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Related Experiment Videos

How does a bacterium grow during its cell cycle?

I D Burdett, T B Kirkwood

    Journal of Theoretical Biology
    |July 7, 1983
    PubMed
    Summary
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    Understanding bacterial cell growth kinetics is crucial. The Collins-Richmond principle offers a powerful method for analyzing bacterial surface extension, with proposed modifications for greater accuracy.

    Area of Science:

    • Microbiology
    • Cell Biology
    • Biophysics

    Background:

    • Rod-shaped bacteria like Escherichia coli and Bacillus subtilis exhibit continuous length extension between cell divisions.
    • The precise kinetics of individual bacterial cell growth in a steady state remain largely uncharacterized.
    • Existing models often struggle due to significant cell-cycle-dependent size variations.

    Purpose of the Study:

    • To critically review methods for determining bacterial surface extension patterns.
    • To evaluate the suitability of different growth models for bacterial cell elongation.
    • To identify the most effective approach for analyzing bacterial growth kinetics.

    Main Methods:

    • Analysis of existing literature on bacterial growth kinetics.

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  • Comparison of experimental cell length distributions with theoretical models (linear, bilinear, exponential).
  • Description and evaluation of the Collins-Richmond principle for growth rate calculation.

    • Main Results:

    • Cell size variation throughout the cell cycle significantly limits models relying on average cellular dimensions.
    • The Collins-Richmond principle is identified as the most robust method for bacterial growth kinetics analysis.
    • Proposed modification to the Collins-Richmond method to calculate growth rates between specific cell cycle events.

    Conclusions:

    • Bacterial cell growth kinetics are complex and influenced by cell cycle variations.
    • The Collins-Richmond principle provides a powerful framework for studying bacterial elongation.
    • Refined methods are needed to capture nuanced growth dynamics within the bacterial cell cycle.