Dear All,
I posted some odd diffraction late last year consisting of Bragg
diffraction spots with a diffuse ring or halo. Along with Richard
Welberry at ANU we have now published an explanation for this diffuse
scattering. For those that are interested the reference is:-
Acta Cryst. (2011).
Dear All,
Thank you for the replies sorry about the delay in my reply. Here is
some more information, for those of you that are interested, to try fill
in some gaps.
The data was collected on our home source with osmic vairmax-HF optics
and an RAXISIV++ detector. We are investigating
Dear David,
Many thanks indeed for this movie and the extra info.
It is quite captivating!
The 'strange spot' features do seem progress to other regions of
reciprocal space at approximately constant diffraction resolution in
an anti-clockwise manner.but I am still digesting your movie
: Wednesday, November 03, 2010 10:53 AM
Subject: Re: [ccp4bb] Strange spots
Dear All,
Thank you for the replies sorry about the delay in my reply. Here is some
more information, for those of you that are interested, to try fill in
some gaps.
The data was collected on our home source with osmic
November 2010 17:00
To: CCP4BB@JISCMAIL.AC.UK
Subject: Re: [ccp4bb] Strange spots
Dear David,
Many thanks indeed for this movie and the extra info.
It is quite captivating!
The 'strange spot' features do seem progress to other regions
of reciprocal space at approximately constant diffraction
: Wednesday, November 03, 2010 12:52 PM
Subject: Re: [ccp4bb] Strange spots
OK! John prompted me to look more carefully at the images and they
don't seem to be consistent with any optics or detector effect.
Attached a Blowup (almost as strange as Antonioni's 1966 film with this
name) of one of the areas
Dear Jurgen and Petr,
I looked at the Princeton incommensurate link kindly provided by Petr.
I see your point ie examples of a grouping of subsidiary spots around
a central spot. But not continuous circles.
I have now checked the Atlas of Optical Transforms (my office copy en
route to Manchester
[mailto:ccp...@jiscmail.ac.uk] On
Behalf Of John R Helliwell
Sent: 31 October 2010 12:47
To: CCP4BB@JISCMAIL.AC.UK
Subject: Re: [ccp4bb] Strange spots
Dear Jurgen and Petr,
I looked at the Princeton incommensurate link kindly provided by Petr.
I see your point ie examples of a grouping
.
Liz
From: CCP4 bulletin board on behalf of Sanishvili, Ruslan
Sent: Fri 29/10/2010 21:08
To: CCP4BB@JISCMAIL.AC.UK
Subject: Re: [ccp4bb] Strange spots
C'mon now! Everybody knows that frogs in real space become handsome princes
Fig from John (I have a copy of his book in the office and will see it only
tomorrow) due to better quality
makes it clear (at least for me) that we see the similar effect shown by David
Goldstone.
Dr Felix Frolow
Professor of Structural Biology and Biotechnology
Department of Molecular
Dear Dave,
You have a collector's item there!
The closest I have seen is illustrated in my book 'Macromolecular
Crystallography with Synchrotron Radiation' page 321, which is a small
molecule example.
Best wishes,
John
Prof John R Helliwell DSc
On Fri, Oct 29, 2010 at 5:08 PM, David Goldstone
Dear John,
Would it be possible to know more about what you are referring to
without having to buy (or steal) your book :-)) ?
Thank you in advance!
With best wishes,
Gerard.
--
On Fri, Oct 29, 2010 at 06:41:51PM +0100, John R Helliwell wrote:
Dear
Dear Gerard
I will do a scan of fig 8.1b asap, probably Monday.
Greetings,
John
Sent from my iPad
On 29 Oct 2010, at 18:44, Gerard Bricogne g...@globalphasing.com wrote:
Dear John,
Would it be possible to know more about what you are referring to
without having to buy (or steal) your
Google books:
http://books.google.com/books?id=RqNb241Q484Cprintsec=frontcoverdq=Macromolecular+Crystallography+with+Synchrotron+Radiationhl=enei=JA3LTMe2NMSnnQfAjN3mDwsa=Xoi=book_resultct=resultresnum=1ved=0CC8Q6AEwAA#v=onepageqf=false
-Original Message-
From: CCP4 bulletin board [mailto:ccp...@jiscmail.ac.uk] On Behalf Of
Julian Nomme
Sent: Friday, October 29, 2010 2:10 PM
To: CCP4BB@JISCMAIL.AC.UK
Subject: Re: [ccp4bb] Strange spots
Google books:
http://books.google.com/books?id=RqNb241Q484Cprintsec=frontcoverdq=Mac
romolecular
Sent: 29 October 2010 17:08
To: CCP4BB@JISCMAIL.AC.UK
Subject: [ccp4bb] Strange spots
Dear All,
Does anyone have any insight into what the circles around the spots might be?
cheers
Dave
--
David Goldstone, PhD
National Institute for Medical Research
Molecular Structure
The Ridgeway
Yes, but the question is what in real space gives rise to reciprocal-space frog
spawn? (Frogs, I guess?)
- Original Message -
From: Marcus Winter
To: CCP4BB@JISCMAIL.AC.UK
Sent: Friday, October 29, 2010 2:56 PM
Subject: Re: [ccp4bb] Strange spots
Dear
From: CCP4 bulletin board [mailto:ccp...@jiscmail.ac.uk] On Behalf Of
Jacob Keller
Sent: Friday, October 29, 2010 3:00 PM
To: CCP4BB@JISCMAIL.AC.UK
Subject: Re: [ccp4bb] Strange spots
Yes, but the question is what in real space gives rise to
reciprocal-space frog spawn? (Frogs, I
Only when you do refinement(explains other thread about the unexplained
R-gap)
JPK
- Original Message -
From: Sanishvili, Ruslan
To: Jacob Keller ; CCP4BB@JISCMAIL.AC.UK
Sent: Friday, October 29, 2010 3:08 PM
Subject: RE: [ccp4bb] Strange spots
C'mon now! Everybody
I think this is a poly-crystalline incommensurately modulated crystal, i.e.
incommensurately modulated crystal, which fractured upon freezing, resulting
in averaging of satellite spots.
Fig. 3b from here:
http://www.princeton.edu/~actin/documents/Proteincrystalscanbeincommensurate
lymodulated.pdf
From: CCP4 bulletin board on behalf of Sanishvili, Ruslan
Sent: Fri 29/10/2010 21:08
To: CCP4BB@JISCMAIL.AC.UK
Subject: Re: [ccp4bb] Strange spots
C'mon now! Everybody knows that frogs in real space become handsome princes in
the reciprocal one...
N.
Ruslan
On Friday, October 29, 2010 12:59:40 pm Jacob Keller wrote:
Yes, but the question is what in real space gives rise to reciprocal-space
frog spawn? (Frogs, I guess?)
You may laugh, but the Google finds hits on the topic here:
Autoindexing in the truest sense of the word? ;-)
On 10/29/10 12:08 PM, David Goldstone david.goldst...@nimr.mrc.ac.uk wrote:
Dear All,
Does anyone have any insight into what the circles around the spots
might be?
cheers
Dave
--
David Goldstone, PhD
National Institute for Medical Research
On Fri, Oct 29, 2010 at 4:25 PM, Ethan Merritt merr...@u.washington.edu wrote:
You may laugh, but the Google finds hits on the topic here:
http://atlas-conferences.com/cgi-bin/abstract/cauu-47
anyone who made complete sense of that abstract is invited to go here :
book link.
Liz
From: CCP4 bulletin board on behalf of Sanishvili, Ruslan
Sent: Fri 29/10/2010 21:08
To: CCP4BB@JISCMAIL.AC.UK
Subject: Re: [ccp4bb] Strange spots
C'mon now! Everybody knows that frogs in real space become handsome princes
Hi Dave,
The circles are quite prominent in the inner circle (lune) that you
highlight but not in the next one. The full image is too small to see
details but I don't see any clear circular halos for any of the other
lunes. If you start with the lune going through the origin and number it
Are these very strong reflections? Do they appear on more than one image?
Are they an artefact of the detector or the image display program?
all the Helliwell book link.
Liz
From: CCP4 bulletin board on behalf of Sanishvili, Ruslan
Sent: Fri 29/10/2010 21:08
To: CCP4BB@JISCMAIL.AC.UK
Subject: Re: [ccp4bb] Strange spots
C'mon now! Everybody knows that frogs in real space become handsome
princes
The shape reminds me of the focused beam spot profile from slightly
misaligned capillary optics. I don't have too much experience with these,
but the incident beam profile does tend to propagate through to the spots
on the detector.
I wonder, could what you are seeing be a halo of minor incident
bulletin board [mailto:ccp...@jiscmail.ac.uk] On Behalf Of James
Holton
Sent: Friday, October 29, 2010 7:04 PM
To: CCP4BB@JISCMAIL.AC.UK
Subject: Re: [ccp4bb] Strange spots
The shape reminds me of the focused beam spot profile from slightly misaligned
capillary optics. I don't have too much
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