I follow the following protocol to grow my bl21de3/bl21de3-plysS

1. 10ml of MDAG-135 primary media to be inoculated with a single colony. (6 to 9 hours upto O.D = 0.6 to 1.0)

2. 100ml M9 to which the cells from 10ml MDAG primary is added after spinning downand discarding the supernatant. (Overnight)

3. transfering the 100ml media to 1000ml M9 Secondary.

Has anyone tried inoculating the colony into a 50ml MDAG for overnight growth and then directly transfer to M9? 

What is the advantage in the 3 step protocol as against the two step protocol. 

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