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Table 1 Biomass adhering to pumice granules after 6- and 12- month operation

From: Characterization and performance of a toluene-degrading biofilm developed on pumice stones

Operation time (months) Total biomass (mg cells d.w. g-1 pumice)
  Burning Protein assay
6 2.86 3.40
12 (top) 9.52 3.25
12 (bottom) 12.58 6.44