On this day in 1935 John James Rickard Macleod passed away in Aberdeen.

Mcleod was a Scottish biochemist and physiologist. He devoted his career to diverse topics in physiology and biochemistry, but was chiefly interested in carbohydrate metabolism. He is noted for his role in the discovery and isolation of insulin during his tenure as a lecturer at the University of Toronto, for which he and Frederick Banting received the 1923 Nobel prize in Physiology or Medicine.

John Macleod was a distinguished physiologist even before the discovery of insulin. He was elected a member of the Royal Society of Canada in 1919 and president of American Physiological Society in 1921. In 1923, Macleod was awarded the Cameron Prize for Therapeutics of the University of Edinburgh. Among the recognitions he received after 1923 were memberships of the Royal Society and the Royal Society of Edinburgh, corresponding membership of the German Academy of Sciences Leopoldina and honorary membership of the Regia Accademia Medica.[
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