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. 2016 Mar 12;9:60. doi: 10.1186/s13068-016-0478-1

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© Niu et al. 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. 4 — Lipid productivity in P. tricornutum. a Neutral lipid content as per 10⁶ cells determined by Nile red staining. b Total lipid content in dry cell weight determined by gravimetry. c Total lipid content as per culture volume. d Neutral lipid content under N-deprivation. Significant difference between control and treatment groups is indicated at P < 0.05 (*) or P < 0.01 (**) level. Each value represents mean ± SD (n = 3)