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Nanofiber Formation in Spider Dragline-Silk as Probed by Atomic Force Microscopy and Molecular Pulling

机译:蜘蛛爪线 - 丝绸中的纳米纤维形成如原子力显微镜探测和分子拉动

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Despite the extensive interest in its remarkable materials properties,the structure of spider dragline silk is not yet known.Indirect structural information is thus of particular interest.New data are presented here from two probe microscopy techniques-atomic force microscopy (AFM) and single-molecule force spectroscopy,or 'molecular pulling.'Using a soluble synthetic protein from dragline silk,segmented silk nanofibers have been observed by AFM.Molecular pulling (Force Spectroscopy) has revealed sawtooth-like rupture peaks,indicative of the sacrifical bonds and hidden lengths seen in molecules of other self-healing biometerials.A model is presented for the folding of single dragline-silk molecules and the arangement of these molecules into nanofibers.The relationship is discussed between these molecular/nanoscale results and the materials properties of natural and artificial dragline silks.
机译:尽管对其显着材料的性质进行了广泛的兴趣,但尚未知道蜘蛛龙丝的结构。因此,载体结构信息是特别的兴趣。这里从两种探针显微镜技术 - 原子力显微镜(AFM)和单一 - 分子力谱或“分子拉伸。通过AFM观察到来自拖拉丝的可溶性合成蛋白,通过AFM .MOM分子拉动(力光谱)透露了锯齿状的破裂峰,表示牺牲粘接和隐藏长度在其他自我愈合的学生分子中看到的。提出了一种模型,用于折叠单次鳞片丝分子,并将这些分子的折叠成纳米纤维。这些分子/纳米级结果与自然和人工的材料性质之间讨论了关系拖拉丝网。

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