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  • 1
    Electronic Resource
    Electronic Resource
    Crystallization and 2.2 Å resolution structure of R-phycoerythrin from Gracilaria chilensis: a case of perfect hemihedral twinning (2001)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. 52-60 
    Details
    ISSN: 1399-0047
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: R-phycoerythrin, a light-harvesting component from the red algae Gracilaria chilensis, was crystallized by vapour diffusion using ammonium sulfate as precipitant agent. Red crystals grew after one week at 293 K and diffracted to 2.70 Å resolution. Three serial macroseeding assays were necessary to grow a second larger crystal to dimensions of 0.68 × 0.16 × 0.16 mm. This crystal diffracted to 2.24 Å resolution using synchrotron radiation at beamline BM14 of the European Synchrotron Radiation Facility (ESRF) at Grenoble, France and was used for structure determination. Data were collected at 100 K to a completeness of 98.6%. The crystal was trigonal, space group R3, with unit-cell parameters a = b = 187.3, c = 59.1 Å, α = β = 90, γ = 120°. Data treatment using the CCP4 suite of programs indicated that the crystal was twinned (〈I2〉/〈I〉2 = 1.41). Molecular replacement was performed with AMoRe using the R-phycoerythrin from Polysiphonia urceolata [Chang et al. (1996), J. Mol. Biol. 249, 424–440] as a search model. In order to overcome the twinning problem, SHELX97 was used for the crystallographic refinement. The twin fraction was 0.48, indicating a nearly perfect hemihedrally twinned crystal. The final Rwork and Rfree factors are 0.16 and 0.25, respectively. All the residues and chromophores of the α- and β-chains are well defined in the electron-density maps. Some residues belonging to the γ-linker are also recognizable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0907444900015274
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  • 2
    Electronic Resource
    Electronic Resource
    Planar faults in layered Bi-containing perovskites studied by X-ray diffraction line profile analysis (2001)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 34 (2001), S. 699-703 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Profile fitting procedures associated with integral breadth studies and Fourier analysis are applied to the study of the complex Bi-containing layered perovskite SrBi2Nb2O9. Strong line broadening anisotropy is evidenced. Both `size' and `strain' effects contribute to the observed width. However, `size' broadening along the [00l] direction is essentially caused by stacking faults. The coherently diffracting domain sizes are deduced from Fourier analysis of the diffraction patterns and a rough estimate of the mean distance between faults is given. Thermal annealing significantly decreases the stacking fault density.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889801011700
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  • 3
    Electronic Resource
    Electronic Resource
    Structural analysis of pyrrolidinones (2000)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 56 (2000), S. 193-196 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: In the course of a study on pyrrolidinones, the crystal structures of four compounds, namely, methyl N-[(4-methoxyphenyl)(3,4,5-trimethoxyphenyl)methyl]pyroglutamate, C23H27NO7, methyl N-[naphthyl-(3,4,5-trimethoxyphenyl)methyl]pyroglutamate diacetyl peroxide, C26H27NO6·-0.5C4H6O4, 5-(3,4,5-trimethoxyphenyl)-1,2,3,11b-tetrahydro-5H-naphtho[1,8-f,g]indolizin-3-one, C24H23NO4, and 5-(3,4,5-trimethoxyphenyl)-1,2,3,5,12,12a-hexahydronaphtho[1,2-f]indolizine-3,12-dione, C25H23NO5, are presented, compared and discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270199013037
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