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Related Experiment Video

Updated: Jun 25, 2026

In Situ Measurement and Correlation of Cell Density and Light Emission of Bioluminescent Bacteria
05:52

In Situ Measurement and Correlation of Cell Density and Light Emission of Bioluminescent Bacteria

Published on: June 28, 2018

Bioluminescence intensity difference observed in luminous bacteria groups with different motility.

S Sasaki1, T Okamoto, T Fujii

  • 1School of Bionics, Tokyo University of Technology, Tokyo, Japan. sasaki@bs.teu.ac.jp

Letters in Applied Microbiology
|February 12, 2009
PubMed
Summary

Mobile marine luminous bacteria exhibit higher bioluminescence intensity than non-mobile bacteria. This study effectively separated bacteria by motility using microfluidics to reveal this difference.

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Area of Science:

  • Marine microbiology
  • Bioluminescence research
  • Microfluidics applications

Background:

  • Marine luminous bacteria are crucial in oceanic ecosystems.
  • Bioluminescence intensity can vary between bacterial populations.
  • Understanding factors influencing bioluminescence is important.

Purpose of the Study:

  • To compare bioluminescence intensity in marine luminous bacteria with differing motility.
  • To establish a method for separating bacteria based on motility.

Main Methods:

  • Utilized a microfluidic device for motility-based separation of luminous bacteria.
  • Measured cell densities and luminescent intensity of separated bacterial groups.
  • Calculated and compared per-cell bioluminescence intensity between mobile and non-mobile bacteria.

Main Results:

  • Successfully separated mobile (swimmers) and non-mobile (nonswimmers) luminous bacteria.
  • Demonstrated significantly higher luminescent intensity per cell in mobile bacteria compared to non-mobile counterparts.
  • Confirmed microfluidics as an effective tool for bacterial separation.

Conclusions:

  • Microfluidic separation is effective for analyzing bioluminescent bacteria.
  • Motility is a key factor influencing individual cell bioluminescence in Photobacterium kishitanii.
  • This study provides a novel method for examining single-cell functions in P. kishitanii.