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Related Experiment Video

Updated: Aug 12, 2025

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High Throughput Viability Assay for Microbiology.

Christian T Meyer1,2, Grace K Lynch1, Dana F Stamo2

  • 1BioFrontiers and MCDB Department, University of Colorado Boulder, Boulder, CO, USA.

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Summary

The Geometric Viability Assay (GVA) offers a faster, cheaper alternative to colony forming unit (CFU) counts for measuring cell viability. This new method simplifies complex experiments and accelerates microbial research.

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Area of Science:

  • Microbiology
  • Cell Biology
  • Biotechnology

Background:

  • Colony forming unit (CFU) assays are the standard for measuring cell viability but are time-consuming and resource-intensive.
  • Existing methods limit the scale and speed of microbial viability studies.

Approach:

  • The Geometric Viability Assay (GVA) was developed to replicate CFU measurements with significantly reduced time and consumables.
  • GVA determines viable cell counts by analyzing the growth distribution of embedded colonies within a pipette tip.

Key Points:

  • GVA is compatible with various microbial types, including planktonic bacteria, biofilms, and yeast.
  • It simplifies complex assays like checkerboard analyses, time-course studies, and drug screens.
  • The assay enabled the discovery of diphenyliodonium's ROS-mediated bactericidal mechanism in *E. coli*.

Conclusions:

  • GVA provides a rapid, cost-effective, and scalable method for assessing cell viability.
  • This assay can accelerate existing viability measurements and enable studies at unprecedented scales.