Fig. 8.

Relative T-RF abundances and relative number of rRNA gene copies distribution in comparative CsCl density-gradient centrifugations of DNA extracted from the 1-methylnaphthalene-degrading, iron-reducing enrichment 1MN incubated with either ¹³C₁₀-naphthalene (a, c) or ¹²C₁₀-naphthalene (b, d) at 72 h of cultivation (a, b) and 97 days of cultivation (c, d). Distribution of bacterial 16S rRNA genes within density gradient fractions was quantified by real-time qPCR; relative number of rRNA gene copies distribution was calculated for all twelve collected fractions, but only presented here for the fractions for which T-RFLP analysis was performed