The latest articles related to Crystallography
X-ray crystallography has led to a better understanding of chemical bonds and non-covalent interactions. The initial studies revealed the typical radii of atoms, and confirmed many theoretical models of chemical bonding, such as the tetrahedral bonding of carbon in the diamond structure, the octahedral bonding of metals observed in ammonium hexachloroplatinate (IV), and the resonance [...]
In crystallography, a screw axis is a symmetry operation describing how a combination of rotation about an axis and a translation parallel to that axis leaves a crystal unchanged. Screw axes are noted by a number, ”n”, where the angle of rotation is 360°/”n”. The degree of translation is then added as a subscript showing [...]
Early scientific history of crystals and X-rays X-rays were discovered by Wilhelm Conrad Röntgen in 1895, just as the studies of crystal symmetry were being concluded. Physicists were initially uncertain of the nature of X-rays, although it was soon suspected (correctly) that they were waves of electromagnetic radiation, in other words, another form of light. [...]
The process was first proposed by UCLA structural biologist Todd Yeates in 1995, who suggested that a racemic mixture of proteins would crystallize more readily than each component alone. The process of mixing proteins made of D-amino acids with the more readily available L-amino acid-containing proteins appears straightforward, but it took a decade to overcome [...]
*William Barlow *John Desmond Bernal *William Henry Bragg *William Lawrence Bragg *Auguste Bravais *Martin Julian Buerger *Francis Crick *Pierre Curie *Peter Debye *Boris Delone *Paul Peter Ewald *Evgraf Stepanovich Fedorov *Rosalind Franklin *Georges Friedel *Paul Heinrich von Groth *René Just Haüy *Carl Hermann *Johann Friedrich Christian Hessel *Dorothy Crowfoot Hodgkin *Robert Huber *Aaron Klug *Max [...]
Elastic vs. inelastic scattering X-ray crystallography is a form of elastic scattering; the outgoing X-rays have the same energy, and thus same wavelength, as the incoming X-rays, only with altered direction. By contrast, ”inelastic scattering” occurs when energy is transferred from the incoming X-ray to the crystal, e.g., by exciting an inner-shell electron to a [...]
Cryo crystallography enables X-ray data collection at cryogenic, near liquid temperatures (also called: N2). #Crystals are transferred from mother liquor to a hydrocarbon environment #Crystals are mounted with a glass fiber (as opposed to a capillary) #Crystals are cooled with a cold nitrogen stream on a diffraction apparatus to prevent the solvent freezing in the [...]
Crystallography is the experimental science of determining the arrangement of atoms in solids. The word “crystallography” is derived from the Greek words ”crystallon” = cold drop / frozen drop, with its meaning extending to all solids with some degree of transparency, and ”grapho” = write. Before the development of X-ray diffraction crystallography (see below), the [...]
Cosmic Crystallography is a technique used in physics and astronomy to determine the possible topology of the universe (eg. a torus, 3-sphere, etc.). astronomers observe sources of high redshift and look for repeating patterns that may indicate the connection of edges.Adapted from the Wikipedia article Cosmic crystallography, under the G. N. U. Free Documentation License. [...]
*Coordinates in ”square brackets” such as [100] denote a direction vector (in real space). *Coordinates in ”angle brackets” or ”chevrons” such as denote a ”family” of directions which are related by symmetry operations. In the cubic crystal system for example, would mean [100], [010], [001] or the negative of any of those directions. *Miller indices [...]
Cryo bio-crystallography is the application of crystallography at cryogenic temperatures. Adapted from the Wikipedia article Cryo bio-crystallography, under the G. N. U. Free Documentation License. Please also see http://en.wikipedia.org/wiki
A series of lectures and handout notes given by Dr. Cora Lind for her Chem 4980/6850/8850: X-ray Crystallography course at the University of Toledo (Ohio)....
A series of lectures and handout notes given by Dr. Cora Lind for her Chem 4980/6850/8850: X-ray Crystallography course at the University of Toledo (Ohio)....
A series of lectures and handout notes given by Dr. Cora Lind for her Chem 4980/6850/8850: X-ray Crystallography course at the University of Toledo (Ohio)....
