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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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ScienceShot: A Butterfly's Secret to Long Life
10 January 2013 3:10 pm
Live fast, die young. That seems to be the mantra of the animal kingdom. The more energy a creature burns, the more free radicals and other unstable, cell-damaging molecules its body produces—and in some cases, too many of these can shorten lifespans. But the Glanville fritillary butterfly (Melitaea cinxia) doesn't seem to have gotten the memo. When researchers measured the metabolic rates of this intricately patterned insect, they found that butterflies that expended the most energy during flight also lived the longest, whether they were lab-bound or released to island meadows in Finland. The findings suggest that the connection between oxidative stress—the long-term buildup of free radicals and similar detrimental molecules—and lifespan may be more complicated than previously thought. The ability to fly in top gear might indicate that a butterfly is naturally in better shape—whether through access to more-nutritious food or individual genetics—to override high metabolism's harmful side effects, the researchers reported online last month in The Journal of Experimental Biology. But they also wonder whether butterflies adapted to high-powered flight might have evolved ways to protect themselves from their own high-speed metabolisms.
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