Weatherly, Nicolette (2012) Invertebrate zoology. Research World, Delhi, India. ISBN 9788132331520
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Abstract
Arthropods are covered with a tough or resistant exoskeleton, which may be mineralized or constructed of a tough polymer such as chitin. This external skeleton is moulted as the organism grows. A typical arthropod exoskeleton is a multi-layered structure with four functional regions: epicuticle, procuticle, epidermis and basement membrane. Of these, the epicuticle is a multi-layered external barrier that, especially in terrestrial arthropods, acts as a barrier against desiccation. The strength of the exoskeleton is provided by the underlying procuticle, which is in turn secreted by the epidermis. Arthropod cuticle is a biological composite material, consisting of two main portions: fibrous chains of alpha-chitin within a matrix of silk-like and globular proteins, of which the most well-known is the rubbery protein called resilin. The relative abundance of these two main components varies from approximately 50/50 to 80/20 chitin protein, with softer parts of the exoskeleton having a higher proportion of chitin. Although the cuticle is relatively soft when first secreted, it soon hardens in a poorly-understood process that involves dehydration and/or tanning mediated by hydrophobic chemicals called phenolics. Different types of interaction between the proteins and chitin leads to varying mechanical properties of the exoskeleton.
| Item Type: | Book |
|---|---|
| Subjects: | Q Science > QL Zoology |
| Divisions: | Electronic Books |
| Depositing User: | Esam @ Hisham Muhammad |
| Date Deposited: | 02 Jan 2023 03:26 |
| Last Modified: | 02 Jan 2023 03:26 |
| URI: | http://odlsystem2.utm.my/id/eprint/3944 |
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