Aqueous dispersion tests. Octadecane (99% pure) was
purchased from Aldrich Chemical Co. (Milwaukee, Wis.).
[14C]Octadecane, labeled at the C-1 position (specific activity,
3.6 mCi/mmol; 98% pure), was obtained from Sigma.
A1propriate amounts of a mixture of octadecane and
['C]octadecane (0.78 g/liter, with a specific activity of 15
,uCi/mmol for rhamnolipid dispersion tests; 1 mg/liter, with a
specific activity of 1.1 mCi/mmol for determination of the
solubility of octadecane in water) in chloroform were added
to test tubes (16 by 100 mm).