Re: [ccp4bb] Phasing at Low Resolution

2009-05-14 Thread Guangyu Zhu
Zn and Se have similar f' and f''. Why Zn seems have much better phasing powder in practice? Is it just because Zn always binds tightly on protein but Se might have higher b-factor? Guangyu On 5/14/09 2:31 PM, "Pete Meyer" wrote: > You might find Structure 14, 973-982 Jun 2006 of interest. >

Re: [ccp4bb] Phasing at Low Resolution

2009-05-14 Thread Guangyu Zhu
tate. This could affect phasing, but could be avoided in most cases. Guangyu On 5/14/09 4:48 PM, "Tommi Kajander" wrote: > ...Based on what? i doubt thats true. > > Quoting "Guangyu Zhu" : > >> Zn and Se have similar f' and f''. Why Zn seems

Re: [ccp4bb] SHELX-2013 release and homepage

2013-02-26 Thread Guangyu Zhu
ss/?p=71 ) Is it possible to build one for Mac 10.5.8? Thanks! Guangyu Zhu On 2/26/13 3:32 AM, "George Sheldrick" wrote: >As some of you have already discovered, there is a major new release of >the whole >of SHELX (the first since 1997) complete with a new homepage that shou

[ccp4bb] Resolution and data/parameter ratio, which one is more important?

2013-03-14 Thread Guangyu Zhu
I have this question. For exmaple, a protein could be crystallized in two crystal forms. Two crystal form have same space group, and 1 molecule/asymm. One crystal form diffracts to 3A with 50% solvent; and the other diffracts to 3.6A with 80% solvent. The cell volume of 3.6A crystal must be 5/2=

Re: [ccp4bb] Resolution and data/parameter ratio, which one is more important?

2013-03-15 Thread Guangyu Zhu
ill most likely be significantly higher in the 3.6A 80% case; after all that's probably the reason that it only diffracts to 3.6A! All things considered I would go for the 3A form. Cheers -- Ian On 15 March 2013 00:27, Guangyu Zhu mailto:g...@hwi.buffalo.edu>> wrote: I have this que