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Quorum sensing is a mechanism of bacterial communication that enables coordinated gene expression in response to changes in population density. This facilitates collective behaviors that enhance survival, resource acquisition, and ecological adaptation. This process relies on small signaling molecules called autoinducers that accumulate as bacterial populations grow. When a critical threshold concentration of autoinducers is reached, bacterial cells collectively modify gene expression,...
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Bacterial signaling can occur within bacteria (intracellular) or between bacteria (intercellular). At times, a group of bacteria behaves like a community. To achieve this, they engage in quorum sensing, the perception of higher cell density that causes changes in gene expression. Quorum sensing involves both extracellular and intracellular signaling. The signaling cascade starts with a molecule called an autoinducer (AI). Individual bacteria produce AIs that move out of the bacterial cell...
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Related Experiment Video

Updated: Jan 2, 2026

In Situ Measurement and Correlation of Cell Density and Light Emission of Bioluminescent Bacteria
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Cell activity evaluation during bacterial bioluminescence oscillation.

Satoshi Sasaki1, Kurumi Yoshida1

  • 1Faculty of Medical Technology, School of Health Science, Tokyo University of Technology.

The Journal of General and Applied Microbiology
|December 13, 2019
PubMed
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Bacterial bioluminescence oscillations in Photobacterium kishitanii were studied. A model explains how luminescence changes relate to dissolved oxygen and cell activity, revealing insights into bacterial behavior.

Keywords:
bioluminescent bacteriadissolved oxygenluminescenceoscillationproduct

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Area of Science:

  • Microbiology
  • Biochemistry
  • Biophysics

Background:

  • Bacterial bioluminescence, particularly in Photobacterium species, is a complex phenomenon.
  • Understanding the dynamics of bioluminescence is crucial for various biotechnological applications.
  • Cellular activities significantly influence light emission in bacteria.

Purpose of the Study:

  • To investigate the reproducibility of oscillations in bacterial bioluminescence.
  • To correlate bioluminescence patterns with key bacterial cell activities.
  • To develop a model for the luminescence-dissolved oxygen relationship.

Main Methods:

  • Culturing Photobacterium kishitanii in liquid media.
  • Monitoring bioluminescence intensity over time.
  • Measuring dissolved oxygen (DO) consumption.
  • Assessing esterase activity and product production rates.

Main Results:

  • Observed oscillations in bacterial bioluminescence were reproducible.
  • A correlation was found between luminescence decrease and dissolved oxygen increase.
  • Bacterial cell activities showed a monotonous decrease over time.

Conclusions:

  • The study proposes a simple model for bacterial bioluminescence dynamics.
  • The model links luminescence, dissolved oxygen levels, and cell activity.
  • Findings provide a basis for understanding and predicting bioluminescence behavior.