Fig. 6
VB12 concentration of Sm320 mutants obtained with ARTP treatments. “W” indicates the wild-type strain of S. meliloti with a VB12 content of 108 mg/L in a 24-well deep plate at 30 °C for 7 d. The solid line indicates the original strain, and the dotted line indicates the position where the VB12 content increased 10% compared with the original strain. Error bars show the means of three independent fermentation cultures for each strain by HPLC analysis