Re: [ccp4bb] Crystal with ZERO diffraction

2016-12-21 Thread James Phillips
I call these crystals as examples of Space Groups 231 where all reflections are systematically absent. Happy Solstice to everyone. The will be more daylight tomorrow (Northern Hemisphere). On Wed, Dec 21, 2016 at 1:44 PM, Tom Huxford wrote: > Dear ccp4b collective mind

Re: [ccp4bb] Crystal with ZERO diffraction

2016-12-21 Thread Gloria Borgstahl
I have learned to refrain from catapulting my crystals. Happy holidays, God bless us ... everyone (with diffracting crystals) On Wed, Dec 21, 2016 at 2:35 PM, Keller, Jacob wrote: > >In a second case we were working on a beamline on the west coast of the > US. Every

Re: [ccp4bb] Crystal with ZERO diffraction

2016-12-21 Thread Thomas, Leonard M.
December 21, 2016 2:53 PM To: CCP4BB@JISCMAIL.AC.UK Subject: Re: [ccp4bb] Crystal with ZERO diffraction Sadly, I have seen numerous examples of reasonably-sized crystals that give no observable ordered diffraction (I shot a few this weekend, in fact). I can’t give you evidence for what is happening,

Re: [ccp4bb] Crystal with ZERO diffraction

2016-12-21 Thread Patrick Loll
Sadly, I have seen numerous examples of reasonably-sized crystals that give no observable ordered diffraction (I shot a few this weekend, in fact). I can’t give you evidence for what is happening, but I guess that you can build a macroscopic assembly using lattice interactions that are only

Re: [ccp4bb] Crystal with ZERO diffraction

2016-12-21 Thread Keller, Jacob
>In a second case we were working on a beamline on the west coast of the US. >Every crystal we put on vanished before we could even collect data - the loops >appeared empty as soon as we looked through the microscope (this sets the >decade). The beamline had an extra strong magnet on the

Re: [ccp4bb] Crystal with ZERO diffraction

2016-12-21 Thread Edward Snell
PM To: CCP4BB@JISCMAIL.AC.UK Subject: [ccp4bb] Crystal with ZERO diffraction Dear ccp4b collective mind and experience, Greetings from San Diego. I have done my fair share of synchrotron data collection on many diverse macromolecular crystal systems. But this weekend was the first time that I

[ccp4bb] Crystal with ZERO diffraction

2016-12-21 Thread Tom Huxford
Dear ccp4b collective mind and experience, Greetings from San Diego. I have done my fair share of synchrotron data collection on many diverse macromolecular crystal systems. But this weekend was the first time that I ever shot crystals that failed to diffract entirely. Details: we have