Microfibril Angles Inside and Outside Crossfields of Norway Spruce Tracheids
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H. C. Lichtenegger
Summary
The major part of the wood cell wall consists of parallel-aligned cellulose fibrils. Locally, pits connecting adjacent cell walls disturb the fibril arrangement. The local fibril orientation around these mechanically weak points is crucial for the mechanical stability of the cell. In some softwood species like spruce, the pit apertures at junctions of tracheids and cross-running ray parenchyma cells are elongated and slit-like. The pit orientation has often been assumed to directly reflect the fibril orientation. In this paper we use X-ray microdiffraction to determine the local microfibril angle (tilt angle versus the cell axis, MFA) in single tracheid walls of Norway spruce in the vicinity of pit apertures. The results from microdiffraction are compared with the pit orientation observed under the light microscope.Whereas a good correlation was found in thick-walled latewood cells from the stem and compression wood, large discrepancies occurred for thin-walled earlywood cells. A simple mechanical model that could explain the different situation in earlywood and latewood is presented.
Copyright © 2003 by Walter de Gruyter GmbH & Co. KG
Articles in the same Issue
- The Relationship Between Variability of Cell Wall Mass of Earlywood and Latewood Tracheids in Larch Tree-Rings, the Rate of Tree-Ring Growth and Climatic Changes
- How Variability in OSB Mechanical Properties Affects Biological Durability Testing
- Microfibril Angles Inside and Outside Crossfields of Norway Spruce Tracheids
- Reactivity of a Fungal Laccase Towards Lignin in Softwood Kraft Pulp
- Lignans and Lipophilic Extractives in Norway Spruce Knots and Stemwood
- Investigation of Lignin Oligomers Using Electrospray Ionisation Mass Spectrometry
- Reactions of Lignin with Peroxymonophosphoric Acid: The Degradation of Lignin Model Compounds
- The Reactions of Lignin Model Compounds with Hydrogen Peroxide at Low pH
- Spin Distribution in Dehydrogenated Coniferyl Alcohol and Associated Dilignol Radicals
- Ultrastructural Localisation of Glucomannan in Kraft Pulp Fibres
- New Method for Quantitative Preparation of Lignin- Carbohydrate Complex from Unbleached Softwood Kraft Pulp: Lignin-Polysaccharide Networks I
- Peroxide Bleaching of Parquet Blocks and Glue Lams
- Easily Degradable Chlorinated Compounds Derived from Glucuronoxylan in Filtrates from Chlorine Dioxide Bleaching of Eucalyptus globulus Kraft Pulp
- Non-Deterministic Description of Wood Radio Frequency Vacuum Drying
- Bending Creep of High-Temperature Dried Spruce Timber
- Optimization of a Violin Top with a Combined Laminate Theory and Honeycomb Model of Wood
- Optimisation of Soda Pulping Variables for Preparation of Dissolving Pulps from Oil Palm Fibre
Articles in the same Issue
- The Relationship Between Variability of Cell Wall Mass of Earlywood and Latewood Tracheids in Larch Tree-Rings, the Rate of Tree-Ring Growth and Climatic Changes
- How Variability in OSB Mechanical Properties Affects Biological Durability Testing
- Microfibril Angles Inside and Outside Crossfields of Norway Spruce Tracheids
- Reactivity of a Fungal Laccase Towards Lignin in Softwood Kraft Pulp
- Lignans and Lipophilic Extractives in Norway Spruce Knots and Stemwood
- Investigation of Lignin Oligomers Using Electrospray Ionisation Mass Spectrometry
- Reactions of Lignin with Peroxymonophosphoric Acid: The Degradation of Lignin Model Compounds
- The Reactions of Lignin Model Compounds with Hydrogen Peroxide at Low pH
- Spin Distribution in Dehydrogenated Coniferyl Alcohol and Associated Dilignol Radicals
- Ultrastructural Localisation of Glucomannan in Kraft Pulp Fibres
- New Method for Quantitative Preparation of Lignin- Carbohydrate Complex from Unbleached Softwood Kraft Pulp: Lignin-Polysaccharide Networks I
- Peroxide Bleaching of Parquet Blocks and Glue Lams
- Easily Degradable Chlorinated Compounds Derived from Glucuronoxylan in Filtrates from Chlorine Dioxide Bleaching of Eucalyptus globulus Kraft Pulp
- Non-Deterministic Description of Wood Radio Frequency Vacuum Drying
- Bending Creep of High-Temperature Dried Spruce Timber
- Optimization of a Violin Top with a Combined Laminate Theory and Honeycomb Model of Wood
- Optimisation of Soda Pulping Variables for Preparation of Dissolving Pulps from Oil Palm Fibre
