Re: [ccp4bb] PHENIX BSS refinement

2009-02-04 Thread Pavel Afonine
Hi Miguel, Right, but why this happens only in the final bss step ? Why not in the first one? It's arbitrary: one can do it every macro-cycle as well. The main idea is to have a total B-factor in ATOM records written out to a PDB file. I have noticed the behaviour described by José when I

Re: [ccp4bb] PHENIX BSS refinement

2009-02-04 Thread Miguel Ortiz Lombardia
Hi Pavel, Thanks, it is clear now. I have a last concern, though. Does phenix impose minimal values to the refined ADPs? I guess it does not, for I have found nothing like that in the documentation. But, if it does so, are they imposed to the individual B-factors or the B-overall is also

Re: [ccp4bb] PHENIX BSS refinement

2009-02-04 Thread Pavel Afonine
Hi Miguel, there are limits and they are applied to total B-factor: - minimal Biso should be positive; - anisotropic ADP matrix is always enforced to be positive definite. Pavel. Thanks, it is clear now. I have a last concern, though. Does phenix impose minimal values to the refined ADPs? I

[ccp4bb] PHENIX BSS refinement

2009-02-03 Thread Jose Casasnovas
We have seen that the recent versions of phenix (1.3) the structure refinement ends with a bulk solvent correction step, something I found quite unusual (absent in other refinement programs and in older versions of phenix, 1.24.1). We have also seen that the B factor jumps up in this last step

Re: [ccp4bb] PHENIX BSS refinement

2009-02-03 Thread Pavel Afonine
Hi Jose, We have seen that the recent versions of phenix (1.3) the structure refinement ends with a bulk solvent correction step, something I found quite unusual (absent in other refinement programs and in older versions of phenix, 1.24.1). - the software is evolving and gets better over