Results 141 to 150 of about 2,011 (175)

Microfibril Angle: Measurement, Variation and Relationships – A Review

IAWA Journal, 2008
Microfibril angle (MFA) is perhaps the easiest ultrastructural variable to measure for wood cell walls, and certainly the only such variable that has been measured on a large scale. Because cellulose is crystalline, the MFA of the S2 layer can be measured by X-ray diffraction.
openaire   +1 more source

Modeling Radial Variation in Microfibril Angle of Scots Pine

Advanced Materials Research, 2011
Microfibril angle (MFA) was determined at each growth ring from disks at breast height (1.3 m) from four scots pine (Pinus sylvestris) trees grown in northeastern China. Significant variation in microfibril angle was observed among growth rings. MFA at breast height showed a decreasing trend from pith to bark for each tree.
Yao Xiang Li, Li Chun Jiang
openaire   +1 more source

Cellulose microfibril angles in a spruce branch and mechanical implications

Journal of Materials Science, 2001
The nanostructure of the wood cell wall and, in particular the tilt angle of the cellulose fibrils versus the longitudinal cell axis (microfibril angle, MFA), are known to play a key role in determining the mechanical properties of wood. A variation of microfibril angles during growth may therefore be regarded as a means to adapt to different loading ...
Farber, J., Lichtenegger, H., Reiterer, A., Stanzl-Tschegg, S., Fratzl, P.   +4 more
openaire   +2 more sources

Determination of microfibril angle distribution by X-ray diffraction

Wood Science and Technology, 2005
X-ray diffraction is a well-established method for the determination of the mean microfibril angle (MFA). When the sample is a slice of wood variations in the fibre orientation, the shape of the cells, and the measurement geometry affect the intensity curve.
Matti-P. Sarén, Ritva Serimaa
openaire   +1 more source

Pontamine fast scarlet 4B bifluorescence and measurements of cellulose microfibril angles

Journal of Microscopy, 2017
SummaryPontamine fast scarlet 4B is a red paper and textiles dye that has recently been introduced as a fluorescent probe for plant cell walls. Pontamine exhibits bifluorescence, or fluorescence dependent on the polarization of the excitation light: Because cellulose is aligned within the cell wall, pontamine‐labelled cell walls exhibit variable ...
J. THOMAS, N.A. IDRIS, D.A. COLLINGS
openaire   +2 more sources

Microfibril orientation in wood cells: new angles on an old topic

Trends in Plant Science, 2000
Although it is essential to obtain experimental evidence about any role for microtubules in microfibril orientation, the difficulty of accessing the developing wood cells in trees has to date required the use of excised, fixed material. A system in which cell-biological events can be followed, and experimentally manipulated, in vivo is clearly ...
openaire   +2 more sources

Variation of microfibril angles and chemical composition: Implication for functional properties

Journal of Materials Science Letters, 2003
Wood cell walls are a composite material consisting of cellulose, hemicellulose, lignin and other minor components, such as pectin and extractives. Two main factors, cellulose microfibril angle (MFA) in S2 layer (thickest layer) and chemical composition, govern functional properties of the cell wall such as Young’s modulus and growth-stress.
R. Hori, H. Suzuki, T. Kamiyama, J. Sugiyama   +3 more
openaire   +1 more source

MICROFIBRIL ANGLES IN THE ROOT WOOD OF PINUS RADIATA AND PINUS NIGRA

IAWA Journal, 2001
Microfibril angles of the S2 layer and tracheid lengths were measured in the root wood of Pinus nigra, and the root and stem wood of Pinus radiata. Within 10 mm (the first 2–3 growth rings) from the root centre, microfibril angles were large in the wood of both species, ranging from 25° to 40°.
Junji Matsumura, Brian G. Butterfield
openaire   +1 more source

Microfibril angles of softwood and hardwood pulp fibres

2014
The general relationship between the stress-strain behaviour and MFA of fibres is a well-known fact but little is known about variations within a single fibre or the effect of refining. Therefore, a simple method to determine MFA of selected single fibres is required.
Heinemann, Sabine, Retulainen, Elias
openaire   +1 more source

Regression models on the age-affecting and microfibril angle of Acacia mangium

Journal of the Indian Academy of Wood Science, 2010
Diffraction patterns arising from crystal planes of various sample forms of wood trees had attracted scientific research in determining the crystallographic measurements. As such the tropical hard wood in Sabah, Acacia mangium was chosen for experimental data. Age-contributing factors were measured; the angle of reflection (θ), relative intensity, full
Noraini Abdullah, Tamer A. Tabet, Fauziah Aziz   +2 more
openaire   +1 more source