Morphological and Viscoelastic Properties of the Cicada Tymbal
This paper focusses on the morphological and viscoelastic properties of the cicada tymbal from the species <i>Dundubia rufivena</i>. Morphological details were determined by scanning electron and fluorescence microscopy, while the viscoelastic properties were determined by dynamic mechan...
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| Format: | Article |
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MDPI AG
2022-07-01
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| Series: | Macromol |
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| Online Access: | https://www.mdpi.com/2673-6209/2/3/20 |
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| author | Fahrunnida Puspa Restu Sayekti Colin Robert Bambang Retnoaji Parvez Alam |
| author_facet | Fahrunnida Puspa Restu Sayekti Colin Robert Bambang Retnoaji Parvez Alam |
| author_sort | Fahrunnida |
| collection | DOAJ |
| description | This paper focusses on the morphological and viscoelastic properties of the cicada tymbal from the species <i>Dundubia rufivena</i>. Morphological details were determined by scanning electron and fluorescence microscopy, while the viscoelastic properties were determined by dynamic mechanical thermal analysis, and further supported by differential scanning calorimetry. We find that water evaporation from the tymbal begins at 71.1 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mrow></mrow><mo>°</mo></msup></semantics></math></inline-formula>C and the glass transition for the tymbal, which is a chitin–resilin composite, is on average 150 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mrow></mrow><mo>°</mo></msup></semantics></math></inline-formula>C, though there is considerable heterogeneity in the material of the tymbal, as indicated by the half height peak width of the tymbal (35.3 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mrow></mrow><mo>°</mo></msup></semantics></math></inline-formula>C) and the shoulder peak indicative of a second phase and hence glass transition at on average, 168 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mrow></mrow><mo>°</mo></msup></semantics></math></inline-formula>C. This second phase is assumed to reflect the effects of large-scale molecular pinning and restructuring at resilin–chitin interfaces (possibly via specific binding domains). In addition, we elucidate that the predominantly resilin regions of the tymbal of <i>Dundubia rufivena</i> is reinforced by a polygonal mesh of chitin, a morphological feature that has not been described in any previous research on the cicada tymbal. We provide evidence for nonlinear elasticity in the tymbal by comparing the storage modulus of the tymbal at different frequencies and loading amplitudes. |
| first_indexed | 2024-03-09T23:20:31Z |
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| issn | 2673-6209 |
| language | English |
| last_indexed | 2024-03-09T23:20:31Z |
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| spelling | doaj.art-6e51c6c1776544a0a2b36b2d66f821b22023-11-23T17:27:34ZengMDPI AGMacromol2673-62092022-07-012331532310.3390/macromol2030020Morphological and Viscoelastic Properties of the Cicada TymbalFahrunnida0Puspa Restu Sayekti1Colin Robert2Bambang Retnoaji3Parvez Alam4School of Engineering, The University of Edinburgh, Edinburgh EH8 9YL, UKSchool of Engineering, The University of Edinburgh, Edinburgh EH8 9YL, UKSchool of Engineering, The University of Edinburgh, Edinburgh EH8 9YL, UKLaboratory of Animal Structure and Development, Faculty of Biology, Gadjah Mada University, Yogyakarta 40135, IndonesiaSchool of Engineering, The University of Edinburgh, Edinburgh EH8 9YL, UKThis paper focusses on the morphological and viscoelastic properties of the cicada tymbal from the species <i>Dundubia rufivena</i>. Morphological details were determined by scanning electron and fluorescence microscopy, while the viscoelastic properties were determined by dynamic mechanical thermal analysis, and further supported by differential scanning calorimetry. We find that water evaporation from the tymbal begins at 71.1 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mrow></mrow><mo>°</mo></msup></semantics></math></inline-formula>C and the glass transition for the tymbal, which is a chitin–resilin composite, is on average 150 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mrow></mrow><mo>°</mo></msup></semantics></math></inline-formula>C, though there is considerable heterogeneity in the material of the tymbal, as indicated by the half height peak width of the tymbal (35.3 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mrow></mrow><mo>°</mo></msup></semantics></math></inline-formula>C) and the shoulder peak indicative of a second phase and hence glass transition at on average, 168 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mrow></mrow><mo>°</mo></msup></semantics></math></inline-formula>C. This second phase is assumed to reflect the effects of large-scale molecular pinning and restructuring at resilin–chitin interfaces (possibly via specific binding domains). In addition, we elucidate that the predominantly resilin regions of the tymbal of <i>Dundubia rufivena</i> is reinforced by a polygonal mesh of chitin, a morphological feature that has not been described in any previous research on the cicada tymbal. We provide evidence for nonlinear elasticity in the tymbal by comparing the storage modulus of the tymbal at different frequencies and loading amplitudes.https://www.mdpi.com/2673-6209/2/3/20cicadatymbalresilinviscoelasticmorphologychitin |
| spellingShingle | Fahrunnida Puspa Restu Sayekti Colin Robert Bambang Retnoaji Parvez Alam Morphological and Viscoelastic Properties of the Cicada Tymbal Macromol cicada tymbal resilin viscoelastic morphology chitin |
| title | Morphological and Viscoelastic Properties of the Cicada Tymbal |
| title_full | Morphological and Viscoelastic Properties of the Cicada Tymbal |
| title_fullStr | Morphological and Viscoelastic Properties of the Cicada Tymbal |
| title_full_unstemmed | Morphological and Viscoelastic Properties of the Cicada Tymbal |
| title_short | Morphological and Viscoelastic Properties of the Cicada Tymbal |
| title_sort | morphological and viscoelastic properties of the cicada tymbal |
| topic | cicada tymbal resilin viscoelastic morphology chitin |
| url | https://www.mdpi.com/2673-6209/2/3/20 |
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