Table 2.

Roughness coefficients of biofilms determine by COMSTAT.

	Roughness Coefficient -Batch		Roughness Coefficient -continuous
	Closed circuit anode	Open circuit anode
Pure culture experiments
Geobacter sulfurreducens	1.8 ± 0.3	1.0 ± 0.4	1.8 ± 0.2
Pseudomonas aeruginosa	1.8 ± 0.5	1.1 ± 0.2	1.9 ± 0.1
Shewanella oneidensis	1.7 ± 0.2	0.9 ± 0.3	1.9 ± 0.3
Clostridium acetobutylicum	1.5 ± 0.3	1.2 ± 0.3	1.7 ± 0.2
Enterococcus faecium	1.4 ± 0.2	1.2 ± 0.2	1.9 ± 0.3
Co-culture experiments with Enterococcus faecium
Geobacter sulfurreducens	-	-	0.9 ± 0.2
Pseudomonas aeruginosa	-	-	0.8 ± 0.1
Shewanella oneidensis	-	-	0.7 ± 0.1