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  Function-related adaptations of ultrastructure, mineral phase distribution and mechanical properties in the incisive cuticle of mandibles of Porcellio scaber Latreille, 1804

Huber, J., Fabritius, H.-O., Griesshaber, E., & Ziegler, A. S. (2014). Function-related adaptations of ultrastructure, mineral phase distribution and mechanical properties in the incisive cuticle of mandibles of Porcellio scaber Latreille, 1804. Journal of Structural Biology, 188(1), 1-15. doi:10.1016/j.jsb.2014.09.002.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0026-B4AC-B Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0026-B4AD-9
Genre: Journal Article

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 Creators:
Huber, Julia1, Author              
Fabritius, Helge-Otto2, Author              
Griesshaber, Erika3, Author              
Ziegler, Andreas Siegfried4, Author              
Affiliations:
1Central Facility for Electron Microscopy, University of Ulm, Albert-Einstein-Allee 11, Ulm, Germany, ou_persistent22              
2Biological Composites, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863385              
3Department of Earth and Environmental Sciences, LMU Munich, Germany , ou_persistent22              
4Central Facility for Electron Microscopy, University of Ulm, Albert-Einstein-Allee 11, Ulm 89069, Germany, ou_persistent22              

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Free keywords: animal experiment; animal model; animal tissue; arthropod; Article; controlled study; cuticle; fiber; mandible; nonhuman; Porcellio scaber; ultrastructure
 Abstract: In terrestrial isopods the mandibles consist of a corpus carrying strong muscle tissue, and a pars incisiva (PI) that cuts dry leaves into smaller ingestible pieces. We studied the cuticle of the PI of Porcellio scaber in order to understand region-dependent differences in its ultrastructure, composition, and the resulting mechanical properties, employing several microscopic and analytical techniques as well as nanoindentation experiments. The cuticle of the incisive tip is not mineralized and consists of an unusually thick epicuticle containing thin fibrils, two subjacent cuticular layers, and a central core containing fibrils of different orientation, either longitudinal or circumferential. A thick epicuticle of the middle region just behind the tip projects long epicuticular extensions into the subjacent endocuticle, likely to prevent delamination. A distinct exocuticular layer is lacking in the middle region. Most chitin-protein fibrils within the endocuticle are oriented in parallel pointing towards the tip. Surprisingly, the middle region is mineralized by amorphous calcium phosphate (ACP) only. Near the base, ACP is successively replaced by amorphous calcium carbonate and calcite is restricted to a distal layer in the base. At the transition between middle and base, the epicuticle forms a hybrid material containing fibrils of the exocuticle. Nanoindentation experiments reveal an increase of the stiffness and hardness from the tip towards the base and significantly higher values on transversal in comparison to longitudinal planes. The results suggest that ultrastructure and composition are adapted for conveying high forces from a rather thin cutting edge to the stable base of the PI. (C) 2014 Elsevier Inc. All rights reserved.

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Language(s): eng - English
 Dates: 2014-10-01
 Publication Status: Published in print
 Pages: 15
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: ISI: 000343354300001
DOI: 10.1016/j.jsb.2014.09.002
 Degree: -

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Title: Journal of Structural Biology
  Other : J. Struct. Biol.
Source Genre: Journal
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Publ. Info: Orlando, Fla. : Academic Press
Pages: - Volume / Issue: 188 (1) Sequence Number: - Start / End Page: 1 - 15 Identifier: ISSN: 1047-8477
CoNE: /journals/resource/954922650160