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Effects of three sizes of TiO2 on photosynthetic parameters in S. obliquus after 72 h exposure. (A) Oxygen evolution/consumption under growth light and dark conditions, respectively; (B) PSII quantum yield; (C) Maximal and minimal fluorescence yields (FM and F0); and (D) non-photochemical quenching (NPQ). Different letters on the error bars represent significant (Tukey’s HSD, p < 0.05) differences. Values are represented as means ± SD (n = 3).
