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. 2016 Apr 7;23:14231–14239. doi: 10.1007/s11356-016-6566-8

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© The Author(s) 2016

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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.

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Fig. 6 — Phylogenetic tree of bacteria Citrobacter freundii strain Z4 (a). Concentration of particular PEG homologues (represented as the peak area) at day seven and at the beginning of the biodegradation test of surfactant C₁₂E₁₀ with bacteria Citrobacter freundii strain Z4. Inoculum was augmented on sterilized river water (b). As Fig. 6c with inoculum augmented on an artificial sewage