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ISSN: 2053-2733

March 2016 issue

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Cover illustration: Twisted X-rays can be used to study helical structures, as shown by Jüstel et al. [Acta Cryst. (2016), A72, 190-196]. Simulations show that the method could be applied to some of the most important structures in biology and a striking number of the structures that are emerging in nanoscience.

scientific commentaries


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Recent developments in the imaging of biological samples using the X-ray free-electron laser at the SACLA facility are highlighted.

advances

feature articles


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Cryogenic coherent X-ray diffraction imaging can be used for structural analysis of unstained, non-crystalline, whole biological samples such as cells and cell organelles. This article reports on current and future applications of cryo-coherent diffraction imaging with the X-ray free-electron laser (XFEL) at the Japanese XFEL facility, SACLA, and demonstrates the merit of a correlative approach with cryo-electron and light microscopy.

research papers


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An X-ray method of structure determination for some important noncrystalline structures is proposed.

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The possibility of using X-ray Compton scattering to reveal antisymmetric components of the electron momentum density, as a fingerprint of magnetoelectric sample properties, is investigated experimentally and theoretically by studying the polar ferromagnet GaFeO3.

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A new refinement approach based on lattice dynamics derived from periodic ab initio calculations is described. The approach is tested on high-resolution diffraction data for urea.

foundations

research papers


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An extension of phase retrieval algorithms for near-field X-ray (propagation) imaging to three dimensions is presented, enhancing the quality of the reconstruction by exploiting previously unused three-dimensional consistency constraints.

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All aristotypes of anion superstructures in the perovskite family of crystals are established. The calculated structures of some anion superstructures are reported.


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The Wiener index of various graphs represents a structure compactness measure of the graph. The face-centred cubic lattice is one of the most usual crystal lattices; in this paper, the Wiener index of its graph is computed having unit cells in a row.

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The crucial need for scaling of multicrystal data sets and for the correction of the light-induced response anisotropy inside a data set in time-resolved pump–probe crystallography is discussed. An application of methods developed is presented.

book reviews


international union of crystallography


Acta Cryst. (2016). A72, 263
doi: 10.1107/S2053273316002096
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