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  • 1
    Electronic Resource
    Electronic Resource
    Crystallization of the N-terminal domain of human sex hormone-binding globulin, the major sex steroid carrier in blood (1999)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 55 (1999), S. 2053-2055 
    Details
    ISSN: 1399-0047
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The amino-teminal laminin G-like domain of human sex hormone-binding globulin (SHBG), which contains the steroid-binding site and the dimerization domain, has been produced in Escherichia coli, purified to homogeneity and crystallized in complex with 5α-dihydrotestosterone (DHT) in two different crystal forms. Native data sets have been collected for tetragonal crystals (space group P4122 or P4322; unit-cell parameters a = 52.2, c = 148.4 Å) diffracting to 3.3 Å and trigonal crystals (R32; a = 104.0, c = 84.4 Å) diffracting to better than 1.6 Å. Since both crystal forms can only accommodate a single monomer in the asymmetric unit and share twofold rotational symmetry, it is proposed that the homodimer of this truncated form of SHBG, as observed in ultracentrifugation experiments, displays C2 point-group symmetry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0907444999012883
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  • 2
    Electronic Resource
    Electronic Resource
    The influence of crystal and sample symmetries on the orientation distribution function of the crystallites in polycrystalline materials (1981)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 37 (1981), S. 889-899 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: In the most general case the orientation distribution of crystals in a polycrystalline sample is to be described by a function of orthogonal transformations which splits up into two functions of rotations corresponding to right- and left-handed crystals. The properties of these functions are influenced by crystal and sample symmetry. The rotational subgroup of crystal symmetry leads to symmetry relations which may be written in the form of selection rules. Elements of the second kind of the crystal symmetry give rise to a determinability condition, according to which the texture function may be split into a part \tilde{f}(g) which can be determined from polycrystal diffraction experiments and a part \tilde{\tilde{f}}(g) which cannot. The determinability condition may take on three different forms according to whether the crystal symmetry contains a centre of inversion, a mirror plane or a \bar 4 inversion axis. In the case of normal scattering the Laue symmetry is to be considered instead of the true crystal symmetry. The sample symmetry is to be described by a black-white or Shubnikov group containing four kinds of elements which give rise to four kinds of symmetry conditions in the function f(g). The sample symmetry may be a conventional one consisting of one-to-one relationships between crystal orientations. It may, however, also be a non-conventional one defined by an integral relation between an infinite number of crystal orientations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739481001915
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  • 3
    Electronic Resource
    Electronic Resource
    Crystallization and preliminary X-ray diffraction studies of the peptide methionine sulfoxide reductase from Escherichia coli (2000)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 56 (2000), S. 1194-1197 
    Details
    ISSN: 1399-0047
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Peptide methionine sulfoxide reductase mediates the reduction of protein sulfoxide methionyl residues back to methionines and could thus be implicated in the antioxidant defence of organisms. Hexagonal crystals of the Escherichia coli enzyme (MsrA) were obtained by the hanging-drop vapour-diffusion technique. They belong to space group P6522, with unit-cell parameters a = b = 102.5, c = 292.3 Å, γ = 120°. A native data set was collected at 1.9 Å resolution. Crystals of selenomethionine-substituted MsrA were also grown under the same crystallization conditions. A three-wavelength MAD experiment has led to the elucidation of the positions of the Se atoms and should result in a full structure determination.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0907444900009483
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  • 4
    Electronic Resource
    Electronic Resource
    Comparing crystallographic and solution structures of nitrogenase complexes (1999)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 55 (1999), S. 727-728 
    Details
    ISSN: 1399-0047
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0907444999003856
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  • 5
    Electronic Resource
    Electronic Resource
    Disorder and twin refinement of RNA heptamer double helices (1999)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 55 (1999), S. 1405-1413 
    Details
    ISSN: 1399-0047
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: An RNA helix with seven base pairs which was derived from the acceptor stem of Escherichia coli tRNAAla, rGGGGCUA·rUAGCUCC (ALAwt), as well as a variant, rGGGGCUA·rUAGCCCC (ALAC70), in which the single G·U wobble base pair of ALAwt was replaced by G·C, crystallize in space group C2. Both non-isomorphic crystal forms display a complex packing pattern, which can be described alternatively as disorder or pseudo-merohedral twinning. The structure of ALAwt was determined by SIRAS phasing using an isomorphous iodine derivative, rGGGGCi5UA·rUAGCUCC (ALAI). All three RNA structures were subsequently subjected to twin refinement in space group P1, using anisotropic thermal displacement parameters at resolutions of 1.16, 1.23 and 1.4 Å for ALAwt, ALAI and ALAC70, respectively. Alternatively, the structure of ALAwt was refined in space group C2 assuming twofold disorder of the molecular orientation. The refined structures are of reasonable quality according to all available indicators. There are no systematic differences between the molecular models resulting from twin refinement and disorder refinement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0907444999007441
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  • 6
    Electronic Resource
    Electronic Resource
    Structure of the stable phase of methylhydrazine – first observations of phase transitions (1994)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 50 (1994), S. 472-479 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108768194001655
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  • 7
    Electronic Resource
    Electronic Resource
    Evalution of volume fractions of fiber-type texture components (1994)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 27 (1994), S. 358-361 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: A method of evaluating the volume fractions of fiber-type texture components in tube-like regions around selected fiber axes is described. The application of the method is illustrated on a rapidly solidified and annealed Fe–6.5mass%Si alloy ribbon.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889893010714
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  • 8
    Electronic Resource
    Electronic Resource
    Determination of a Mean Orientation from a Cloud of Orientations. Application to Electron Back-Scattering Pattern Measurements (1996)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 29 (1996), S. 662-666 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The purpose of this work was to determine the orientations of grains in polycrystals using electron back-scattering patterns (EBSP). In order to lower the degree of statistical uncertainty, the orientation of the same grain was measured several times. The orientation of the corresponding grain was assumed to be the mean of the orientations measured. From a theoretical point of view, the way to calculate a mean orientation from several orientations was solved on the basis of the properties of quaternions. The accuracy of the measurements, including the mean and maximum deviation of the orientations established, could be evaluated. The orientation of α plates of Ti-64 products was determined and it was possible to show that the metallurgical state of the parent β phase prior to the β–α phase transformation is likely to influence the orientation spread of the variants inherited from the same β grain, belonging to the same orientation family.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889896006693
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  • 9
    Electronic Resource
    Electronic Resource
    High-temperature furnace for INEL CPS 120 (1997)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 30 (1997), S. 557-558 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: A heat-treatment device has been developed in order to analyse the dynamics of structural transformation of powdered materials. This furnace is able to reach 1123 K, with a low-temperature gradient along the quartz capillary and is designed to work on a curved INEL CPS 120 detector with a classical X-ray generator (molybdenum tube). The device permits the collection of a set of recordings at different temperatures during a short period of time for moderately diffractive materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889897004718
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  • 10
    Electronic Resource
    Electronic Resource
    The role of the inversion centre in texture analysis (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 544-554 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Polycrystalline samples of non-centrosymmetrical enantiomorphic materials may be considered as two-phase materials consisting of a right-handed and a left-handed phase, each of which has its own texture. Centrosymmetrical crystals may be considered as right- or left-handed at the same time. If the right- and left-handed nature of the crystals is fully to be taken into account then the statistical sample symmetry is correctly to be described by black–white point groups rather than by the ordinary ones. If the sample symmetry does not belong to one of the `grey' groups then the series expansion of the texture functions contains terms of odd order which are blotted out in polycrystal diffraction experiments by virtue of the inversion centre in the crystal symmetry or by Friedel's law. In certain cases it seems possible, however, to obtain an approximation to the odd part by making use of the non-negativity condition in the zero ranges of the texture function. Many important physical properties are centrosymmetric (even if the crystals themselves are not). In these cases the odd part of the texture function does not enter into the expression relating the polycrystal property to the corresponding one of the single crystals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889880012757
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