The transition from stiff to compliant materials in squid beaks
The transition from stiff to compliant materials in squid beaks
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DOI：
10.1126/science.1154117
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发表时间：
2008-03-28
期刊：
影响因子：
56.9
通讯作者：
Waite, J. Herbert
中科院分区：
文献类型：
--
作者：
Miserez, Ali;Schneberk, Todd;Waite, J. Herbert
洪堡乌贼Dosidicus gias的喙代表了已知的最硬和最硬的全有机材料之一。由于它深深地嵌入到柔软的口腔包络中，撞击力在喙和包络之间的传递方式是一个相当有科学意义的问题。在这里，我们表明，水化喙显示出一个很大的硬度梯度，从尖端到底部跨越两个数量级。这种梯度与甲壳素、水和富含组氨酸的蛋白质混合物的化学梯度相关，这些蛋白质含有3，4-二羟基苯基-L-丙氨酸(DOPA)，并通过组氨酸-DOPA交联形成进行广泛的稳定。这些发现可以作为确定在工程和生物应用中附着机械不匹配材料的设计原则的基础。
The beak of the Humboldt squid Dosidicus gigas represents one of the hardest and stiffest wholly organic materials known. As it is deeply embedded within the soft buccal envelope, the manner in which impact forces are transmitted between beak and envelope is a matter of considerable scientific interest. Here, we show that the hydrated beak exhibits a large stiffness gradient, spanning two orders of magnitude from the tip to the base. This gradient is correlated with a chemical gradient involving mixtures of chitin, water, and His- rich proteins that contain 3,4- dihydroxyphenyl- L- alanine ( dopa) and undergo extensive stabilization by histidyl- dopa cross- link formation. These findings may serve as a foundation for identifying design principles for attaching mechanically mismatched materials in engineering and biological applications.