Figure 1.

Effect of medium components on cell growth and reduction activity of Acetobacter sp. CCTCC M209061. (a) Effect of carbon sources; (b) Effect of nitrogen sources; (c) Effect of mineral elements. All experimental data are given as the mean ± SD of triplicate determinations. Control refers to the medium with no added carbon source (a), nitrogen source (b), or mineral element (c) added. The substantial growth observed in the no carbon source control in panel (a) results from the presence of glucose in the seed medium and nitrogen sources (yeast extract and peptone), which can provide a certain amount of carbon. The mixed nitrogen sources investigated in panel (b) contained equal masses of each of two nitrogen sources stated.