| CO2 fraction |
% |
0.03 |
3.32 ± 0.12 |
8.86 ± 0.24 |
13.84 ± 0.27 |
| CO2 conc. |
mmol/L |
0.001 ± 0.0006 |
1.16± 0.07 |
3.05 ± 0.09 |
4.81 ± 0.12 |
| Pra |
ug/L/h |
1521.9 |
2164.2 |
2279.1 |
750.0 |
| SPRb |
ug/g(DCW)/h |
45.2 ± 0.9 |
64.4 ± 2.1 |
69.4 ± 1.2 |
23.7 ± 1.6 |
| SGCRc |
mmol/g(DCW)/h |
0.18 |
0.17 |
0.14 |
0.10 |
| ?Yp/s |
ug/mmol |
252.9 |
382.4 |
480.5 |
248.3 |
| SCERd |
mmol/g(DCW)/h |
1.03 |
0.90 |
0.73 |
0.54 |
| CO2/Glucose |
C(mol)/C(mol) % |
94.6 ± 2.1 |
89.2 ± 1.9 |
85.6 ± 1.5 |
93.3 ± 1.3 |
|
| a, Pr: Vitamin B12 production rate |
| b, SPR: specific vitamin B12 production rate |
| c, SGCR: specific glucose consumption rate |
| d, SCER: specific carbon dioxide evolution rate |
| Table 2: Yield factors of vitamin B12 fermentation under various influent CO2 concentration for 48h with the cultivations of stationary phase biomass transfered from a well cultured 50L fermentor. |
