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Přírodní vláknové kompozity & pevnost a ohebnost vlákenných svazků

Přírodní vláknové kompozity & pevnost a ohebnost vlákenných svazků. David Lukáš Alberts B.: Základy buněčné biologie, Espero Publishing, Ústí nad Labem, 1997. Celulosa:.

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Přírodní vláknové kompozity & pevnost a ohebnost vlákenných svazků

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  1. Přírodní vláknové kompozity&pevnost a ohebnost vlákenných svazků David Lukáš Alberts B.: Základy buněčné biologie, Espero Publishing, Ústí nad Labem, 1997

  2. Celulosa:

  3. Figure2. Colocalisation of cortical microtubules (green) with the CesA protein IRX3 (red) in developing xylem vessels of the Arabidopsis root. Colocalisation of IRX3 with microtubules give the characteristic orange colour.

  4. The orientation of cellulose microfibrils within the plant cell wall influences the direction in which the cell elongates. Microtubules direct the deposition of cellulose in the plant cell wall.

  5. One of the most important distinguishing features of plant cells is the presence of a cell wall. The relative rigidity of the cell wall renders plants sedentary, unlike animals, whose lack of this type of structure allows their cells more flexibility, which is necessary for locomotion. The plant cell wall serves a variety of functions. Along with protecting the intracellular contents, the structure bestows rigidity to the plant, provides a porous medium for the circulation and distribution of water, minerals, and other nutrients, and houses specialized molecules that regulate growth and protect the plant from disease.

  6. Kolagen, collagen

  7. Collagen from a Mouse Heart

  8. cytoskeleton

  9. On uniqueness of fibrous materials Ning Pan Fiber and Polymer Science Division ofTextiles and Clothing Biological and Agricultural Engineering Department University ofCalifornia One of the main features making fibrous structures the top choice in many applications has to do with its bending flexibility while still maintaining high tensile stiffness and strength

  10. The difference lies in the deformation mechanism. In a rope under bending or shearing load, individual fibers in the rope will slide or move over each other, given rooms for individual fibers to bend into desired shapes. In other word, the fiber is bent in respect to its own axis of radius r; whereas in the rod, the bending rigidity is much greater because of the greater diameter or bending moment of inertia. Rod I ..Bending moment r… Rod radius R

  11. The rod of equal mass (cross-section) A rope of N fibres

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