Mineralization of [14C]benzo[a]pyrene by fungal cultures, by activated sludge, and by both. Zero time was the time when benzo[a]pyrene was added to the 6-day-old fungal cultures; at day 15 activated sludge was added. Symbols: ■, fungus; ▴, fungus plus activated sludge; •, dead fungus plus activated sludge plus intact [14C]benzo[a]pyrene.