Mechanical properties of secondary wall
and compound comer middle lamella near the phenol-formaldehyde (PF) adhesive bond line measured by nanoindentation.
The tangential walls of such cells are often thin, or bear large pits, simple or bordered, ("nodular," or "nodulated") with intervening secondary wall
portions that define the large size of the pits.
gigantea macrocyst showed irregular thick wall, with placentiformes protrusions and a secondary wall
of connective tissue (MUNDAY & OBENDORF, 1984).
NAC SECONDARY WALL
THICKENING PROMOTING FACTOR1 (NST1) and NST3 (also known as SECONDARY WALL-ASSOCIATED NAC DOMAIN PROTEIN1, SND1) belong to a subfamily of the NAC family related to the VND subfamily.
The cells of the primary wall, in gray, and the cells of the secondary wall
(lignified), in dark gray.
SEM micrographs provided high-resolution images showing the helical secondary wall
sheathed by a thin, primary wall (Figure 5), the latter being largely transparent to the light microscope.
The poplar wood-associated NAC domain transcription factors (PtrWNDs) also activate a set of downstream transcription factors, and together, they coordinate the regulation of secondary wall
biosynthesis [23, 59].
This family of transcription factorsis involved in a lot of plant developmental processes, including shoot apical meristem formation , hormone signaling [2, 6], regulation of cell division and cell expansion , control of secondary wall
formation [8-10], and responses to various stresses [11-14].
It has been detected in higher quantities in the secondary wall
of fibers, vessels and tracheids, providing mechanical support and rigidity.
Inspectors described conditions of the primary and secondary wall
elements relative to the extent, severity, and urgency of observable distresses, and then rated them numerically, giving due consideration to data reliability.
The density of the secondary wall
is markedly lower, with the [S.sub.2] layer appearing fairly uniform in density.