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Multi-wavelength anomalous diffraction (sometimes Multi-wavelength anomalous dispersion; abbreviated MAD) is a technique used in X-ray crystallography that facilitates the determination of the three-dimensional structure of biological macromolecules (e.g. DNA, drug receptors) via solution of the phase problem.
X-ray crystallography is still the primary method for characterizing the atomic structure of materials and in differentiating materials that appear similar in other experiments. X-ray crystal structures can also help explain unusual electronic or elastic properties of a material, shed light on chemical interactions and processes, or serve as ...
X-ray crystallography is not common for nucleic acids alone, since neither DNA nor RNA readily form crystals. This is due to the greater degree of intrinsic disorder and dynamism in nucleic acid structures and the negatively charged (deoxy)ribose-phosphate backbones, which repel each other in close proximity.
X-ray scattering; Keto-enol tautomerism#DNA, the final key insight, from a Pauling collaborator, that the textbooks of the time were wrong, that led to the solved structure; Avery-MacLeod-McCarty experiment, the first demonstration that DNA was likely to be the genetic material; Chargaff's rules, which showed that A:T and G:C occurred in equal ...
Left, the major steps involved in DNA structure determination by X-ray crystallography showing the important role played by molecular models of DNA structure in this iterative process. Right, an image of actual A- and B- DNA X-ray patterns obtained from oriented and hydrated DNA fibers (courtesy of Dr. Herbert R. Wilson, FRS- see refs. list).
This is an accepted version of this page This is the latest accepted revision, reviewed on 26 January 2025. British X-ray crystallographer (1920–1958) This article is about the chemist. For the Mars rover named after her, see Rosalind Franklin (rover). Rosalind Franklin Franklin with a microscope in 1955 Born Rosalind Elsie Franklin (1920-07-25) 25 July 1920 Notting Hill, London, England ...
Photo 51 is an X-ray based fiber diffraction image of a paracrystalline gel composed of DNA fiber [1] taken by Raymond Gosling, [2] [3] a postgraduate student working under the supervision of Maurice Wilkins and Rosalind Franklin at King's College London, while working in Sir John Randall's group.
Using X-ray crystallography, the structure of DNA was discovered by James Watson and Francis Crick with the help of previously documented experimental evidence by Maurice Wilkins and Rosalind Franklin. [9] Knowledge of the structure of DNA led scientists to examine the nature of genetic coding and, in turn, understand the process of protein ...