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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/).
SEM images of a fresh olive leaf (A,B) and the artificial olive leaf (C,D). (E) Elemental mapping (SEM-EDX) of AOL sample indicating the distribution of Ti, O, Ca, K, Si and P.