Acta Crystallographica Section A

Foundations of Crystallography

Volume 65, Part 5 (September 2009)

Cover illustration: Electron-density isosurface of silicon coloured with electrostatic potential (red for lowest and blue for highest), together with a convergent-beam electron-diffraction (CBED) pattern of silicon. The red regions between neighbouring atoms indicate that the electrostatic potential is lowered due to the excess (bonding) electrons. The electrostatic potential and electron density were determined using a CBED structure-refinement method [Ogata et al. (2008), Acta Cryst. A64, 587-597]. The figure was drawn using VESTA [Momma & Izumi (2008), J. Appl. Cryst. 41, 653-658].

research papers
international union of crystallography

research papers

Acta Cryst. (2009). A65, 329-341 [ doi:10.1107/S0108767309024660 ]

Differential geometry: a natural tool for describing symmetry operations

P. Kocian, K. Schenk and G. Chapuis

Synopsis: Using differential geometry, a unified description of the symmetry of crystals is presented. This formalism does not require additional dimensions in the modulated case, for which the modulation wave is expressed by a particular parameterization of three-dimensional space.

Online 30 July 2009

Acta Cryst. (2009). A65, 342-351 [ doi:10.1107/S0108767309025008 ]

Point substitution processes for decagonal quasiperiodic tilings

N. Fujita

Synopsis: A general construction principle for the inflation rules for decagonal quasiperiodic tilings is proposed.

Online 30 July 2009

Acta Cryst. (2009). A65, 352-359 [ doi:10.1107/S0108767309026257 ]

Phase modulation effects in X-ray diffraction from a highly deformed crystal with variable strain gradient

M. Shevchenko

Synopsis: The concept of interbranch phase modulation of an X-ray wavefield is extended to the case of a large gradient, which depends on the depth inside the crystal. Diffraction (extinction) contrast is also discussed for a strongly deformed specimen containing a single dislocation.

Online 30 July 2009

Acta Cryst. (2009). A65, 360-363 [ doi:10.1107/S0108767309026270 ]

Edge-transitive lattice nets

O. Delgado-Friedrichs and M. O'Keeffe

Synopsis: Properties of periodic edge-transitive nets with one vertex in the primitive unit cell are described.

Online 30 July 2009

Acta Cryst. (2009). A65, 364-370 [ doi:10.1107/S010876730902786X ]

Using dynamically scattered electrons for three-dimensional potential reconstruction

C. T. Koch

Synopsis: The use of dynamically scattered electrons for three-dimensional potential reconstruction is described.

Online 31 July 2009

Acta Cryst. (2009). A65, 371-389 [ doi:10.1107/S0108767309024088 ]

Louis Pasteur's discovery of molecular chirality and spontaneous resolution in 1848, together with a complete review of his crystallographic and chemical work

H. D. Flack

Synopsis: Louis Pasteur's crystallographic and chemical work is described.

Online 12 August 2009

international union of crystallography

Acta Cryst. (2009). A65, 390-442 [ doi:10.1107/S0108767308033643 ]

International Union of Crystallography Twenty-First General Assembly and International Congress of Crystallography, Osaka, Japan, 23-31 August 2008

Online 14 August 2009