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. 2016 Nov 7;11(11):e0166217. doi: 10.1371/journal.pone.0166217

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© 2016 Osorio et al

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Fig 2 — a. Non-loaded NPs, zinc and calcium are absent in the EDX spectrum (Ep1). b. Calcium loaded NPs. Calcium is detected in the EDX spectrum analysis (Ep2) c. Zn loaded NPs. Zinc and calcium were detected in the EDX spectrum analysis (Ep3). Light circular objects inside of the NPs were artifacts that developed during electron beam transmission. Ni, Si and Ti in the EDX spectra were contaminant elements from the sample holder. Presented EDX spectra correspond to qualitative analysis and to determine the identification of the elements present and is not a normalized quantitative analysis.