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Updated: Jul 17, 2026

Continuous Measurement of Biological Noise in Escherichia Coli Using Time-lapse Microscopy
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Published on: April 27, 2021

Discrimination between single Escherichia coli cells using time-resolved confocal spectroscopy.

Joshua B Edel1, Pedro Lahoud, Anthony E G Cass

  • 1Institute of Biomedical Engineering, Department of Chemistry, South Kensington, London, SW7 2AZ, United Kingdom.

The Journal of Physical Chemistry. B
|February 3, 2007
PubMed
Summary

This study introduces a novel microfluidic technique using single-cell time-correlated single-photon counting to rapidly distinguish between bacterial cell populations. The method precisely differentiates cells based on fluorescent protein characteristics for advanced sorting applications.

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Area of Science:

  • Biophysics
  • Microfluidics
  • Cell Biology

Background:

  • Distinguishing between single-cell populations in microfluidic streams is crucial for various biological applications.
  • Existing methods may lack the speed or precision required for high-throughput analysis.

Purpose of the Study:

  • To develop and validate a rapid technique for discriminating between single-cell populations in microfluidic systems.
  • To characterize individual bacterial cells based on their fluorescent protein expression.

Main Methods:

  • Utilized standard confocal fluorescence microscopy with femtoliter detection volumes.
  • Employed single-cell time-correlated single-photon counting (scTCSPC) and photon burst spectroscopy.
  • Characterized individual Escherichia coli cells expressing green, cyano, or yellow fluorescent proteins.

Main Results:

  • Demonstrated precise discrimination between single-cell populations based on measured burst width characteristics.
  • Identified fluorescence quantum yield and absorption cross-section as key discriminating factors.
  • Successfully determined individual fluorescence lifetimes using scTCSPC and deconvolution procedures.

Conclusions:

  • The developed technique offers a simple yet powerful approach for high-precision single-cell discrimination.
  • Well-defined burst width distributions facilitate efficient single-cell sorting.
  • This method has significant potential for advancing cell sorting technologies.