BIIIIG problem with top-agarose

Bill Alexander ALEXANDERW at
Mon Nov 6 12:10:45 EST 1995

>In article <47fj07$n4v at>,
>Hilde Nilsen  <hilden at> wrote:
>>Hallo reader
>>I am screening a genomic lambda libary. I am using host cells without
>>The problem is that as I am transferring the plaques to Hybond N+ membranes, 
>>the top-agarose adheres to the membrane thereby ruining everything.
>>I suspect this to happen because of moisture between the top-agarose and the
>>So, what can I do to prevent this? I am cooling the medium to 50 deg. celsius
>>preparing the plates so too hot medium should not be the problem.
>i have two suggestions for you.
>1) try to use plates that have been 'cured' for a day or two so that
>they are not to wet when you apply the top agar.
>2) this is what i usually do to prevent the top agar from lifting off.
>i just cool the plates to 4 deg C after the plaques have grown and i
>have not had any problems with it lifting off when i do this.
>- -pjf
Maniatis also used to suggest using Agarose instead of agar to make your top
Bill Alexander                                
ALEXANDERW at                                                    

     "640K ought to be enough for anybody." -- Bill Gates, 1981

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