Derivation of Magnetostriction and Anisotropic Energies for Hexagonal, Tetragonal, and Orthorhombic Crystals

1954 ◽  
Vol 96 (2) ◽  
pp. 302-310 ◽  
Author(s):  
W. P. Mason
Keyword(s):  
Orthorhombic Crystals

An improved criterion method for indexing unknown powder diffraction patterns

1991 ◽  
Vol 194 (3-4) ◽  
Author(s):  
Tadashi Ishida
Keyword(s):  
Powder Diffraction ◽  
Orthorhombic Crystals ◽  
Diffraction Patterns ◽  
New Criterion ◽  
Crystallographic Axes ◽  
Criterion Method

AbstractA method has been proposed for indexing powder diffraction patterns using a new criterion. An improved version of our previous procedure (Ishida and Watanabe, 1982) is proposed especially for determining the monoclinic unique axis, crystallographic axes of orthorhombic crystals and

Die Kristall- und Molekülstruktur des Tris(ethylendiamin)cadmium(II)-dibenzohydroxamathydrates, CdC20H38O5N8

1984 ◽  
Vol 166 (3-4) ◽  
Author(s):  
Mariot Breitwieser ◽  
Siegfried Göttlicher ◽  
Helmut Paulus
Keyword(s):  
Space Group ◽  
Orthorhombic Crystals

AbstractOrthorhombic crystals of nearly 1 cm lengths have been obtained from a solution of cadmiumbenzohydroxamate in ethylenediamine. The space group is

Studies of mineral sulpho-salts: II. Jamesonite from Cornwall and Bolivia (With Plates XXVI and XXVII.)

1940 ◽  
Vol 25 (170) ◽  
pp. 597-608 ◽  
Author(s):  
L. G. Berry
Keyword(s):  
Analogous Composition ◽  
Orthorhombic Crystals

Jamesonite is described in Dana (1892, p. 122) as a soft, brittle, steel-grey to lead-grey mineral forming acicular orthorhombic crystals, a: b = ‘0·915:1’ (in error for 0·8195:1), with perfect basal cleavage; composition, 2PbS.Sb2S3; principal occurrence, Cornwall. Jamesonite is taken as the type member of a group that includes cosalite, described in the first of these studies (1939), dufrenoysite, and other minerals of analogous composition.

Sulpharsenites of lead from the Binnenthal. Part IV.—Seligmannite : with a supplementary note on Baumhauerite

1903 ◽  
Vol 13 (62) ◽  
pp. 336-341 ◽  
Author(s):  
R. H. Solly
Keyword(s):  
Chemical Analysis ◽  
New Mineral ◽  
Chemical Formula ◽  
Supplementary Note ◽  
Small Crystals ◽  
Orthorhombic Crystals

Professor Baumhauer, in January, 1901, described five very small crystals of a new mineral, to which he gave the name seligmannite. They were associated with rathite and binnite in dolomite, and came from the Lengenbach quarries in the Binnenthal, Switzerland. In June, 1902, he described another crystal, the angles of which agreed fairly well with those of the crystals he had previously measured. In habit and twinning, these orthorhombic crystals so closely resembled bournonite that he ventured to assign to the new mineral the chemical formula Cu2S.2PbS.As2S3, but from paucity of material he was unable to make a chemical analysis.

The crystal structure of myoglobin III. Sperm-whale myoglobin

1957 ◽  
Vol 238 (1214) ◽  
pp. 305-324 ◽  
Keyword(s):  
Sperm Whale ◽  
Two Dimensional ◽  
Crystal Forms ◽  
Space Group ◽  
Spin Resonance ◽  
Orthorhombic Crystals ◽  
Optical Dichroism ◽  
Sperm Whale Myoglobin ◽  
Identical Crystal ◽  
Good Agreement

Myoglobin of Physeter catodon (sperm whale) forms monoclinic crystals with space group P 2 1 (type A ) in ammonium sulphate, and orthorhombic crystals with space group P 2 1 2 1 2 1 (type B ) in phosphate. Almost identical crystal forms are obtained from related species of whale. Two-dimensional Patterson projections have been computed from some principal zones of reflexions in each type of crystal. They are used to derive the chain directions of the poly­peptide chains in the molecules relative to the crystal axes, and to suggest plausible methods of packing in the two forms. The data are best fitted by a molecule having dimensions about 25 x 34 x 42 Å, the latter dimension being parallel to the chain direction. Measurements of electron-spin resonance (Bennett & Ingram 1956) and of optical dichroism have been used to determine the orientation of the planes of the haem group and the angle between them and the chains. It is concluded that the angle is 40 to 50° in the two forms, in good agreement with the value found for type F crystals in an earlier paper, namely, 41°. Thus in all three crystal types A , B and F the data are consistent with the molecule having the same set of dimensions, associated with a common chain direction and a common relation between chain direction and haem group.

Overexpression, purification, crystallization and preliminary structural study of dTDP-6-deoxy-L-lyxo-4-hexulose reductase (RmlD), the fourth enzyme of the dTDP-L-rhamnose synthesis pathway, from Salmonella enterica serovar Typhimurium

1999 ◽  
Vol 55 (12) ◽  
pp. 2043-2046 ◽  
Author(s):  
Marie-France Giraud ◽  
Helen J. McMiken ◽  
Gordon A. Leonard ◽  
Paul Messner ◽  
Chris Whitfield ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Cell Wall ◽  
Recombinant Protein ◽  
Salmonella Enterica ◽  
Pathogenic Bacteria ◽  
Salmonella Enterica Serovar Typhimurium ◽  
Diffusion Method ◽  
Vapour Diffusion ◽  
Serovar Typhimurium ◽  
Orthorhombic Crystals

L-Rhamnose is an essential component of the cell wall of many pathogenic bacteria. Its precursor, dTDP-L-rhamnose, is synthesized from α-D-glucose-1-phosphate and dTTP via a pathway requiring four distinct enzymes: RmlA, RmlB, RmlC and RmlD. RmlD catalyses the terminal step of this pathway by converting dTDP-6-deoxy-L-lyxo-4-hexulose to dTDP-L-rhamnose. RmlD from Salmonella enterica serovar Typhimurium has been overexpressed in Escherichia coli. The recombinant protein was purified by a two-step protocol involving anion-exchange and hydrophobic chromatography. Dynamic light-scattering experiments indicated that the recombinant protein is monodisperse. Crystals of native and selenomethionine-enriched RmlD have been obtained using the sitting-drop vapour-diffusion method with polyethylene glycol as precipitant. Diffraction data have been collected from orthorhombic crystals of both native and selenomethionyl-derivatized protein, allowing tracing of the protein structure.

scholarly journals Azide inhibition of urate oxidase

2014 ◽  
Vol 70 (7) ◽  
pp. 896-902 ◽  
Author(s):  
Laure Gabison ◽  
Nathalie Colloc'h ◽  
Thierry Prangé
Keyword(s):  
Uric Acid ◽  
Binding Site ◽  
Substrate Binding ◽  
Competitive Inhibitor ◽  
Urate Oxidase ◽  
X Ray Diffraction ◽  
Experimental Conditions ◽  
Substrate Binding Site ◽  
Cyanide Inhibition ◽  
Orthorhombic Crystals

The inhibition of urate oxidase (UOX) by azide was investigated by X-ray diffraction techniques and compared with cyanide inhibition. Two well characterized sites for reagents are present in the enzyme: the dioxygen site and the substrate-binding site. To examine the selectivity of these sites towards azide inhibition, several crystallization conditions were developed. UOX was co-crystallized with azide (N3) in the presence or absence of either uric acid (UA, the natural substrate) or 8-azaxanthine (8AZA, a competitive inhibitor). In a second set of experiments, previously grown orthorhombic crystals of the UOX–UA or UOX–8AZA complexes were soaked in sodium azide solutions. In a third set of experiments, orthorhombic crystals of UOX with the exchangeable ligand 8-nitroxanthine (8NXN) were soaked in a solution containing uric acid and azide simultaneously (competitive soaking). In all assays, the soaking periods were either short (a few hours) or long (one or two months). These different experimental conditions showed that one or other of the sites, or the two sites together, could be inhibited. This also demonstrated that azide not only competes with dioxygen as cyanide does but also competes with the substrate for its enzymatic site. A model in agreement with experimental data would be an azide in equilibrium between two sites, kinetically in favour of the dioxygen site and thermodynamically in favour of the substrate-binding site.

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