Download Biophysics by Eberhard Schnepf (auth.), Professor Dr. Walter Hoppe, PDF

By Eberhard Schnepf (auth.), Professor Dr. Walter Hoppe, Professor Dr. Wolfgang Lohmann, Professor Dr. Hubert Markl, Professor Dr. Hubert Ziegler (eds.)

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At the periphery the Golgi cisternae are perforated and continue into tubules which in places dilate to form vesicles. In general, the cisternae of a stack differ so that a dictyosome has a polar structure (Fig. 6). At one face new Golgi cisternae are formed, often by the fusion of small vesicles which bud off from smooth regions of ER cisternae. They transmit the export proteins. The Golgi cisternae on this face, theformingface, often have a wide lumen, the peripheral vesicles are small, their content is less dense.

They differ in size and in the position of the kinetochore (centromere) a constriction, in which the spindle fibers attach in mitosis (Sect. 1). Additional secondary constrictions likewise can be found; often they are associated with the nucleolar organizer (Sect. 3). In somatic cells of higher animals and plants there are two homologous chromosomes, one of them from the In metabolically active nuclei there are one to several nucleoli, dense inclusions of the karyoplasm with a relatively high RNA content.

The fibrillar structures provide rigidity and elasticity for the cell wall. The compressive strength is increased when the wall is incrusted with lignin. Lignification is found especially in the cell walls of the water transport system and of the sclerenchyma. It allowed the plant to occupy the land in evolution. Minerals, tannins, etc. are also found to incrust walls. Epidermal and peridermal cells have layers (accrustations) of cutin on the outer face of epidermal walls or of suberin on the inner face of walls to form cuticle and cork respectively.

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