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Deoxyribonucleic Acid

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Watson and Crick with their DNA model Featured DNA Image

Watson and Crick with their DNA model

COMMERCIAL USE REQUIRES CLEARANCE. The discoverers of the structure of DNA. James Watson (b.1928) at left and Francis Crick (1916-2004), with their model of part of a DNA molecule in 1953. Crick & Watson met at the Cavendish Laboratory, Cambridge, in 1951. Their work on the structure of DNA was performed with a knowledge of Chargaff's ratios of the bases in DNA and some access to the X-ray crystallography of Maurice Wilkins and Rosalind Franklin at King's College London. Combining all of this work led to the deduction that DNA exists as a double helix. Crick, Watson and Wilkins shared the 1962 Nobel Prize for Physiology or Medicine, Franklin having died of cancer in 1958. Photographed in the Cavendish Laboratory, University of Cambridge, UK, in May 1953


Blood spatter analysis Featured DNA Image

Blood spatter analysis

Blood spatter analysis. Bloodstain on a surfacesurrounded by scale bars. Bloodstain patterns areanalysed to help investigators determine: theorigin on the body, the weapon used and the numberof blows, the relative position of the victim andassailant and the sequence of events. In impactpatterns, the length and width of each drop ismeasured and the angle at which they struck thesurface calculated. This indicates the directionthe blood was travelling in and the speed at whichit travelled. The convergence point of the dropsindicates the location of the victim. The densestain alignment in this pattern indicates that thesite of impact on the victim was in closeproximity with the surface. The black arrowindicates the area where a DNA swab would be taken

© Jim Varney/Science Photo Library

Francis Harry Compton Crick, British microbiologist, c1962 Featured DNA Image

Francis Harry Compton Crick, British microbiologist, c1962

Francis Harry Compton Crick, British microbiologist, c1962. Francis Crick (1916-2004) discovered the molecular structure of DNA. He shared the 1962 Nobel prize for physiology or medicine with James Dewey Watson and Maurice Wilkins. The citation read for further discoveries concerning the molecular structure of nucleic acids and their significance for information transfer in living materials. Photograph courtesy of the Nobel Foundation. (Colorised black and white print)

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