Fig 1. Growth of photoautotrophic cultures of E. gracilis at 23 (circle) or 30 °C (upward and downward triangles) with two (square) or three (circle and triangles) light sources of 400 μE m^-2 s^-1 intensity (2 x 400 or 3 x 400 μE m^-2 s^-1).

(a), Growth curves measured by cell dry weight. Error bars (which were generally smaller than the symbol) represent the standard error of the mean (n = 2–6). (b), Natural logarithms (ln) of cell density measured by OD₇₈₀, and the least square regression lines.