[ccp4bb] How to get anomalous signal for Ca

2009-06-30 Thread xianchidong
Dear All: When I solved the crystal structure of protein, I found a metal binding in it. But however, I can not decide which type of atom it is. I tried ICP-AES and the result suggested the protein contained Ca. I tried to get anomalous signal at the wavelength of 2.07A. And I collected the

Re: [ccp4bb] How to get anomalous signal for Ca

2009-06-30 Thread Jens Preben Morth
Dear Xianchidong If you are sure it is a divalent ion, Mg would be hard to detect even at a wavelength of 2.07A. best Preben xianchidong wrote: Dear All: When I solved the crystal structure of protein, I found a metal binding in it. But however, I can not decide which type of atom it is. I