Hello everyone sorry for the intervention with some basic questions regarding twinning
In continuation with the discussion with Liang i would like to ask a question which i faced..i have also solved a structure and the statistics depending on twin laws as described through xtriage, phenix is as follows: operator k,h,-l type pseudomerohedral brotton alpha 0.019 h alpha 0.023 m alpha 0.22 it seems the probable twin fraction in my case is 0.2, now the question is does it mean that in another twin domain ie. twin operator h,k,l the twin fraction will be 0.8 ? On Tue, Mar 26, 2013 at 9:07 PM, vellieux <[email protected]> wrote: > Hello, > > I would suggest to use several tools (in addition to Phenix's) - CCP4's > detwin, the plots generated by truncate before detwinning, the Yeates > twinning server and there might be others - to get a good idea of what the > twinning fraction is. > > Here we've had success using CCP4's detwin to "detwin" diffraction data. > The resulting mtz file is not equivalent to an mtz file containing data > recorded from an untwinned crystal - this detwinning operation is not a > perfectly accurate operation... In our case we used the estimate of the > twinning fraction obtained from Phenix (which was lower). > > HTH, > > Fred. > > > On 26/03/13 15:45, Liang Zhang wrote: > > Hi, All, > > I got a set of P2(or P21) data for MR. However, the Phenix-Xtriage > indicated that it could be a pseudo-merohedral twinning. Does anyone know > how to deal with such kind of twinning problem? Thanks. > > Best, > > Liang > > > > -- > Fred. Vellieux (B.Sc., Ph.D., hdr) > ouvrier de la recherche > IBS / ELMA > 41 rue Jules Horowitz > F-38027 Grenoble Cedex 01 > Tel: +33 438789605 > Fax: +33 438785494 > > -- Regards Faisal School of Life Sciences JNU
