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Related Experiment Videos

Automatic procedures for measuring post-antibiotic effect and determining random errors

A C Jason1, F M MacKenzie, D Jason

  • 1Department of Medical Microbiology, Aberdeen Royal Infirmary, Robert Gordon University, UK.

The Journal of Antimicrobial Chemotherapy
|November 1, 1994
PubMed
Summary
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This study introduces four automated methods for measuring the post-antibiotic effect (PAE) in bacterial growth using conductance. The peak growth rate method offers superior resolution, suggesting PAE is primarily due to prolonged lag time.

Area of Science:

  • Microbiology
  • Bacteriology
  • Pharmacology

Background:

  • The post-antibiotic effect (PAE) is crucial for understanding antibiotic efficacy.
  • Accurate measurement of PAE is essential for optimizing antimicrobial therapy.
  • Current PAE determination methods can be time-consuming and lack precision.

Purpose of the Study:

  • To develop and validate automated methods for determining the post-antibiotic effect (PAE).
  • To assess the time resolution and accuracy of different PAE measurement techniques.
  • To investigate the underlying mechanisms contributing to the post-antibiotic effect.

Main Methods:

  • Utilized high-resolution conductance measurements for bacterial growth monitoring.
  • Developed four distinct automated methods for PAE determination.

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  • Employed statistical procedures to calculate random errors and assess time resolution.
  • Applied methods to Escherichia coli NCTC 4174 cultures exposed to various antibiotic concentrations.

    • Main Results:

    • Demonstrated excellent agreement between three of the four automated PAE determination methods.
    • Identified the method based on peak growth rate determination as providing superior time resolution.
    • Showcased that PAE can be accurately ascribed to a prolongation of the lag time in bacterial growth.

    Conclusions:

    • Automated conductance measurements offer a robust approach for PAE determination.
    • The peak growth rate method provides the highest resolution for PAE assessment.
    • Findings suggest that the primary mechanism of post-antibiotic effect is the extension of the lag phase.