Karl Landsteiner 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 virus in 1909. He received the Aronson Prize in 1926. In 1930, he received the Nobel Prize in Physiology or
Nobel Prize controversies article describing the subatomic particle meson pi (pion). Lattes was solely responsible for the improvement of the nuclear emulsion used by Powell (by asking Kodak Co. to add more boron to it—and in 1947, he made with them his great experimental discovery). This result was explained by the Nobel Committee policy (ended in 1960) to award the prize to the research group head only. Lattes calculated the pion's mass and, with USA physicist Eugene Gardner, demonstrated the existence of this particle after atomic collisions in a synchrotron. Gardner was denied a prize because he died soon thereafter. The 1938 prize