Another group of substances, called growth factors, possess hormonelike activity.
Amphetamine-type stimulants - including ecstasy - remain the second-most widely consumed group of substances, it says.
Prodrugs are a wide group of substances of low or no pharmacological activity.
Radionuclides are a special group of substances posing both radiological and chemical hazards to organisms.
Astringent, any of a group of substances that cause the contraction or shrinkage of tissues and that dry up secretions.
During infection, an intricate network of cytokines, a group of substances closely related to disease severity, is released.
Butadiene (Figure 3) is used to produce plastics and elastomers, a group of substances related to plastics.
It examined levels of epicatechin, the antioxidant compound, one of a group of substances found in food known as flavonoids that have been linked to better cardiac health.
An enzyme will interact with only one type of substance or group of substances, called the substrate, to catalyze a certain kind of reaction.
The basic idea of this so-called "group model" is that mixtures can be classified into group of substances with thermophysically similar behaviour.
The cloud, officials said, was one of a group of substances called mercaptans, foul-smelling but largelyharmless chemicals — at low doses, at any rate.
