Monitors have been installed around the city to measure for airborne radiological, chemical or biological substances.

Many biological substances, for example proteins, easily create foam on agitation and/or aeration.

How difficult could it be to mix two biological substances that should have a natural affinity?

Many veterans participated in performance or equipment tests that did not involve biological or chemical substances.

Heparin is a biological substance, usually made from pig intestines.

These neutrons have proved to be particularly valuable in materials research and in the investigation of biological substances.

The artificial life form created out of biological substances was confused by Keklos' sharp reproaches.

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

Contaminants are any physical, chemical, biological or radiological substances or matter in water.

Among common biological substances, all of the simple carbohydrates are sweet to at least some degree.