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第1段
1 .This is Scientific American 60-Second Science. I'm Wayt Gibbs. Got a minute?
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2 .When I say "salmonella," what comes to mind? Eggs? Chicken?
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3 .(sound)
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4 .Actually, think carrots, cucumbers, cantaloupes.
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5 .(sound)
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6 .It's foods we eat raw that tend to cause the biggest salmonella outbreaks.
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7 .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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8 .The sticker part of the system contains a tiny sliver of metallic glass.
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9 .The side touching the food is coated with phage E2, a virus engineered to stick only to Salmonella typhimurium bacteria.
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10 .In the handheld scanner, a small wire coil creates an oscillating magnetic field,
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11 .which makes the glass sliver in the sticker vibrate in sympathy.
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12 .The coil can measure that rate of vibration.
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13 .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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14 .The scanner could pick up the shift and sound an alarm.
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15 .The work appears in the Journal of Applied Physics.
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16 .The system should work on most produce, but probably not on chicken or eggs,
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17 .because they can harbor salmonella on the inside.
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18 .Thanks for the minute, for Scientific American 60-Second Science. I'm Wayt Gibbs.
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