It is no wonder manufacturers are clamoring for spider silk. In the consumer pipeline: high-performance fabrics for athletes and stockings that never run. Think parachute cords and suspension bridge cables. A steady supply of spider silk would be worth billions of dollars-but how to produce it? Harvesting silk on spider farms does not work because the territorial arthropods have a tendency to devour their neighbors.

　　Now, scientists at the biotechnology Nexia are spinning artificial silk modeled after Goldern Orb dragline. The first step: extract silk-making genes from the spiders. Next, implant the genes into goat egg cells. The nanny goats that grown from the eggs secrete dragline silk proteins in their milk. The young goats pass on the silk-making gene without any help from us, says Nexia president Jeffrey Turner. Nexia is still perfecting the spinning process, but they hope artificial spider silk will soon be snagging customers as fast as the real thing snags bugs. [理工类C]

　　奇妙的网

　　蜘蛛网对蜘蛛来说不仅仅是家，它们还是奇妙的引虫入网的陷阱。世界最棒的织网者可能是Goldern Orb Weaver的蜘蛛。雌性的Orb Weaver可以织出很细的丝，连被捕的昆虫都看不见。但却是坚韧得可以将一只飞入网中的鸟缠住而不弄断。

　　那么蜘蛛网为何有如此强的力度呢?有一种网丝有超强的弹力，叫做蜘蛛的避敌丝。当雌性的蜘蛛准备织蛛网的辐条和框架时，它就用腿从一个空的喷嘴里勾出轻飘飘的丝线，放到肚子里面。避敌丝不粘，因此蜘蛛可以沿着它来回活动编织，从而来编织网的标志性螺旋。

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