Yanming Zhang a écrit :
> Hi,
>
> Would some experts help me to interpretate the attached self rotation
> function ps graph? The cell: 84.847 84.847 172.485 P4 indexing. In
> perticular, I was puzzled by:
>
> 1,Does the peak (90 45 180) a crystallographic 2-fold or
> non-crystallographic 2-fold?
> 2,Why there is no crystallographic peak on the section kappa=90?
> Giving P4 space group, there should be some high crystallographic
> 4-fold peaks appear on the section.
>
> It probably takes you only 5 minutes. Your help is greatly appreciated.
>
> Yanming
Deqr Yanming
The north pole of the diagramm corresponds to the direction of the z
axis. There is well a crystallographic 4-fold (and automatically 2-
fold) peak in this direction. Then there are non-crystallographic 2-fold
axes in the x,y plane, spaced by 45 degrees, as all the peaks appear to
have the same height.
Greetings
Wim Burmeister
--
*******************************************************************************
Wim Burmeister
Professeur, Membre de l'Institut Universitaire de France
Unit of Virus Host Cell Interactions (UVHCI) UMR5233 UJF-EMBL-CNRS
6 rue Jules Horowitz
B.P. 181, F-38042 Grenoble Cedex 9 FRANCE
E-mail: [log in to unmask]
Tel: +33 (0) 476 20 72 82 Fax: +33 (0) 476 20 94 00
http://www2.ujf-grenoble.fr/pharmacie/laboratoires/gdrviro
*******************************************************************************
|