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The Structure of Nematodes

Alan F. Bird

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The Structure of Nematodes

Alan F. Bird

brak ocen

Rok wydania: 1971 Wydawnictwo: Academic Press » Rodzaj okładki: Twarda z obwolutą Wymiar: 15x20cm Ilość stron: 318 Waga: 0.85 kg TIN: T01407698 Stan: Używana

Stan egzemplarza: Z uszkodzeniami

Obwoluta/Oprawa: naderwana

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The nematode body is cylindrical, elongated and smooth with no limbs protruding, such as is seen in the common garden worm though generally on a smaller scale. The body is contained within a tough elastic cuticle which in many species forms elaborate structures useful for identification. The presence of a cuticle is similar to the structure of arthropods, however unlike them the nematode cuticle is not chitinous but is comprised mainly of collagens. The cuticle is non-living, produced by cells of the epidermis in most of the worm, allowing it to grown between moults of the worm without the need for shedding, although this does occur a number of times during the development of most worms. It is permeable to allow ions and water to pass through and therefore plays a key role in maintaining the hydrostatic pressure, which in most nematodes is relatively high inside the worm. The cuticle also acts as an anchoring point during locomotion as a skeleton does in mammalian species.

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