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Resistência biológica da madeira tratada de Eucalyptus grandis e Eucalyptus cloeziana a fungos apodrecedores em ensaios de laboratório Translated title: Biological resistance of Eucalyptus grandis and Eucalyptus cloeziana woods treated to the decay fungi under laboratory conditions

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      Abstract

      A presente pesquisa teve por objetivo avaliar a resistência biológica da madeira tratada de Eucalyptus grandis e Eucalyptus cloeziana sob a ação de organismos biodeterioradores em ensaios de laboratório. Para tanto, foram utilizadas árvores de Eucalyptus grandis e Eucalyptus cloeziana, ambas com 16 anos de idade, as quais foram desdobradas em tábuas e submetidas ao tratamento preservativo em autoclave com arseniato de cobre cromatado (CCA). Em seguida, confeccionaram-se os corpos de prova para condução do ensaio de apodrecimento acelerado com os fungos Trametes versicolor e Gloeophyllum trabeum, seguindo as recomendações da norma ASTM. A partir dos resultados obtidos, observou-se para o fungo Trametes versicolor que o tratamento preservativo foi eficiente na redução da degradação biológica da madeira das duas espécies, com redução da perda de massa em 35,17 e 82,31% para a madeira de Eucalyptus grandis e Eucalyptus cloeziana, respectivamente, já para o fungo Gloeophyllum trabeum, a perda de massa foi reduzida em 6,79 e 96,65%, em comparação à testemunha. Com base nas condições de realização do presente estudo observou-se que o tratamento preservativo com CCA é eficiente no aumento da resistência biológica da madeira a ação dos fungos apodrecedores Trametes versicolor e Gloeophyllum trabeum.

      Translated abstract

      The present study aimed to evaluate the biological resistance of treated wood from Eucalyptus grandis and Eucalyptus cloeziana under the action of biodeteriorative organisms in laboratory testing. Thus, we used trees of Eucalyptus grandis and Eucalyptus cloeziana, both 16 years old, which was converted into planks and subjected to preservative treatment in an autoclave with chromate copper arsenate (CCA). Then, it was made the specimens for the conduct of accelerated decay test, as recommended by ASTM. From the results, it was observed for the fungus Trametes versicolor that the preservative treatment was effective in reducing the biological degradation of the wood of the two species, with reduced mass loss in 35.17 and 82.31% for wood Eucalyptus grandis and Eucalyptus cloeziana, respectively, as for the fungus Gloeophyllum trabeum mass loss was reduced by 6.79 and 96.65%, compared to the control. Based on the conditions of realization of the present study, it was observed that preservative treatment with CCA is effective in the increasing the biological resistance of the wood under the action of fungi Trametes versicolor and Gloeophyllum trabeum.

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      Most cited references 19

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      Biodegradation of lignocellulosics: microbial, chemical, and enzymatic aspects of the fungal attack of lignin.

      Wood is the main renewable material on Earth and is largely used as building material and in paper-pulp manufacturing. This review describes the composition of lignocellulosic materials, the different processes by which fungi are able to alter wood, including decay patterns caused by white, brown, and soft-rot fungi, and fungal staining of wood. The chemical, enzymatic, and molecular aspects of the fungal attack of lignin, which represents the key step in wood decay, are also discussed. Modern analytical techniques to investigate fungal degradation and modification of the lignin polymer are reviewed, as are the different oxidative enzymes (oxidoreductases) involved in lignin degradation. These include laccases, high redox potential ligninolytic peroxidases (lignin peroxidase, manganese peroxidase, and versatile peroxidase), and oxidases. Special emphasis is given to the reactions catalyzed, their synergistic action on lignin, and the structural bases for their unique catalytic properties. Broadening our knowledge of lignocellulose biodegradation processes should contribute to better control of wood-decaying fungi, as well as to the development of new biocatalysts of industrial interest based on these organisms and their enzymes.
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        Caracterização da madeira de eucalipto para a construção civil

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          Biodeterioração e preservação da madeira

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            Author and article information

            Affiliations
            [1 ] Universidade Federal de Santa Catarina Brazil
            [2 ] Universidade Federal de Santa Maria Brazil
            [3 ] Universidade Federal de Rondônia Brazil
            [4 ] Instituto Brasileiro de Informação em Ciência e Tecnologia Brazil
            [5 ] Universidade Estadual de Roraima Brazil
            Contributors
            Role: ND
            Role: ND
            Role: ND
            Role: ND
            Role: ND
            Journal
            cflo
            Ciência Florestal
            Ciênc. Florest.
            Universidade Federal de Santa Maria (Santa Maria )
            1980-5098
            March 2015
            : 25
            : 1
            : 175-183
            S1980-50982015000100175
            10.1590/1980-509820152505175

            http://creativecommons.org/licenses/by/4.0/

            Product
            Product Information: SciELO Brazil
            Categories
            ECOLOGY
            ENVIRONMENTAL STUDIES
            FORESTRY

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