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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 ...
The Wyckoff positions are named after Ralph Wyckoff, an American X-ray crystallographer who authored several books in the field.His 1922 book, The Analytical Expression of the Results of the Theory of Space Groups, [3] contained tables with the positional coordinates, both general and special, permitted by the symmetry elements.
In X-ray crystallography, resolution is a measure of the resolvability or precision in the electron density map of a molecule. Resolution is usually reported in Angstroms (Å, 10 –10 meters) for X-ray crystal structures. The smaller the number, the better the degree of atomic resolution.
Pages in category "X-ray crystallography" The following 34 pages are in this category, out of 34 total. ... Code of Conduct; Developers; Statistics; Cookie statement;
Early demonstrations of isomorphous replacement in crystallography come from James M. Cork, [3] John Monteath Robertson, [4] and others. An early demonstration of isomorphous replacement in crystallography came in 1927 with a paper reporting the x-ray crystal structures of a series of alum compounds from Cork. [3]
In X-ray crystallography, a difference density map or Fo–Fc map shows the spatial distribution of the difference between the measured electron density of the crystal and the electron density explained by the current model. [1] A way to compute this map has been formulated for cryo-EM. [2]
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. [1]
Molecular replacement (MR) [1] is a method of solving the phase problem in X-ray crystallography.MR relies upon the existence of a previously solved protein structure which is similar to our unknown structure from which the diffraction data is derived.