[phenixbb] Another question about twinned maps

Pavel Afonine pafonine at lbl.gov
Tue Mar 22 07:20:00 PDT 2011


  Hi Mary,

no, this is not done if the data is from twinned crystal. Maps already 
can be model biased due to detwinning (if twin-fraction is close to 0.5) 
so I didn't want it to be even worse

Pavel.

On 3/22/11 5:51 AM, Mary Ho wrote:
> Pavel-
>
> Another related question...  Does the option for Fill Missing F(Obs) 
> with F(Calc) work for twinned maps?  If I turn it on, I don't get an 
> error but the maps don't seem any different.
>
> Just wondering,
>
> Thanks,
>
> Mary
>
> On Mon, Mar 21, 2011 at 11:44 AM, Pavel Afonine <pafonine at lbl.gov 
> <mailto:pafonine at lbl.gov>> wrote:
>
>      Hi Mary,
>
>     I'm not sure map sharpening is done in case of twinning (otherwise
>     it is an option that you can turn on/off either in phenix.refine
>     or in more specific tool for maps calculation called phenix.maps).
>     I will check this later today and reply.
>
>     Pavel.
>
>
>
>     On 3/21/11 8:08 AM, Mary Ho wrote:
>
>         I'm using phenix-1.7-650.  When phenix.refine generates the
>         detwinned maps with apply B-factor sharpening on and no value
>         inputed, is the value the program uses for sharpening output
>         anywhere?
>
>         Thanks,
>
>         Mary X. Ho
>         Postdoctoral Associate
>         Arnold Lab
>         Rutgers
>
>
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