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.

Histochemical evidence for lipopolysaccharide (endotoxin) in eukaryotes

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.

Bacterial bad guys: ranking the threat of six common microbes. (Science Selections)

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.

Staging germ warfare in foods: science harnesses bacteria to fend off food poisoning and spoilage