The research team deliberately exposed the barrier cells in their experiment to a dose of nanoparticles thousands of times higher than anything that would occur naturally.
该研究小组有意将他们实验中的细胞屏障层暴露于比任何可能自然发生的剂量都要高数千倍的纳米粒子之中。
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A team from Addenbrooke's Hospital in Cambridge, UK, recently exposed four children to a daily dose of peanut flour, starting with just 5 milligrams.
英国剑桥的艾登·布鲁克医院的一个小组最近让四个孩每天接触花生面，开始只有5毫克。
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Nakagawa said that an accumulated dose of 4 sievert kills 50% of those exposed within 60 days.