No, I only wore Dutch clogs :-) Uppsala was an observer I think so Alwyn and I
could attend the meetings, but we couldn't hire anyone.
--G
On Thu, 16 Jul 2020, Eleanor Dodson wrote:
> 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 <[log in to unmask]>
> 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 <
>> [log in to unmask]>
>>> 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
>>>>
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>>
>>
>> Best wishes,
>>
>> --Gerard
>>
>> ******************************************************************
>> Gerard J. Kleywegt
>>
>> http://xray.bmc.uu.se/gerard mailto:[log in to unmask]
>> ******************************************************************
>> 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 !
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Best wishes,
--Gerard
******************************************************************
Gerard J. Kleywegt
http://xray.bmc.uu.se/gerard mailto:[log in to unmask]
******************************************************************
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/
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