Simplified Henry technique for initial recognition of Listeria colonies.
The Henry oblique transmitted-light viewing technique was modified to provide a more precise, convenient, and familiar manner with which to read (score) and recognize colonies of listeriae by their distinct bluish cast. The simplified technique involved illuminating each colony directly with a high-intensity lamp while viewing it with a hand lens at a precise angle in place of a scanning light microscope.
U. S. Army Natick Research, Development, and Engineering Center, Massachusetts 01760.
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D001431:Bacteriological Techniques; D005506:Food Contamination; D005516:Food Microbiology; D008087:Listeria / Q000166:cytology / Q000302:isolation & purification*; D008853:Microscopy / Q000379:methods*