[IUCr 2014 Congress]

[German Crystallographic Society (DGK) 2014]

Acta Crystallographica Section A

Foundations and Advances

Volume 70, Part 2 (March 2014)



[Issue Author Index][Volume Author Index]
[Cover illustration] Cover illustration: Viruses and fullerenes obey similar mathematical constraints. Point arrays derived from affine symmetries provide blueprints both for the organization of material in a virus (here Pariacoto virus, middle) and for the atomic positions in nested fullerene cages called carbon onions (here the carbon onion C60-C240-C540, C60 not shown), showing that affine symmetry is a common thread in biology and chemistry [Dechant et al. (2014). Acta Cryst. A70, 162-167].

mathematical crystallography

foundations


mathematical crystallography


research papers


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Acta Cryst. (2014). A70, 95-105  [ doi:10.1107/S2053273313033573 ]

Prospects for mathematical crystallography

G. McColm

Synopsis: Considered as an emerging field, how mathematical crystallography grows during the 21st century may depend on how it addresses demand and attracts recruits within the chemical, physical and mathematical communities.

Online 12 February 2014


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Acta Cryst. (2014). A70, 106-125  [ doi:10.1107/S2053273313029082 ]

Effects of merohedric twinning on the diffraction pattern

M. Nespolo, G. Ferraris and B. Souvignier

Synopsis: The effect of merohedric twinning on the reflection conditions and the symmetry of the diffraction pattern is analysed systematically and criteria to confirm or exclude the presence of twinning are presented.

Online 12 February 2014


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Acta Cryst. (2014). A70, 126-137  [ doi:10.1107/S205327331303091X ]

Brillouin-zone database on the Bilbao Crystallographic Server

M. I. Aroyo, D. Orobengoa, G. de la Flor, E. S. Tasci, J. M. Perez-Mato and H. Wondratschek

Synopsis: The Brillouin-zone database of the Bilbao Crystallographic Server (http://www.cryst.ehu.es) is presented. Recent improvements and modifications of the database are discussed and illustrated by several examples.

Online 12 February 2014


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Acta Cryst. (2014). A70, 138-142  [ doi:10.1107/S2053273313033585 ]

On physical property tensors invariant under line groups

D. B. Litvin

Synopsis: Materials invariant under infinite subsets of line groups are shown to have physical property tensors of the same form.

Online 18 February 2014


foundations


research papers


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Acta Cryst. (2014). A70, 143-153  [ doi:10.1107/S2053273313032038 ]

Direct phasing in femtosecond nanocrystallography. I. Diffraction characteristics

J. P. J. Chen, J. C. H. Spence and R. P. Millane

Synopsis: The diffraction of X-ray free-electron laser pulses by protein nanocrystals and the implications for direct phasing are investigated.

Online 15 January 2014


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Acta Cryst. (2014). A70, 154-161  [ doi:10.1107/S2053273313032725 ]

Direct phasing in femtosecond nanocrystallography. II. Phase retrieval

J. P. J. Chen, J. C. H. Spence and R. P. Millane

Synopsis: A selective sampling scheme is described to improve the noise tolerance of direct phasing based on shape transform diffraction between Bragg reflections in nanocrystallography using X-ray free-electron lasers.

Online 15 January 2014


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Acta Cryst. (2014). A70, 162-167  [ doi:10.1107/S2053273313034220 ]

Viruses and fullerenes - symmetry as a common thread?

P.-P. Dechant, J. Wardman, T. Keef and R. Twarock

Synopsis: Carbon onions from affine extensions are considered in analogy with virus work.

Online 18 February 2014


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Acta Cryst. (2014). A70, 168-180  [ doi:10.1107/S2053273313034219 ]

Alternative approaches to onion-like icosahedral fullerenes

A. Janner

Synopsis: The carbon atomic positions obtained by a quantum-chemical computation are compared with model ones having six integral indices. In one approach these indices follow from affine extensions of the icosahedral group and in another one from crystallographic scaling transformations.

Online 20 February 2014


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Acta Cryst. (2014). A70, 181-185  [ doi:10.1107/S2053273313034384 ]

What periodicities can be found in diffraction patterns of quasicrystals?

J. Wolny, B. Kozakowski, P. Kuczera, L. Pytlik and R. Strzalka

Synopsis: The structure of quasicrystals is aperiodic; however, their diffraction patterns comprise periodic series of peaks, which can be used to retrieve essential features of the quasicrystalline structure.

Online 20 February 2014


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Acta Cryst. (2014). A70, 186-198  [ doi:10.1107/S2053273313033822 ]

Symmetry of helicoidal biopolymers in the frameworks of algebraic geometry: [alpha]-helix and DNA structures

M. Samoylovich and A. Talis

Synopsis: The chain of algebraic geometry and topology constructions permits one to single out a special class of discrete helicoidal structures. The symmetry of these structures determines the structural parameters of the [alpha]-helix and topology of the A, B and Z forms of DNA.

Online 26 February 2014


book reviews


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Acta Cryst. (2014). A70, 199-202  [ doi:10.1107/S2053273313032919 ]

Essentials of Crystallography

Online 20 February 2014


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