Table 5.
Fractional abundance of 13C in IPL GDGT and the corresponding core GDGT in labeling experiments with 5% 13C-labeled bicarbonate during chemoautotrophic growth of “Ca. Nitrosoarchaeum koreensis” and “Ca. Nitrososphaera”
| Thaumarchaeote and GDGT type |
13C fractional abundance ofa: |
|
|---|---|---|
| IPL GDGT | Core GDGT | |
| “Ca. Nitrosoarchaeum koreensis” MY1 | ||
| Crenarchaeol, HPH | 0.051 | 0.053 |
| GDGT-0, HPH | 0.048 | 0.051 |
| “Ca. Nitrososphaera” strain JG1 | ||
| Crenarchaeol, HPH | 0.054 | 0.054b |
| Crenarcheaol, PH | 0.054 | 0.054b |
| GDGT-4, DH | 0.056 | 0.055c |
a
Determined by fitting isotope clusters of [M+H]+ (core GDGTs) and of [M+NH4]+/[M+Na]+ adducts (IPLs) with theoretical calculations of isotope abundance.
b
Measured on the crenarchaeol regioisomer due to coelution of crenarcheaol with GDGT-4.
c
Measured on GDGT-4′ due to coelution of GDGT-4 with crenarchaeol.