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. 2020 Jan 19;12(1):237. doi: 10.3390/polym12010237

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© 2020 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 (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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SEM photographs of wood samples after 12 weeks decay stage. Cross-section: (a), control sample, (b), sample treated with P₁, (c), sample treated with P₂, (d), sample treated with P_3; Radial-section: (e), control sample, (f), sample treated with P₁, (g), sample treated with P₂, (h), sample treated with P₃.