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. 2019 Dec 31;9:20416. doi: 10.1038/s41598-019-56882-1

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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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(a) Dissolved oxygen (DO) changes during the growth of M. aeruginosa PCC7806 under the light and dark conditions for 60 h. In M. aeruginosa PCC7806 cultures, DO increased in the light condition and decreased in the dark condition. Cell supernatant was extracted at 12 h and 24 h (red arrows). (b) The standard curve for the acetate concentrations in HPLC analysis. (c) The HPLC analysis results showed that the concentration of acetate was much higher in the dark condition than in the light. (d) Growth curve of Rhizobium sp. MK23 under 0.1% acetate.