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. 2019 May 24;12:131. doi: 10.1186/s13068-019-1470-3

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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. 2 — Nitrate consumption (a), cell growth (OD₅₆₀, b), pH variations (c), biomass, carbohydrate or protein concentrations (d), carbohydrate or protein content (e), and biomass or carbohydrate productivity (f) of Arthrospira platensis cultivated under nitrogen-limited conditions in industrial-scale raceway ponds. The white and black regions on the top denoted natural light and dark periods of a diurnal cycle, respectively. The data represented the average values of two independent replicated cultivations and the bars showed the standard deviations (mean ± SD)