Born 14 Mar 1854; died 20 Aug 1915 at age 61.
Paul Ralph Ehrlich is a German bacteriologist, hematologist and immunologist, and pioneering research in chemotherapy was the discovery of salvarsan (arsphenamine), the first effective treatment for syphilis against the spirochete Treponema pallidum. did. His research on blood histology was established with a specialty in hematology. Ehrlich has also developed a new staining method for microscopy of living tissue. At a time when little was known about the mechanism of bacterial infections, he proposed the side-chain theory as a chemical explanation of the body’s defenses against immunity and infection. Although generally wrong, the theory still stimulated further research on the problem. In 1908 he shared the Nobel Prize in Physiology or Medicine with Russian bacteriologist Elie Metchnikoff.