Figure 4From: Lipid accumulation and biosynthesis genes response of the oleaginous Chlorella pyrenoidosaunder three nutrition stressorsHydroxide radical (OH) and malondialdehyde (MDA) content, and the peroxidase (POD) activity and superoxide dismutase (SOD) activity of Chlorella pyrenoidosa under different nutrient limitations. (a)â‹…OH, (b) MDA, (c) POD, (d) SOD. N, nitrogen; P, phosphorus; Fe, iron.Back to article page