Analysis of the Eukaryotic Community and Metabolites Found in Clay Wall Material Used in the Construction of Traditional Japanese Buildings

  • KITAJIMA Sakihito
    Graduate School of Science and Technology, Kyoto Institute of Technology Future-Applied Conventional Technology Center, Kyoto Institute of Technology
  • KAMEI Kaeko
    Graduate School of Science and Technology, Kyoto Institute of Technology
  • NISHITANI Maiko
    Graduate School of Science and Technology, Kyoto Institute of Technology
  • SATO Hiroyuki
    Future-Applied Conventional Technology Center, Kyoto Institute of Technology Sato Plasterer Inc.

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Clay wall (tsuchikabe in Japanese) material for Japanese traditional buildings is manufactured by fermenting a mixture of clay, sand, and rice straw. The aim of this study was to understand the fermentation process in order to gain insight into the ways waste biomass can be used to produce useful materials. In this study, in addition to Clostridium, we suggested that the family Nectriaceae and the Scutellinia sp. of fungi were important in degrading cell wall materials of rice straw, such as cellulose and/or lignin. The microorganisms in the clay wall material produced sulfur-containing inorganic compounds that may sulfurate minerals in clay particles, and polysaccharides that give viscosity to clay wall material, thus increasing workability for plastering, and possibly giving water-resistance to the dried clay wall.

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