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Mix ingredients except NaHCO3, L-cysteine x HCl x H2O and Na2S x 9H2O and adjust pH to 7.2. Distribute the medium into tubes (e.g., 5 ml of the medium in the Hungate tubes) under a N2 x CO2 gas mixture (4:1, v/v), seal with butyl rubber stoppers and autoclave. After cooling, add solutions of NaHCO3 [5%, filter-sterilized and stored under a N2-CO2 (4:1, v/v) gas mixture], L-cysteine x HCl x H2O and Na2S x 9H2O (5%, autoclaved and stored under N2) to the medium.
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