The Gram stain, developed in 1884 by Hans Christian Gram, characterises bacteria based on the structural characteristics of their cell walls. The thick layers of peptidoglycan in the "Gram-positive" cell wall stain purple, while the thin "Gram-negative" cell wall appears pink. By combining morphology and Gram-staining, most bacteria can be classified as belonging to one of four groups (Gram-positive cocci, Gram-positive bacilli, Gram-negative cocci and Gram-negative bacilli). Some organisms are best identified by stains other than the Gram stain, particularly mycobacteria or Nocardia, which show acid-fastness on Ziehl–Neelsen or similar stains. Other organisms may need to be identified by their growth in special media, or by other techniques, such as serology.
The Gram stain , developed in 1884 by Hans Christian Gram , characterises bacteria based on the structural characteristics of their cell walls . The thick layers of peptidoglycan in the " Gram - positive " cell wall stain purple , while the thin " Gram - negative " cell wall appears pink . By combining morphology and Gram - staining , most bacteria can be classified as belonging to one of four groups ( Gram - positive cocci , Gram - positive bacilli , Gram - negative cocci and Gram - negative bacilli ) . Some organisms are best identified by stains other than the Gram stain , particularly mycobacteria or Nocardia , which show acid - fastness on Ziehl – Neelsen or similar stains . Other organisms may need to be identified by their growth in special media , or by other techniques , such as serology .
What color do Gram positive bacteria cell walls turn to after being stained?
What color do Gram positive bacteria cell walls turn to after being stained ?
purple
purple