Growth curves and volumetric biomass yields of <i>C. protothecoides</i>, <i>C. vulgaris</i>, and <i>C. sorokiniana</i>.

<p>(<b>A</b>) Photoautotrophic (□) and heterotrophic (▪) cultures were followed over the course of four weeks or until the population reached stationary phase. Data points are representative of biological replicates and error bars denote standard deviations greater than 1×10⁶ cells ml⁻¹. (<b>B</b>) <i>C. protothecoides</i>, <i>C. vulgaris</i>, and <i>C. sorokiniana</i> final biomass concentrations in 1.5-L culture during auto– (white) and heterotrophy (gray) are compared. Error bars designate standard deviation from the average of three technical replicates.