Respected Mam, I used Cadmium at home source 1.54179Ang. For detecting the anomalous peaks CAD and FFT was used. It has Se also. So while refining the occupancies of Cd, Se, S and P are also refined.
Thanking you Respectfully Kavya > Not sure I follow you completely.. You dont say what anom scatterer you > expect, or what the wavelength is. > > 1) How did you find the anomalous peaks? If from an anomalous difference > Fourier there will inevitably be noise. > In practice when there are S to check this can be very helpful in deciding > on noise levels. You can be pretty sure > that SG and SD are indeed S, and if the wave length is appropriate, that > they should show some anom. signal. > > One often finds the well defined S show up well. then there is a grey area > wher they are down amongst noise but still appear. It often highlights how > many MET are in alternate conformations.. > > If possible I like to use these as bench marks for P. But in my experience > the P are often even weaker - maybe the ligand is not fully occupied, or > the P temp. factors are higher? > > > > > > > > > On 24 April 2013 10:56, Kavyashree Manjunath <ka...@ssl.serc.iisc.in> > wrote: > >> Dear users, >> >> After detecting the anomalous peaks in a data, Is it >> necessary that there will be an anomalous atom in most >> of the peaks? >> >> In a particular case, a low ranking peak was assigned >> an anomalous atom because it was present in the native >> structure, while a peak with a rank higher than this >> one did not correspond to anomalous position in native >> structure. >> >> For eg. Peak 15 in ligand bound structure corresponds to >> the anomalous position in native structure, so anomalous >> atom was assigned. >> But Peak 3,4 in ligand bound structure does not correspond >> to anomalous position in native structure but it is present >> near the ligand which is beta and gamma Phosphates of ATP. >> The question is whether It is ATP or AMP and 2 anomalous >> atoms? >> >> Thanking you >> Regards >> Kavya >> >> >> -- >> This message has been scanned for viruses and >> dangerous content by MailScanner, and is >> believed to be clean. >> > > -- > This message has been scanned for viruses and > dangerous content by MailScanner, and is > believed to be clean. > > -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.
