Jan wrote:

> Yes,
> there is an excellent tutorial on crystallography by Bernhard Rupp
> http://www-structure.llnl.gov/Xray/101index.html
> e.g.
> http://www-structure.llnl.gov/Xray/tutorial/serial.gif

Yes indeed! This looks very good for me.

>>Q: I don't want to go into too much detail on this yet, but can someone
>> tell me what the general scheme is for naming one of these reflection /
>> rotate / spacegroup copies that is within the unit cell ?
>>
>>
> I don't know, in Swiss PDB Viewer Deep View you can address them by
> clicking on the symmetry operations belonging to a space group
> http://au.expasy.org/spdbv/text/xsymtut.htm
> But there could be build numbers out of this see the PDB file 1gu8
> (NNNMMM N->operator M->translation vektor)

I don't really understand this.


[snip]
>>Now, Jmol already has some support for holding more than 1 copy of the
>> same thing. PDB files have the concept of a 'model' that is supposed to
>> be multiple copies of what is fundamentally the same thing.
>>
>>
> no,
> models exist in a "parallel world" or at an other time point,

Oh well, so we need separate data structures.

> the
> molecules in the unit cell or multicell ?box of unit cells?
> may interact
>  with each others, e.g. H-bonds

Correct ... of course.


> e.g. 1gu8
> http://www.imb-jena.de/cgi-bin/SCOPlnk.exe?JMOL=1gu8

Good example


Thanks,
Miguel





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