chemical

A drug is a chemical substance.

The supervisor of the laboratory is beginning to get headaches and dizzy spells because she says it's dangerous to breathe some of the chemical smoke there.

Muscle performance can also be affected by a phenomenon called "central fatigue", in which an imbalance in the body's chemical messengers prevents the central nervous system from directing muscle movements effectively.

It will drive producers of chemical fertilizers out of business.

In cases where sewage mud is used, expensive chemical fertilizer use can be avoided.

Way up north in the Canadian Arctic, seabirds are picking up dangerous chemicals in the ocean and delivering them to ponds near where the birds live.

The bodies of fish and other meat eaters can build up high levels of the chemicals.

Salmon also carry dangerous chemicals as the fish migrate between rivers and the sea.

People who live, hunt or fish near bird coloniesneed to be careful, the researchers say, The birds don’t mean to cause harm, but the chemicals they carry can cause major problems.

We can tear apart the great grass cover of the western plains and pour toxic chemicals into the soil until the soil is dead and blows away in the wind.

Chemical testing showed that over the two years before her death, she moved about every two months.

Heating this chemical compound drives off carbon dioxide gas, leaving calcium oxide.

The chemical composition of rainfall changes slightly as rain clouds move.

The method relies on measuring how chemical variations in drinking water show up in people's hair.

Although we may not be aware of chemicals like pheromones consciously, we give and receive loads of information through smell in every interaction with other people.

But she expects using the chemical in some kind of industrial process-not simply "millions of worms thrown on top of the plastic".

Changing levels of body chemicals called hormones not only make teenagers' bodies develop adult characteristics, but also make it hard for teenagers to fall asleep before 11 pm.

Her popular 1962 book Silent Spring raised awareness of the dangers of pollution and the harmful effects of chemicals on humans and on the world's lakes and oceans.

Hormones are chemicals which are produced by the body to control various body functions.

In contrast, humans do not seem to be as gifted as other animals at detecting such chemicals.

In study after study, it appears that these chemical conversations help the neighbors.

Many animals give off pheromones — natural chemicals that can be detected by, and then can produce a response in, other animals of the same species.

Other experts say part of the problem is chemical.

So condors with high levels of lead are sent to Los Angeles zoo, where they are treated with calcium edta, a chemical that removes lead from the blood over several days.

Some plants pump out smelly chemicals to keep insects away.

These chemicals come from the injured parts of the plant and seem to be an alarm.

They are affected by certain body chemicals.

What the plants pump through the air is a mixture of chemicals known as volatile organic compounds, vocs for short.

Where we use sound and sight to communicate, ants depend primarily on pheromone, chemicals sent out by individuals and smelled or tasted by fellow members of their colony.

95 knit miniskirt in all its 2,300-pius stores around the world, it must rely on low-wage overseas labor, order in volumes that strain natural resources, and use massive amounts of harmful chemicals.