Figure 6: Critical specific lipid peroxidation (ε) as a function of primary particle size in terms of EC20 and EC50. Line is fitted 3-parameter Gaussian equation (8) in SigmaPlot ver. 9.01 for EC20 (dotted) and EC50 (solid). Experimental conditions: initial algae concentration = cell/mL, test duration = 4 days, and initial test volume = 200 mL.