role in microbiology by enabling the visualization of specific bacterial structures that remain undetectable with standard microscopy methods. These techniques not only enhance the structural visualization of bacterial cells but also provide critical insights into their pathogenicity and classification. Additionally, they support diagnostic and research endeavors in microbiology by identifying key bacterial features.Capsule Staining for Virulence...
01:27Chemotaxis in E. coli
Chemotaxis in Escherichia coli is a sensory-driven motility mechanism that enables bacteria to navigate chemical gradients, moving toward beneficial environments while avoiding harmful conditions. This process relies on a signal transduction system integrating external chemical cues with flagellar motor control.Chemoreceptors and Signal DetectionE. coli detects chemical gradients through methyl-accepting chemotaxis proteins (MCPs), which are membrane-bound chemoreceptors that sense attractants...
01:28Fimbriae, Pili, and Axial Filaments
Fimbriae and pili are specialized bacterial surface structures that play pivotal roles in adhesion, genetic exchange, and motility. Composed primarily of pilin protein, these hairlike appendages are crucial for bacterial survival and pathogenicity in various environments.Fimbriae: Adhesion and PathogenicityFimbriae are fine, filamentous structures measuring 2–10 nanometers in diameter and are densely distributed on the bacterial cell surface. They facilitate bacterial adhesion to abiotic...
01:29Cytoskeletal Proteins in Bacteria
Bacterial cells were initially considered simple, randomly organized structures lacking a cytoskeleton. However, the discovery of cytoskeleton homologs in bacteria led to the change of this opinion. Bacterial cytoskeletal filaments regulate the cell shape, cell polarity, cell division, and partitioning of plasmids during cell division. It was later discovered that bacterial cytoskeletal proteins, mainly actin and tubulin homologs, are diverse compared to their eukaryotic counterparts. On the...
01:27Diversity of Protists IV
Amoebozoa represent a diverse group of terrestrial and aquatic protists that utilize lobe-shaped pseudopodia for locomotion and feeding. This characteristic differentiates them from the Rhizaria, which possess threadlike pseudopodia. The primary classifications within Amoebozoa include gymnamoebas, entamoebas, and the plasmodial and cellular slime molds. Phylogenetic evidence indicates that Amoebozoa diverged from a lineage that ultimately gave rise to fungi and animals.Gymnamoebas and...