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crystallography

His earlier papers were mostly concerned with crystallography, and the reputation they gained him led to his appointment as Privatdozent at Konigsberg, where in 1828 he became extraordinary, and in 1829 ordinary, professor of mineralogy and physics.

10a point which divides a line, or a line which divides an angle, into two equal parts; in crystallography it denotes the bisector of the angle between the optic axes.

11a point which divides a line, or a line which divides an angle, into two equal parts; in crystallography it denotes the bisector of the angle between the optic axes.

12The development of the theory of crystal structure, and the fundamental principles on which is based the classification of crystal forms, are treated in the article Crystallography; in the same place will be found an account of the doctrine of isomorphism, polymorphism and morphotropy.

00In the article Crystallography the nature and behaviour of twinned crystals receives full treatment; here it is sufficient to say that when the planes and axes of twinning are planes and axes of symmetry, a twin would exhibit higher symmetry (but remain in the same crystal system) than the primary crystal; and, also, if a crystal approximates in its axial constants to 'a higher system, mimetic twinning would increase the approximation, and the crystal would be pseudo-symmetric.

00For a detailed comparison of the isomorphous relations of the elements the reader is referred to P. von Groth, Chemical Crystallography.

00The great French chemist, Dumas, gives him the credit for the first attempt to establish a system of crystallography.

00The mensuration of the cube, and its relations to other geometrical solids are treated in the article Polyhedron; in the same article are treated the Archimedean solids, the truncated and snubcube; reference should be made to the article Crystallography for its significance as a crystal form.

00Octahedra having triangular faces other than equilateral occur as crystal forms. See Polyhedron and Crystallography.

00Bevelment, as a term of crystallography, means the replacement of an edge of a crystal by two planes equally inclined to the adjacent planes.

00in crystallography as " twins."

00In crystallography, the regular or ordinary dodecahedron is an impossible form since the faces cut the axes in irrational ratios; the "pentagonal dodecahedron" of crystallographers has irregular pentagons for faces, while the geometrical solid, on the other hand, has regular ones.

00Many other dodecahedra exist as crystal forms, for which see Crystallography.

00Hemihedral forms are of special importance in crystallography, to which article the reader is referred for a fuller explanation of these and other modifications of polyhedra (tetartohedral, enantiotropic, &c.).

00(Reference should be made to the article Crystallography for illustrations, and for applications of these phenomena to the determination of crystal form.) With an uniaxal plate perpendicular to the optic axis, the curves of constant retardation are concentric circles and the lines of like polarization are the radii: thus with polarizer and analyser regulated for extinction, the pattern consists of a series of bright and dark circles interrupted by a black cross with its arms parallel to the planes of polarization and analysation.

00In geometry, and in geometrical crystallography, the term denotes a line which serves to aid the orientation of a figure.

00arrangement of atoms within a protein is X-ray crystallography.

00Research areas include bioenergetics, molecular biology, fermentation, protein biochemistry, kinetic and paramagnetic spectroscopy and X-ray crystallography.

00biology through x-ray crystallography an electroscope is.

00Despite an enormous effort, only about 4,000 of the structures are known, with most determined by X-ray crystallography.

00A protein structure solved by X-ray crystallography is regarded as the gold standard to which all other structures are compared.

00Working in Oxford she used x-ray crystallography, a technique based on the diffraction of x-rays by crystals.

00Headings include crystallography, chemical composition, physical and optical properties, as well as an alphabetical listing of mineral species.

00Each year this covers one aspect of macromolecular crystallography.

00high Pressure crystallography The University of Edinburgh is at the forefront of extreme conditions science.

00John Warren will provide additional scientific support for small molecule crystallography.

00In 1997 we are in an era of synchrotrons and nanosecond time-resolved protein crystallography.

00crystallography laboratory.

00crystallography software suite.

00crystallography data which enables self-archiving of data by chemists.

00crystallography facility is to be established at the Diamond synchrotron in Oxford.

00crystallography studies.

00crystallography groups.

00Nobel prize for X-ray crystallography, shared with Dad, 1915.

00They want to biology through X-ray crystallography is true of.

00protein X-ray crystallography was introduced in the summer of 2003.

00Extension of the direct methods approach to structure solving by X-ray or electron crystallography based on the principle of maximum entropy.

00Astex Technology is a structure-based drug discovery company pioneering the use of high throughput X-ray crystallography.

00I also advise the small molecule crystallography service in the Chemistry Department.

00Cryo-electron microscopy: taking back the knight [Acrobat PDF] X-ray crystallography has been used to study viruses for over 20 years.

00molecule crystallography, physical chemistry and primitive computing.

00paramagnetic spectroscopy and X-ray crystallography.

00protein crystallography facilities to support projects in structural genomics.

00We are studying the structural biology of members of the serpin family of serine proteinase inhibitors using X-ray crystallography.

00serine proteinase inhibitors using X-ray crystallography.

00solved by X-ray crystallography is regarded as the gold standard to which all other structures are compared.

00solved by X-ray crystallography is regarded as the gold standard to which all other structures are compared.

00Details such as the absolute stereochemistry of tryptophan side chains, usually only available from high resolution X-ray crystallography, are also sometimes available.

00X-ray crystallography can thus be used to determine three-dimensional protein structures.

00synchrotron based crystallography.

00Research Keywords Chemical crystallography, structural systematics, supramolecular crystals, polymorphism, charge density studies, inorganic sulfides.

00throughput protein crystallography, where samples of unknown quality will arrive for screening and immediate data collection.

00X-ray crystallography is true of.

00Working in Oxford she used X-ray crystallography, a technique based on the diffraction of x-rays by crystals.

00Over 2000 enzymes are known and several hundred proteins have been crystallized and their detailed 3D structure determined by X-ray crystallography.

00X-ray crystallographye determination x-ray protein crystallography is still the best tool available today.

00The bisphenoids (the hemihedral forms of the tetragonal and rhombic bipyramids)., and the trigonal pyramid of the hexagonal system, are examples of non-regular tetrahedra (see Crystallography).

00His earlier papers were mostly concerned with crystallography, and the reputation they gained him led to his appointment as Privatdozent at Konigsberg, where in 1828 he became extraordinary, and in 1829 ordinary, professor of mineralogy and physics.

00The development of the theory of crystal structure, and the fundamental principles on which is based the classification of crystal forms, are treated in the article Crystallography; in the same place will be found an account of the doctrine of isomorphism, polymorphism and morphotropy.

00The actual values of the topic parameters can then readily be expressed in terms of the elements of the crystals (the axial ratios and angles), the density, and the molecular weight (see Groth, Physikalische Krystallographie, or Chemical Crystallography).

00In the article Crystallography the nature and behaviour of twinned crystals receives full treatment; here it is sufficient to say that when the planes and axes of twinning are planes and axes of symmetry, a twin would exhibit higher symmetry (but remain in the same crystal system) than the primary crystal; and, also, if a crystal approximates in its axial constants to 'a higher system, mimetic twinning would increase the approximation, and the crystal would be pseudo-symmetric.

00For a detailed comparison of the isomorphous relations of the elements the reader is referred to P. von Groth, Chemical Crystallography.

00The great French chemist, Dumas, gives him the credit for the first attempt to establish a system of crystallography.

00In crystallography the icosahedron is a possible form, but it has not been observed; it is closely simulated by a combination of the octahedron and pentagonal dodecahedron, which has twenty triangular faces, but only eight are equilateral, the remaining twelve being isosceles (see Crystallography).

00The mensuration of the cube, and its relations to other geometrical solids are treated in the article Polyhedron; in the same article are treated the Archimedean solids, the truncated and snubcube; reference should be made to the article Crystallography for its significance as a crystal form.

00Octahedra having triangular faces other than equilateral occur as crystal forms. See Polyhedron and Crystallography.

00Bevelment, as a term of crystallography, means the replacement of an edge of a crystal by two planes equally inclined to the adjacent planes.

00but they may, in accordance with the principles of crystallography, also occur in other forms symmetrically derived from the octahedron, - for example, the cube, the 2-faced figure known as the rhombic dodecahedron (fig.

00in crystallography as " twins."

00In crystallography, the regular or ordinary dodecahedron is an impossible form since the faces cut the axes in irrational ratios; the "pentagonal dodecahedron" of crystallographers has irregular pentagons for faces, while the geometrical solid, on the other hand, has regular ones.

00Many other dodecahedra exist as crystal forms, for which see Crystallography.

00Two such solids exist: (1) the " rhombic dodecahedron, " formed by truncating the edges of a cube, is bounded by 12 equal rhombs; it is a common crystal form (see Crystallography); and (2) the " semi-regular triacontahedron," which is enclosed by 30 equal rhombs.

00Hemihedral forms are of special importance in crystallography, to which article the reader is referred for a fuller explanation of these and other modifications of polyhedra (tetartohedral, enantiotropic, &c.).

00(Reference should be made to the article Crystallography for illustrations, and for applications of these phenomena to the determination of crystal form.) With an uniaxal plate perpendicular to the optic axis, the curves of constant retardation are concentric circles and the lines of like polarization are the radii: thus with polarizer and analyser regulated for extinction, the pattern consists of a series of bright and dark circles interrupted by a black cross with its arms parallel to the planes of polarization and analysation.

00In geometry, and in geometrical crystallography, the term denotes a line which serves to aid the orientation of a figure.

00Details such as the absolute stereochemistry of tryptophan side chains, usually only available from high resolution X-ray crystallography, are also sometimes available.

00X-ray crystallography can thus be used to determine three-dimensional protein structures.

00The NWSGC members have a high level of collective experience in synchrotron based crystallography.

00Research Keywords Chemical crystallography, structural systematics, supramolecular crystals, polymorphism, charge density studies, inorganic sulfides.

00These characteristics are required for high throughput protein crystallography, where samples of unknown quality will arrive for screening and immediate data collection.

00Keywords: Crystallography, X-ray, Powder diffraction, Crystal structure, Unit cell, Bragg reflections, Lattice parameters.

00Over 2000 enzymes are known and several hundred proteins have been crystallized and their detailed 3D structure determined by x-ray crystallography.

00In protein structure determination x-ray protein crystallography is still the best tool available today.

00The Crystallography Center at NUI, Galway is dedicated to the determination of molecular structure by x-ray diffraction techniques.

00

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