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Contributions to the understanding of the fine structure of the wood cell wall were also made by Albert Frey-Wyssling and Reginald Dawson Preston, who employed light microscopy-based techniques. In parallel, Johannes Liese integrated his expertise in wood anatomy and decay mechanisms with extensive studies on wood protection. [21]
InsideWood is an online resource and database for wood anatomy, serving as a reference, research, and teaching tool. Wood anatomy is a sub-area within the discipline of wood science. [1] [2] This freely accessible database is purely scientific and noncommercial.
Bordered pits in the wood of Picea abies. The top section is a cross-sectional view with bordered pits shown between adjacent cells, and the bottom section is a radial view with numerous bordered pits shown. Pits are relatively thinner portions of the cell wall that adjacent cells can communicate or exchange fluid through.
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Most true fungi have a cell wall consisting largely of chitin and other polysaccharides. [28] True fungi do not have cellulose in their cell walls. [16] In fungi, the cell wall is the outer-most layer, external to the plasma membrane. The fungal cell wall is a matrix of three main components: [16]
The next layer is the cambium, a very thin layer of undifferentiated cells that divide to replenish the phloem cells on the outside and the xylem cells to the inside. The cambium contains the growth meristem of the trunk. [3] Directly inside of the cambium is the sapwood, or the live xylem cells. These cells transport the water through the tree.
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Some eukaryotic cells (plant cells and fungal cells) also have a cell wall. Inside the cell is the cytoplasmic region that contains the genome (DNA), ribosomes and various sorts of inclusions. [2] The genetic material is freely found in the cytoplasm. Prokaryotes can carry extrachromosomal DNA elements called plasmids, which are usually circular.