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Related Experiment Videos

Hydrodynamic focusing and electronic cell-sizing techniques.

M L Shuler1, R Aris, H M Tsuchiya

  • 1Department of Microbiology, University of Minnesota, Minneapolis, Minnesota 55455.

Applied Microbiology
|September 1, 1972
PubMed
Summary
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Hydrodynamic focusing enhances Coulter counter resolution for precise bacterial sizing. This technique accurately measures both single and mixed bacterial populations, improving particle analysis.

Area of Science:

  • Microbiology
  • Biophysical techniques
  • Analytical chemistry

Background:

  • The Coulter counter is a widely used instrument for particle sizing.
  • Improving the resolution of the Coulter counter is crucial for accurate bacterial sizing.
  • Hydrodynamic focusing is a technique that can potentially enhance particle analysis.

Purpose of the Study:

  • To examine the effectiveness of hydrodynamic focusing for improving Coulter counter resolution in bacterial sizing.
  • To characterize the performance of the Coulter counter with and without hydrodynamic focusing.
  • To evaluate the system's capability in sizing both single and mixed bacterial populations.

Main Methods:

  • Utilized latex particles ranging from 0.26 to 6.7 micrometers in volume to calibrate and test the system.

Related Experiment Videos

  • Performed particle sizing experiments with the Coulter counter under conditions with and without hydrodynamic focusing.
  • Assessed the system's performance on well-defined latex particles and subsequently on bacterial samples.

    • Main Results:

    • Hydrodynamic focusing significantly improved the resolution of the Coulter counter for particle sizing.
    • The system demonstrated accurate sizing capabilities for both uniform and mixed bacterial populations.
    • Consistent results were obtained across different particle sizes and population types.

    Conclusions:

    • Hydrodynamic focusing is a valuable technique for enhancing the precision of bacterial sizing using Coulter counters.
    • The optimized system is suitable for analyzing complex microbial communities.
    • Potential applications include microbial diagnostics and environmental monitoring.