Sir Ernst Boris Chain

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Noun1.Sir Ernst Boris Chain - British biochemist (born in Germany) who isolated and purified penicillin, which had been discovered in 1928 by Sir Alexander Fleming (1906-1979)
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Penicillin was discovered in 1928 by Alexander Fleming but it wasn't until 1938 that Howard Florey and Ernst Chain found a way to produce it.
In 1942 Nobel Laureate Ernst Chain wrote explicitly that his discovery (with Florey and Fleming) of penicillin, and the development of bacterial resistance to that antibiotic, owed nothing to Darwin's and Alfred Wallace's evolutionary theories.
After Fleming's discovery, it took twelve years before two other scientists, Howard Florey and Ernst Chain, figured out how to make penicillin in a way that could help people.