plating from chlor onto amp

Frederik Wirtz-Peitz fw218 at
Sun Jul 15 17:52:29 EST 2001

Dear all,

I am trying to clone an insert which contains a chloramphenicol marker into
a vector which features an ampicillin marker. I plated my ligation onto
chlor plates, then streaked out individual colonies on an amp plate, from
which I picked colonies for mini-prep. I am now worried that, since chlor
isn't lethal but only inhibits growth, there may be significant background
of re-circularized vector on the amp plates (defeating the purpose of
plating on chlor in the first place). Does anyone know if this is a valid
concern? (I only just set up the mini-preps so I don't know the result yet.)


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