Re: [ccp4bb] High Rmerge with thin frames

2010-11-05 Thread Peter Cherepanov
Hi Sergei, such fine slicing during data collection would suggest a large cell. How many reflections are you merging? And what is the redundancy (in the expected symmetry)? Rmerge tends to go up with more reflections added. Peter On 5 Nov 2010, at 08:40, Sergei Strelkov wrote: > Dear All, >

[ccp4bb] EDS warning

2010-02-16 Thread Peter Cherepanov
it looks like despite PDB now releasing coordinates with TOTAL B factors, the Electron Density Server continues to add the TLS component on top of what already is total B prior to map calculation. (Just in case if someone else out there is wondering why solvent and ligands [not included in TLS

Re: [ccp4bb] Rfactor got stuck with a data having alternate strong and weak reflections.

2009-09-02 Thread Peter Cherepanov
1) do you have unexplained peaks in your native Patterson? (calculate from your model and compare, if in doubt) 2) do you have both streaky and sharp reflections present on a subset of your images ? if answers to both questions are yes, then you might have a case of LTD/OD twinning. The la

Re: [ccp4bb] Fwd: Twinning

2009-01-18 Thread Peter Cherepanov
Dear Andreas and all, refining multiple models together would sound like the most straightforward solution in a case like that. But (please correct me if I am wrong), generally, such trick can only work in P1: obviously, any symmetry operation (but lattice translation) applied to the sh