PCHM

This, in effect, has a direct bearing on fertility and there is evidence that birth abnormalities, like undescended testicles, might be caused by exposure to DDT and similar persistent chemicals. And there is no doubt that DDT is carcinogenic, it causes cancers.

The vulnerability analysis reveals that the enemy has persistent chemical agents that can be delivered to the APOD by rockets or terrorists.

* Smoke tubes are similar in appearance to sorbent sample tubes, but they generate a persistent chemical smoke when air is pushed through them with a small aspirator bulb.

Timing is more of a problem for a persistent chemical with a long half-life than for a nonpersistent chemical.

That and their resistance to degradation combine to create a persistent chemical that bioaccumulates.

Persistent chemicals get magnified throughout the food chain and have been detected in products ranging from meat, poultry and fish, to vegetable oils, nuts and various fruits and vegetables.

A multi-individual pharmacokinetic model framework for interpreting time trends of persistent chemicals in human populations: application to a postban situation.

No use of chemical synthetic pesticides, persistent chemicals and fertilisers.

Mr Strachan said: "With improved water quality, growing fish stocks, the removal of pesticides in sheep dip and persistent chemicals on crops that can take 30 years to biodegrade, our latest survey shows that nearly 90% of these sites now have otters."

Persistent chemicals in the environment enter our bodies from mattresses, sofas and essential electrical goods in the home.

It's true that persistent chemicals like mercury and polychlorinated biphenyls (PCBs) stow away in our fat cells.