Scientists have worked for years to isolate the key chemicals for increasing or decreasing the amount of telomerase in cells.

Lou finally discovers the key chemical that makes her solar cell work.

A key chemical in communication between synapses is acetylcholine, a type of chemical called a neurotransmitter.

Before refrigeration was available salt was a key chemical used in preserving vegetables, meat, and fish.

The first apparent success with the procedure, which scientists believe helps restore the brain's ability to produce a key chemical, had previously been reported from Mexico.

Dopamine is one of the key chemicals that controls the reward circuits of the brain.

Core research provides information about underlying key biological, chemical, and physical processes that can be used to solve real-world environmental problems.

He can even induce dreams by injecting the controlling neurons with a key chemical, acetylcholine.

The drug may slow the breakdown of a key chemical in the brain, acetylcholine, which seems to be involved in memory.

Then the researchers measured key chemicals associated with premature aging of the skin due to sun damage.