Well - it was Hamburg high resolution data - I guess we all had a stake in it.. Good meetings but You were part of them? Did you wear a Dutch hat? E
On Thu, 16 Jul 2020 at 12:07, Gerard DVD Kleywegt <ger...@xray.bmc.uu.se> wrote: > Hi Eleanor, > > Yes, I remember those meetings, when the UK was still an EU member and > Sweden > not yet (so Uppsala couldn't be formally involved) :-) > > Did Victor look into this too? I remember Gert doing it. And maybe Tom > Oldfield? > > Best wishes, > > --Gerard > > > > On Thu, 16 Jul 2020, Eleanor Dodson wrote: > > > Hmm - remember Gerard, the EU Validation initiative in the 1990s? We > > analysed these effects, or at least Victor Lamsin did, and we applauded > him. > > Cheers Eleanor > > > > On Thu, 16 Jul 2020 at 11:52, Clemens Vonrhein < > vonrh...@globalphasing.com> > > wrote: > > > >> Hi Robbie, > >> > >> On Wed, Jul 15, 2020 at 07:23:15PM +0000, Robbie Joosten wrote: > >>> At the same time if you have a a more relaxed approach to restraints > >>> than you might find systematic deviations in bond lengths. A test > >>> for that has been in WHAT_CHECK for decades and it actually works > >>> surprisingly well to detect cell dimension problems. > >> > >> Indeed. > >> > >>> That said, the problem is uncommon now. > >> > >> Not so sure about that: we all rely on an accurate value of the > >> energy/wavelength from the instrument/beamline - and if that is off > >> (for whatever reasons) it will result in incorrect cell dimensions and > >> a systematic deviation from the various restraints. > >> > >> This would even affect the best experiment done on the best crystal > >> ... so fairly easy to spot at the refinement stage, especially if such > >> an energy/wavelength offset is constant over a long period of time on > >> a given instrument. To spot this at the data collection stage one > >> would hope that at some point a crystal with very pronounced ice-rings > >> will be looked at properly (and the fact these are not where we expect > >> them to should cause some head-scratching). > >> > >> Cheers > >> > >> Clemens > >> > >> ######################################################################## > >> > >> To unsubscribe from the CCP4BB list, click the following link: > >> https://www.jiscmail.ac.uk/cgi-bin/WA-JISC.exe?SUBED1=CCP4BB&A=1 > >> > >> This message was issued to members of www.jiscmail.ac.uk/CCP4BB, a > >> mailing list hosted by www.jiscmail.ac.uk, terms & conditions are > >> available at https://www.jiscmail.ac.uk/policyandsecurity/ > >> > > > > ######################################################################## > > > > To unsubscribe from the CCP4BB list, click the following link: > > https://www.jiscmail.ac.uk/cgi-bin/WA-JISC.exe?SUBED1=CCP4BB&A=1 > > > > This message was issued to members of www.jiscmail.ac.uk/CCP4BB, a > mailing list hosted by www.jiscmail.ac.uk, terms & conditions are > available at https://www.jiscmail.ac.uk/policyandsecurity/ > > > > > Best wishes, > > --Gerard > > ****************************************************************** > Gerard J. Kleywegt > > http://xray.bmc.uu.se/gerard mailto:ger...@xray.bmc.uu.se > ****************************************************************** > The opinions in this message are fictional. Any similarity > to actual opinions, living or dead, is purely coincidental. > ****************************************************************** > Little known gastromathematical curiosity: let "z" be the > radius and "a" the thickness of a pizza. Then the volume > of that pizza is equal to pi*z*z*a ! > ****************************************************************** > ######################################################################## To unsubscribe from the CCP4BB list, click the following link: https://www.jiscmail.ac.uk/cgi-bin/WA-JISC.exe?SUBED1=CCP4BB&A=1 This message was issued to members of www.jiscmail.ac.uk/CCP4BB, a mailing list hosted by www.jiscmail.ac.uk, terms & conditions are available at https://www.jiscmail.ac.uk/policyandsecurity/
