Table 2.
Average PLFA total concentrations, mol%, and δ13C values from 13C-labeled and non-labeled CO utilization experiments from triplicate experiments except where noted.
| Live | Killed | Welch T-test ** | |||||
|---|---|---|---|---|---|---|---|
| Natural abundance CO* | 13C labeled CO | Natural abundance CO | |||||
| Mean | SD | Mean | SD | Mean | SD | (p-value) | |
| Sum of PLFA (nmol bottle−1) | 15.3 | 2.8 | 20.8 | 5.0 | 12.3 | 3.8 | 0.096 |
| PLFA COMPOSITION (mol%) | |||||||
| 16:0 | 10.7% | 3.1% | 15.0% | 2.0% | 16.3% | 2.7% | 0.211 |
| 16:1ω7 | 6.9% | 2.3% | 13.7% | 3.2% | 9.2% | 3.6% | 0.575 |
| cy17:0 | 7.1% | 0.6% | 7.8% | 1.4% | 7.8% | 0.5% | 0.647 |
| 18:0 | 11.9% | 2.6% | 10.3% | 1.9% | 10.9% | 0.8% | 0.953 |
| 18:1ω9 | 9.2% | 0.7% | 8.3% | 1.2% | 12.1% | 1.8% | 0.062 |
| 18:1ω7 | 34.1% | 0.3% | 30.0% | 2.2% | 26.2% | 3.2% | 0.079 |
| cy19:0 | 9.7% | 0.5% | 7.9% | 1.1% | 10.4% | 1.5% | 0.161 |
| 20:0 | 5.4% | 1.3% | 3.7% | 0.7% | 3.6% | 0.3% | 0.235 |
| 22:0 | 5.1% | 1.5% | 3.3% | 0.8% | 3.5% | 0.4% | 0.412 |
| PLFA δ13C | |||||||
| 16:0 | −28.3‰ | 0.1‰ | −25.2‰ | 2.7‰ | −27.8‰ | 1.3‰ | |
| 16:1ω 7 | −36.0‰ | 2.7‰ | −22.4‰ | 9.4‰ | −29.2‰ | 7.6‰ | |
| cy17:0 | −26.7‰ | 0.6‰ | −25.3‰ | 1.1‰ | −24.6‰ | 1.1‰ | |
| 18:1ω 9 | −25.8‰ | 0.8‰ | −25.0‰ | 0.5‰ | −25.8‰ | 0.4‰ | |
| 18:1ω 7 | −24.2‰ | 0.1‰ | −24.8‰ | 0.9‰ | −25.2‰ | 0.4‰ | |
| cy19:0 | −27.0‰ | 0.2‰ | −26.9‰ | 1.0‰ | −27.2‰ | 0.6‰ | |
*
The average of two live non 13C-labeled treatments, L2 = 13.3 nmole and L3 = 17.3 nmole. The L1 bottle broke during freezing.
**
Welch T-tests compared live (n = 5) vs. killed (n = 3) experiments.
Bold p-values are values less than 0.1.