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. 2017 Apr 20;8:683. doi: 10.3389/fmicb.2017.00683

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Copyright © 2017 Li, Kappler, Jiang and Bond.

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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Cell density, oxygen and pH profiles occurring in a corrosion layer developed on the surface of a cement coupon exposed to sewer conditions for 1 year (Okabe et al., 2007). (A) Density profiles of cells detected in the gypsum layer. The non-specific DAPI stain and the specific probes Thio820, ACD840, and LF655 target Acidithiobacillus spp., Acidiphilium spp., and Leptospirillum spp., respectively. (B) Concentration profiles of dissolved oxygen and pH in the top 2,000 micrometers of the corrosion layer (Okabe et al., 2007) (reproduced with permission from American Society for Microbiology).