Open AccessJournal Article
A variance approach to the X-ray diffractometric estimation of microfibril angle in wood
TLDR
In this paper, a new method was presented for estimating microfibril angle in wood by X-ray diffractometry, where the variance, S 2, of the azimuthal 002 (cellulose I) diffraction profile was shown to be related to micro-fibrils angle, μ, by a very simple approximate relationship: S 2 =μ 2 /2+σ 2, where σ is the standard deviation of micro-bibril orientation about μ.Abstract:
A new method is presented for estimating microfibril angle in wood by X-ray diffractometry. The variance, S 2 , of the azimuthal 002 (cellulose I) diffraction profile is shown to be related to microfibril angle, μ, by a very simple approximate relationship: S 2 =μ 2 /2+σ 2 , where σ is the standard deviation of microfibril orientation about μ. Advantages in interpretation flow from the principle of variance additivity, making possible the analysis of composite diffraction patterns accumulated over regions of wood with strongly varying microfibril orientation. Experimental advantages include insensitivity to fibre cross-section shape, the orientation of the fibre about its axis, and noise in the diffraction pattern.read more
Citations
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Cellulose microfibril angle in the cell wall of wood fibres
J. R. Barnett,Victoria A. Bonham +1 more
TL;DR: The variation of MFA within the tree and the biological reason for the large differences found between juvenile (or core) wood and mature (or outer) wood are considered.
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Microfibril Angle: Measurement, Variation and Relationships – A Review
TL;DR: MFA, in combination with basic density, shows a strong relationship to longitudinal modulus of elasticity, and to longitudinal shrinkage, which are the main reasons for interest in this cell wall property in conifers.
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Fasciclin-like arabinogalactan proteins: specialization for stem biomechanics and cell wall architecture in Arabidopsis and Eucalyptus
Colleen P. MacMillan,Shawn D. Mansfield,Zbigniew Stachurski,Robert Evans,Simon G. Southerton +4 more
TL;DR: A conserved subset of single FAS domain FLAs in Eucalyptus and Arabidopsis that have specific and high transcript abundance in stems are identified, particularly in stem cells undergoing secondary-wall deposition, and the phylogenetic conservation appears to extend to other dicots and monocots.
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Estimation of Eucalyptus delegatensis wood properties by near infrared spectroscopy
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Estimation of the physical wood properties of green Pinus taeda radial samples by near infrared spectroscopy
TL;DR: The application of near infrared (NIR) spectroscopy to the green wood of radial samples (simulated increment cores) and the development of calibrations for the prediction of wood properties are described and relationships between measured and NIR estimates for green wood were good.
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