issue contents

ISSN: 2053-2733

January 2013 issue

Highlighted illustration

Cover illustration: William Lawrence Bragg at Cambridge (courtesy of the Royal Institution of Great Britain), shown with the indexed diffraction pattern for zinc blende [Proc. Cambridge Philos. Soc. (1913), 17, 43-57], the Cavendish Laboratory and a stamp from 1975 commemorating the 60th anniversary of the award of the Nobel Prize in 1915 to W. H. and W. L. Bragg (copyright Sweden Post Stamps).

Bragg centennial

Acta Cryst. (2013). A69, 1-4
doi: 10.1107/S0108767312048490
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A collection of articles contributed by speakers at the Bragg Centennial Symposium held in Adelaide on 6 December 2012 are introduced.

Acta Cryst. (2013). A69, 5-7
doi: 10.1107/S0108767312047514
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A tribute to W. L. Bragg by his younger daughter is presented.

Acta Cryst. (2013). A69, 8-9
doi: 10.1107/S0108767312046879
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An extract from the obituary for Sir Lawrence Bragg by M. F. Perutz [Nature (London), (1971), 233, 74–76] is given.

Acta Cryst. (2013). A69, 10-15
doi: 10.1107/S0108767312031133
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W. L. Bragg would have missed the Nobel Prize if his father had been awarded the prize together with von Laue in 1914. Fortunately, the Nobel Committee for Physics was aware of his contributions and decided to award the prize to W. H. Bragg together with his son in 1915, when they were both nominated.

Acta Cryst. (2013). A69, 16-24
doi: 10.1107/S0108767312034356
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A research student's view of life in W. L. Bragg's Cavendish Laboratory from 1950–1953 is given. The use of the bubble raft in illustrating the properties of dislocations in crystals is described.

Acta Cryst. (2013). A69, 25-33
doi: 10.1107/S0108767312046296
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The history of Bragg's law, life and work is reviewed with particular reference to the development of X-ray and electron microdiffraction. A summary of recent work applying the hard X-ray free-electron laser to problems in structural biology is given.

Acta Cryst. (2013). A69, 34-36
doi: 10.1107/S0108767312042924
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W. L. Bragg's critical role in encouraging, supporting and establishing the field of large-molecule crystallography is reviewed.

Acta Cryst. (2013). A69, 37-44
doi: 10.1107/S0108767312036021
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Early neutron diffraction experiments performed in 1944 using the first nuclear reactors are described.

Acta Cryst. (2013). A69, 45-50
doi: 10.1107/S0108767312047587
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The significance of Bragg's law in electron diffraction is discussed, with particular emphasis on the differences between X-ray and electron diffraction. Recent developments in X-ray instrumentation in electron microscopy which enable single atoms to be imaged and identified using X-ray analysis within an electron microscope are described.

Acta Cryst. (2013). A69, 51-59
doi: 10.1107/S0108767312050453
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The practices for determining the atomic structures in crystals have changed greatly over the century since Lawrence Bragg introduced the trial-and-error method by which he solved structures for rocksalt, iron pyrite and other salts and minerals. Structure determinations for biological macromolecules first borrowed from the small-molecule tradition that evolved, notably adopting isomorphous replacement; subsequently, however, new approaches have grown to dominate, notably anomalous diffraction and molecular replacement.

Acta Cryst. (2013). A69, 60-62
doi: 10.1107/S0108767312050441
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The neuraminidase inhibitors for treatment of influenza are an early example of drug discovery by crystallography.

research papers

Acta Cryst. (2013). A69, 63-74
doi: 10.1107/S010876731203629X
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A novel procedure for the characterization and the arithmetic classification of monoatomic multilattices in any dimension is proposed. The algorithm may be coded to provide an automatic classification procedure.

Acta Cryst. (2013). A69, 75-90
doi: 10.1107/S0108767312041657
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The standard settings of (3 + d)-dimensional superspace groups are determined for a series of modulated compounds, especially concentrating on d = 2 and 3. The coordinate transformation in superspace is discussed in view of its implications in physical space.

Acta Cryst. (2013). A69, 91-97
doi: 10.1107/S0108767312044601
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The focusing properties of a bent Laue polychromator crystal are investigated by a semi-analytical approach based on the dynamical diffraction theory.

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The C map has been combined with implication transformation and vector-superposition techniques to improve the Patterson deconvolution method.

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Structural imperfections play an important role in the formation of the diffraction patterns of membrane protein nanocrystals. Detailed analysis of the diffraction phenomenon shows that the scattering from such nanocrystals should be regarded in terms of a continuous diffractive field rather than a formulation based on discrete Bragg reflections.

short communications

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The multiplicity of the grid pattern formed by geodesic lines is included in the expression of the topological density of lattice nets.

international union of crystallography

Acta Cryst. (2013). A69, 122
doi: 10.1107/S0108767312046028
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