George Wells Beadle and Edward Lawrie Tatum publish "Genetic Control of Biochemical Reactions in Neurospora" which shows that specific genes code for specific proteins.
John William Field develops Field stain to detect malarial parasites.
May 12 – German engineer Konrad Zuse presents the Z3, the world's first working programmable, Turing complete, fully automatic computer, to an audience of aviation engineers in Berlin.
February 12 – Reserve Constable Albert Alexander, a sepsis patient at the Radcliffe Infirmary in Oxford, becomes the first person treated with penicillin intravenously, by Howard Florey's team, injected by Dr Charles Fletcher. He reacts positively but there is insufficient supply of the drug to reverse his terminal infection. A successful treatment is achieved during May.
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