Edward Adelbert Doisy

Edward Adelbert Doisy (1893–1986) was an American biochemist who isolated vitamin K and shared the 1943 Nobel Prize in Physiology or Medicine with Henrik Dam.

Henrik Dam: Henrik Dam was a Danish biochemist who discovered vitamin K and shared the 1943 Nobel Prize in Physiology or Medicine. Dam independently identified the vitamin whose isolation Doisy later achieved.
Vitamin K: Vitamin K is a group of fat-soluble compounds required for blood clotting and other biological processes. Doisy isolated and characterized the vitamin after Dam identified its role in coagulation.
Vitamin K deficiency: Vitamin K deficiency is a shortage of vitamin K that can impair blood clotting and cause bleeding. Dam’s observations of deficiency in chicks prompted the search for the missing dietary factor.
Vitamin K antagonist: A vitamin K antagonist is a substance that interferes with vitamin K-dependent processes, especially coagulation. The discovery made it possible to understand and develop drugs that oppose vitamin K action.
Charles Glen King: Charles Glen King was an American biochemist whose laboratory isolated vitamin C in 1932. King’s vitamin C work illustrates the competing research race that surrounded vitamin discoveries.
Blood coagulation: Blood coagulation is the process by which blood forms a clot to limit bleeding. The vitamin K deficiency studied by Dam disrupted this process.
Danish brown algae: Danish brown algae are marine plants studied as a possible source of vitamin K activity. Doisy’s group extracted vitamin K activity from alfalfa and fish meal, while algae featured in early investigations.
Newborn vitamin K deficiency bleeding: Newborn vitamin K deficiency bleeding is a potentially severe bleeding disorder caused by low vitamin K in infants. Recognition of vitamin K’s role in coagulation underlies preventive vitamin K administration to newborns.
Nobel Prize in Physiology or Medicine: The Nobel Prize in Physiology or Medicine recognizes discoveries in medicine and the life sciences. The 1943 award recognized Doisy and Dam’s work on vitamin K.
Prothrombin: Prothrombin is a blood-plasma protein converted into thrombin during coagulation. Vitamin K is required for the liver to produce functional prothrombin.

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