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. 2022 May 5;11(5):623. doi: 10.3390/antibiotics11050623

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© 2022 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 (https://creativecommons.org/licenses/by/4.0/).

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Fluorescence images of live (green) and dead (red) cells stained with calcein AM and ethidium, respectively, after 24 h incubation of MRC-5 human fibroblasts with (a) control, (b) Fe₃O₄@STR, (c) Fe₃O₄@NEO, (d) PLGA-CS-Fe₃O₄@STR and (e) PLGA-CS-Fe₃O₄@NEO spheres (scale bar is 50 µm and it is the same for all images).