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PCR Tubes -- Help!

Patricia Foster pfoster at bu.edu
Tue Jul 5 15:37:11 EST 1994

Dear Netters,
    And now for something completely different.  We buy our PCR tubes 
from Perkin Elmer.  These are the regular 0.5ml, thick-walled tubes, part 
N8010180.  We have for some time been using a large supply that we 
ordered last summer.  Recently we started using some that were 
purchased last December and discovered that, when autoclaved, the 
caps will not stay shut.  Upon careful inspection, you can tell that the 
caps are significantly more loose even before autoclaving -- they don't 
snap like the old ones do.  We have contacted Perkin Elmer and they 
sent us another lot that have the same problem.  They deny that any 
change in production has occurred.
    We are not crazy!  These tubes are different, and are totally useless if 
autoclaved.  Obviously, we are currently using them without autoclaving, 
but this is not a permanent solution.  Also, I use 35S in cycle- 
sequencing and had never had any contamination with the old tubes; 
now I am very worried about the new ones.
   Anyone else out there notice this.  And are there alternative sources of 
Patricia L. Foster
Boston University School of Medicine
Boston, MA USA
pfoster at bu.edu

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