This involves exposing the patient to various concentrations of suspected chemicals or other substances by injection.

Studies on people exposed to high concentrations of benzene in the workplace have shown it is linked with leukaemia.

Breast-fed infants are only at risk if their mothers have been previously exposed to high concentrations of lead.

There must be a series of samples exposed to different concentrations of contaminant and a control sample.

First, samples are exposed to different concentrations of contaminant.

It can cause illness and death, but only after victims have been exposed to sufficient concentrations over a long time.

This may be a conservative value due to the lack of relevant acute toxicity data for workers exposed to concentrations above 220 ppm.

The airways are exposed to high concentrations of organic dust created by some form of disturbance or mechanical process.

They were exposed to different concentrations of sulfotep.