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On Monday 31 October 2005 09:07 pm, James Holton wrote: > > To explain: one may recall the Crick-Magdoff equation (1959), which > estimates the magnitude of differences expected from the heavy atom > contribution: > > delta-I ~ sqrt(2Nh/Np)*(fh/fp) > > You can find this in Blundel and Johnson (1976) page 161 > The equation also seems to work if you > substitute f" for fh when you are trying to calculate the average > expected anomalous difference. You can try this out quickly using the online tool at http://www.bmsc.washington.edu/scatter/AS_signal.html -- Ethan A Merritt Biomolecular Structure Center University of Washington, Seattle 98195-7742
