GRAM POSITIVE/NEGATIVE BACTERIA -
Noun: Bacteria are categorised into Gram Positive and Gram Negative. The bacteria is first stained with a violet dye and then treated with Gram's iodine solution and then washed with alcohol. Gram-positive bacteria retain the violet dye; Gram-negative bacteria species lose it. Some antibiotics are more effective at handling Gram-positive bacteria and some antibiotics are more effective on Gram-negative bacteria.

Hans C. J. Gram, 1853 - 1938, a Danish bacteriologist, who discovered it.

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