Re: [ccp4bb] occupancy vs. Bfactors

2012-11-21 Thread Tim Gruene
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Dear James, your explanation is the background of the strong advice to always build as much as possible before running the next refinement cycle. I've seen directories with way more than one hundred runs of refmac and don't want to know what has been

Re: [ccp4bb] occupancy vs. Bfactors

2012-11-21 Thread Ian Tickle
John, can you give me a good reference on this? -- Ian On 21 November 2012 07:32, Jrh wrote: > Ian, yes absolutely but your very description of where the unit cells are > not identical is NOT the situation where we see fractional occupancy > moieties. In such cases a large fraction of the unit

Re: [ccp4bb] how many cycles to settle B-factor?

2012-11-21 Thread Eleanor Dodson
I wouldn't expect there is an exact ratio between occupancy and B factor? atomic density is ~ occ*formfactor * exp(-b s**2) Eleanor On 20 Nov 2012, at 09:49, Jim Brannigan wrote: > As an adjunct to B-factor vs occupancy thread, i might expect the b-factor to > halve if the occupancy is set t