In addition, the present study also found that the cell concentration (>0.40 g/L) of the Chlorella sp. Y8-1 from mixotrophic (using 1 g/L sucrose and 10% CO2 as carbon source) growth was higher than the sum of those from autotrophic (0.15 g/L) (using 10% CO2 as carbon source) and heterotrophic (using 1 g/L sucrose as carbon source) growth (0.17 g/L, data not shown). This indicated that the mixotrophic growth is not a simple combination of photoautotrophic and heterotrophic growth. Although it has been reported that