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. 2022 Sep 7;13:955032. doi: 10.3389/fmicb.2022.955032

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Copyright © 2022 Kramer, Jankowiak, Nanjappa, Harke and Gobler.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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N₂ fixation rates normalized to cell density (pmol N₂-fixed cell^–1 day^–1). (A) N₂ fixation rates on days 1, 3, 5, and 9 averaged. (B) Final timepoint (day 9) N₂ fixation rates. Letters above bars represent significant differences between experimental groups (Two-way ANOVA; Tukey’s HSD post hoc; p < 0.05). (C) N₂ fixation as a function of maximum growth rate (μ_max; day^–1). Values in the upper right-hand corner represent the coefficient of determination (R²) and the significance (p-value) of the linear regression.