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. 2021 May 10;26(9):2797. doi: 10.3390/molecules26092797

Figure 2.

Figure 2

(A) pH-responsive result of the GO-cDNA/IFO nanosystem (above) and fluorescence intensities of the nanosystem at different pH values [30]; (B) structure of poly(acrylic acid)—orange quantum dots (OQD) and poly(2-vinylpyridine) —blue quantum dots (BQD) and schematic representation of the conformation and behavior of MQD-GO at a given pH value (above), and photographic images of MQD-GO in buffer solutions with the indicated pH values under irradiation at 365 nm [32]; (C) pH-dependent and temperature-dependent hydrodynamic diameters of PNIPAM-MAA microgels in aqueous solution [33]; (D) CLSM images of N-GOs and dopamine incubated in tumor cells for 24 h in acidic culture medium and neutral culture medium [34].