Figure 8: The plot of daily chlorophyll content against culture time for different pH levels. According to the diagram, from day 2 to day 5, the increase in chlorophyll was obviously quicker than the increase between day 5 and day 10. Therefore, for each culture condition, two specific growth rates were calculated on day 2 - day 5 and day 5 - day 10, separately. The method for estimating the specific growth rate is shown in Appendix 2.