Born 18 Mar 1911; died 26 Nov 1991 at age 80.
American biochemist who pioneered the usage of radioactive and solid isotopes to hint chemical pathways via way of means of which the frame creates its very own materials, consisting of blood. He observed the metabolic pathway via way of means of which the mobileular synthesizes heme (the purple substance in haemoglobin), nutrition B-12 and associated compounds. In 1946, with David Rittenberg, to research the direction of glycine withinside the frame, he ingested glycine labelled with atoms of the solid isotope nitrogen-15, and his blood turned into analyzed for merchandise containing the tracer atoms. Hence they located glycine is used to synthesize the pyrrole earrings of protoporphyrin. Further, he located that purple blood cells had a lifespan of approximately 127 days, which brought about expertise sure purple blood mobileular diseases. He persisted to have a look at the mechanism of the middleman metabolism of amino acids.