Fig. 6From: Comparative metabolic profiling of the lipid-producing green microalga Chlorella reveals that nitrogen and carbon metabolic pathways contribute to lipid metabolismThe relative enzyme activities in three Chlorella strains. The relative enzyme activities of glutamine synthetase (GS) (a), glutamate synthase/NADH-dependent (NADH-GSN) (b), glutamate synthase/Fd-dependent (Fd-GSN) (c), aspartate aminotransferase (AST) (d), alanine aminotransferase (ALT) (e), pyruvate kinase (PK) (f), and citrate synthase (CS) (g) were detected after 0, 1, 2, and 6 day of N starvation, and control (0 day of C1) value of each enzyme activity was set to 1 for easy comparison. The significance of the differences between the 0 day of each strain and other test values in 1, 2, and 6 day in the same strain in each panel was tested using a one-way ANOVA. *p < 0.05Back to article page