Strain modifications for Medium 358a
3 distinct modifications were found.
Reduce amount of yeast extract to 0.02 g/l.
Reduce amount of yeast extract to 0.20 g/l and adjust pH to 2.5 - 3.0. Pressurize inoculated bottles to 2 bar overpressure with sterile 80% H2 and 20% CO2 gas mixture.