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Enhanced Reproducibility and Precision of High-Throughput Quantification of Bacterial Growth Data Using a Microplate Reader
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A new analysis method for evaluating bacterial growth with microplate readers.

Venkata Rao Krishnamurthi1, Isabelle I Niyonshuti2, Jingyi Chen2,3

  • 1Department of Physics, University of Arkansas, Fayetteville, AR, United States of America.

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|January 12, 2021
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Summary

This study introduces a novel method using time derivatives of optical density and fluorescence to accurately measure bacterial growth in microplate readers, overcoming scattering issues. The approach successfully analyzes bacterial responses to silver ions and nanoparticles, even when traditional methods fail.

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Area of Science:

  • Microbiology
  • Biophysics
  • Analytical Chemistry

Background:

  • Microplate readers offer high-throughput bacterial growth monitoring.
  • Multiple scattering in cultures hinders accurate optical density (OD) measurements.
  • Existing methods struggle with complex sample matrices and scattering effects.

Purpose of the Study:

  • To develop a robust method for evaluating bacterial growth using microplate readers.
  • To overcome limitations posed by multiple scattering in optical measurements.
  • To provide a framework for analyzing fluorescence (FL) growth curves.

Main Methods:

  • Utilized time derivatives of optical density (OD) and fluorescence (FL) measurements.
  • Employed quantitative models and numerical simulations to predict bacterial and fluorescent protein dynamics.
  • Applied the method to analyze bacterial lag time and growth inhibition by silver ions and nanoparticles.

Main Results:

  • The time derivative method accurately predicted bacterial and fluorescent protein growth dynamics.
  • Demonstrated successful analysis of bacterial lag time elongation induced by silver ions, corroborating Gompertz model fitting.
  • Successfully extracted bacterial growth behavior from FL measurements in the presence of silver nanoparticles (AgNPs) where OD measurements failed.

Conclusions:

  • The time derivative approach effectively overcomes scattering barriers in microplate reader-based growth curve analysis.
  • This method provides a reliable framework for understanding bacterial growth dynamics and responses to various treatments.
  • The technique enables accurate bacterial growth assessment even in challenging conditions, such as with AgNPs, where conventional OD readings are inadequate.