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. 2017 Aug 29;8:1573. doi: 10.3389/fmicb.2017.01573

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Copyright © 2017 Okpala, Chen, Fida and Voordouw.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Effect of addition of nitrate, of nitrate and tNRB, or of nitrite on tSRB activity during continuous culture conditions at 60°C. The concentrations (mM) are shown as a function of time (days) for (A) sulfate and sulfide in chemostat F (CF), (B) nitrate and nitrite in CF and (C) sulfate and sulfide in chemostat B (CB). CF was injected with medium containing lactate and sulfate. This was switched to medium with lactate, sulfate and nitrate as indicated; tNRB were added as indicated (↓). CB was injected with medium containing lactate and sulfate with addition of 0.125, 0.250, and 1.0 mM of nitrite as indicated. Note that the time scale is not linear.