Fig. 2.

Degradation of polycyclic aromatic hydrocarbons by enrichment culture 1MN. a Growth of enrichment 1MN with 1-methylnaphthalene as carbon source and ferrihydrate as electron acceptor. Error bars represent standard deviation of two biological replicates. Filled circles, 1-methylnaphthalene concentrations in inoculated cultures; filled triangles, Fe(II) concentrations in inoculated cultures; open circles, 1-methylnaphthalene concentrations in abiotic control; open triangles, Fe(II) concentrations in abiotic control. b Growth with ¹³C₁₀-naphthalene as carbon source and ferrihydrate as electron acceptor. Arrows indicate the days of sampling for stable isotope probing-analysis after 72 days of incubation with ¹³C₁₀-naphthalene in early labeling experiment and 97 days of incubation with ¹³C₁₀-naphthalene in late labelling experiment. Error bars represent standard deviations of two replicates. Filled triangles, Fe(II) concentrations in cultures with ¹³C₁₀-naphthalene: black triangles—early harvested culture, grey triangles—late harvested culture; open triangles, Fe(II) concentrations in control cultures with ¹²C₁₀-naphthalene; squares, ¹³CO₂ concentration: black squares—¹³CO₂ in early harvested culture; grey squares—¹³CO₂ in late harvested culture