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. 2018 Jul 17;9:1576. doi: 10.3389/fmicb.2018.01576

FIGURE 5.

FIGURE 5

Gene copies of bmoX genes (lg) in fractions of gas field soil samples (G) incubated with 12C-butane and 13C-butane showing that the bmoX genes were labeled after 12 days of incubation, since the bmoX gene numbers of the 13C-BT samples were significantly increased (p < 0.05) in the heavy fractions (1.7354 and 1.7377 g/ml) at day 12 and 14 in comparison with those at day 6 and 9. Data are averages of three replicates. Error bars represent SD, some error bars are smaller than the symbols.