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PGA production and cultivation of B. licheniformis ATCC 9945 (A) and B. subtilis 1551 (B) in artificial liquid manure. The strains were cultivated at 35°C for 96 h in 500-ml conical flasks equipped with three baffles containing 100 ml of artificial liquid manure. The concentration of each carbon source was 0.5% (wt/vol). Symbols: ●, sodium gluconate; ■, glucose; ▴, sucrose; ▾, beet molasses; ○, whey; □, no carbon source.
