Results 11 to 20 of about 53,723 (242)
Wood Material Science and EngineeringWood branches subjected to bending develop reaction wood to accommodate both tensile and compressive stresses. For softwood, such as Norway spruce and Scots pine, compression wood (CW) develops in the lower parts, while opposite wood (OW) develops on the upper parts of the branch. It is likely that the ratio of CW to OW is optimised for mechanical load
Kristofer Gamstedt, Malin Wöhlert
exaly +3 more sources
Industrial Crops and ProductsPoplar is a high-biomass species and is widely used for the phytoremediation of soils contaminated with cadmium. It is often subjected to heterogeneous soil conditions and associated stresses that promote reaction wood formation during growth.
Zekai Sun +5 more
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Structural differences between reaction wood and opposite wood with different drying temperatures [PDF]
BioResources, 2020 Reaction wood is characterized by having different anatomical and chemical features than normal wood. The different composition of cell walls, the higher quantitative proportion of thick-wall fiber cells, diameter, and the abundance of vessels have remarkable effects on reaction wood’s physical and mechanical properties.
Ivan Klement +3 more
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Compression stress in opposite wood of angiosperms: observations in chestnut, mani and poplar [PDF]
Annals of Forest Science, 2006 In order to face environmental constraints, trees are able to re-orient their axes by controlling the stress level in the newly formed wood layers. Angiosperms and gymnosperms evolved into two distinct mechanisms: the former produce a wood with large tension pre-stress on the upper side of the tilted axis, while the latter produce a wood with large ...
Clair, Bruno +2 more
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STUDYING SOME ANATOMICAL AND MECHANICAL CHARACTERISTICS OF COMPRESSION WOOD FOR Pinus brutia Ten. LEANING TREES [PDF]
Mesopotamia Journal of Agriculture, 2009 This study was conducted to show the effect of compression wood on some anatomical characteristics and mechanical characteristics of brutia pine Pinus brutia Ten. trees growing naturally at Dohuk provenance and to compare it with the standing trees (tree
Abdulrazak R. S. Almalah
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Initial Desorption of Reaction Beech Wood
Drvna Industrija, 2022 The research aimed to obtain empirical data for modeling the initial desorption in reaction wood from the cross-section of the green beech (Fagus sylvatica L.) log. Firstly, we analyzed the chemical composition, macro and microscopic structure of tension
Jerzy Majka +3 more
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BioResources, 2018 Quantitative aspects were investigated and compared for anatomical characteristics among compression wood (CW), lateral wood (LW), and opposite wood (OW) in the stem wood of Ginkgo biloba. Characteristics of each part were observed in the 5th, 10th, and 15th to 20th growth rings via optical and scanning electron microscopy.
Byantara Darsan Purusatama, Nam Hun Kim
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Comparative Analysis of G-Layers in Bast Fiber and Xylem Cell Walls in Flax Using Raman Spectroscopy
Biomolecules, 2023 In a response to gravitropic stress, G-layers (gelatinous layers) were deposited in xylem cell walls of tilted flax plants. G-layers were produced in both tension wood (upper side) as expected but were also observed in opposite wood (lower side).
Anne-Sophie Blervacq +3 more
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Tension Wood and Opposite Wood in 21 Tropical Rain Forest Species [PDF]
IAWA Journal, 2006 Wood samples were taken from the upper and lower sides of 21 naturally tilted trees from 18 families of angiosperms in the tropical rain forest in French Guyana. The measurement of growth stresses ensured that the two samples were taken from wood tissues in a different mechanical state: highly tensile stressed wood on the upper side, called tension ...
Julien Ruelle +4 more
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Journal of Forest Science, 2007 Wood is a hygroscopic material that is affected by shape changes. The aim of this study was to analyse the variability of wood swelling in the individual anatomic directions. Wood swelling was examined on a sample tree containing compression wood.
V. Gryc, H. Vavrčík, P. Horáček
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