Related Experiment Videos
Simplified Henry technique for initial recognition of Listeria colonies
1U. S. Army Natick Research, Development, and Engineering Center, Massachusetts 01760.
Applied and Environmental Microbiology
|April 1, 1990
Summary
A modified Henry oblique technique simplifies Listeria colony recognition. This method uses direct high-intensity lamp illumination and a hand lens for precise viewing of the colonies distinctive bluish cast.
Area of Science:
- Microbiology
- Bacteriology
Background:
- Accurate identification of bacterial colonies is crucial in microbiology.
- Listeria species possess a characteristic bluish cast under specific viewing conditions.
Purpose of the Study:
- To modify the Henry oblique transmitted-light viewing technique.
- To develop a more precise, convenient, and familiar method for reading and recognizing Listeria colonies.
Main Methods:
- Modification of the Henry oblique transmitted-light viewing technique.
- Direct illumination of each colony with a high-intensity lamp.
- Viewing colonies with a hand lens at a precise angle.
Main Results:
- The modified technique allows for easier and more accurate recognition of Listeria colonies.
- The distinct bluish cast of Listeria colonies is readily apparent with the simplified method.
- This approach replaces the need for a scanning light microscope for colony identification.
Conclusions:
- The simplified Henry oblique technique offers an improved method for Listeria colony identification.
- This technique enhances precision and convenience in routine microbiological diagnostics.
- The distinct visual characteristics of Listeria are effectively utilized for rapid presumptive identification.