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Sample text
Descriptions of these features and others can be found in Panshin and deZeeuw (4). A complete description of these cell types and their distribution can be found in Panshin and deZeeuw (4). The pit membranes do not reveal any openings. Micrometer bar 1 mm. ), ACS Symposium Series 43, 1977. can be applied to longitudinal epithelial cells. 2— Transverse Cells From the standpoint of volume of wood occupied and their presence in all softwood species, the most important transversely oriented cell type is the ray parenchyma.
Micrometer bar 1 mm. ), ACS Symposium Series 43, 1977. can be applied to longitudinal epithelial cells. 2— Transverse Cells From the standpoint of volume of wood occupied and their presence in all softwood species, the most important transversely oriented cell type is the ray parenchyma. Ray tracheids are present in an even smaller volume and are found consistently in pines, spruces, larches, hemlocks, Douglas fir and Alaska yellow cedar (4). Fusiform rays contain a resin canal and are characterized by a fusiform shape as seen in the tangential plane (Fig.
Table 3 indicates the percentage of composition, polymeric nature, and role of the chemical constituents. The cellulose molecule, which ranges from 2500–5000 nm in length, passes through several crystalline and amorphous regions. The affinity of water for cellulose is the result of the large number of OH groups present. Some typical sugars are glucose, galactose, mannose, xylose, and arabinose. Without the presence of lignin, wood would be unable to carry out the support role. Extractives are found in varying amounts in the heartwood zone.