No mortality urred during 196 hours of exposure to NaC1.

无死亡发生在一九六小时接触氯化钠。

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After 72 hours of exposure to ambient light, strands ofnanoparticles twisted and bunched together. Credit: Nicholas Kotov

经过72小时地暴露于环境光下面以后，可把多股纳米粒子扭曲和捆绑在一起。

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This is called anaphylaxis and can happen within minutes to hours of exposure to the substance that the person is allergic to.

这就是所谓的过敏性反应和可能发生几分钟内，以小时暴露的实质该人是过敏。

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heart attacks,strokes,heart failure increases probably five to ten times greater than it does over just a few hours of exposure."

VOA: standard.2010.08.04

The rabbits were subjected to radiation equivalent to about 16 hours of sunlight exposure, condensed into a half-hour period, says Cristina Schnider, Vistakon's senior director of medical affairs.

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The pills must be given between forty minutes before and several hours after the moment of radiation exposure.

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The second phase, which occurs 12 to 24 hours after exposure, involves the recruitment of inflammatory cells to the site of inflammation.

BBC: NEWS | Health | Eyelid protein is key to allergy