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. 2020 Jul 31;11:1705. doi: 10.3389/fmicb.2020.01705

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Copyright © 2020 Grande, Sisto, Puca, Carradori, Ronci, Aceto, Muraro, Mincione and Scotti.

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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Transmission electron microscopy of SUNCs. SUNCs were electrochemically synthesized in ultrapure water. Large non-spherical nanocluster before filtration. Magnification: 250,000× (a); ultra-nanoclusters after filtration. A drop of 1:5 diluted stock solution of SUNCs was allowed to evaporate onto 300 mesh formvar-coated nickel grids, and then TEM image was taken at 75 kV by a ZEISS 109 microscope. Scale bar: 50 nm. Magnification: 85,000× (b).