refers to the inability of a microorganism to accept a certain stain. This inability is related to the cell wall composition of the microorganism and has been useful in classifying bacteria.
To describe a prokaryotic cell whose cell wall stains pink (negative) in Gram stain. The cell wall of a gram-negative bacterium contains relatively little peptidoglycan but contains an outer membrane composed of lipopolysaccharide (LPS), lipoprotein, and other complex macromolecules.
A term used to describe bacteria that turn pink when stained with Gram's stain.
bacteria staining red or pink in the Gram staining procedure after treatment with Gram's stain
(of bacteria) being or relating to a bacterium that does not retain the violet stain used in Gram's method
(alternatively, Gram-positive) - A negative (or positive) reaction to the standard Gram's stain for bacteria. Haploid - The chromosome number of the gametophytic generation or phase or having a single complete set of chromosomes.
refers to bacteria that have a thick double cell wall that contains lipopolysaccharide or endotoxin; these bacteria lose a violet stain when rinsed.
Gram-negative bacteria lose the crystal violet stain (and take the color of the red counterstain) in Gram’s method of staining.
Gram-negative bacteria are those that do not retain crystal violet dye in the Gram staining protocol. Gram-positive bacteria will retain the dark blue dye after an alcohol wash, whereas Gram-negative bacteria do not. In a Gram stain test, a counterstain is added after the crystal violet, which colors all Gram-negative bacteria a red or pink color.
