Test the diffraction - that's the only way.  But given the other junk in the drop, chances are they're salt.

(And don't post 5Mb attachments, please.)


On 07/02/2013 22:24, amro selem wrote:
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Hallo my colleagues.
 i hope every one doing ok . i did screening since two weeks . i noticed today this crystals. i don`t know either it salt or protein crystal . my protein has zero tryptophan so i could distinguish by UV camera.
the condition was conditions: 
0.1M SPG buffer pH 8 and 25%PEG 1500. in addition to Nickle chlorid 1mM.
 

best regards
Amr