[Babcock_Hall]

A student whom I know wishes to do some DNA melting experiments, following them by UV/VIS spectrophotometry.  What sort of solvent should she use for a recirculating bath?  I have used ethylene glycol/water for low temperature work, but I have not done much high temperature work.  So far I have not been able to turn up a good techniques-based article.

[Yggdrasil]

For very high temperature applications, silicone oil a good choice for heating baths (up to ~ 200^oC, though I suspect you won't need to go that high).  You'd probably be able to go up to at least 90^oC with water or ethylene glycol/water, though I'd check the manual for your recirculating bath for recommended solvents.