Fig. 1.

How to obtain exactly two daughter cells during the Chlamydomonas cell division cycle. (A) Schematic illustration of the flat-panel photobioreactor design. (B–F) Experimental parameters measured under our growth conditions. Real-time profiles of the growth medium temperature (B), pH (C), and optical density at 680 nm (D). (E) Distribution of cell size over the diurnal cycle, shown as a box plot. (F) Number of cells in the culture as a function of diurnal time. Data (except E) are shown as average ± SD (n = 3–9, specified in each panel). The green triangles indicate the timing of cell division.