Bacterial Decomposition of Lignin Compounds in Cedar Bark

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  • 微生物による杉樹皮リグニンの分解
  • ビセイブツ ニ ヨル スギ ジュヒ リグニン ノ ブンカイ

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Abstract

Lignin is one of the main structural support components of plants. It exists at about 30% in conifers. It is a biopolymer composed of complicated phenol, because it has guaiacyl propane mainly, phenyl propane and 4-hydroxy phenyl propane structures. For studying bacterial decomposition of cedar bark powders, we added excrements of silk worm, pig, cow or chicken, and the reagent of prompting human waste disposal, and extracts of earth worm, or Armdilidium (Oka dango-mushi in Japan) to specimen of cedar bark powders. To determine the effect of bacterial decomposition of lignin, A scanning electron microscope was used on specimens of cedar bark powder cultured with fungus, Cariolus versicolor et cetra, with excrements and with reagent. Then, the degree of decomposition of lignin by microbes was determined by the Klason method. In result, scanning electron micrographs revealed that a considerable amount of the surface of the cedar bark powders were greatly dissolved biologically by all the microbes mentioned above. Each single cell extracted from the mixed cells of excrements of silk worm or Armdilidium (Oka dango-mushi) was the most effective bacterial decomposer of lignin.

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