Howard Petrie writes: >We have had our instrument [B-D LSR] for about 3-4 months, and at times >(see below) >the data have been incredibly good, with DNA cv's of 3-5% and no >discernable noise (HeCd lasers must have improved significantly). So far, so good, but the noise problem with a He-Cd laser typically arises after months of operation. I have pretty consistently gotten DNA CV's under 2% (assuming the cells are that good) with new He-Cd lasers, even those made ten and more years ago. For what it's worth, my newest He-Cd is pretty much the same model I am told is used in the LSR, and, while it has gotten somewhat noisier over its time in operation, it is better than the older ones. Running a He-Cd a few hours a week is the best way to slow down the development of the noise problem, and it sounds as if that will happen automatically in Howard Petrie's lab. The prognosis is good. -Howard Shapiro
This archive was generated by hypermail 2b29 : Sat Mar 10 2001 - 19:31:10 EST