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Silk and sequence

机译:丝绸和序列

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摘要

The stiffness and strength of synthetic fibres both depend on the crystalline structure that develops during the spinning and drawing process. As the tangled mass of liquid polymer chains is sheared into a thread, small crystals form, separated by amorphous zones full of unresolved tangles. What determines the extent of crystallization? In synthetic fibres it is the degree to which the polymer is entangled, but because protein fibres such as silk are genetically encoded, it has seemed likely that the crystalline structure of silk would be controlled instead by spaced units having an amino-acid sequence conducive to β-sheet formation (crystallization) and units with sequences that inhibit such inter-chain ordering. In this way the fibre properties would result directly from the amino-acid sequence, rather than depending on the accidents of processing. But a new study by Trabbic and Yager may undermine this view. It shows that the properties of silk formed naturally are the same as those of silk spun synthetically from the same proteins in solution. The study implies that the drawing process, rather than primary sequence, exerts the dominant influence on crystallinity in the fibres.
机译:合成纤维的刚度和强度均取决于纺丝和拉伸过程中形成的晶体结构。当缠结的液态聚合物链被剪切成一条线时,会形成小晶体,并被充满未分解缠结的无定形区隔开。什么决定结晶程度?在合成纤维中,这是聚合物缠结的程度,但是由于蛋白质纤维(如丝绸)是经过基因编码的,因此似乎很可能将丝绸的晶体结构控制在,而不是通过间隔单元来控制,该间隔单元的氨基酸序列有助于β-折叠形成(结晶)和带有抑制这种链间有序性的序列的单元。这样,纤维性质将直接由氨基酸序列产生,而不是取决于加工事故。但是Trabbic和Yager的一项新研究可能会破坏这种观点。结果表明,天然形成的丝绸的性质与从溶液中相同蛋白质合成纺制的丝绸的性质相同。研究表明,牵伸过程而不是初级序列对纤维的结晶度起主要作用。

著录项

  • 来源
    《Nature》 |1998年第6683期|p.309311|共2页
  • 作者

    Paul Calvert;

  • 作者单位
  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 自然科学总论;
  • 关键词

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