Fig. 2

Growth status of 20 h anaerobic fermentation in serum bottles of the IAM1183 and its mutant strain {a Growth curve [in terms of cell dry weight (g/L)] of IAM1183, IAM1183-G, IAM1183-EF, IAM1183-EFG, IAM1183-P, IAM1183-GP, IAM1183-EFP and IAM1183-EFGP; b growth curve [in terms of cell dry weight (g/L)] of IAM1183/M, IAM1183-G/M, IAM1183-EF/M, IAM1183-EFG/M, IAM1183-P/M, IAM1183-GP/M, IAM1183-EFP/M and IAM1183-EFGP/M; c pH changes of IAM1183, IAM1183-G, IAM1183-EF, IAM1183-EFG, IAM1183-P, IAM1183-GP, IAM1183-EFP and IAM1183-EFGP; d pH changes of IAM1183/M, IAM1183-G/M, IAM1183-EF/M, IAM1183-EFG/M, IAM1183-P/M, IAM1183-GP/M, IAM1183-EFP/M and IAM1183-EFGP/M}