[phenixbb] anomalous difference map

CPMAS Chen cpmasmit at gmail.com
Wed Sep 10 06:10:00 PDT 2014

Thanks, Nat.

If this is noise, why the anomalous or LLG peaks could be as high as 5 ~ 6


On Tue, Sep 9, 2014 at 5:58 PM, Nathaniel Echols <nechols at lbl.gov> wrote:

> On Tue, Sep 9, 2014 at 8:40 AM, CPMAS Chen <cpmasmit at gmail.com> wrote:
>> Is it possible that I have anomalous and LLG peak, but I have no
>> difference density peak? In this case, is that because the model I have is
>> not good enough or the diffraction data at this site of the model is
>> missing?
> You should at a minimum see > 1sigma density in the 2mFo-DFc map, and if
> the site is unmodeled (or modeled as a water) you should see an mFo-DFc
> peak as well.  If neither of these applies, the anomalous and LLG peaks are
> probably just noise.
> -Nat



Charles Chen

Research Associate

University of Pittsburgh School of Medicine

Department of Anesthesiology

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