3.2. Effect of light intensity on cell growth and C-PC production
For phototrophic cultivation, the light intensity not only
strongly influences the cell growth of microalgae, but also changes
the levels of light-related molecules in photosynthetic system
(Markou et al., 2012; Xie et al., 2013). To investigate the effect of
light intensity on cell growth and C-PC production of A. platensis,
different light intensities (75–450 lmol/m2
/s) were examined in
this study. As shown in Fig. 2a, both the biomass productivity
and specific growth rate of A. platensis increased significantly when
the light intensity was increased from 75 to 300 lmol/m2
/s.
However, a sharp decrease was observed when light intensity
was further increased up to 450 lmol/m2
/s, indicating that this
light intensity falls within the light inhibition region (Xue et al.,
2011). This could be directly supported by the observation of
changing cells color from green to white during cultivation in
the first 3 days (data not shown). Thus, 300 lmol/m2
/s seems to
be the optimal light intensity for the growth of A. platensis, with
the highest biomass productivity of 436.3 ± 6.2 mg/L/d and specific
growth rate of 1.02 ± 0.04 d1
3.2. Effect of light intensity on cell growth and C-PC productionFor phototrophic cultivation, the light intensity not onlystrongly influences the cell growth of microalgae, but also changesthe levels of light-related molecules in photosynthetic system(Markou et al., 2012; Xie et al., 2013). To investigate the effect oflight intensity on cell growth and C-PC production of A. platensis,different light intensities (75–450 lmol/m2/s) were examined inthis study. As shown in Fig. 2a, both the biomass productivityand specific growth rate of A. platensis increased significantly whenthe light intensity was increased from 75 to 300 lmol/m2/s.However, a sharp decrease was observed when light intensitywas further increased up to 450 lmol/m2/s, indicating that thislight intensity falls within the light inhibition region (Xue et al.,2011). This could be directly supported by the observation ofchanging cells color from green to white during cultivation inthe first 3 days (data not shown). Thus, 300 lmol/m2/s seems tobe the optimal light intensity for the growth of A. platensis, withthe highest biomass productivity of 436.3 ± 6.2 mg/L/d and specificgrowth rate of 1.02 ± 0.04 d1
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