Biosurfactant production during growth on PAHs. In the study of biosurfactant production on PAHs with strain 19SJ,
starting the cultures with washed cells compared with whole culture broth affected the kinetics of biosurfactant production,
cell behavior, and naphthalene degradation. Glycolipid accumulation(expressed as rhamnose equivalents) was delayed
when washed cells were used as inoculum (Fig. 2a) instead of whole culture broth (Fig. 2b). However, enough glycolipids
were secreted at the end of the exponential growth phase to cause an important drop in surface tension (Fig. 2a).