TABLE 3.

Statistical comparisons of live-dead analyses for biofilm communities by treatment group

Treatment	Live-dead comparisons (μm3 μm−2 of bacterial cells)a
	Live	Dead	Live/dead ratio
Control	1.0a	0.55ab	1.8
Ni	0.24a	0.09a	2.7
CNP	2.5b	0.73b	3.5
CNP, Ni	1.3ab	0.62ab	2.1
Low O2	0.31a	0.11ab	2.8
Low O2, Ni	0.16a	0.05a	3.2
Low O2, CNP	1.4ab	0.39ab	3.6
Low O2, CNP, Ni	0.51a	0.16ab	3.2

^aValues in a column followed by the same lowercase letter are not significantly different from one another (P < 0.05).