Fig. 5From: Microalgal photoautotrophic growth induces pH decrease in the aquatic environment by acidic metabolites secretionHeat map of differential metabolites. A The heat map of E. gracilis (EG) differential metabolites between intracellular (IEG) and extracellular (EE); B the heat map of differential metabolites from the aquatic environment between C. vulgaris (CV) and EG; all metabolites were detected in negative ion mode (NEG mode); BKs, represent candidate biomarkersBack to article page