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

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When I say "salmonella," what comes to mind? Eggs? Chicken?

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(sound)

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Actually, think carrots, cucumbers, cantaloupes.

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(sound)

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It's foods we eat raw that tend to cause the biggest salmonella outbreaks.

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But an invention by physicists at Auburn University could make testing for bacteria as simple as slapping on a sticker and waving a handheld scanner.

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The sticker part of the system contains a tiny sliver of metallic glass.

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The side touching the food is coated with phage E2, a virus engineered to stick only to Salmonella typhimurium bacteria.

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In the handheld scanner, a small wire coil creates an oscillating magnetic field,

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which makes the glass sliver in the sticker vibrate in sympathy.

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The coil can measure that rate of vibration.

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If salmonella is present under the sticker, it gets snagged by the phage and makes the sticker a touch heavier, enough to change its vibration frequency.

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The scanner could pick up the shift and sound an alarm.

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The work appears in the Journal of Applied Physics.

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The system should work on most produce, but probably not on chicken or eggs,

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because they can harbor salmonella on the inside.

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Thanks for the minute, for Scientific American 60-Second Science. I'm Wayt Gibbs.

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