Fig. 1From: Influence of light absorption rate on the astaxanthin production by the microalga Haematococcus pluvialis during nitrogen starvationChlorophyll content Wchl (a) and biomass concentration Cx (b) of H. pluvialis during sudden nitrogen starvation of batch cultures exposed to PFD of 250 µmolhν m−2 s−1 with initial biomass concentrations \({\mathrm{C}}_{{\mathrm{x}}_{0}}\) equals to 0.21, 0.52, 1.39 and 2.21 kg m−3 as a function of cultivation time t. Data shown as mean ± SD, n = 3Back to article page