| Project/Area Number |
01560187
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
林産学
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| Research Institution | Tottori University |
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Principal Investigator |
FURUKAWA Ikuo Faculty of Agriculture, Associate Professor, 農学部, 助教授 (50032313)
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| Project Period (FY) |
1989 – 1990
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| Project Status |
Completed (Fiscal Year 1990)
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| Budget Amount *help |
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1990: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1989: ¥1,400,000 (Direct Cost: ¥1,400,000)
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| Keywords | Solid wood / Micro defect / Deterioration / Slip plane / Wood rot fungi / Chitosan / Morphology / Mechanical properties / 木材(ブナ) / 生物劣化 / COV(Coriolus versicolor) / SEL(Serpula lacrymans) / カビ類 / 腐朽形態 / 強度的性質 / 細胞壁 / 光学顕微鏡 / 形態計測 / 微小欠陥部 |
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| Research Abstract |
The purpose of this study is to clarify the morphological features of the slip planes and the incipient decay portion within the cell walls, and to evaluate the influence of their micro defects on mechanical properties of solid wood.
The slip planes within cell walls were closely related to mechanical deterioration of wood. The presence of slip planes drastically decreased strength and toughness of solid wood. At the low precompression level, the slip planes distributed randomly and thinly. The slip planes tend to concentrate at the compression failure zones, as the precompression stress level increased. Final breakage of the precompression wood occurred at the compression failure zone, and the cracks always propagated through the slip-plane site.
The cells walls were seriously decayed by the wood-rot fungi and bacteria. The chitosan-coated wood showed high resistance to decay by the fungi, and remarkable anti-fungal effect was recognized for COV and SEL. The chitosan-coated cell-wall showed no evidence of enzymatic degradation and adherence of fungus on the surface of the cell wall.
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