Dear Faisal, the lack of the CCanom line in the shelxc output suggests that your data are already merged, and my guess is you processed your data with HKL2000 - all other integration programs I am aware of do not merge the data at such an early stage giving you access to the CCanom Eleanor mentioned.
There might be a switch in HKL2000 to not merge the data. A CCanom >30% is a good indicator of the presence of an anomalous signal. Best, Tim On 04/26/2014 12:18 PM, Eleanor Dodson wrote: > Look at the aimless plot of CCanom . That is the best indicator I think and > very sensitive when you have such high redundancy > Eleanor > > > On 25 Apr 2014, at 22:13, Jim Pflugrath wrote: > >> <d"/sig> should be above 0.80 >> >> There seems to be plenty of signal there with all values above 1.02. We >> have solved structures with less multiplicity and lower <d"/sig>. >> >> There is a different criteria of "signal" for when you know the positions of >> the anomalous substructure atoms and when you need to find the positions of >> the anomalous substructure atoms. >> >> As for "no signal", I think I am on record that there is always an anomalous >> signal. :) But can you detect it? >> >> Jim >> >> From: CCP4 bulletin board [CCP4BB@JISCMAIL.AC.UK] on behalf of Faisal >> Tarique [faisaltari...@gmail.com] >> Sent: Friday, April 25, 2014 4:06 PM >> To: CCP4BB@JISCMAIL.AC.UK >> Subject: [ccp4bb] anomalous signal >> >> Dear all >> >> sorry about my previous mail where i forgot to mention that the data was >> collected on home source at Cuk alpha and at 1.54A. >> >> written below is the log file of an anomalous data processed through >> SHELXC..my question is ..what is the strength of anomalous signal ?? as it >> is said "For zero signal <d'/sig> and <d"/sig> should be about 0.80". Then >> in the present case is there really a signal or can be assumed no signal..we >> are expecting one Ca atom bound to the protein at its active site..the >> redundancy of the data is 11.6..with this signal strength can we assume Ca >> to be present there or whatever little anomalous if present is due to >> something else....or there is no signal at all ??... >> >> Resl. Inf - 8.0 - 6.0 - 5.0 - 4.0 - 3.8 - 3.6 - 3.4 - 3.2 - 3.0 - 2.8 - >> 2.60 >> N(data) 375 493 580 1319 450 538 679 866 1081 1414 1709 >> <I/sig> 58.8 38.6 32.6 38.3 27.7 27.2 21.9 18.4 12.6 9.5 6.1 >> %Complete 94.7 99.0 99.3 99.5 100.0 99.6 99.7 99.8 99.6 99.6 90.9 >> <d"/sig> 1.65 1.27 1.18 1.25 1.19 1.12 1.11 1.11 0.97 1.02 1.05 >> >> -- >> Regards >> >> Faisal >> School of Life Sciences >> JNU > > -- Dr Tim Gruene Institut fuer anorganische Chemie Tammannstr. 4 D-37077 Goettingen GPG Key ID = A46BEE1A
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