Influence of a fixed nitrogen source on hydrogen oxidation by Beggiatoa sp. 35Flor (Fig. S1); test for hydrogen oxidation by Pseudovibrio sp. FO-BEG1 (Fig. S2); Beggiatoa sp. 35Flor and Pseudovibrio sp. FO-BEG1 protein content in oxygen-sulfide gradient cultures over four weeks of incubation (Fig. S3); H2S, pH, and total sulfide profiles in Beggiatoa sp. 35Flor cultures with a high level of sulfide flux (Fig. S4); development of the hydrogen consumption rate normalized to Beggiatoa sp. 35Flor biomass or mat volume over four weeks of incubation in the presence of a low level of sulfide flux (Fig. S5).
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