QDot Phenomenon

Paul Champoux champ004 at umn.edu
Mon Feb 27 14:44:51 EST 2006

Hello all,

I recently ran some SA-QDots on our LSR 2 with a 50mW Violet 405  
laser and saw a strange phenomenon. I was displaying a bi-exponential  
histogram of the detector of interest and saw a large number of  
events showing up in the area below zero. However, after 5 seconds or  
so, these events slowly shifted above zero and came into alignment  
with the negative population.
We were staining normal mouse lymph node cells for CD4 with QDots  
525, 565,585, 605,655 and 705(the sampler kit available from the  
vendor). This phenomenon occurred in all the QDot samples. The	
emission filters used were a mixture of QDot specific filters and  
stock filters from the LSR 2 supply.

Has anyone else noticed this while running any QDot stained samples?

Paul E. Champoux
Research Services Coordinator
Center for Immunology
University of Minnesota
612 626-3068
612 625-2199(Fax)

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