Fig. 1

Effects of CO2 concentration on growth, medium pH, and photosynthetic performance of P. tricornutum. a Growth curve of P. tricornutum; b pH changes of all of the cultures; c The maximum quantum yield of PSII (F v/F m) in P. tricornutum; d The effective PSII quantum yield (YII) in P. tricornutum. Data are expressed as a mean ± SD (n = 3)