Fig. 3From: Efficient molasses utilization for low-molecular-weight poly-γ-glutamic acid production using a novel Bacillus subtilis strainComparison of different carbon sources (a) and yeast extract (b) for the production of γ-PGA using B. subtilis 242. Error bars represent SD calculated from three independent determinations. **Indicate significant differences at p < 0.05Back to article page