Death of Vincent du Vigneaud (American biochemist), December 11. Vincent du Vigneaud was a prominent figure in twentieth-century biochemistry, renowned for his research on the synthesis and structure of hormones. In 1955, he was awarded the Nobel Prize in Chemistry for his discovery and synthesis of the hormone oxytocin. This scientific achievement played a significant role in advancing biochemical and medical knowledge, enabling the industrial production of this hormone. Throughout his career, du Vigneaud published over 200 scientific papers and mentored many students. His research on peptides and proteins expanded the frontiers of biochemistry and inspired subsequent generations of scientists. He also contributed to the development of new organic chemistry methods for studying biological compounds. Du Vigneaud’s death on December 11, 1978, marked the end of the life of one of the most influential scientists of his era. His legacy and achievements continue to be recognized in academic and scientific circles, and his work holds a special place in biochemistry education and research. This event was included in the 1978 Gregorian calendar to commemorate the global scientific importance of Vincent du Vigneaud’s contributions and to ensure his role in the advancement of biochemistry is remembered.