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. 1990 Apr;56(4):1164–1165. doi: 10.1128/aem.56.4.1164-1165.1990

Simplified Henry technique for initial recognition of Listeria colonies.

R V Lachica 1
PMCID: PMC184362  PMID: 2187403

Abstract

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.

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Selected References

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