Restructuring of the IUCr editorial office
Abstract
<h2>Journal of Applied Crystallography</h2><h3></h3><h3>0021-8898</h3> <h2>international union of crystallography</h2> Volume 27 Part 1 Page 131 February 1994 <h2>Restructuring of the IUCr editorial office</h2> J. Appl. Cryst. (1994). 27, 131 PSL + SEARCHER and DIREC- TER - automatic structure analysis of organic compounds using a PC. By KENJI OKADA, Research and Development Center, Ricoh Co. Ltd, Kouhoku-ku, Yoko- hama 223, Japan (Received 19 May 1993; accepted 3 August 1993) The crystallographic problem: PSL selects one heavy-atom solving Patter- son function and SEARCHER de- termines the positions of all the remaining atoms automatically. DIREC- TER is based on the symbolic-addition method and automatically determines most atoms. In a single PC run, the user can determine the molecular fragments by inputting the atom symbols with no chemical assumptions or human inter- vention. Method of solution: PSL and SEARCHER are used for organic compounds that include sulfur or a heavier atom. The PSL procedure is as follows: (i) read the cell constants, heavy-atom symbol, reflection data and Harker sets; (ii) calculate the Patterson function for all Harker sets or an asymmetric unit and store the peaks and heights (u, v, w, H); (iii) convert all peaks into coordinates, combine these coordinates and store