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. 2014 Mar 10;9(3):e89854. doi: 10.1371/journal.pone.0089854

Figure 5. Characteristics of the engineered strain DA-3 in medium containing Cu2+, Fe2+, and Fe3+.

Figure 5

(A) Effects of metal ions on cell growth and ALS activity. (B) The ability of metal ions to transform α-acetolactate to diacetyl in the fermentation process. The present data were obtained after optimizing the titers of the metal ions added with respect to diacetyl production and cell growth.