Karl Landsteiner Who in American Jewry", stating that "it will be detrimental to me to emphasize publicly the religion of my ancestors." Karl Landsteiner Karl Landsteiner, , (14 June 1868 – 26 June 1943) was an Austrian biologist, physician, and immunologist. He distinguished the main blood groups in 1900, having developed the modern system of classification of blood groups from his identification of the presence of agglutinins in the blood, and identified, with Alexander S. Wiener, the Rhesus factor, in 1937, thus enabling physicians to transfuse blood without endangering the patient's life. With Constantin Levaditi and Erwin Popper, he discovered the polio
Nobel Prize in Physiology or Medicine US$1.4 million). Rita Levi-Montalcini, an Italian neurologist, who together with colleague Stanley Cohen, received the 1986 Nobel Prize in Physiology or Medicine for their discovery of Nerve growth factor (NGF), was the first Nobel laureate to reach the 100th birthday. Because of the length of time that may pass before the significance of a discovery becomes apparent, some prizes are awarded many years after the initial discovery. Barbara McClintock made her discoveries in 1944, before the structure of the DNA molecule was known; she was not awarded the prize until 1983. Similarly, in 1916 Peyton Rous discovered the role of