gram-positivemedical dictionary

<microbiology> Bacteria that retain the stain or that are resistant to decolourisation by alcohol during Gram's method of staining.

This is a primary characteristic of bacteria whose cell wall is composed of a thick layer of peptidologlycan containing teichoic and lipoteichoic acid complexed to the peptidoglycan.

See: gram-negative

(06 Oct 1997)