Fig. 1
Analysis of cell morphology in batch culture. Cells were cultivated in PT-7 and PT-8 medium respectively, in batch culture over 12 days under fluorescent lamp irradiation with a light intensity of 20 μmol/m2/s. Cells were counted by hemocytometer and data were averaged from 3 independent experiments. Student’s t-test was applied to analyze the group difference, asterisks represent statistically significant differences between the groups (P < 0.05)