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. 2022 Oct 28;21:225. doi: 10.1186/s12934-022-01945-8

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© The Author(s) 2022

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. 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 in a credit line to the data.

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Fig. 3 — Dissolved oxygen measurement in bioreactors throughout cultivation on propionate. Dissolved oxygen as expressed as percentage of content measured at 100% air at 0.1 L/min at 30 ºC using 300 RPM and 0% air. Arrows indicate at which time new propionate was injected to an end concentration of 10 mM. Samples for biomass, HPLC and B₁₂ quantification were taken directly prior to each new propionate injection