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首页> 外文期刊>RSC Advances >Structural hysteresis in dragline spider silks induced by supercontraction an X-ray fiber micro-diffraction study
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Structural hysteresis in dragline spider silks induced by supercontraction an X-ray fiber micro-diffraction study

机译：超应交X射线纤维微衍射研究诱导的拖线蜘蛛丝网中的结构滞后

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Interaction with water causes shrinkage and significant changes in the structure of spider dragline silks, which has been referred to as supercontraction in the literature. Preferred orientation or alignment of protein chains with respect to the fiber axis is extensively changed during this supercontraction process. Synchrotron X-ray micro-fiber diffraction experiments have been performed on Nephila clavipes and Argiope aurantia major and minor ampullate dragline spider fibers in the native dry, contracted (by immersion in water) and restretched (from contracted) states. Changes in the orientation of β-sheet nanocrystallites and the oriented component of the amorphous network have been determined from wide-angle X-ray diffraction patterns. While both the crystalline and amorphous components lose preferred orientation on wetting with water, the nano-crystallites regain their orientation on wet-restretching, whereas the oriented amorphous components only partially regain their orientation. Dragline major ampullate silks in both the species contract more than their minor ampullate silks.
机译：与水的相互作用导致蜘蛛拖拉线丝网结构的收缩和显着变化，这被称为文献中的超级共同。在该超级共同加工过程中，广泛地改变蛋白质链相对于纤维轴的优选取向或对准。在Nephila Clavipes和Argiope Amurantia Major和次氨疹爪蜘蛛纤维上进行了同步X射线微纤维衍射实验在天然干燥中，收缩（通过浸入水中）并重新入（收缩）状态。从广角X射线衍射图案确定了β-薄片纳米晶体的取向和非晶网络的取向分量的变化。虽然结晶和无定形组分都失去了用水润湿的优选取向，但是纳米微晶在湿式限制上恢复其取向，而取向的无定形组分仅部分地重新获得定向。拖拉主要适度的丝绸于各种物种的合同超过他们的小型安抚丝绸。

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