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May 2008 issue
Cover illustration: An octagonal mosaic from the Kasbah de Telouet, High Atlas, Morocco, based on a modified quasilattice. The underlying quasilattice can best be seen in the blue-and-black portions of the pattern where the `standing' lozenges define bars of unit width and the diagonally positioned lozenges define bars with a width equal to ![[square root]](/logos/entities/radic_rmgif.gif)
2. Four orientations of the bar scheme, 45° apart, and phason shifts (alternation of bars in the sequence) are present. Picture taken by Emil Makovicky during the 24th European Crystallographic Meeting 2007.
research papers
The effect of deuteration is examined by data mining of the Cambridge Structural Database (CSD) for 26 isomorphous and three non-isomorphous pairs. Significant and meaningful changes are found in four and two, respectively, but the changes are less than neutron protein crystallography would be sensitive to.
Using first-principles calculations, it is shown that a monoclinic structure with space group B1a1 is the lowest-energy structure among all the experimentally known structures.
Static and dynamic characteristics of layerwise growth in two-dimensional quasiperiodic Ito–Ohtsuki tilings are studied.
An approach is outlined for X-ray structure refinement using atomic density fragments obtained by Hirshfeld partitioning of quantum-mechanical density fragments. Results are presented for urea and benzene.
Dynamical calculations are given for the X-ray back diffraction (1240) in a monolithic two-plate silicon cavity at photon energy 14.4388 keV, at which 24 beams are simultaneously excited.
New concepts and the principles of residual-density analysis are introduced.
Crystallographic properties of one-, two- and three-dimensional magnetic space groups are presented in a format and content similar to that of International Tables for Crystallography.
The nets of the three-periodic regular polyhedra are identified.
short communications
A monotypic, but not isohedral, simple tiling is described.
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