2
Prepare and boil the medium in the absence of Na2S x 9 H2O, NaHCO3, Vitamin B12, CaCl2 x 2 H2O, MgCl2 x 6 H2O. Cool under a stream of nitrogen and add the remaining components, except vitamin B12 and Na2S2O3 x 5 H2O. Dispense into tubes or bottle fitted with rubber stoppers and autoclave. Add the vitamin B12 (filter sterilised) and Na2S2O3 x 5 H2O from sterile stock solutions.
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