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Hi, thank you very much for your excellent job! And I have a question, at 1'43'', what is the work frequency of the machine? Thank you！
Do we need to add DNase?
![[Biol 515] Module 1 - Part A: RNA Extraction from E. coli](http://i.ytimg.com/vi/sIR3YVPK6IQ/mqdefault.jpg)
![[Biol 515] Module 1 - Part A: RNA Extraction from E. coli](/img/tr.png)
Hi, thank you very much for your excellent job! And I have a question, at 1'43'', what is the work frequency of the machine? Thank you！
Do we need to add DNase?