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Related Concept Videos

Wood Products01:21

Wood Products

139
Wood products encompass a broad range of materials crafted from wood strands, veneers, lumber, and even waste wood-like shreds, designed for both structural and nonstructural purposes. Various specialized wood products have been developed to enhance strength, durability, and versatility in building applications.
Glue-laminated wood, often referred to as glulam, combines multiple smaller pieces of dimensional lumber using adhesives to form a single, larger piece. Cross-laminated timber consists...
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Lumber01:19

Lumber

184
Lumber is derived from logs which are harvested, debarked, and processed into long pieces with a rectangular cross-section. The transformation of logs into lumber involves multiple steps, beginning with an automated saw that slices the log into slabs. These slabs are then transported via a conveyor belt to smaller saws, where they are cut into square-edged pieces of specific widths.
Initially, the surfaces of these lumber pieces are rough, and their dimensions may vary slightly from one end to...
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Cellulose and Pectic Polysaccharides01:15

Cellulose and Pectic Polysaccharides

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 Every plant cell has a cell wall that protects the cell, provides structural support, and gives the cell shape. Cellulose, the main structural component of the plant cell wall, makes up over 30% of plant matter. It is the most abundant organic compound on earth.  Cellulose is an unbranched polysaccharide composed of linear chains of glucose molecules linked by β (1→4) glycosidic bonds.
As a cell matures, its cell wall specializes according to its type. For example, the...
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Polymer Classification: Architecture01:14

Polymer Classification: Architecture

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Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
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Lumber Defects01:23

Lumber Defects

232
Lumber defects, which can affect both the appearance and structural integrity of wood, include a variety of growth and manufacturing flaws. Growth defects such as knots and knotholes occur where branches were once attached to the tree trunk, with knotholes forming when these knots fall out. Other natural defects include decay and insect damage, which compromise the wood's strength and durability.
Shakes are minor fractures that run along or across the wood's annual rings, while wane is...
232
Structural Properties and Dimensions of Lumber01:21

Structural Properties and Dimensions of Lumber

190
Wood's structural properties derive from fibers aligned along the tree's length, contributing significantly to its mechanical strength. Wood exhibits up to twenty times greater tensile strength along these fibers compared to across them, and generally shows better performance under compression than tension. The length of fibers varies, with hardwoods having fibers around one twenty-fifth inch long and softwoods ranging from one-eighth to one-third inch.
The strength characteristics of...
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Quantitative 31P NMR Analysis of Lignins and Tannins
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Quantitative 31P NMR Analysis of Lignins and Tannins

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Development and diversity of lignin patterns.

Aurélia Emonet1, Angela Hay1

  • 1Max Planck Institute for Plant Breeding Research, Cologne, North Rhine-Westphalia, 50829, Germany.

Plant Physiology
|June 1, 2022
PubMed
Summary
This summary is machine-generated.

Lignin

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Area of Science:

  • Plant biology
  • Cell wall
  • Biochemistry

Background:

  • Lignified cell walls provide structural support and hydrophobicity to plant tissues.
  • Lignin deposition patterns are crucial for specific cell functions.
  • Understanding lignin's role is key to plant development and biomechanics.

Purpose of the Study:

  • To explore the diverse functions of lignified cell walls in plants.
  • To investigate the genetic mechanisms controlling localized lignin deposition.
  • To compare lignin patterning across different cell types and species.

Main Methods:

  • Comparative analysis of lignified cell types.
  • Examination of genetic mechanisms for lignin deposition.
  • Case studies including xylem vessels, Casparian strips, and endocarp cells.

Main Results:

  • Xylem vessels function in water transport.
  • Casparian strips act as apoplastic barriers.
  • Asymmetric lignin in endocarp cells facilitates seed dispersal.

Conclusions:

  • Comparative studies enhance understanding of lignin patterning.
  • Lignin's precise deposition is vital for diverse plant structures and functions.
  • Genetic mechanisms for local lignin deposition show both conserved and divergent features across plant cell types.