Gradient maker and collector needed - recommendations?

[Shiao Y. Wang]

I need recommendation for purchasing a sucrose/CsCl gradient maker and
fraction collector for virus isolation. I've been looking at a BioRad
Econo chromatography system. I was told that the pump can be programmed to
make gradients. Thanks for any recommendations and advise.

Shiao Wang
University of Southern Mississippi
sywang at whale.st.usm.edu