Figure 1.

Nitrate and perchlorate are specific inhibitors of sulfate reduction in marine enrichment cultures. (a–b) Growth (closed symbols) and sulfide (open symbols) after 48 h in marine enrichment growth cultures in the presence of varying concentrations of (a) nitrate and (b) perchlorate as a percent of uninhibited control cultures. Concentrations are presented on a log₁₀ scale (c–d) Bacterial phyla observed by 16S amplicon sequencing of marine enrichment cultures after 48 h in the presence of varying concentrations of (c) nitrate and (d) perchlorate versus a no inhibitor control. Concentrations are presented on a log₁₀ scale. The sole Proteobacterial genera observed was Desulfovibrionales (Supplementary Dataset S1).