Objective Based on two sets of data from occupational epidemiology, Benchmark dose( BMD) was applied to estimate biological exposure limit (BEL).

目的研究基准剂量（BMD）在制定镉生物接触限值中的应用。

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Study the biological limit of urine trans, trans-muconic acid for occupational exposure to benzene.

研究尿中反式，反粘康酸对苯职业接触的生物学极限。

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Without any available cohort studies to test exposure over a long period of time, though, they have had to rely on lab studies, which failed to find any clear or reproducible biological effects.

没有任何可用的队列研究，以测试长时间暴露在电磁场中的后果，他们不得不依赖实验室研究，目前未找到任何明确或可复制的生物效应。

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"We also carefully consider the sources of exposure of populations to radiofrequency electromagnetic fields, the nature of these fields as they come from various devices, including wireless phones, and we look carefully at the physical phenomenon by which exposure to such fields may perturb biological systems and lead to cancers."

VOA: special.2011.06.06

"Currently, we have identified no infectious agent common to all of the cases, " the statement said, adding that no evidence exists that the cases were caused by exposure to chemical or biological weapons, SARS or environmental toxins.

CNN: Army hunts cause of pneumonia in troops