Abstract
A strain of Mycobacterium, that is able to degrade fluorene, phenanthrene, fluoranthene and pyrene was grown on various mixtures of these substrates. The polycyclic aromatic hydrocarbons (PAH) were provided either as crystals or solubilized by a surfactant. Mixed PAH were degraded simultaneously, but not in parallel, indicating that the degradation pathways were not incompatible. Certain interactions of the substrates were observed. For example, the degradation of solubilized pyrene was delayed in the presence of fluorene and enhanced in the presence of phenanthrene. Fluorene was degraded cometabolically with the other PAH serving as growth substrates, but not as the only source of carbon. The utilization of phenanthrene occurred at the fastest rate and was not affected by the presence of fluorene, pyrene or fluoranthene.
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