publication . Article . 2012

a spider s fang how to design an injection needle using chitin based composite material

Yael Politi; Matthias Priewasser; Eckhard Pippel; Paul Zaslansky; Jürgen Hartmann; Stefan Siegel; Chenghao Li; Friedrich G. Barth; Peter Fratzl;
  • Published: 22 Mar 2012 Journal: Advanced Functional Materials, volume 22, pages 2,519-2,528 (issn: 1616-301X, Copyright policy)
  • Publisher: Wiley
Spiders mainly feed on insects. This means that their fangs, which are used to inject venom into the prey, have to puncture the insect cuticle that is essentially made of the same material, a chitin-protein composite, as the fangs themselves. Here a series of structural modifi cations in the fangs of the wandering spider Cupiennius salei are reported, including texture variation in chitin orientation and arrangement, gradients in protein composition, and selective incorporation of metal ions (Zn and Ca) and halogens (Cl). These modifi cations infl uence the mechanical properties of the fang in a graded manner from tip to base, allowing it to perform as a multi-u...
free text keywords: Venom, Arthropod cuticle, Composite material, Spider, Chitin, chemistry.chemical_compound, chemistry, Materials science, Fang, Composite number, Cupiennius salei, biology.organism_classification, biology, Wandering spider
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