Gram negative bacteria
This is because the structure of their cell wall is unable to retain the crystal violet stain so are colored only by the safranin counterstain. Examples of Gram negative bacteria include enterococci, salmonella species and pseudomonas species.
What is unique about Gram negative bacteria?
Gram-negative bacteria have a characteristic cell envelope structure very different from Gram-positive bacteria. Gram-negative bacteria have a cytoplasmic membrane, a thin peptidoglycan layer, and an outer membrane containing lipopolysaccharide.
Why is it important to know if bacteria is Gram positive or negative?
The main benefit of a gram stain is that it helps your doctor learn if you have a bacterial infection, and it determines what type of bacteria are causing it. This can help your doctor determine an effective treatment plan.
