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I thought the crabtree effect meant that all growth in regular gravity wort was due to fermentation, and O2 was just used for building ergosterol and other during the process. AKA there are no actual phases in fermentation unless you're propagating yeast at a very low gravity (< 1.010).
I thought the use of O2 indicates respiration as opposed to fermentation, with no ethanol production during that time, due to the different pathway.If I am wrong, I apologize.