If you have a high off origin peak at 0 0 0.5 you must have absences
along the 00l axis also consistent with
P63 22.
So you need to test both P6322 and P6 22
And is the tetramer generated by crystal symmetry or is the whole thing
in the asymmetric unit?
Eleanor
Jorge Iulek wrote:
Dear all,
I got several suggestions.
I thought it is time to answer some questions, prepare a "partial"
"quasi"- summary and give some more feedback. Please, keep sending me any
more insights and suggestions you might have.
Briefly, the problem is:
"P622 (no systematic abscences), strong spots
al Message-
From: CCP4 bulletin board [mailto:[EMAIL PROTECTED] On Behalf Of
Jorge Iulek
Sent: 27 August 2007 12:48
To: CCP4BB@JISCMAIL.AC.UK
Subject: [ccp4bb] alternating strong/weak intensities in reciprocal
planes - P622
Dear all,
Please, maybe you could give some suggestions to the probl
Hi Jorge,
The strong h, k, l=2n and weak h, k, l=2n+1 pattern suggest pseudo body
centering. Does the off-origin Patterson peak lie at/near 0.5 0.5 0.5?
You could get pseudo body centering if an NCS 2-fold lies parallel to a
crystallographic 2(1) or 6(3) screw axis, with the NCS 2-fold a quar
On possibility for #5, the B factors all dropping to the lower limit
during refinement. If you are including all of your low resolution data
(which you should) but have not used a model for the bulk solvent scattering
of X-rays (which would be bad) then you will observe this result. The
refin
You said:
> 8) Processed in P6, P312 and P321, all of course suggest twinning.
These will all suggest partial twinning, but not necessarily perfect
twinning. I would start to consider twinning a possibility if the
statistics for these lower symmetry space groups suggest a partial twin fraction
of
Dear all,
Please, maybe you could give some suggestions to the problem below.
1) Images show smeared spots, but xds did a good job integrating them. The
cell is 229, 229, 72, trigonal, and we see alternating strong and weak rows
of spots in the images (spots near each other, but rows more sepa
