[ccp4bb] is there any DNA?

[Qing Shi]

Dear all,

We all know that for purified protein, A260/A280=0.5, and for purified DNA,
A260/A280=1.8. Now my protein A260/A280=0.75, So I wonder if there is DNA
mixed with protein? Is there any way I can use to test if there is DNA?

Thanks~