George points out that the quote I referred to did not make it to the BB
-- here we go, read below and learn, it is a most succinct summary.
phx
-------- Original Message --------
Subject: Re: [ccp4bb] reference for "true multiplicity"?
Date: Tue, 14 May 2013 09:25:22 +0100
From: Frank von Delft <frank.vonde...@sgc.ox.ac.uk>
To: George Sheldrick <gshe...@shelx.uni-ac.gwdg.de>
Thanks! It's the Acta D59 p688 I was thinking of - start of discussion:
"The results presented here show that it is possible to solve
protein structures using the anomalous scattering from native
S atoms measured on a laboratory instrument in a careful but
relatively routine manner, provided that a sufficiently high
real redundancy is obtained (ranging from 16 to 44 in these
experiments). Real redundancy implies measurement of
equivalent or identical re¯ections with different paths through
the crystal, not just repeated measurements; this is expedited
by high crystal symmetry and by the use of a three-circle (or )
goniometer."
Wise words...
phx
On 14/05/2013 08:06, George Sheldrick wrote:
Dear Frank,
We did extensive testing of this approach at the beginning of this
millenium - see
Acta Cryst. D59 (2003) 393 and 688 - but never claimed that it was our
idea.
Best wishes,
George
On 05/14/2013 06:50 AM, Frank von Delft wrote:
Hi, I'm meant to know this but I'm blanking, so I'll crowdsource
instead:
Anybody know a (the) reference where it was showed that the best SAD
data is obtained by collecting multiple revolutions at different
crystal offsets (kappa settings)? It's axiomatic now (I hope!), but
I remember seeing someone actually show this. I thought Sheldrick
early tweens, but PubMed is not being useful.
(Oh dear, this will unleash references from the 60s, won't it.)
phx
