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3 in U.S. win chemistry Nobel for computer models

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STOCKHOLM — Three U.S.-based scientists won this year’s Nobel Prize in chemistry today for developing powerful computer models that researchers use to understand complex chemical interactions and create new drugs.

Research in the 1970s by Martin Karplus, Michael Levitt and Arieh Warshel has led to programs that unveil chemical processes such as how exhaust fumes are purified or how photosynthesis takes place in green leaves, the Royal Swedish Academy of Sciences said. That kind of knowledge makes it possible to find the b

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