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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Wood science and technology 2 (1968), S. 105-114 
    ISSN: 1432-5225
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Zusammenfassung Der Cellulase-Abbau von Mikrofibrillen aus Valonia ventricosa wurde untersucht. Die enzymatische Wirkung führt dazu, daß die Elementarfibrillen, welche die Mikrofibrillen bilden, eine Tendenz zur Ablösung zeigen und daß die Enden der Mikrofibrillen schräg oder spitz zulaufen. Die Endflächen bilden mit der Mikrofibrillenachse Winkel von 60 ... 66°, 33° oder 20 ... 25°. Es wird angenommen, daß diese Flächen mit den Ebenen 41 $$\bar 4$$ , 43 $$\bar 4$$ and 45 $$\bar 4$$ des Cellulosegitters übereinstimmen und daß entlang dieser Ebenen die Hydrolyse zunehmend schwieriger wird. Aufgrund dieser Überlegungen wird eine Hypothese entwickelt, welche zur Erklärung der von den Moderfäulepilzen erzeugten, erosiven Vertiefungen dient, die bereits in verschiedenen Arbeiten über Holzfasern und Tracheiden beschrieben wurden.
    Notes: Summary The degradation of microfibrils from Valonia ventricosa by cellulase has been studied. As a result of enzymatic attack the elementary fibrils making up the microfibrils tended to separate and the ends of the microfibrils became oblique or pointed. The terminal planes made angles of 60 ... 66°, 33°, or 20 ... 25° with the microfibril axis. These planes are assumed to correspond to the 41 $$\bar 4$$ , 43 $$\bar 4$$ and 45 $$\bar 4$$ planes of the cellulose lattice and it is suggested that they are planes along which it is progressively more difficult for hydrolysis to proceed. On the basis of these considerations a suggestion has been proposed to explain the form of erosion cavities formed by soft-rot fungi described by previous workers in wood fibres and tracheids.
    Type of Medium: Electronic Resource
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