France's Yves Chauvin and Americans Robert H Grubbs and Richard R Schrock have won the 2005 Nobel Prize in Chemistry.
The trio won the award for their development of the metathesis method in organic synthesis.
Grubbs, 63, is a professor of chemistry at the California Institute of Technology, and Schrock is a chemistry professor at the Massachusetts Institute of Technology.
The three men share the US $1.3 million award, which will be presented on December 10 in the Swedish capital.
On Tuesday, Americans John L Hall and Roy J Glauber and German Theodor W Haensch won the 2005 Nobel Prize in Physics for their work in advancing the precision of optic technology, which could improve communication worldwide and help spacecraft navigate more accurately to the stars.
The prize was given to the three for their work in applying modern quantum physics to the study of optics -- a pursuit that has led to the improvement of lasers, optical clocks, GPS technology and other instruments.
On Monday, Australians Barry J Marshall and Robin Warren won the 2005 Nobel Prize in Physiology or Medicine for proving, partly by accident, that bacteria and not stress was the main cause of painful ulcers of the stomach and intestine.
The award for peace will be announced on Friday in the Norwegian capital, Oslo. The Economics prize, the only one not named in Nobel's will, will be announced on October 10.
So far, the Swedish Academy, which awards the literature prize, has not yet set a date for its announcement, meaning the award could be announced next week.
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