Related Experiment Video
Updated: Sep 20, 2025
10:07
Generating Controlled, Dynamic Chemical Landscapes to Study Microbial Behavior
Published on: January 31, 2020
6.3K
Pairwise encounters boost bacterial motion by transient velocity spikes
Pu Feng1, Chen Gui2, Gancheng Wang3
1School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510641, China.
Biophysical Journal
|May 23, 2025
Summary
Bacterial encounters near surfaces alter swimming speed and direction, contrasting with solitary cells. These interactions offer propulsion advantages, impacting bacterial social behavior and microdevice design.
Area of Science:
- Microbiology
- Biophysics
- Fluid Dynamics
Background:
- Swimming bacteria exhibit social behavior influenced by pairwise encounters near surfaces.
- Tracking interplaying bacteria in 3D is challenging, limiting understanding of encounter dynamics.
Purpose of the Study:
- To elucidate the motion dynamics of encountering Escherichia coli (E. coli) in 3D.
- To investigate how cell-cell encounters influence bacterial swimming speed, angle, and temporal correlations.
Main Methods:
- Combined 3D holographic tracking experiments with hydrodynamic simulations.
- Analyzed the motion of individual and paired E. coli under various encounter scenarios.
Main Results:
- Encounters induce transient fluctuations in E. coli swimming speed and angle, reducing temporal correlations compared to solitary cells.
- Bacteria accelerate when approaching face-to-face and decelerate during pursuits; motion is governed by relative angle, velocity, and distance.
- Surface presence mitigates velocity spikes, and encounters influence tumble timing, often preceding close proximity.
Conclusions:
- Bacterial encounters, despite transient effects, provide a propulsion advantage for smooth-swimming E. coli.
- Findings offer insights into bacterial physiology and guidance for designing active microdevices.
Related Concept Videos
01:10Intracellular Movement of Viruses and Bacteria
2.9K
Intracellular bacteria and viruses often comprise a group of highly infectious pathogens that can cause several diseases. Bacterial pathogens include those belonging to the genus Rickettsia responsible for conditions such as rocky mountain spotted fever and the Mediterranean spotted fever; Chlamydia, a genus responsible for a sexually transmitted disease; Coxiella burnetii, an agent responsible for Q fever. Viral pathogens include vaccinia—a poxvirus, and herpes simplex virus—a...
2.9K
01:29Coordination of Gene Expression Processes in Bacteria
169
The DNA replication, transcription, and translation processes are intricately coupled in bacteria, allowing efficient gene expression and rapid protein synthesis. While this physical and functional coordination is advantageous, it introduces challenges that bacteria overcome through specific regulatory mechanisms.Coupling of Replication, Transcription, and TranslationThe coupling of replication, transcription, and translation is a hallmark of bacterial gene expression. As the replisome unwinds...
169
01:18Flagella and Motility in Bacteria
594
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...
594
01:28Fimbriae, Pili, and Axial Filaments
402
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...
402
01:27Chemotaxis in E. coli
120
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...
120
01:16Cell Motility through Blebbing
2.0K
Blebs are a type of membrane protrusion formed by the internal hydrostatic pressure of the cytoplasm. Blebs are observed in several cell types, including fibroblasts, immune cells, and single-celled organisms like the amoeba. The primary function of blebs is cell locomotion and apoptosis, but they are also found during necrosis and cell division. The life cycle of a bleb comprises an initiation phase followed by the expansion and retraction phases.
Blebbing Through the Matrix
In multicellular...
Blebbing Through the Matrix
In multicellular...
2.0K