Fig. 4From: Microalgal photoautotrophic growth induces pH decrease in the aquatic environment by acidic metabolites secretionOPLS-DA analysis and composition of DOM in the aquatic environment from EG compared to CV in the negative ion mode. A The OPLS-DA analysis; B the composition of DOM from CV aquatic environment; C the composition of DOM from EG aquatic environment; DOM, dissolved organic matter. As the test group, EG1, 3, 6 represents the total metabolite peaks from EG aquatic environment on the 1, 3, and 6Â days of cultivation; as the control group, CV1, 3, 6 represents the total metabolite peaks of CV aquatic environment on the 1, 3, and 6Â days of cultivation. EG: E. gracilis; CV: C. vulgarisBack to article page