Fig. 1. Transformation of 0.4 mM TNT (T) in the presence and absence of anaerobic microorganisms (M), laccase (L, from Trametes villosa), humic acid (H, from Hagerstown soil, 100 mg L^-1), and catechol (C, 40 mM) after four days incubation at anaerobic conditions and subsequent two days of aerobic conditions, respectively.