Figure 9: Normalized specific lipid oxidation () for three types of NP. Circles are SiO_{2}, triangles are Al_{2}O_{3}, and squares are TiO_{2}. Open symbols are 100 mg/L. Solid symbols are 1000 mg/L. Line is fitted 4-parameter Gaussian equation (9) in SigmaPlot ver. 9.01. Experimental conditions: initial algae concentration = cell/mL, test duration = 4 days, and initial test volume = 200 mL.