On this day 122 years ago, on February 9, 1903 (January 12, 1903 lunar calendar), the Swedish medical scientist Theorel was born. On February 9, 1903, the Swedish medical scientist Theorel was born in Lin Kaibin. Theorel studied bacteriology at the Institut Pasteur in France in 1924 and taught at the University of Uppsala in 1932. His main contribution was to the study of oxidases, which elucidated the basic structure and function of enzymes, and for this he was awarded the Nobel Prize in Physiology and Medicine in 1955.