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. 2018 Apr 7;11:102. doi: 10.1186/s13068-018-1097-9

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© The Author(s) 2018, corrected publication June 2018

Open AccessThis 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. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 3 — 2-Heptyl-3-hydroxy-4(1H)-quinolone (PQS) and 2-heptyl-4-quinolone (HHQ) precursor concentrations under varying pH, salinity, light, and temperature in co-culture (T-PB) conditions at lag phase (day 3), log phase (day 9), and stationary phase (day 15). The values are presented in mean ± SD (n = 2). Error bars are showing SD. HHQ and PQS were below detectable range at 00 h of the experiment