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. 2017 Sep 19;11:90. doi: 10.1186/s13065-017-0319-8

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© The Author(s) 2017

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 — The Co(II)–l-α-histidine–Himid system at molar ratio 0.3:0.75:0.3 (mmol). Dependence of pH and number of mmole O₂ bound on duration of the oxygenation reaction at a temperature of ~0°C (vertical segment corresponds to reversibility of O₂ uptake after saturation = 86.69%)