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. 2014 Jul 22;14(7):13186–13209. doi: 10.3390/s140713186

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© 2014 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 license (http://creativecommons.org/licenses/by/3.0/).

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Figure 1. — Schematic illustration of the SiO₂NPs-based optical urea biosensor.