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. 2019 Mar 21;20(6):1424. doi: 10.3390/ijms20061424

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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2D and 3D SPT images. (a–c) The fluorescence microscopy characterization of HeLa cells co-cultured with polymer-modified UCNPs. (a) bright-field, (b) fluorescence and (c) merged microscopy images [90]. (d) The images from various angles (at 0°, 60° and 120°) for UCNP–phospholipid–PEG-TAT. (e) The 3D trajectories from various angles (at 0°, 60° and 120°) for UCNP–phospholipid–PEG-NH³⁺ [45]. Reproduced from [90] with permission from Royal Society of Chemistry and [45] by permission of the PCCP Owner Societies. Copyright 2018 Royal Society of Chemistry.