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Mix ingredients except NaHCO3, Trace vitamins and Na2S x 9H2O, and autoclave under a N2-CO2 (90:10) atmosphere. Filter-sterilize NaHCO3 as an 8.4% solution and Trace vitamins while gassing with N2. Separately autoclave Na2S x 9H2O as 5% solution under a N2 atmosphere. Aseptically and anaerobically add NaHCO3 and Trace vitamins to the medium under a N2-CO2 (90:10) atmosphere. Prior to inoculation, add the sterile Na2S x 9H2O solution, and adjust pH to 7.5 - 8.0.
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