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The acidification of synaptosomes in the presence of NaYF4:Eu3+-PEG. The synaptosomes were loaded with acridine orange (5 μM); when the steady level of the dye fluorescence had been reached, NaYF4:Eu3+-PEG at a concentration of 0.5 mg/ml (arrow no. 1) and at a concentration of 7.5 mg/ml (arrow no. 2) were applied to the synaptosomes. Trace represents three experiments performed with different preparations
