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Sir Alexander (1881–1955). Scottish bacteriologist and discoverer of penicillin. He was born at Lochfield in Scotland and served as a captain in the army medical corps during World War I. The first result of his search for an antibacterial substance that would not be toxic to human tissue was the discovery of lysozyme, but his epochal discovery was of penicillin in 1938. In 1943 he was made fellow of the Royal Society, was knighted and given the John Scott medal in 1944, and was awarded the Nobel prize in 1945.
Sir Alexander, Scottish bacteriologist, 1881-1955, co-winner of the 1945 Nobel prize for the discovery of penicillin.