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. 2016 Aug 4;9:165. doi: 10.1186/s13068-016-0556-4

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© The Author(s) 2016

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 — Influence of inoculum nitrate concentration and nitrogen feeding factor $N_{D}$ on biomass (top), $β$ -carotene fraction (middle) and total $β$ -carotene amount (bottom). For the experiment, inoculum nitrate concentration was at $0.08 g / L$ . We thus chose $N_{D} = 0.02 g_{N} L^{- 1} h^{- 1}$