蝉鼓室的形态和粘弹性

Macromol Pub Date : 2022-07-07 DOI:10.3390/macromol2030020
Fahrunnida, P. R. Sayekti, C. Robert, B. Retnoaji, Parvez Alam
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引用次数: 0

摘要

本文主要研究了鸣蝉(Dundubia rufivena)的蝉鼓的形态和粘弹性特性。形貌细节通过扫描电子显微镜和荧光显微镜确定,粘弹性性能通过动态机械热分析确定,并进一步通过差示扫描量热法支持。我们发现,鼓的水分蒸发开始于71.1°C,而鼓的玻璃化转变平均为150°C,这是一种甲壳素-弹性蛋白复合材料,尽管鼓的材料存在相当大的异质性,如鼓的半高峰宽(35.3°C)和表明第二阶段的肩峰,因此玻璃化转变平均为168°C。这第二阶段被认为反映了大规模分子钉钉和重组在弹性蛋白-几丁质界面的影响(可能通过特定的结合域)。此外,我们阐明了Dundubia rufivena鼓室的主要弹性区域是由几丁质多边形网格加强的,这是以往任何关于蝉鼓室的研究都没有描述过的形态学特征。我们通过比较不同频率和加载幅值下鼓的存储模量,为鼓的非线性弹性提供了证据。
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Morphological and Viscoelastic Properties of the Cicada Tymbal
This paper focusses on the morphological and viscoelastic properties of the cicada tymbal from the species Dundubia rufivena. 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 °C and the glass transition for the tymbal, which is a chitin–resilin composite, is on average 150 °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 °C) and the shoulder peak indicative of a second phase and hence glass transition at on average, 168 °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 Dundubia rufivena 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.
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