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Medium Detail Information

Medium No.
Medium for natronophilic methylotrophic methanogen
 Mineral base 1*700ml
 Mineral base 2**300ml
 Bacto Yeast Extract (Difco)0.02g
 Coenzyme M0.14g
 Vitamin solution***10ml
 Trace element solution****10ml
  Mix mineral base 1 with mineral base 2 in 7:3 propotion in tightly closed vessels under a N2 atmosphere. Separately autoclave concentrated MgSO4·7H2O, NH4Cl, Bacto Yeast Extract, coenzyme M and Na2S·9H2O under a N2 atmosphere in tightly closed vessels. Add the concentrated solutions, and filter-sterile vitamin solution, trace element solution and methanol. After re-exchanging with N2, add 1 drop of filter-sterile 10% dithionaite solution in 1 M NaHCO3 by syringe. Final pH of the complete medium should be 10.
  *Mineral base 1
   Distilled water1L
  Mix ingredients and autoclave under a N2 atmosphere. Because some precipitate appears on the bottom for 1 day after autoclaving, use only supernatant for making the medium. Final pH should be 10.
  **Mineral base 2
   Distilled water1L
  Mix ingredients, adjust pH to 9.5 with HCl and autoclave under a N2 atmosphere. Final pH should be 9.5.
  ***Vitamin solution
   Folic acid2mg
   Nicotinic acid5mg
   p-Aminobenzoic acid1mg
   Vitamin B120.01mg
   Distilled water1L
  ****Trace elements solution
   Nitrilotriacetic acid (NTA)12.8g
   Distilled water1L
  First dissolve nitrilotriacetic acid and adjust pH to 6.5 with NaOH, and then add minerals. Final pH 7.0.