Cover illustration: A crystal of the protein phosphorylase b flash-cooled to 100 K in a 1 mm-diameter mohair loop prior to collection of X-ray diffraction data. Courtesy of
Elspeth Garman and Stephen Lee, University of Oxford. |

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*J. Appl. Cryst.* (1997). **30**, 1-6 [doi:10.1107/S0021889897099111]

*J. Appl. Cryst.* (1997). **30**, 7-15 [doi:10.1107/S0021889896009466]

**Synopsis:** The theory and design principles of the monolithic double-crystal spectrometer are presented.

*J. Appl. Cryst.* (1997). **30**, 16-20 [doi:10.1107/S0021889896000696]

**Synopsis:** The technique of high-energy monochromatic Laue X-ray scattering using image plates to record the diffraction patterns is presented.

*J. Appl. Cryst.* (1997). **30**, 21-30 [doi:10.1107/S0021889896009995]

**Synopsis:** Synchrotron X-ray powder diffraction using the imaging-plate technique makes it possible to obtain structural information using short exposure times. As examples are given the
refinement of the structure of -quartz and the structure determination of a new zirconium hydrogen phosphate, Zr(HPO_{4})_{2}. Equations for data reduction for flat imaging-plate geometry are presented.

*J. Appl. Cryst.* (1997). **30**, 31-42 [doi:10.1107/S0021889896006851]

**Synopsis:** By an iterative combination of the crystallographic Rietveld method and discrete methods of texture analysis, quantitative information about texture can be obtained from
diffraction spectra. The new method relies on spectra from a few sample orientations and many diffraction peaks.

*J. Appl. Cryst.* (1997). **30**, 43-48 [doi:10.1107/S0021889896008758]

**Synopsis:** The orientation distribution of two low-crystal-symmetry phases, YBCO 123 and 211, in a magnetically aligned high-critical-temperature superconducting sample, has been determined
with the WIMV algorithm from highly incomplete pole figures, measured by neutron diffraction.

*J. Appl. Cryst.* (1997). **30**, 49-54 [doi:10.1107/S002188989600876X]

**Synopsis:** An evacuated temperature-controlled cell has been built for small-angle X-ray scattering measurements with synchrotron radiation. The use of this cell results in a reduction of
the background by a factor of between 2 and 15 as a function of the scattering angle.

*J. Appl. Cryst.* (1997). **30**, 55-58 [doi:10.1107/S0021889896008916]

**Synopsis:** Structural parameters of a kaolinite-type clay mineral are determined by the use of *R* factors. The model used contains ±**b**/3 translational defects.

*J. Appl. Cryst.* (1997). **30**, 59-64 [doi:10.1107/S0021889896008990]

**Synopsis:** A simple method for the determination of deuterium incorporation into nonexchangeable (C-bonded) positions of RNA and protein components of the *Escherichia
coli* ribosome at biosynthetic deuteration using small-angle neutron scattering is proposed.

*J. Appl. Cryst.* (1997). **30**, 65-70 [doi:10.1107/S0021889896009983]

**Synopsis:** The extent of the reflection range in the oscillation method has been analyzed according to the
mosaicity-cap model using a nest of Ewald spheres. The formulas are used in the software for processing area-detector data.

*J. Appl. Cryst.* (1997). **30**, 71-72 [doi:10.1107/S0021889896008047]

**Synopsis:** A practical step-by-step description of the construction of loops for protein cryocrystallography using pulled-out microinjection capillaries is presented.

*J. Appl. Cryst.* (1997). **30**, 73-78 [doi:10.1107/S0021889896006711]

**Synopsis:** The program *SPGR4D* is written in Fortran77 for deriving four-dimensional symmetry operations from the corresponding space-group symbols. See the
*Journal of Applied Crystallography* Software List 1997.

*J. Appl. Cryst.* (1997). **30**, 79-83 [doi:10.1107/S0021889896008643]

**Synopsis:** A software library is described that provides simple and convenient access to information in Crystallographic Information File (CIF) dictionaries and data files. See the
*Journal of Applied Crystallography* Software List 1997.

*J. Appl. Cryst.* (1997). **30**, 84 [doi:10.1107/S0021889896011673]

**Synopsis:** A program for the refinement of unit-cell parameters is described. It incorporates deletion diagnostics, enabling the identification of erroneous measurements and outliers in the
data set. See the *Journal of Applied Crystallography* Software List 1997.

*J. Appl. Cryst.* (1997). **30**, 84-85 [doi:10.1107/S0021889896012435]

**Synopsis:** An interactive freeware DOS program for plotting and viewing Rietveld refinement data is presented. See the *Journal of Applied Crystallography*
Software List 1997.

*J. Appl. Cryst.* (1997). **30**, 85 [doi:10.1107/S0021889896012447]

**Synopsis:** An interactive PC-DOS program for displaying crystal structures is presented. See the *Journal of Applied Crystallography* Software List 1997.

*J. Appl. Cryst.* (1997). **30**, 85-86 [doi:10.1107/S0021889896012459]

**Synopsis:** An interactive PC-DOS program for simulating Kossel and Kikuchi patterns for crystals and quasicrystals is presented. See the *Journal of Applied
Crystallography* Software List 1997.

*J. Appl. Cryst.* (1997). **30**, 86 [doi:10.1107/S002188989709910X]

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