Figure 7.

Denaturing gradient gel electrophoresis analysis of thaumarchaeal (a, c) and bacterial (b) amoA genes during DNA-SIP microcosms of HZ soil incubated with ¹³C-CO₂ or ¹²C-CO₂ in the presence or absence of DCD. Thaumrchaeal amoA gene PCR products of twenty fractions of genomic DNA from individual centrifuge tube were subjected to DGGE for changes of different thaumarchaeal communitys for 15 or 30 days (b). Eight arrows marked the bands in heavy fraction around a buoyant density of 1.73 g ml⁻¹ excised for sequencing.