Three Historical Figures

This essay has a total of 376 words and 3 pages.

Three historical figures




Biographical Sketch of James Dewey Watson
James D. Watson is best known for his discovery of the structure of DNA (deoxyribonucleic acid), for which he shared with Francis Crick and Maurice Wilkins the 1962 Nobel Prize in Physiology or Medicine. They proposed that the DNA molecule takes the shape of a double helix, an elegantly simple structure that resembles a gently twisted ladder. The rails of the ladder are made of alternating units of phosphate and the sugar deoxyribose; the rungs are each composed of a pair of nitrogen-containing nucleotides.


Salk, Jonas (Edward) 1914 -- 1995
Immunologist; born in New York City. He began his pathbreaking studies on viruses and immunization by starting with the influenza virus while at the University of Michigan (1942--47). At the University of Pittsburgh (1947--63) he developed the first vaccination against poliomyelitis, a killed-virus vaccine, introduced to the public in 1953. (By 1961, and after some resistance, Albert Sabin's simpler and stronger live-virus oral vaccine had supplanted Salk's injectable vaccine in the United States; Salk's vaccine is now used only in a few countries around the world.) He is the founder/director (1963)

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