Alexander (Alec) Rawson Stokes, (27 June 1919 Macclesfield - 5 February 2003) was a co-author of one [1] of the three papers published sequentially in Nature in March 1953 [2] announcing the presumed molecular structure of DNA. The first was authored by Francis Crick and James Watson [3], and the third by Rosalind Franklin and Raymond Gosling [4]. The Nobel Prize in Medicine was awarded in 1962 to Crick, Watson and Wilkins for this work. In 1993, on the 40th anniversary of the publication of the molecular structure of DNA, a plaque was erected in the Quad (courtyard) of the Strand campus of King's College London commemorating the contributions of Franklin, Gosling, Stokes, Wilson and Wilkins to DNA X-ray diffraction studies.
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He received a first-class degree in the natural science tripos in 1940 at Trinity College Cambridge and then researched X-ray crystallography of Imperfect Crystals for his PhD in 1943 at the Cavendish Laboratory. He lectured in physics at Royal Holloway College, London before joining John Randall's Biophysics Research Unit at King's College London in 1947. He has been credited[5] as being the first person to demonstrate that the DNA molecule was probably helical in shape. Maurice Wilkins wrote in his autobiography (page 160) [6] that he asked Stokes to predict what a helical structure would look like as an x-ray diffraction photograph, and that he was able to determine this by the next day through mathematical calculations made during a short train journey. Stokes continued to work on optical diffraction in large biological molecules. His publications include the books The Theory of the Optical Properties of Inhomogeneous Materials. London: E. and F.N. Spon Ltd, (1963) and The Principles of Atomic and Nuclear Physics C.J. Smith and A.R. Stokes, London, Edward Arnold, (1972) ISBN 0-7131-2313-3.
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