Warshel, talking about the use of computer programs, told reporters in Stockholm by phone link: "It's like seeing a watch and wondering how it actually works.
"You can use it to design drugs, or in my case, to satisfy your curiosity."
Karplus, a US and Austrian citizen, carries out research at the University of Strasbourg and Harvard University. Levitt, a US and British citizen, is at Stanford University School of Medicine.
Warshel, a US and Israeli citizen, is a professor at the University of Southern California, Los Angeles.
"It has revolutionized chemistry," Kersti Hermansson, a professor in organic chemistry at Uppsala University, said of the computer modeling.
"When you solve equations on the computer, you obtain information that is of such detail it is almost impossible to get it from any other method. ... You can really follow like a movie, in time and in space. This is fantastic detail.
"With that knowledge you can solve problems, determine why things happen - energy problems, corrosion, chemical reactions, materials, why the properties are how they are and how you could improve them to design better materials."
About the broadcaster:
Lance Crayon is a videographer and editor with China Daily. Since living in Beijing he has worked for China Radio International (CRI) and Global Times. Before moving to China he worked in the film industry in Los Angeles as a talent agent and producer. He has a B.A. in English from the University of Texas at Arlington.
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