Submitted By: Andrew Tolopko
Adddate: 2008-10-23 15:07:57
Stewart writes:
"For small molecule libraries, the libraries themselves are 10mM
(milli-Molar), sometimes 5 or 1 mM but always mM.  They can also be expressed
as mg/mL, but this is much less common.  They are usually screened in the nM
(nano-Molar) concentration range (i.e. this is the final concentration in the
assay plate.)

For siRNA libraries, we have stock copies at 10 and 20 µM (micro-molar) and
screening copies at 1µM.  The screeners final assay concentrations vary quite
a bit, but are all in the range of 10-100 nM (nano-molar).  

When we receive the natural product libraries, the quantity of dry stuff in the
the plates is measured in mg (milligrams)."