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The indicator medium contained 0.67%  (w/v) Difco Bacto  Yeast  Nitrogen  Base  without  amino  acids;  15.0% (w/v) glucose;  1.0%  (w/v) L-malic acid  and  0.0022%  (w/v) bromocresol  green.  These  components  were  combined  in
2 x solution.  The  pH  was  adjusted  to  3.8  with  KOH.  This solution  and  an  equal  volume  of a  4%  agar  solution  were  autoclaved  separately  at  121~  for  15 rain.  The  two  solutions were mixed before plates were poured.
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