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. 2019 Jul 26;10:1632. doi: 10.3389/fmicb.2019.01632

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Copyright © 2019 Xu, Qiao, Ma, Yan, Guo, Dou, Zhang and Roman.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Preparation and characterization of biosynthesized SeNPs by L. lactis NZ9000. (A) Appearance color of M17B, L. lactis NZ9000 supernatant or L. lactis NZ9000 cultivated with or without Na₂SeO₃ at 30°C for 48 h; (B) Visible white color of L. lactis NZ9000. (C) TEM images of SeNPs-enriched L. lactis NZ9000. (D) The freeze-dried powder of SeNPs isolated from SeNPs-enriched L. lactis NZ9000 appears distinct bright red color. (E) SEM–EDX images of isolated SeNPs. (F) Extracted biogenic biomolecules capped-SeNPs contained C, N, O and Se elements by X-ray photoelectron spectroscopy (XPS) analysis. SeNPs, selenium nanoparticles.