TABLE 2.

Thicknesses of zones of APase expression under different gaseous conditions

Atmosphere	Mean biofilm thickness ± SD (μm)	Mean APase band thickness ± SD (μm)
Ambient air	117.13 ± 11.54	29.89 ± 4.39
N2	142.04 ± 19.14	1.82 ± 3.11
O2	150.59 ± 30.61	46.43 ± 5.72