Related Experiment Video
Updated: Aug 6, 2026

Monitoring Intraspecies Competition in a Bacterial Cell Population by Cocultivation of Fluorescently Labelled Strains
Published on: January 18, 2014
Extinction transition in bacterial colonies under forced convection
T Neicu1, A Pradhan, D A Larochelle
1Department of Physics, Clark University, Worcester, Massachusetts 01610, USA.
Abstract:
We report the spatiotemporal response of Bacillus subtilis growing on a nutrient-rich layer of agar to ultraviolet (UV) radiation. Below a crossover temperature, the bacteria are confined to regions that are shielded from UV radiation. A forced convection of the population is effected by rotating a UV radiation shield relative to the Petri dish. The extinction speed at which the bacterial colony lags behind the shield is found to be qualitatively similar to the front velocity of the colony growing in the absence of a hostile environment as predicted by the model of Dahmen, Nelson, and Shnerb. A quantitative comparison is not possible without considering the slow dynamics and time-dependent interaction of the population with the hostile environment.
More Related Videos
Related Concept Videos
Passive Diffusion: Overview and Kinetics
When administered orally, drugs establish a substantial concentration gradient between the gastrointestinal (GI) lumen and the bloodstream, expediting their diffusion into...
Steady, Laminar Flow Between Parallel Plates
Couette Flow
Steady, Laminar Flow in Circular Tubes
Bacterial Growth Curve
Evolution of New Traits in Microbes

