Fig 1.
(A) Mechanism for MIC by SRB due to utilization of extracellular electrons from iron oxidation for intracellular sulfate reduction [10], and (B) schematic illustration of DET and MET.
Fig 2.
D. vulgaris biofilms on (A) stainless steel 304 coupon surface and (B) carbon steel C1018 surface after 7 days of incubation with a much higher sessile cell density in ATCC 1249 culture medium.
Table 1.
Composition of ATCC 1249 medium for SRB.
Fig 3.
Planktonic D. vulgaris cell counts after 7 days of incubation with and without electron mediators.
Fig 4.
Specific weight loss after 7 days of incubation (error bars representing standard deviations).
Fig 5.
Surface morphology (biofilm removed) under SEM after 7 days of incubation: (A) SRB culture without a mediator, (B) SRB culture with 10 ppm FAD, and (C) SRB culture with 10 ppm riboflavin.
Fig 6.
Largest pits in terms of horizontal surface diameter after 7 days of incubation for: (A) SRB culture without a mediator, (B) SRB culture with 10 ppm riboflavin, and (C) SRB culture with 10 ppm FAD.
Fig 7.
Largest pit depth on a coupon without a mediator after 7 days of incubation was 10.4 μm.
Fig 8.
Largest pit depth on a coupon with 10 ppm riboflavin after 7 days of incubation was 22.2 μm.
Fig 9.
Largest pit depth on a coupon with 10 ppm FAD after 7 days of incubation was 20.2 μm.