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段落1

This is Scientific American 60-Second Science. I'm Christopher Intagliata .Got a minute?

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We humans take medicine when we're sick.

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As do our primate cousins.

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Chimps, for example, snack on a bitter African shrub to combat intestinal worms.

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But the habit extends even to invertebrates.

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Take fruit flies, which sip alcohol to ward off parasitic wasps.

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Or wood ants, which line their nests with anti-fungal, anti-bacterial tree sap.

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Now researchers in Finland report that ants there that have encountered a pathogenic fungus appear to fight the infection by eating foods high in free radicals.

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Those are molecules with a talent for causing cell damage, in this case, to the cells of the fungus.

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That's according to a study in the journal Evolution.

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The researchers collected some 400 wild ants.

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They exposed some to the fungus, and left the rest alone.

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Then they offered up a sort of eggy custard, either plain, or laced with free radicals in the form of hydrogen peroxide.

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Uninfected ants didn't want anything to do with the radical-rich food.

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Which makes sense.

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"Exactly, I mean we don't take painkillers on a daily basis, or we don't take anti-microbial agents on a daily basis.

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Because that would have really severe side effects on the organism."

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Dalial Freitak, an insect immunologist at the University of Helsinki.

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Sick ants, on the other hand, preferred the peroxide diet¡ªeven before developing a full-blown infection.

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And the medicine upped their odds of survival some 30 percent.

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"I would definitely go for it!"

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As for free radicals in the wild?

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Dalial says ants might get them from the honeydew substance that aphids produce.

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Or decomposing corpses, another ant favorite.

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No word on whether they sometimes seek out antioxidants.

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Thanks for the minute, for Scientific American 60-Second Science. I'm Christopher Intagliata.

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