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Gene Pizzo UCONN Health
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From: Hector Nolla
To: cyto-inbox
Cc: Cytometry Mailing List
Subject: Re: Increasing Cytoplasmic fluorescence
Date: Thursday, November 07, 1996 8:19AM
Dear Walter,
This may be only a coincidence but what you described is similar to the
"intracellular" fluorescence intensity drift that we sometimes get from
DNA stains like Hoechst and PI. In our case, fluorescence intensity can
either go up or down(most of the time it goes up), skewing the
fluorescence peak and thus increasing CV's, which can be a real "bummer"
if you intent to do cell cycle analysis. This fluorescence intensity drift
can be reduced if we let the sample equilibrate in the sample tubing(by
either running the sample for 30 seconds to 1 min, or by stopping sample
flow thus allowing the sample to remain in the sample tubing).
My best definition for this phenomena is "sample tubing equilibration",
however, this is only "hearsay". Maybe someone out there could shed some
"specific light" as to why this happens? Thanks.
Hector Nolla
Department of Oceanography
University of Hawaii
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CD-ROM Vol 3 was produced by Monica M. Shively and other staff at the
Purdue University Cytometry Laboratories and distributed free of charge
as an educational service to the cytometry community.
If you have any comments please direct them to
Dr. J. Paul Robinson, Professor & Director,
PUCL, Purdue University, West Lafayette, IN 47907.
Phone: (765)-494-0757;
FAX(765) 494-0517;
Web