The laboratory was shut down after inspectors discovered an unregistered controlled substance stored without proper documentation.

During the inflammatory response, substance P is released from sensory neurons and amplifies pain signaling.

In determining the constitutionality of the statute, the court focused on the pith and substance of the law rather than its incidental effects.

When minnows detected the alarm substances, they swam to deeper water and formed a tighter shoal.

To determine the amount of substance in the sample, the chemist measured the number of moles of the solute present.

Substance-wise, the new policy offers little improvement over the old one.

The laboratory confirmed that the sample was an elementary substance composed solely of hydrogen molecules.

Scientists detected trace amounts of a polyfluoroalkyl substance in the river sediment.

Researchers are studying how polyfluoroalkyl substances accumulate in marine food webs.

Researchers are investigating how perfluoroalkyl substances accumulate in the food chain.