Abstract
Because of its low solubility it is unlikely that elemental sulfur serves as the direct substrate for sulfur-reducing bacteria. To test the hypothesis that polysulfide may represent a soluble intermediate of sulfur reduction, the maximal polysulfide concentrations formed from elemental sulfur in aqueous sulfide solutions were measured at near neutral pH and at temperatures up to 90°C. The saturation concentrations decreased by two orders of magnitude when the pH was lowered from 7 to 6 at a given temperature, and increased about tenfold when the temperature was raised from 37°C to 90°C at a given pH. The dissolution of 0.1 mM zerovalent sulfur in 1 mM sulfide (H2S+HS−) required a pH of 7.5 at 20°C and of only 6.1 at 100°C. A comparison with the growth optima of sulfur-reducers suggests that polysulfide is present at sufficient concentration at the growth conditions of the Bacteria and the moderately acidophilic Archaea. Polysulfide is apparently not available at the growth conditions of the extremely acidophilic Archaea. Alternative mechanisms for the sulfur utilization under these conditions are discussed.
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Abbreviations
- MOPS:
-
Morpholinopropanesulfonate
- PIPES:
-
1,4 piperazine-N,N′-bis(2-ethanesulfonate)
- HEPES:
-
N-2-hydroxy-ethylpiperazine-N′-ethanesulfonate
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Schauder, R., Müller, E. Polysulfide as a possible substrate for sulfur-reducing bacteria. Arch. Microbiol. 160, 377–382 (1993). https://doi.org/10.1007/BF00252224
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DOI: https://doi.org/10.1007/BF00252224