Cross-sections at the right place in the uterus of a female Ascaris megalocephala can be used to locate eggs in different stages of the first segmentation mitosis*.
Wednesday, 19 September 2018
Wednesday, 5 September 2018
Sclerenchyma cells are derived from parenchymal cells, which form secondary thickening edges in the cell wall. These are rich in lignin, which practically does not allow any substances getting through, which finally leads to dying of the cell content. Sclerenchyma is thus usually a dead support tissue, whose task is mainly to provide support an mechanical strength. Depending on the shape of the cells, stone cells (sclereids) and sclerenchyma fibers are distinguished.