Re: [phenixbb] Implementation of French & Wilson data correction?

Joe, if you are into testing these different approaches, you may also consider this (which is also described by Bernhard on p.344 of his book) Sivia&David, 1994, Acta Cryst A50:703. It's a simple calculation that is easy to implement, and I have the code that does the conversion, let me know if you'll need it. Also beware that phenix used to ignore input Fo's as long as the intensities are still present (this may have changed though). So if you want it to use the Fo's that you have supplied, make sure that intensities are deleted from the input mtz-file. Ed. On Fri, 2011-02-25 at 11:13 -0800, Joseph Noel wrote:

Jeff,

Thanks! So it sounds like if we use Mosfilm to process raw image files then Scala/Truncate prior to input into Phenix as a MTZ file we wouldn't want to employ this option in Phenix.

Joe

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Joseph P. Noel, Ph.D. Investigator, Howard Hughes Medical Institute Professor, The Jack H. Skirball Center for Chemical Biology and Proteomics The Salk Institute for Biological Studies 10010 North Torrey Pines Road La Jolla, CA 92037 USA

Phone: (858) 453-4100 extension 1442 Cell: (858) 349-4700 Fax: (858) 597-0855 E-mail: [email protected]

On Feb 25, 2011, at 10:58 AM, Jeff Headd wrote:

...

Hi Joe,

On Fri, Feb 25, 2011 at 10:38 AM, Joseph Noel wrote:

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I'll give it a go! I know Otwinowski well and we have had many discussions about negative intensities. Do you know if Scala/Truncate resets negative intensities to 0?

Both truncate and ctruncate include an implementation of the F&W method, so negative intensities will be scaled to have a positive value.

Thanks, Jeff

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