medicinenotes:Gram staining (or Gram’s method) is a method of differentiating bacterial species into
medicinenotes:Gram staining (or Gram’s method) is a method of differentiating bacterial species into two large groups (Gram-positive and Gram-negative).It is based on the chemical and physical properties of their cell walls. Primarily, it detects peptidoglycan, which is present in a thick layer in Gram positive bacteria.A Gram positive results in a purple/blue color while a Gram negative results in a pink/red color.The Gram stain is almost always the first step in the identification of a bacterial organism, and is the default stain performed by laboratories over a sample when no specific culture is referred. -- source link
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