The white rot fungus, Ceriporiopsis subvermispora, is able to degrade lignin in wood without intensive damage to cellulose. Since lignin biodegradation by white rot fungi proceeds by radical reactions, accompanied by the production of a large amount of Fe3+-reductant phenols and reductive radical species in the presence of iron ions, molecular oxygen, and H2O2, C. subvermispora has been proposed to possess a biological system which suppresses the production of a cellulolytic active oxygen species, *OH, by the Fenton reaction. In the present paper, we demonstrate that 1-nonadecene-2,3-dicarboxylic acid (ceriporic acid B), an extracellular metabolite of C. subvermispora, strongly inhibited *OH production and the depolymerization of cellulose by the Fenton reaction in the presence of iron ions, cellulose, H2O2, and a reductant for Fe3+, hydroquinone (HQ), at the physiological pH of the fungus.
Abstract. The objective of this study was to evaluate the properties of bamboo strandboard (OSB) by comparing different board types and strand-lengths. Bamboo strandboards with nominal dimensions of 37 mm by 37 mm by 12 mm and target density 0.65 g/cm 3 were manufactured using moso bamboo (Pyllostachys pubescent Mezel) and MDI resin to produce two types of strandlength. Two types of strand length and MDI resin were used to produce three types of strandboard. The bending properties and dimensional stability of the strandboards were evaluated according to the Japanese Industrial Standard (JIS) for particleboard. The results of this experiment indicate that the bending properties and internal bond strength were affected by both board type and strand-length. The distribution of resin inside the 80 mm strandboard was less homogenous than in the 50 mm strandboard, which affects the internal bond strength. Thickness swelling of the RAND board was the highest and linear stability was affected substantially by strand alignment. The RAND board and cross-oriented 3LAY board effectively restrained linear expansion in the direction perpendicular to the strand alignment. A cross-oriented core may be the most effective way to reduce dimensional change and bending property values in perpendicular directions.
Knowledge of the types of fungi inhabiting wood, their growth conditions, and level of damage is needed to design an effective and efficient preservation process. Researchers have tried to identify fungi that play a role in attacking wood products (impregnated wood), including the type and the role of these fungi in changing the quality of processed wood. Isolation was completed on fungal-attacked wood. The first isolation resulted in approximately 26 isolates, which were then grouped into 8 groups based on the macroscopic appearance of the fungus. Molecular identification of the fungi produced types of Aspergillus tamarii, Penicillium citrinum, Trichoderma longibrachiatum, Trichoderma reesei, and Fusarium solani. Chemical analysis using the Chasson Datta method was performed on attacked and non-attacked wood. A decrease was found in cellulose content and an increase in lignin content for impregnated wood attacked by fungi. It was suspected that there were cellulose-attacking fungi that consumed cellulose, which caused a decrease in cellulose content. An increasing lignin content was thought to be caused by phenols, produced by the delignification process by fungi and additional phenols from the impregnation process. Fourier transform infrared results revealed the presence of carbohydrates, showing that the degradation of cellulose by fungi produced simple carbohydrates.
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