No one even knew from what substance they had been contrived.

From the standpoint of wit, rather than substance, it is a good week.

There are many circumstances where employees, or the environment, may be at risk from hazardous substances.

The idea was to put more power in the hands of the communities to deal directly with threats from hazardous substances.

Humans require a way to distinguish safe food from dangerous substances.

But now a new and diverse category of drugs is being developed from substances the body itself makes in minute amounts.

However, new technologies are being developed to make plastic from biological substances like corn oil.

Human beings and other animals make proteins from substances in the foods they eat.

Rather, the more common concern is the risk of accidental poisoning from everyday substances and products.

These can be used to minimise the risks from hazardous substances.