For the control without nanoFe 3 O 4 , 430 bp showed a trend of increasing first and then decreasing with the DNA buoyant density ( Figure 5C ); the 305 and 167 bp was secondary dominated in the non-labeling and labeling treatments, respectively.
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NanoFe<sub>3</sub>O<sub>4</sub> as Solid Electron Shuttles to Accelerate Acetotrophic Methanogenesis by <i>Methanosarcina barkeri</i>.
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