sep 28, 1928 - Penicillin as an antibiotic discovered by Alexander Fleming
Description:
"In his laboratory, Fleming noticed a Petri dish containing Staphylococci that had been mistakenly left open was contaminated by blue-green mold from an open window, which formed a visible growth. There was a halo of inhibited bacterial growth around the mold. Fleming concluded that the mold released a substance that repressed the growth and caused lysing of the bacteria."
Souce: https://en.wikipedia.org/wiki/Penicillin
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