Microbial and Enzymatic Degradation of Wood and Wood - download pdf or read online

By Karl-Erik L. Eriksson, Robert A. Blanchette, Paul Ander

ISBN-10: 3642466877

ISBN-13: 9783642466878

ISBN-10: 3642466893

ISBN-13: 9783642466892

The oil trouble throughout the Nineteen Seventies grew to become curiosity in the direction of the usage of renewable assets and in the direction of lignocellulosics specifically. The Nineteen Seventies have been additionally the cradle interval of biotechnology, and the years while biotechnical usage of lignocellulosic waste from agriculture and forestry received priori­ ty. This was once a logical end due to the fact that one in every of nature's most crucial biologi­ cal reactions is the conversion of wooden and different lignocellulosic fabrics to carbon dioxide, water and humic elements. notwithstanding, whereas biotechnology in different parts like drugs and pharmacology involved creation of expen­ sive items on a small scale, biotechnical usage and conversion of ligno­ cellulosics intended construction of cheap items on a wide scale. Biotechnical usage of lignocellulosic fabrics is hence a really tough job, and the industrial usage of this expertise has now not improved as speedily as one may have wanted. One cause of this used to be the inability of simple wisdom of enzyme mechanisms keen on the degradation and conversion of wooden, different lignocellulosics and their person parts. There also are dangers linked to starting up a technical improvement ahead of a strong platform of data is offered. a number of of the tasks all started with en­ thusiasm have for that reason suffered a few lack of curiosity. additionally contributing to this failing curiosity is the truth that the oil trouble on the time was once now not a true one. at this time, not anyone predicts a speedy exhaustion of the oil assets and gas construction from lignocellulosics isn't any longer a excessive priority.

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Cell walls do not have erosion troughs or cavities. C Even after severe degradation, over 50% weight loss, the cell walls are intact, and bordered pit membranes are evident. Hyphae are not prevalent. D Advanced stages of brown rot, showing mycelia filling the latewood and earlywood tracheids and resin duct. Masses of mycelia are often observed during the late stages of degradation. The cell wall structure remains intact. A, D Transverse surface; SEM. B, C Radial surface; SEM. -lm .. Fig. 32. Changes in cell birefringence after brown-rot degradation by Poria placenta.

A-F Transverse sections; TEM (Blanchette and Reid 1986) To precisely map the distribution of lignin in sound and white-rotted wood, the methods described by Saka and Thomas (1982a, b), coupling bromine with lignin, have been used (Blanchette et al. 1987). X-ray microanalysis of brominated wood shows that lignin is distributed throughout the entire cell wall of sound birch, but the highest concentrations are found in the middle lamella (Fig. 26A, B). The distribution observed was consistent with other investigations using brominated wood and X-ray microanalysis (Hardell et al.

36_ Advanced brown-rot degradation in Pinus sp. The loss of wood strength by brown-rot attack is evident when slight pressure is applied to the wood and the remaining lignin skeleton crumbles into minute fragments. Radial surface; SEM. Bar = 100 ~m resulted in a loose framework of lignin. The morphology of the degraded cell wall was similar to the lignin skeletons of tracheids observed by Cote et al. (1966, 1968) and by Parham and Cote (1971) when wood was treated with hydrofluoric acid. The dense deposits of unhydrolyzed lignin of acid-treated wood in previous studies and in brown-rotted wood presented here (Fig.

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Microbial and Enzymatic Degradation of Wood and Wood Components by Karl-Erik L. Eriksson, Robert A. Blanchette, Paul Ander

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