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Hi Natalie Try - P. Román, C. Guzmán-Miralles and A. Luque, Acta Cryst. (1993). B49, 383-386 [ doi:10.1107/S0108768192007201 ] "Estimate of a relationship between the number of atoms and the volumes of the unit cells of organic compounds" & references therein On 5 May 2014, at 12:07, Natalie Tatum wrote: > Hi all, > > I've had an interesting question from an undergradute student, > asking if there's any specific reference for the "18Ĺ rule of thumb" > in small molecule crystallography for dividing the volume of a unit > cell by 18 for the approximate number of non-hydrogen atoms. > > I'm afraid my google-fu has failed me, but I was curious as to > whether there is a reference associated with the practice of if it's > just one of those handy little pieces of advice for crystal screening. > > Thanks, > > Natalie > > Natalie J. Tatum > http://about.me/tatum.nj > PhD Researcher > Pohl Group > Durham University > Harry -- ** note change of address ** Dr Harry Powell, MRC Laboratory of Molecular Biology, Francis Crick Avenue, Cambridge Biomedical Campus, Cambridge, CB2 0QH