Gram Stain |
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Gram-positive anthrax bacteria (purple rods) in cerebrospinal fluid sample. If present, a gram-negative bacterial species would appear pink. (The other cells are white blood cells) Gram staining (or the Gram's method) is an empirical method of differentiating bacterial species into two large groups (Gram-positive and Gram-negative) based on the chemical and physical properties of their cell walls. The method is named after its inventor, the Danish scientist Hans Christian Gram (1853– ...
Wikipedia - [full article]
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