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. 2017 Dec 22;8:2606. doi: 10.3389/fmicb.2017.02606

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Copyright © 2017 Siroli, Patrignani, Serrazanetti, Chiavari, Benevelli, Grazia and Lanciotti.

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) or licensor 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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(A, B) SEM microphotographs of cardboard (A) and plastic (B). In A the presence of pores is evident, while in B a smooth, plane, and homogeneous surface with the presence of a clear scratch is evident.