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段落1

This is Scientific American 60-Second Science. I'm Cynthia Graber.This'll just take a minute.

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It's boating season.

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Which means it'll soon be time for that annoying ritual, the scraping of the barnacles.

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They latch on tight and don't let go.

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Barnacles can be a major pain: as they grow they build up calcium deposits under a boat's paint.

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And their interference with smooth fluid flow can decrease fuel efficiency by up to 40 percent, a major problem for large vessels.

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Currently, hull paint can be doped with poison, usually based on copper oxide, that leaches out slowly to kill the little critters.

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But the poison also escapes into the water and can kill other marine life.

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Now, researchers might have a better option: a paint additive that kills just the barnacles, using their own behavior against them.

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It's a toxin based on a molecule created by a bacterium.

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The researchers developed a method of embedding that toxin into the paint so that it only gets released when the barnacle penetrates the paint.

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The info was published in a university thesis.

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The scientists determined that the toxin works in low concentrations and could be effective for years.

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Which could lower the cost of paying the barnacle bill.

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Thanks for the minute, for Scientific American 60-Second Science. I'm Cynthia Graber.

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