issue contents

ISSN: 2053-2733

July 2007 issue

Highlighted illustration

Cover illustration: The molecular form of the guanosine-5'-phosphate tetramer [Zimmerman (1976). J. Mol. Biol. 106, 663-672] has vertices at points of a cubic lattice with parameter a defined by the distance of O6 from the centre. The height is H = 2a and the basis a square scaled by a factor 6 from the central hole. Another square, scaled by 3[square root]2 and turned by 45°, separates phosphates and bases. The indices of the molecular forms are indicated. Courtesy of A. Janner.

research papers

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Monte Carlo simulations and analytical results are used to demonstrate that the hexagonal close-packed pair correlations for different values of random growth and deformation faults can be collapsed into master curves when plotted against a variable scaled with respect to a characteristic length scale.

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The Gumbel–Fisher–Tippett (GFT) extreme-value analysis is applied to study the distribution, expectation value and standard deviation of the highest normalized structure-factor amplitude.

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A novel one-dimensional phase-retrieval approach applied to X-ray diffraction data from microfluidic arrays enabled the determination of the concentration profiles of confined colloidal solutions in a model-independent way with a resolution in the 10 nm range.

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Quantities describing the character of the grain-boundary network in a two-dimensional crystallographically consistent polycrystal are derived for arbitrary crystal symmetry and orientation distribution function of the grains.

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A method is proposed to search for topological relations between periodic nets and to find all subnets for a given net. The peculiarities of the approach are illustrated by a large number of examples of the nets often occurring in crystal structures.

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Face-transitive tilings with Delaney–Dress symbol size less than 33 are generated. The nets of their dual tilings are edge-transitive.

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A simple tensorial contraction method has been developed to obtain analytical formulae for X-ray resonant magnetic scattering. The method has been extended to non-spherical systems by deriving new phenomenological formulae.

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All homogeneous sphere packings were derived that refer to the bivariant lattice complexes with orthorhombic symmetry. Examples of corresponding crystal structures are given.

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Using group-theoretical methods, a unique and exhaustive enumeration is presented of the isotropy subgroups (and their corresponding order-parameter directions) belonging to irreducible representations of the (3+1)-dimensional superspace extensions of the 230 crystallographic space groups at all incommensurate k points.

book reviews

Acta Cryst. (2007). A63, 374
doi: 10.1107/S0108767307027250

books received

Acta Cryst. (2007). A63, 374
doi: 10.1107/S0108767307021344
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