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Sent: Friday, October 28, 2016 9:36 AM
To: CCP4BB@JISCMAIL.AC.UK<mailto:CCP4BB@jiscmail.ac.uk>
Subject: Re: [ccp4bb] Two SGs in one droplet?
I've seen this kind of thing before.
Case 1: two crystal forms in the same droplet, C2 and C222. If you looked
closely, you could tell them apart
Hi,
I see this case as an example of Order-Disorder structures. This theory was
developed by Dornburger-Schiff back in 1950s and very well documented.
According to this theory, it is structurally possible to have P1 and C2 (in
this case) and there should be a structural transformation between the
Dear all
Thanks a lot for the numerous input which is highly appreciated.
I should provide some updates as to what I have done on these two crystals
/ datasets.
I processed both datasets with HKL2000 as well as imosflm. Both softwares
give (essentially) the same unit cells as in the first
To: CCP4BB@JISCMAIL.AC.UK
Subject: Re: [ccp4bb] Two SGs in one droplet?
I've seen this kind of thing before.
Case 1: two crystal forms in the same droplet, C2 and C222. If you looked
closely, you could tell them apart and I was pretty good at getting a high
percentage of the desired space group
I've seen this kind of thing before.
Case 1: two crystal forms in the same droplet, C2 and C222. If you
looked closely, you could tell them apart and I was pretty good at
getting a high percentage of the desired space group by looking at the
crystal forms. The C2 form diffracted better, so I
Hi
Something I'd do is try different programs for the indexing to see if you get
both choices with any programs - Mosflm & XDS will give you the 44
characteristic lattices and cell parameters by default (so you can easily see
if anything like the C2 cell is a straightforward transformation of
From: CCP4 bulletin board <CCP4BB@JISCMAIL.AC.UK> on behalf of Sam Tang
<samtys0...@gmail.com>
Sent: 28 October 2016 14:13
To: CCP4BB@JISCMAIL.AC.UK
Subject: [ccp4bb] Two SGs in one droplet?
Dear all
Sorry for going a bit off-topic in this thread.
May
Hi Sam,
Yes. I've had 2 different crystal forms from the same drop. C2 vs C2221.
Completely different packing, despite that fact that 2 of the cell edges
were within an angstrom or two of each other.
In the above case, I soaked ligand into the crystals, one form had ligand
bound, one didn't,
Good morning,
53 x 2 = 106
79 x 2 = 158
Awfully close to 156 and 105 in the C-group. Are you sure there is no
tricky twinning or faulty indexing of some sort - in either of these space
group assignments?
On the other hand, I have seen two different habits and different
spacegroups growing from
Dear all
Sorry for going a bit off-topic in this thread.
May I seek your advice as on whether you have experienced that crystals
being obtained from the same droplet, looking alike under microscope (rod
shape) and in fact growing possibly from a same nuclei, give two space
groups after indexing?
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