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Percentages of 13C-labeled methyl and carbonyl groups in total-culture acetate, calculated from proton and carbon NMR spectra.
| Time (h) | % 13C | |
| Methyl (CH3) | 0 | 1.0 |
| 4 | 1.6 | |
| 8 | 2.0 | |
| Carbonyl (CO) | 8 | 21.8 |
Samples were taken from the “Ca. G. soehngenii” chemostat enrichment cultures in bioreactor 2 after switching the alkali supply line from 1 M NaOH to 1 M NaH13CO3 (Time = 0 h).
