Figure 4Continued application of H2S inhibitors effective limits H2S production in microcosms cultures. Headspace H2S from microcosms 7 days after subculture from parent cultures with A) no, B) nitrate, C) molybdate, or D) combined supplements and subsequent treatment with no (brown), nitrate (yellow), molybdate (aqua), or combined (teal) supplementation. Error bars represent standard deviation, n=3. Additional comparisons and statistical analysis are shown in Supplemental Figure 5.