Was discovered growing in a culture, and was found to kill certain organisms

Penicillium, the fungus that produces penicillin.

Explanation: Discovered by growing Fleming growing as a contaminant in a plate of S. Aureus bacteria and killing it

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the truman doctrine was an american foreign policy whose stated purpose was to counter soviet geopolitical expansion during the cold war. it was announced to congress by president harry s. truman on march 12, 1947, and further developed on july 12, 1948, when he pledged to contain threats to greece and turkey.