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Fig. S1. (A) Growth coupled to lactate oxidation and chlorate reduction by a reinoculated culture of A. suillum in unfiltered spent broth after the initial sulfide oxidation was complete. The results depicted are the average of triplicate cultures. (B) Growth coupled to lactate oxidation and chlorate reduction by a reinoculated culture of A. suillum in 0.22 μm filtered spent broth after the initial sulfide oxidation was complete. The results depicted are the average of triplicate cultures.

Fig. S2. Growth coupled to lactate oxidation and chlorate reduction by the static H2S-oxidizing culture of A. suillum when it is used to inoculate fresh BM amended with lactate (10 mM) and chlorate (10 mM).

Fig. S3. X-ray absorption near edge structure (XANES) spectroscopy of washed culture retentate of A. suillum initially and after 24 h incubation in the presence of H2S and chlorate.

Fig. S4. EDX spectra confirming three sulfur inclusions in A. sullium on the carbon film support. Chemical analyses of the whole mount bacterial cell TEM samples were carried out in a JEOL 2100-F 200 kV Field-Emission Analytical Transmission Electron Microscope (TEM) equipped with Oxford INCA Energy Dispersive Spectroscopy (EDX) X-ray detection system at the Molecular Foundry at LBL. EDX spectra were acquired for 60 live seconds with a 0.4 μm probe at 200 kV.

Appendix S1. Supporting information text.

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