1
Adjust pH to 7.0 with H2SO4. Distribute 20 ml of medium into 120 ml serum bottles under a stream of a H2-CO2 (4:1, v/v) gas mixture and seal with butyl rubber stoppers. Autoclave and stand the bottles overnight. Add 15 ml filter-sterilized air and pressurize the gas phase to 200 kPa with a H2-CO2 (4:1, v/v) gas mixture.
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