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5 December 2013 11:26 am ,
Vol. 342 ,
An animal rights group known as the Nonhuman Rights Project filed lawsuits in three New York courts this week in an...
Researchers have been hot on the trail of the elusive Denisovans, a type of ancient human known only by their DNA and...
Thousands of scientists in the Russian Academy of Sciences (RAS) are about to lose their jobs as a result of the...
Dyslexia, a learning disability that hinders reading, hasn't been associated with deficits in vision, hearing, or...
Exotic, elusive, and dangerous, snakes have fascinated humankind for millennia. They can be hard to find, yet their...
Researchers have sequenced and analyzed the first two snake genomes, which represent two evolutionary extremes. The...
Snake venoms are remarkably complex mixtures that can stun or kill prey within minutes. But more and more researchers...
At age 30, Dutch biologist Freek Vonk has built up a respectable career as a snake scientist. But in his home country,...
- 5 December 2013 11:26 am , Vol. 342 , #6163
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Black Widows Spin Super Silk
31 December 1996 7:45 pm
Albuquerque, New Mexico--Need a strong elastic fiber? Try black widow silk. The thread spun by these deadly spiders is several times as strong as any other known spider silk--making it about as durable as Kevlar, a synthetic fiber used in bulletproof vests, according to a report presented here at the annual meeting of the Society for Integrative and Comparative Biology.
For several years, materials scientists and biologists have been studying the silk spun by orb spiders, such as the common garden spider Araneus diadematus, because the draglines that frame their flat, circular webs stretch without breaking and could be the basis for new synthetic fibers. But biologist Anne Moore of Scripps College in Claremont, California, is the first researcher to study silk used in cobwebs--three-dimensional, tangled networks of silk. She found that in some respects these strands are superior to those spun by orb spiders.
The black widow's cobweb consists of support scaffolding--a region in the middle for catching prey--and a series of silk anchor lines that hang down and snag walking insects. Moore cut pieces of the scaffold silk from the webs of five spiders and mounted each on a piece of cardboard with a slit in it. Next, she measured the amount of force needed to break the threads. Moore found that the black widow uses two kinds of silk for scaffolding. One can stretch an extra 25% of its length before breaking and is twice as strong as the orb spider's dragline. The other is even stronger than the first but slightly less elastic.
"It's astounding that the [black widow] silk has a combination of that strength and that extension," says spider-silk researcher John Gosline from the University of British Columbia in Vancouver, who says it's "very remarkable" that black widow silk is stronger than orb spider draglines.
Moore's team next plans to investigate the silk from other parts of the black widow web and study the chemical ingredients of this material to try to understand its unique blend of properties. From this information, Moore hopes that eventually "we can design our own materials." In that case, the venomous arachnid may have a greater impact on society than simply providing work for emergency-room doctors.