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 | JOURNAL OF APPLIED CRYSTALLOGRAPHY |
Comment on CRUNCH: a phase refinement program for high-resolution macromolecular structures by Langs, Blessing & Smith (2000)
aGorlaeus Laboratories, Leiden Institute of Chemistry, University of Leiden, PO Box 9502, NL-2300 RA Leiden, The Netherlands, and bCrystallography Laboratory, Department of Inorganic Chemistry, Nijmegen SON Research Center, University of Nijmegen, Toernooiveld 1, NL-6525 ED Nijmegen, The Netherlands
*Correspondence e-mail: rag@chema110.leidenuniv.nl
The February issue of the Journal of Applied Crystallography, in the section Computer Programs, contains the paper entitled CRUNCH: a phase refinement program for high-resolution macromolecular structures, by Langs, Blessing & Smith (2000![[Langs, D. A., Blessing, R. H. & Smith, G. D. (2000). J. Appl. Cryst. 33, 174-175.]](../../../../../../logos/arrows/j_arr.gif "Langs, D. A., Blessing, R. H. & Smith, G. D. (2000). J. Appl. Cryst. 33, 174-175.")
).
We would like to point out that an earlier program system Crunch has been available to the scientific community for a number of years now (Abrahams & de Graaff, 1998; de Graaff, 1998; Cram et al., 1999; de Gelder & de Graaff, 1999). Crunch has been developed for the automatic solution of difficult `small' structures.
Without discussing the various merits and demerits of the two programs, we feel that the existence of two different programs aimed at the same or a similar group of users and bearing the same name will lead to unnecessary confusion.
We hope that Dr Langs et al. will address this point as soon as possible.
References
Abrahams, J. P. & de Graaff, R. A. G. (1998). Curr. Op. Struct. Biol. 8, 601–605. Web of Science CrossRef CAS
Cram, D. J., de Graaff, R. A. G., Knobler, C. B., Lingenfelter, D. S., Maverick, E. F. & Trueblood, K. N. (1999). Acta Cryst. B55, 432–440. Web of Science CSD CrossRef CAS IUCr Journals
Gelder, R. de & de Graaff, R. A. G. (1999). IUCr XVIII Congress and General Assembly, Collected Abstracts, edited by C. C. Wilson, K. Shankland & T. Csoka, p. 92.
Graaff, R. A. G. de (1998). Workshop Lecture Notes 18: Riding the Fence Between Large and Small Molecules, ACA Annual Meeting, Washington, DC, USA, pp. 1–12.
Langs, D. A., Blessing, R. H. & Smith, G. D. (2000). J. Appl. Cryst. 33, 174–175. Web of Science CrossRef CAS IUCr Journals
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