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 ?
Meningococcal disease is an infection of the blood caused by the gram-negative bacterium Neisseria meningitidis, and is one of the few diseases that can kill an otherwise healthy child within hours.
Liu and his coworkers inserted two Bs genes into the gram-negative bacterium Asticcacaulis excentricus, causing it to produce one of the three Bs poisons.
Meningococcemia is an infection of the blood caused by the gram-negative bacterium Neisseria meningitides, and is one of the few diseases that can kill an otherwise healthy child within hours.

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