Hello all,
We currently have positions open for x-ray crystallographers at Merck
Research Laboratories in Pennsylvania. The official job posting is
pasted below, and if you are interested in applying, please apply
formally through the Merck Website with Job ID BIO001876.
http://www.merck.com/caree
Hi Jacob
You need to carefully distinguish 2 sources of inexactness: the inexactness I
was referring to is the deviation of the NCS translation from exactly 1/2 unit
cell (or other integer fraction) which causes the pseudo-absences to deviate
from zero. This gives a cosine function of the rel
Given inexact NCS, I would think that the systematic extinctions should be
less extinguished at higher resolution. Is this correct?
Jacob
***
Jacob Pearson Keller
Northwestern University
Medical Scientist Training Program
Dallos Laboratory
F. Searle 1-240
Hi Lijun,
I take your point, and you're right I've confused someone else already! I made
the NCS exact because a) I was using Eleanor's example (exactly) and was too
lazy to make it inexact, and b) making it exact makes the point equally well as
making it inexact (actually IMO better because
Ian,
Your examples may cause more confusion, especially for those beginners
with symmetry.
In your P222 and P3 cases, an exact "NCS" (0, 0, 1/2) turns to be an
exact crystallographic
translation, which reduces the unit cell to a half while the
reciprocal unit cell gets doubled. A
half of r
Vaheh,
No, unfortunately, that will not work. None of the announced 120Hz
stereo-capable LCDs are yet available on the market*. For example:
http://www.product-reviews.net/2008/08/26/viewsonic-120hz-vx2265wm-lcd-p
rototype-revealed/
Although stereo 3D-capable DLP displays are on the market, th
Jim,
The buttons work correctly in the majority of cases, and automation is
progressively improving all the time, but I think there will always be
enough cases remaining where pushing buttons produces garbage, so that
there will be sufficient demand to keep crystallographers in employment
for a wh
Ian, are you saying that one might need to know some crystallographic
theory in order to determine space groups? Or can we simply click a few
buttons in a graphical user interface and be done with it?
Jim
On Mon, 15 Dec 2008, Ian Tickle wrote:
But that only means that the SF contribution f
RE LCD monitor for stereo viewing:
No. That monitor, which looks like an ordinary 19" LCD monitor, is not
capable of stereo viewing. LCD monitors are in general not fast enough
for stereo.
There are some new technology LCD monitors which claim to be able to do
stereo, this is not one of them.
ht
I came across this LCD monitor with DVI connection. Would experts in the
field recommend this monitor for stereo viewing?
http://www.pcconnection.com/IPA/Shop/Product/Detail.htm?sku=6220485
Thank you.
___
Vaheh
To the extent this electronic communication or any of its attachments contain
there is a ccp4 utility coordconv
it can take some ractional formats and a ha file used for phasing heavy
atoms to pdb
eleanor
Anthony Addlagatta wrote:
Katja,
SHELXPRO in SHELX-97 can do this under the option "[G] Generate PDB file from .res
or .pdb".
Anthony
On Mon, 15 Dec 2008 12:07:34
moleman2, I believe, and - from CCP4 - coordconv.
Tim
--
Tim Gruene
Institut fuer anorganische Chemie
Tammannstr. 4
D-37077 Goettingen
GPG Key ID = A46BEE1A
On Mon, 15 Dec 2008, BETZ K. wrote:
Hello,
can anyone tell me,
is there a CCP4 program which calculates fractionel data into coordi
But that only means that the SF contribution from that pair of molecules in the
unit cell is zero for (00l) l=odd reflections. Depending on the
crystallographic symmetry (e.g. if it were 3-fold or higher order) there may be
other pairs for which the SF contribution is non-zero for all (00l) (b
Katja,
SHELXPRO in SHELX-97 can do this under the option "[G] Generate PDB file from
.res or .pdb".
Anthony
On Mon, 15 Dec 2008 12:07:34 -, BETZ K. wrote
> Hello,
>
> can anyone tell me,
>
> is there a CCP4 program which calculates fractionel data into coordinates
> with
> angstroem uni
Hello,
can anyone tell me,
is there a CCP4 program which calculates fractionel data into coordinates with
angstroem units?
thanks, Katja
Kay Diederichs schrieb:
>
> Hi Justin,
>
> I wrote to George privately (didn't realize that it was a CCP4BB
> posting) and repeat it here:
> "well, the plan was to release binaries that _do_ have updates, but
> the testing takes more time."
>
> There are two reasons why XDS binaries are time-limite
Postdoctoral position available in the School of Biological Sciences,
University of Liverpool
DE NOVO PHASING USING LONG X-RAY WAVELENGTHS
Salary: £30,594 pa
Duration: 1 year initially
Closing Date: 20 January 2009
Start date: Immediately available
Sulphur anomalous scattering is a large
Justin Lecher schrieb:
George M. Sheldrick schrieb:
Is it really essential to force users to update XDS every four months,
especially when "No other changes were made to the binaries"?
George
Perhaps some kind of override by an environmental variable would be
beneficial. I know this procedu
I wish I knew more about OMIT maps, but after testing Kevins procedure
(which omits overlapping sphers with perturbation) and SFCHECK (method
unknown) I got quite biased results. It is years since I have run the
full CNS/Phenix procedure which attempts to remove bias by simulated
annealing.. ma
George M. Sheldrick schrieb:
> Is it really essential to force users to update XDS every four months,
> especially when "No other changes were made to the binaries"?
>
> George
>
Perhaps some kind of override by an environmental variable would be
beneficial. I know this procedure from other scie
Plug the coordinates (x,y,z) and x+tx, Y+ty, z+tz) into the SF equation.
If the translation component along c is 0.5 say, then all the 00l
reflections for l=2n+1 will be absent.
Eleanor
Ronald E Stenkamp wrote:
Hi.
Non-crystallographic symmetry (NCS) doesn't apply to the entire
crystal,
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