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Fast Chl a fluorescence OJIP transients exhibited when L. gibba plants were exposed to 0, 1, 10, 100, and 1000 mg/L of NiO-Bulk or NiO-NPs suspensions (n = 5). The symbols used are O, J, I, and P representing, respectively, the fluorescence intensities at 50 μs, 2 ms, 30 ms, and 200 ms.
