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Dissolve ingredients of solution A, adjust pH to 8.0 with 1 N NaOH and boil medium for 1 min, then cool to room temperature under 100% N2 gas atmosphere. Dispense solution A under same gas atmosphere in anoxic culture vessels (e.g., Hungate-type tubes) and autoclave. Prior to inoculation complete the medium by adding appropriate amounts of solutions B, C and D prepared under 100% N2 gas and sterilized by filtration. Adjust pH of the completed medium to 8.0 with a sterile anoxic solution of 0.1 N HCl or 0.1 N NaOH, if necessary.
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