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Response to de Graaff & de Gelder's comment on CRUNCH: a phase refinement program for high‐resolution macromolecular structures
Author(s) -
Langs David A.,
Blessing Robert H.,
Smith G. David
Publication year - 2000
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889800008335
Subject(s) - van de graaff generator , crunch , resolution (logic) , phase (matter) , chemistry , crystallography , materials science , computer science , physics , optics , programming language , biology , beam (structure) , organic chemistry , physiology
The February issue of the Journal of Applied Crystallography, in the section Computer Programs, contains the paper entitled CRUNCH: a phase re®nement program for high-resolution macromolecular structures, by Langs, Blessing & Smith (2000). We would like to point out that an earlier program system Crunch has been available to the scienti®c 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 dif®cult `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.