西方黑寡妇蜘蛛（Latrodectus hesperus）蛛网丝的材料特性。

Material properties of cobweb silk from the black widow spider Latrodectus hesperus.

作者信息

Moore A M, Tran K

机构信息

Department of Biological Sciences, The University of the Pacific, Stockton, CA 95211, USA.

出版信息

Int J Biol Macromol. 1999 Mar-Apr;24(2-3):277-82. doi: 10.1016/s0141-8130(98)00090-7.

DOI:10.1016/s0141-8130(98)00090-7

PMID:10342775

Abstract

We present the material analysis of scaffolding silk from the cobweb of the black widow spider Latrodectus hesperus. 30 strands were tested from the webs of nine spiders. Strands were stretched at 0.211 mm/s as force and extension were recorded. Cross-sectional area was measured under 1000 x oil-immersion light microscopy. The stress strain curve shows that cobweb silk is a distinct material from other known spider silks. The average breaking point for this cobweb silk is 1.1 +/- 0.5 GPa at 0.22 +/- 0.05 strain. All samples increased stiffness as they were stretched, but to different extents. Variation in stiffness might be due to differential crystallization or alignment of the silk proteins during stretching.

摘要

我们展示了对西方黑寡妇蜘蛛（Latrodectus hesperus）蛛网中脚手架丝的材料分析。从9只蜘蛛的蛛网上测试了30根丝。以0.211毫米/秒的速度拉伸丝，同时记录力和伸长量。在1000倍油浸光学显微镜下测量横截面积。应力应变曲线表明，蛛网丝是一种与其他已知蜘蛛丝不同的材料。这种蛛网丝的平均断裂点在应变0.22±0.05时为1.1±0.5吉帕。所有样品在拉伸时刚度都增加，但程度不同。刚度的变化可能是由于拉伸过程中丝蛋白的结晶差异或排列不同所致。