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Another explanation suggested by Sven Hovmöller. He is not on the CCP4 list, I forwarded the message to him: Hej Salam (translated from Swedish means Hi Salam!) Very nice. Obviously a superposition of a small number (3?) of nice monocrystals, related by 2- or 3-fold rotations. I think it can be indexed without great problems. No it is not modulated, I don't think. sven Salam Al-Karadaghi Molecular Biophysics, Lund University 221 00 Lund Sweden ----- Original Message ----- From: Harry Powell <[EMAIL PROTECTED]> Date: Friday, February 3, 2006 4:36 pm Subject: Re: [ccp4bb]: Curious diffraction pattern - non CCP4 related > *** For details on how to be removed from this list visit the *** > *** CCP4 home page http://www.ccp4.ac.uk *** > > > > lovely. might it be due to an incommensurate modulated phase? > > > Dear all, > > > > I would like to share with you a very strange diffraction pattern > > that I recently collected at the SLS. > > > > You can have a look at some pictures of this diffraction pattern > here:> > > http://tiagobarros.home.sapo.pt/zoom_in.png > > > > http://tiagobarros.home.sapo.pt/45.png (45 degrees) > > > > http://tiagobarros.home.sapo.pt/90.png > > > > http://tiagobarros.home.sapo.pt/135.png > > > > Some additional information. These happened with just one of my > > crystals. I know from previous experience that my crystals (from a > > membrane protein) are made of stacks of 2D crystals (SG P321). This > > stacking is very often not that ordered, which leads to different > > layers with different orientation within the same crystal. The space > > group of my crystals is usually either C2 or P3121. > > > > I've found these circular motif of spots very curious, and I don't > > really have a good explanation for them. > > > > Any idea of what might have caused this? > > > > Thank you. > > > > Tiago > > > > > > > ************************************************************************> * > > > > Tiago Barros > > Max-Planck Institute of Biophysics > > Dept. of Structural Biology > > Max-von-Laue Str. 3 > > D-60438 Frankfurt > > Germany > > > > tel: +49-69-6303-3055 > > > > > ************************************************************************> * > > > > > > > > > > > > Harry > -- > Dr Harry Powell, MRC Laboratory of Molecular Biology, MRC Centre, > HillsRoad, Cambridge, CB2 2QH > > >
