He was 85.
Photosynthesis is the process by which plants capture energy from the sun.
It is a sad occasion to lose such a colleague. Calvin, who won the Nobel Prize in chemistry in 1961, was a University Professor of Chemistry. His findings sparked the U.S. Department of Energy's interest in solar energy as a source of power. He showed converting energy from the sun into useful forms was scientifically possible. Berkeley Nobelist Glenn T. Seaborg said Calvin was a life-long friend.