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Ultracompetent E.coli cells?

Shin Enomoto shin at biosci.cbs.umn.edu
Fri Dec 8 21:42:51 EST 1995

David L. Haviland, Ph.D. (HAVILAND at KIDS.WUSTL.EDU) wrote:

: I contacted Sratagene on that very point over a year ago.  Their reply was 
: that thier protocol for peparing the ultracomps was nothing more than a 
: modified form of the Hanahan protocol.  However, these modifications were 
: proprietary, of course, and would not be revealed - otherwise they'd loose 
: thier market share!  With standard CaCl2, I've managed only as high as 10^4 

: I'd love to find a chemical protocol that would get me 10^8 on a regular 
: basis.  I should note that 10^8 is all I've ever managed to get with 
: electroportation as well.

check out Gene96: 23

It's a modified Hanahan procedure.  More simple and reliable.  Key 
feature is growing the cells at 18C.  Kudos to the authors for checking 
all the parameters.

I don't have the authors names, sorry.  I switched to this about 2 years 
ago and have not gone near electroporators.  My all time high is 10^10.  
We routinely get 10^8. 


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