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. 2019 Nov 11;12:266. doi: 10.1186/s13068-019-1608-3

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© The Author(s) 2019

Open Access This 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 — Long-term H₂ photoproduction in 1-L BlueSens photobioreactors. a Picture of the BlueSens 1-L photobioreactor measuring system. The bioreactors were continuously illuminated at 180 µmol photons m⁻² s⁻¹. Cultures of HydA1+ (n = 8) and 3 HS clones: HS-14 (n = 5), HS-40 (n = 3) and HS-62 (n = 3) (black, green, blue and red, respectively) were measured. TCD sensors (BlueSens) were used to monitor. b O₂ accumulation and c H₂ accumulation in the bioreactor headspace. Error bars are in SE. The inset in (c) is a zoomed window of the blue, red and black traces. d Corresponding cell density of the different clones under the bioreactors anoxic mixotrophic conditions, measured in A_880nm by Hamilton Dencytee sensor. e Cell density of the different clones under aerobic mixotrophic conditions, measured in A_680nm. Cultivation was performed in Multi-Cultivator MC 1000-OD under constant illumination of 180 µmol photons m⁻² s⁻¹ (n = 4)