Fig. 9
From: Nitrogen and phosphorus stress as a tool to induce lipid production in microalgae
Projection of the studied variables and observations onto the factorial plane PC 1 and PC 2 for strains of Chlorella vulgaris. Indicators (variables): light intensity (µmol photons m− 2 s− 1); cultivation time (days); lipid content (% DW); lipid productivity (mg L− 1 day− 1); total nitrogen (g L− 1); total phosphorus (g L− 1); N:P (unit). Observations: species or strain numbers: Chlorella vulgaris (5); Group A: Chlorella vulgaris CCAP 211 (9–11); Chlorella vulgaris CCAP 211/11B (14–18); Group B: Chlorella vulgaris (1, 2); Chlorella vulgaris UTEX 395 (12, 13); Group C: Chlorella vulgaris (3, 4); Chlorella vulgaris CCAP 211/11B (6); Chlorella vulgaris F&M-M49 (7); Chlorella vulgaris AG10032 (8)