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Related Experiment Videos

Sorting out bacterial viability with optical tweezers.

M Ericsson1, D Hanstorp, P Hagberg

  • 1Department of Physics, Chalmers University of Technology and Göteborg University, Göteborg, Sweden.

Journal of Bacteriology
|September 15, 2000
PubMed
Summary

Researchers developed a method to assess bacterial cell viability. They found that loss of reproductive ability can precede loss of membrane integrity in stationary-phase Escherichia coli.

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Area of Science:

  • Microbiology
  • Cell Biology
  • Biophysics

Background:

  • Bacterial populations in stationary phase exhibit heterogeneity in viability.
  • Assessing single-cell viability in bacteria is crucial for understanding population dynamics.
  • Traditional methods may not fully capture the nuances of cell death and dormancy.

Purpose of the Study:

  • To develop and validate a method for assessing single-cell viability in stationary-phase Escherichia coli.
  • To investigate the relationship between cell membrane integrity and reproductive potential.
  • To explore mechanisms of bacterial death and heterogeneity during stationary phase.

Main Methods:

  • Utilized laser optical tweezers for single-cell manipulation.
  • Employed direct microscopic analysis to assess reproductive potential.

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  • Used propidium iodide, a fluorescent nucleic acid stain, to evaluate membrane integrity.

    • Main Results:

    • Reduced cell integrity correlated with decreased proliferating potential in stationary-phase Escherichia coli.
    • Cells with reduced integrity failed to divide upon nutrient addition.
    • A small percentage of intact cells (6.6%) failed to replicate, indicating reproductive ability loss can precede membrane integrity loss.
    • Observed localized cell deterioration in some dividing cells.

    Conclusions:

    • Reproductive ability can be lost before membrane integrity is compromised in stationary-phase bacteria.
    • The developed optical trapping method is valuable for studying bacterial death mechanisms and population heterogeneity.
    • Evidence suggests localized cell deterioration contributes to population heterogeneity.