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. 2019 Mar 14;12:53. doi: 10.1186/s13068-019-1391-1

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© The Author(s) 2019

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. 5 — Excitation-emission matrix fluorescence spectra of Spirulina subsalsa medium containing seawater and MSGR, at the beginning of a first use, b second use and c third use. Region A: humic-like substances, Region B: fulvic-like substances