Re: [ccp4bb] Two cells, one crystal

2010-08-04 Thread Herman . Schreuder
-Original Message- From: CCP4 bulletin board [mailto:ccp...@jiscmail.ac.uk] On Behalf Of Frank von Delft Sent: Wednesday, August 04, 2010 4:18 PM To: CCP4BB@JISCMAIL.AC.UK Subject: Re: [ccp4bb] Two cells, one crystal I'd expect anything from crystals, and this would not surprise me e

Re: [ccp4bb] Two cells, one crystal

2010-08-04 Thread Frank von Delft
I'd expect anything from crystals, and this would not surprise me either. Especially if it's a big crystal. That said: if the big cell has pseudo-translational symmetry, it will have lots of weak spots (?). So getting the "small cell" may just be an artefact of having very weak diffraction

[ccp4bb] Two cells, one crystal

2010-08-03 Thread SIPPEL,KATHERINE H
Hi all, I work on a protein that has two know space groups at the same condition. One is P21 with 1 molecule in the ASU (small cell) and the other is P21 with 2 molecules in the ASU (large cell with pseudo-translational symmetry and is a giant pain in the butt to deal with). I was shooting a