Related Experiment Video
Updated: Jul 17, 2026
04:44
Visualizing Bacterial Motility Based on a Color Reaction
Published on: February 15, 2022
Correlating single cell motility with population growth dynamics for flagellated bacteria
Sucheta Arora1, Vidya Bhat, Aditya Mittal
1Department of Biochemical Engineering & Biotechnology, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India.
Biotechnology and Bioengineering
|February 3, 2007
Summary
Bacterial motility, particularly "running," decreases as bacterial populations grow. This finding suggests individual cell movement is crucial for bioprocess design and understanding biofilm formation.
Area of Science:
- Microbiology
- Biotechnology
- Bioprocess Engineering
Background:
- Many bacteria used in biotechnology are motile, using "bio-nanopropeller" movement for chemotaxis.
- Single cell motility is often overlooked in bioreactor operations due to the scale difference between cells and bulk fluid volumes.
Purpose of the Study:
- To investigate the relationship between individual bacterial cell motility and population growth dynamics.
- To determine if single cell motility characteristics influence bioreactor operations.
Main Methods:
- Observed motility behavior of individual bacterial cells using high-resolution video microscopy (33 ms time resolution).
- Correlated single cell motility data with population growth dynamics in batch cultures of Escherichia coli.
Main Results:
- Overall bacterial motility, specifically the "running" behavior, significantly decreases as the bacterial population grows.
- Motility patterns change throughout the bacterial growth curve.
Conclusions:
- Individual bacterial cell motility is an important parameter in bioprocess design.
- Findings have implications for understanding and controlling biofilm formation.
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...
01:16Cell Motility through Blebbing
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...
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...
01:13Actin Polymerization and Cell Motility
Actin is a family of globular proteins that are highly abundant in eukaryotic cells. It makes up approximately 1-5% of total cell protein concentration. Actin monomers polymerize to form a complex network of polarized filaments, the actin cytoskeleton, that plays a crucial role in many cellular processes, including cell motility, division, endocytosis, and metastasis of cancer cells.
Actin cytoskeleton dynamics can produce pushing, pulling, and resistance forces that help the cell to migrate.
Actin cytoskeleton dynamics can produce pushing, pulling, and resistance forces that help the cell to migrate.
01:24Microtubules in Cell Motility
Microtubules are thick hollow cylindrical proteins that help form the cytoskeleton. Microtubules have varied roles in the cell. These filaments help form cellular appendages like cilia and flagella, which are responsible for locomotion. The cilia arise from basal bodies, separated from the main body by a membrane-like structure forming the transition zone. This zone is the gate for the entry of lipids and proteins, creating a unique composition of lipids and proteins in the ciliary membrane and...