noun
gram-negative bacteria
Technical term in microbiology; refers to bacteria that do not retain the crystal violet stain in the Gram staining method.
グラム陰性菌は抗生物質に耐性を持つことがある。
Gram-negative bacteria can be resistant to antibiotics.
Gram-positive bacteria, which retain the crystal violet stain and appear purple under a microscope, in contrast to gram-negative bacteria which appear pink or red.
From グラム (Gram, after Hans Christian Gram) + 陰性 (negative) + 菌 (bacterium).