Ochoa, Severo sāvā´rō ōchō´ä [key], 1905–93, American biochemist and educator, b. Spain, M.D. Univ. of Madrid, 1929. After teaching at the universities of Madrid, Heidelberg, and Oxford, he came to the United States in 1940. In 1954 he was appointed chairman of the department of biochemistry at New York Univ. He became an American citizen in 1956. With Arthur Kornberg he received the 1959 Nobel Prize in Physiology or Medicine for the synthesis of ribonucleic acid (RNA), an organic compound that carries hereditary qualities in all reproduction.
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