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Related Experiment Videos

How close to the theoretical diffusion limit do bacterial uptake systems function?

A L Koch, C H Wang

    Archives of Microbiology
    |February 1, 1982
    PubMed
    Summary
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    Escherichia coli growth rate deviates from the Monod law due to a passive diffusion barrier in its outer membrane. Long-term culture alters membrane channels and uptake activity, increasing glucose dependence.

    Area of Science:

    • Microbiology
    • Biophysics
    • Biochemistry

    Background:

    • The Monod growth law is a fundamental model describing microbial growth kinetics.
    • Understanding bacterial nutrient uptake is crucial for various biotechnological applications.

    Purpose of the Study:

    • To investigate the specific growth rate dependence of Escherichia coli on glucose concentration.
    • To elucidate the mechanisms underlying deviations from the Monod growth law in bacterial cultures.

    Main Methods:

    • Utilized a high-precision spectrophotometer with a flow-through cuvette and a mini-computer for real-time data acquisition.
    • Analyzed bacterial growth data from both batch and chemostat cultures using specialized computer programs.

    Main Results:

    Related Experiment Videos

    • Bacterial growth did not conform to the Monod growth law under tested conditions.
    • Observed an abrupt change in the growth rate versus residual glucose concentration, suggesting a passive diffusion barrier preceding the uptake system.
    • Calculations indicated that outer membrane porin channels could explain the observed deviations from hyperbolic dependency.

    Conclusions:

    • The passive diffusion through outer membrane porins significantly influences Escherichia coli's glucose uptake kinetics.
    • Long-term chemostat culture induces adaptive changes in the bacteria, modifying outer membrane channels and cytoplasmic membrane uptake activity, leading to increased glucose concentration dependence.