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. 2010 Mar 25;666(1):1–22. doi: 10.1016/j.aca.2010.03.038

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Fig. 3 — Steps for the synthesis of streptavidin immobilized up-conversion phosphor magnetic nanoparticles. TEOS: tetraethoxy-orthosilane; APTEOS: amino-propyl-triethoxysilane; EDTA: ethylenediaminetetraacetic acid. Adapted from Ref. [66].