Acta Crystallographica Section A

Foundations of Crystallography

Volume 69, Part 2 (March 2013)



[Issue Author Index][Volume Author Index]
[Cover illustration] Cover illustration: A model of the second generation of a three-dimensional `paperfolding' structure on a background of a `crazy' tiling derived from two-dimensional paperfolding [Ben-Abraham et al. (2013). Acta Cryst. A69, 123-130].

research papers


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Acta Cryst. (2013). A69, 123-130  [ doi:10.1107/S010876731204531X ]

Multidimensional paperfolding systems

S. I. Ben-Abraham, A. Quandt and D. Shapira

Synopsis: A general multidimensional recursion rule for the regular paperfolding structure is put forward. The two-dimensional structure is explicitly constructed and its symbolic complexity computed. The structures yield multidimensional tilings as well.

Online 8 January 2013


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Acta Cryst. (2013). A69, 131-139  [ doi:10.1107/S0108767312046272 ]

Calculation of absorption and secondary scattering of X-rays by spherical amorphous materials in an asymmetric transmission geometry

J. C. Bendert, M. E. Blodgett and K. F. Kelton

Synopsis: Expressions for absorption and the secondary scattering intensity ratio are presented for a small beam impinging off-center of a spherical amorphous sample.

Online 8 January 2013


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Acta Cryst. (2013). A69, 140-150  [ doi:10.1107/S0108767312047150 ]

Structural constraints on the three-dimensional geometry of simple viruses: case studies of a new predictive tool

T. Keef, J. P. Wardman, N. A. Ranson, P. G. Stockley and R. Twarock

Synopsis: A new concept in virology provides insights into structural constraints on virus structure, extending Caspar-Klug theory to include predictions across all radial levels of the virus particle including genome organization. The predictive power of the new tool is demonstrated for a range of viruses, revealing a previously unrecognized structural interdependence of shapes and sizes of different viral components.

Online 8 January 2013


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Acta Cryst. (2013). A69, 151-163  [ doi:10.1107/S0108767312047162 ]

From an affine extended icosahedral group towards a toolkit for viral architecture

A. Janner

Synopsis: Affine extensions of the icosahedral group, applied to the investigation of icosahedral viruses, are considered in the framework of molecular crystallography.

Online 17 January 2013


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Acta Cryst. (2013). A69, 164-170  [ doi:10.1107/S0108767313000172 ]

A tunable multicolour `rainbow' filter for improved stress and dislocation density field mapping in polycrystals using X-ray Laue microdiffraction

O. Robach, J.-S. Micha, O. Ulrich, O. Geaymond, O. Sicardy, J. Härtwig and F. Rieutord

Synopsis: A technique to measure the energy profiles of Laue spots in X-ray Laue microdiffraction is presented. It uses a single-crystal diamond filter that attenuates several well defined energies in the incident white-beam spectrum. A first application to lattice-parameter measurements is demonstrated.

Online 7 February 2013


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Acta Cryst. (2013). A69, 171-188  [ doi:10.1107/S010876731204946X ]

Structure refinement from precession electron diffraction data

L. Palatinus, D. Jacob, P. Cuvillier, M. Klementová, W. Sinkler and L. D. Marks

Synopsis: It is demonstrated that crystal structures can be successfully refined against precession electron diffraction data using full dynamical calculations of diffracted intensities.

Online 1 February 2013


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Acta Cryst. (2013). A69, 189-196  [ doi:10.1107/S0108767312043905 ]

Propagation of neutron spherical waves through a thick, vibrating Ge single crystal

E. Raitman, V. Gavrilov, D. Mjasishchev, A. Hoser, O. Seidel and J. Stanh

Synopsis: The results of experimental and theoretical studies of the influence of ultrasound on neutron wave propagation in a thick Ge crystal are presented. At low amplitudes of ultrasonic waves interference effects (diffraction intensity beatings near the center of a Bormann fan) were observed for the first time.

Online 8 January 2013


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Acta Cryst. (2013). A69, 197-206  [ doi:10.1107/S0108767312046582 ]

[epsilon]-Machine spectral reconstruction theory: a direct method for inferring planar disorder and structure from X-ray diffraction studies

D. P. Varn, G. S. Canright and J. P. Crutchfield

Synopsis: A direct method for inferring and describing planar disorder in close-packed structures is presented.

Online 7 February 2013


addenda and errata


 

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Acta Cryst. (2013). A69, 207  [ doi:10.1107/S0108767313000238 ]

Fifty years of aperiodic crystals. Corrigendum

T. Janssen

Synopsis: Corrigendum to the article by Janssen [Acta Cryst. (2012). A68, 667-674].

Online 8 January 2013


book reviews


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Acta Cryst. (2013). A69, 208-209  [ doi:10.1107/S0108767313000639 ]

Understanding Single-Crystal X-ray Crystallography

Online 13 February 2013


international union of crystallography


 

[HTML version][PDF version][Supplementary Material]  [Open access]

Acta Cryst. (2013). A69, 210-239  [ doi:10.1107/S010876731202819X ]

Report of the Executive Committee for 2011

Online 13 February 2013


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