A spider's biological vibration filter: micromechanical characteristics of a biomaterial surface.
A spider's biological vibration filter: micromechanical characteristics of a biomaterial surface.
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DOI：
10.1016/j.actbio.2014.07.023
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发表时间：
2014-11
影响因子：
9.7
通讯作者：
Seth L. Young;Marius Chyasnavichyus;M. Erko;F. Barth;P. Fratzl;I. Zlotnikov;Yael Politi;V. Tsukruk
中科院分区：
文献类型：
--
作者：
Seth L. Young;Marius Chyasnavichyus;M. Erko;F. Barth;P. Fratzl;I. Zlotnikov;Yael Politi;V. Tsukruk
在中美洲流浪蜘蛛（Cupiennius salei）的所有腿上都发现了一种应变感应琴状器官（HS-10），它可以检测到求偶、猎物和捕食者的振动，这些振动是由它所处的植物传递的。有人认为，直接邻近感觉器官的表皮垫的粘弹性有助于器官的显着高通特性。在这里，我们调查的表皮垫生物材料的微机械性能，以寻求更深入地了解其对振动传感器的功能的影响。这些属性被认为是一个有效的适应选择性检测的信号频率>40赫兹。使用表面力光谱映射，我们确定在15-40 °C的温度范围内在各种加载频率下的垫表面的弹性模量。在玻璃态下，弹性模量为100 MPa，而在橡胶态下，弹性模量降低到20 MPa。根据时间-温度叠加原理对这些数据进行分析，以构建将力学性能、温度和刺激频率相关联的主曲线。通过估计损耗和储能模量与温度和频率的关系，可以与电生理学实验进行直接比较，并且发现能量耗散发生在频率窗口内，该频率窗口的位置由环境温度控制。
A strain-sensing lyriform organ (HS-10) found on all of the legs of a Central American wandering spider (Cupiennius salei) detects courtship, prey and predator vibrations transmitted by the plant on which it sits. It has been suggested that the viscoelastic properties of a cuticular pad directly adjacent to the sensory organ contribute to the organ’s pronounced high-pass characteristics. Here, we investigate the micromechanical properties of the cuticular pad biomaterial in search of a deeper understanding of its impact on the function of the vibration sensor. These properties are considered to be an effective adaptation for the selective detection of signals for frequencies >40 Hz. Using surface force spectroscopy mapping we determine the elastic modulus of the pad surface over a temperature range of 15–40 °C at various loading frequencies. In the glassy state, the elastic modulus was ∼100 MPa, while in the rubbery state the elastic modulus decreased to 20 MPa. These data are analyzed according to the principle of time–temperature superposition to construct a master curve that relates mechanical properties, temperature and stimulus frequencies. By estimating the loss and storage moduli vs. temperature and frequency it was possible to make a direct comparison with electrophysiology experiments, and it was found that the dissipation of energy occurs within a frequency window whose position is controlled by environmental temperatures.