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Quantifying Microorganisms at Low Concentrations Using Digital Holographic Microscopy DHM
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Quantifying Microorganisms at Low Concentrations Using Digital Holographic Microscopy (DHM).

Manuel Bedrossian1, Casey Barr2, Chris A Lindensmith3

  • 1Department of Medical Engineering, California Institute of Technology.

Journal of Visualized Experiments : Jove
|November 21, 2017
PubMed
Summary
This summary is machine-generated.

This study introduces a low-cost digital holographic microscopy (DHM) method for rapid bacterial detection. The technique accurately counts sparse bacterial samples in dilute cultures, offering a faster alternative to traditional methods.

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Area of Science:

  • Microbiology
  • Optical Physics
  • Biotechnology

Background:

  • Accurate bacterial enumeration is crucial for food safety, medical diagnostics, and astrobiology.
  • Current methods like culture plating and epifluorescence microscopy have limitations, including long incubation times and complex sample preparation.

Purpose of the Study:

  • To demonstrate the efficacy of off-axis digital holographic microscopy (DHM) for enumerating bacteria in dilute cultures.
  • To provide instructions for building a low-cost DHM instrument.

Main Methods:

  • Construction and principles of a custom off-axis digital holographic microscope.
  • Application of a statistical model to determine optimal video recording duration for cell detection.
  • Real-time video detection of bacteria at concentrations ranging from 100 to 10^5 cells/mL using un-reconstructed holograms.
  • Reconstruction of amplitude and phase images using open-source software.

Main Results:

  • Successful real-time detection and enumeration of bacteria in dilute cultures (100-10^4 cells/mL).
  • Demonstration of bacterial detection at various concentrations (10^5, 10^4, 10^3, and 100 cells/mL).
  • Successful reconstruction of amplitude and phase images from holographic data.

Conclusions:

  • Off-axis DHM offers a rapid and cost-effective method for detecting and counting sparse bacterial samples.
  • The developed DHM system and methodology can be applied in various fields, including industrial processing, medical diagnostics, and space exploration.