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. 2019 May 13;2:179. doi: 10.1038/s42003-019-0418-2

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 2 — Dynamics of reactor performance parameters and microbial community structures in the two reactors. a Total organic carbon; b transmembrane pressure and effluent flow rate; c concentration of dissolved oxygen in sludge; and d–i concentrations of the following hydrocarbons in sludge: d, g naphthalene; e, h phenanthrene; f, i, alkane. Displayed hydrocarbon concentrations are mean values of duplicate measurements. j Scatter plot of principle-coordinate-analysis of 16S rRNA gene sequences conducted on the basis of the weighted UniFrac distance, generated by QIIME³². Distances between points denote similarity of microbial community structure, with smaller distances indicating greater similarity. Foreground points denote days 1, 20, 29, and 37, which correspond to start of operation and three time-points of RNA-seq analyses, respectively. For all panels, red and blue symbols or bars indicate reactors 1 and 2, respectively