Figure 1

Average spectra of Thalassiosira weissflogii cells. The average spectra of a cell subject to a sudden change in CO2 availability and of a control cell are shown. “LtoH” refers to a change from low (390 ppm) to high (5000 ppm) CO2 concentration in the aqueous medium. “HtoL” refers to a high (5000 ppm) to low (390 ppm) CO2 concentration transition. The shadows of each curve indicate the variance of the averages.