Someone should design a device like a compass gimbal with an extra ring
for teaching euler's angles, patent it (Gnu hardware license- world demand
is probably 100 pieces), and persuade Hampton research or MitEGen to
manufacture it.
The device (picture at (http://sb20.lbl.gov/berry/Euler2.gif),
bu
Hi,
They're likely both BME adducts, just in the first case the CH2CH2OH portion
is way more disordered.
Artem
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From: CCP4 bulletin board [mailto:[EMAIL PROTECTED] On Behalf Of
[EMAIL PROTECTED]
Sent: Monday, August 13, 2007 9:59 PM
To: CCP4BB@JISCMAIL.AC.UK
Subject: [ccp4bb]
How about this (may be way off base):
Any transformation can be seen either as moving
of the coordinates in a fixed coordinate system, or as
a "change of coordinates" and expressing the position of
the same object with respect to the new coordinates.
In molecular replacement it is convenient to
Hi,
Did you do rigid body refinement or regular minimization? If over
half your structure is missing, anything besides rigid body
refinement will probably just bias the phases toward "nothing" in the
rest of the asymmetric unit.
I've had correct molrep solutions with R-factors that high, s
Hi Lily
We have had this problem too, and it can be unpleasant! The skin is not too
much of a problem if the crystals are robust - but your's sound V fragile. We
became reasonably adept at lifting / cutting the skin off and harvesting the
(usually sadly decimated) remains. Sometimes setting
Hmmmthis explanation seems to add another discrepancy - I think the
connection to the physical process is lost -
I cannot rotate first about something I don't have yet.
Let me try to interpret what E wrote:
"I just have to write out matrices:
CCP4 rotation matrix:
[R11 R12 R13] [x]
[R21 R22
Just my own amount of salt in the Rotation function soup...
I just want to try defending the poor little Euler angles.
First, Euler invented them... Yes !
Second, only Euler angles yield a very nice interpretation of Rot Funct
symmetry in terms of space group.
See the two venerable papers:
Tollin
Dear All,
The crystals of my protein always grow from one point to all of the
direction, with very very thin plates intersecting with each other. And
also heavy skin on the surface. It is difficult to remove the skin when
mounting the crystals. The precipitant contains 25% PEGMME 5000. I
tri
Hi, ccp4 community,
I am solving my protein (300 aa) structure using molecular replacement.
The space group is P622. There is only one molecule in the ASU. The
protein is supported to have three domains. We have solved the domain 1
(120aa) structure; therefore we tried to use it as a model to solv
Hi folks
I hate to say this but I think everyone here has got it wrong to some
degree (including myself - and I hereby retract my previous e-mail and
issue the correction below!). If you don't believe me then read &
digest Jorge Navaza's article "Rotation functions" in Int. Tab. Vol. F
(sect 13
Hi Bernhard
Yes you are right, these descriptions cannot be talking about the same
overall rotation, assuming the angles are defined in the same way of
course (i.e. assuming that alpha & gamma have not been switched round in
the J.Appl.Cryst. paper you refer to). The 'Crowther' convention (used
c
Dear all, dear Bernhard,
Even when we already had an exchange by mails with Bernhard after he
sent his question, I hope it might be useful for many, especially
young crystallographers, to follow the problem.
Phil Evans writes in acta D57 1355 (2001) on p 1358 section 5.2:
"the conventio
I just have to write out matrices:
CCP4 rotation matrix:
[R11 R12 R13] [x]
[R21 R22 R23] [y]where x y z are orthogonal coordinates relative
to fixed axes...
[R31 R32 R33] [z]
represents a rotation of ccordinates by first gamma then beta then alpha
as Phil says:
[R11 R12 R13]
[R21 R22
Whats in the cif file?
Is it a set of coordinates or a library description?
Eleanor
Mark A Saper wrote:
I'm new to using LIBCHECK. I'm trying to make an appropriate library
for the MSO ligand. I have a .cif file that I downloaded from
Gerard's site. When running LIBCHECK, if I use MON MSO and
There are 3 posts available at the European Bioinformatics Institute
within the MSD group, the European Partner in the wwPDB
Software Engineer: For a 3D Electron Microscopy Project
in partnership with the RCSB (Rutgers) and Baylor College Houston
http://www-db.embl.de/jss/servlet/de.embl.bk.emblG
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