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Ultrastructure in Relation to the Mechanical Optimization of Trees

Research Project

Project/Area Number 17580142
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 林産科学・木質工学
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

SUGIYAMA Junji  KYOTO UNIVERSITY, Research Institute for Sustainable Humanosphere, Professor, 生存圏研究所, 教授 (40183842)

Project Period (FY) 2005 – 2006
Project Status Completed (Fiscal Year 2006)
Budget Amount *help
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 2006: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 2005: ¥2,300,000 (Direct Cost: ¥2,300,000)
Keywordsbiomechanics / cel lulose / growth stress / lattice strain / 引張応力 / あて材 / セルロース結晶 / 放射光 / 結晶ひずみ
Research Abstract

In order to understand the mechanical state and function of cellulose microfibrils/crystallites in the tension wood, we have performed a crystallographic approach to compare the strains at molecular level to the macroscopic level. We have demonstrated experimentally for the first time that the fiber repeat distance of cellulose microfibrils/crystallites is larger in tension wood in situ than after the release of the maturation stress. Therefore, the contraction of the cellulose microfibrils/crystallites during the release of maturation stress was confirmed and it was as much as the macroscopic strain was. However, it is still open whether cellulose microfibrils/crystallites in tension wood are generating the maturation stress. The alternative assumption is that they have a larger equilibrium fiber repeat distance, due to a larger crystal size.
So far, though many studies were carried out to observe the width of cellulose microfibrils/crystallites in tension wood, values range between 2 and 7 nm depending on the technique and sample preparation. Therefore, it is prerequisite to increase the precision of the measurement. In addition, data on the size together with (004) spacing of wood cellulose which are crystallized under different physical or physiological condition would shed a light on a better understanding of cellulose structure and its mechanical state in wood

Report

(3 results)
  • 2006 Annual Research Report   Final Research Report Summary
  • 2005 Annual Research Report
  • Research Products

    (4 results)

All 2006

All Journal Article (4 results)

  • [Journal Article] Mechanical Behavior of Cellulose Microfibrils in Tension Wood, in Relation with Maturation Stress Generation2006

    • Author(s)
      Bruno Clair ら
    • Journal Title

      Biophysical Journal 91

      Pages: 1128-1135

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Annual Research Report 2006 Final Research Report Summary
  • [Journal Article] Direct investigation of the structural properties of tension wood cellulose microfibrils using microbeam X-ray fibre diffraction2006

    • Author(s)
      Martin Muller ら
    • Journal Title

      Holzforschung 60

      Pages: 474-479

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Annual Research Report 2006 Final Research Report Summary
  • [Journal Article] Mechanical Behavior of Cellulose Microfibrils in Tension Wood, in Relation with Maturation Stress Generation2006

    • Author(s)
      Bruno Clair et al.
    • Journal Title

      Biophysical Journal 91

      Pages: 1128-1135

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Direct investigation of the structural properties of tension wood cellulose microfibrils using microbeam X-ray fibre diffraction2006

    • Author(s)
      Martin MOller et al.
    • Journal Title

      Holzforschung 60

      Pages: 474-479

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary

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Published: 2005-04-01   Modified: 2016-04-21  

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