[ccp4bb] AW: [ccp4bb] cryoprotection

2013-08-27 Thread Herman . Schreuder
A trick I like is just to freeze the reservoir solution or would-be cryo-solution without a crystal present. If the frozen solution stays clear and does not show ice rings on e.g. a home source, it is worth trying. Otherwise, the solution needs optimization. Herman -Ursprüngliche

Re: [ccp4bb] AW: [ccp4bb] cryoprotection

2013-08-27 Thread Enrico Stura
Herman, The trick you suggest is not as valid as you may think. The ice rings can originate from the crystal itself. If you crystallize in a high concentration PEG precipitant you will avoid ice rings, but if you transfer or soak your crystals in the same solution the high molecular weight

[ccp4bb] AW: [ccp4bb] AW: [ccp4bb] cryoprotection

2013-08-27 Thread Herman . Schreuder
@JISCMAIL.AC.UK] Im Auftrag von Enrico Stura Gesendet: Dienstag, 27. August 2013 11:58 An: CCP4BB@JISCMAIL.AC.UK Betreff: Re: [ccp4bb] AW: [ccp4bb] cryoprotection Herman, The trick you suggest is not as valid as you may think. The ice rings can originate from the crystal itself. If you crystallize