DFM inhibition of methane oxidation during aerobic incubation of Sherman Island soil. Symbols: ▵, no additions; ○, 0.001 kPa of DFM added; ▿, 0.01 kPa of DFM added; ◊, 0.1 kPa of DFM added; +, heat killed. Error bars indicate ±1 standard deviation of the mean of three soil samples. The absence of error bars indicates that the error was smaller than the symbol size.