Foundations of Crystallography

 

Acta Cryst. (2003). A59, 287-296  [ doi:10.1107/S0108767303008109 ]

Determination of all misorientations of tetragonal lattices with low multiplicity; connection with Mallard's rule of twinning

H. Grimmer

Synopsis: Methods to determine the axial ratios of primitive and body-centred tetragonal lattices admitting multiplicities lower than a chosen upper limit are developed and applied to produce lists giving all cases with   5 and the corresponding twin mirror planes.

Online 26 June 2003

 

Acta Cryst. (2003). A59, 297-310  [ doi:10.1107/S0108767303008444 ]

Secondary extinction and diffraction behaviors in cylindrical crystals

H.-C. Hu

Synopsis: The power ratio distribution, the integrated power ratio and the secondary-extinction factor for cylindrical crystals with three kinds of mosaic distributions are calculated and are analyzed to reveal their relationship with the diffraction geometry.

Online 26 June 2003

 

Acta Cryst. (2003). A59, 311-316  [ doi:10.1107/S0108767303009036 ]

`Six-beam X-ray section topograph' images and computer-simulated images using the new n-beam dynamical theory based on the Takagi-Taupin equations

K. Okitsu, Y. Imai, Y. Ueji and Y. Yoda

Synopsis: A `six-beam X-ray section topograph' experiment was performed whose images are in excellent agreement with the images computer-simulated using a theory based on the Takagi-Taupin dynamical theory.

Online 26 June 2003

 

Acta Cryst. (2003). A59, 317-326  [ doi:10.1107/S0108767303008766 ]

Hexagonal and trigonal sphere packings. I. Invariant and univariant lattice complexes

H. Sowa, E. Koch and W. Fischer

Synopsis: All homogeneous sphere packings have been derived that refer to the invariant and univariant lattice complexes of the hexagonal crystal family. Numerous examples of corresponding crystal structures are given.

Online 26 June 2003

 

Acta Cryst. (2003). A59, 327-334  [ doi:10.1107/S0108767303009693 ]

S-SWAT (softer single-wavelength anomalous technique): potential in high-throughput protein crystallography

A. Olczak, M. Cianci, Q. Hao, P. J. Rizkallah, J. Raftery and J. R. Helliwell

Synopsis: Two phasing protocols are compared for Xe-apocrustacyanin A1 as a test case. The L1-absorption edge optimized Xe f'' signal using 2.0 Å wavelength yielded high-quality electron-density maps even with modest redundancy (7) from a single data set.

Online 26 June 2003

 

Acta Cryst. (2003). A59, 335-340  [ doi:10.1107/S0108767303010614 ]

Improving triplet-phase accuracy by symmetry observations in reference-beam diffraction measurements

Q. Shen

Synopsis: Symmetry in reference-beam diffraction experiments leads to a fourfold measurement redundancy of any triplet-phase in a complete 360° rotation, with two of the four cases corresponding to measurements of the coupling Friedel's mate that may give rise to enhanced three-beam interference effects.

Online 26 June 2003

 

Acta Cryst. (2003). A59, 341-350  [ doi:10.1107/S010876730301122X ]

Charge density and chemical bonding in rutile, TiO₂

B. Jiang, J. M. Zuo, N. Jiang, M. O'Keeffe and J. C. H. Spence

Synopsis: Accurate charge deformation maps in rutile are obtained by using accurate low-order X-ray structure factors measured by quantitative convergent-beam electron difraction.

Online 26 June 2003

 

Acta Cryst. (2003). A59, 351-360  [ doi:10.1107/S0108767303012017 ]

Identification of and symmetry computation for crystal nets

O. Delgado-Friedrichs and M. O'Keeffe

Synopsis: Methods of determining the combinatorial symmetry of a net and of determining whether two nets are combinatorially isomorphic are described.

Online 26 June 2003

 

Acta Cryst. (2003). A59, 361-366  [ doi:10.1107/S0108767303012030 ]

Inflation rule for Gummelt coverings with decorated decagons and its implication for quasi-unit-cell models

H.-C. Jeong

Synopsis: Quasi-unit-cell models and Penrose-tile models are equivalent.

Online 26 June 2003

 

Acta Cryst. (2003). A59, 367-370  [ doi:10.1107/S0108767303007608 ]

On the symmetry of simple 14- and 15-hedra

Y. L. Voytekhovsky and D. G. Stepenshchikov

Synopsis: The symmetry point-group statistics for all combinatorially non-isomorphic simple 14- (339722) and 15-hedra (2406841 in total) are contributed in the paper for the first time.

Online 26 June 2003

 

Acta Cryst. (2003). A59, 371-373  [ doi:10.1107/S0108767303009115 ]

Anomalous difference signal in protein crystals

Q. Shen, J. Wang and S. E. Ealick

Synopsis: A scattering-angle-dependent formula has been developed and used to estimate the anomalous signals in single-wavelength anomalous diffraction (SAD) experiments.

Online 26 June 2003

 

Acta Cryst. (2003). A59, 374-433  [ doi:10.1107/S0108767303010894 ]

International Union of Crystallography Nineteenth General Assembly and International Congress of Crystallography Geneva, Switzerland, 6-15 August 2002

Online 26 June 2003

 

Acta Cryst. (2003). A59, 434  [ doi:10.1107/S0108767303001697 ]

Quasicrystals. The state of the art

Online 26 June 2003

 

Acta Cryst. (2003). A59, 434-436  [ doi:10.1107/S0108767303010845 ]

Linus Pauling selected scientific papers

Online 26 June 2003

 

Acta Cryst. (2003). A59, 436  [ doi:10.1107/S0108767303010870 ]

On quaternions and octonions: their geometry, arithmetic and symmetry

Online 26 June 2003