Figure 2: Emulsion stability reached by equal volumes of kerosene and cell-free supernatant after cultivation of Pseudomonas aeruginosa LBBMA 88A, Bacillus sp. LBBMA 111A, Bacillus subtilis LBBMA 155, Dietzia maris sp. LBBMA 191 and Arthrobacter oxydans LBBMA 201 isol ates, in minimal medium supplemented with 2% oily sludge as carbon source at 30°C, and 200 rpm for seven days.