gram-negative

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Related to Gram-negative bacterium: Gram positive bacterium

gram-negative

[′gram¦neg·əd·iv]
(microbiology)
Of bacteria, decolorizing and staining with the counterstain when treated with Gram's stain.
References in periodicals archive ?
Our positive control, the gram-negative bacterium Escherichia coli, showed staining of the surface with both agents.
The gram-positive bacteria Streptomyces californicus and Bacillus cereus are known inhabitants of water-damaged buildings, and the gram-negative bacterium Pseudomonas fluorescens is found in many indoor and outdoor environments.
Without significant modifications, bacteriocins from gram-positive bacteria--the only ones now being explored for use in food--usually cannot breach a gram-negative bacterium's outer coat.

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