Fibers animal kingdom

Not all neurons have NFs. Indeed, one entire phylum in the animal kingdom, arthropods, expresses only type V nuclear lamins so arthropod cells have no IF cytoskeletal structures at all. In addition, mature oligodendrocytes lack IFs although their embryonic precursors contain vimentin. Clearly, the IFs are not essential for cell survival. Yet, in large myelinated fibers, NFs make up the bulk of axonal volume and represent a substantial fraction of the total protein in brain. In most organisms, IFs in both glia... 

Natural polymeric fibers can originate in the animal kingdom or vegetable kingdom. We give below a brief description of these. 

Animal fibers are basically made up of some kind of protein. Collagen, a crystalline material, is the basic structural fiber of the animal kingdom. It is found in virtually all animals, usually as a component of a complex plant connective tissue. Its structure is based on a helical arrangement of three, noncoaxial, helical polypeptides, stabilized by interchain hydrogen bonds. The three helical... 

The animal kingdom is also rich in fibers, ranging from silk to wool to human hair. Bone structure and teeth of most animals and fish are fibrous in stmcture. Hides, skins, tendons, and other parts are either natural fibers or can be converted into fibers by processing. 

Although natural fibers are usually classified according to their origin as animal or vegetable, chemists generally think of them from the viewpoint of their chemical nature as protein or cellulosic. The mineral kingdom also produces an important fiber—asbestos —which has had Incited use in the textile field because of processing difficulties. 

Fibers based on natural materials are divided into two categories natural fibers found in the plant, animal, and mineral kingdoms and regenerated cel-lulosic fiber, which are manmade fibers made out of natural polymers. 

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