But measuring chemicals and biological substances like hormones and micro-organisms has usually entailed a complex procedure, often with sophisticated equipment like gas chromatographs or mass spectrometers.

Your doctor may do tests to measure certain chemicals produced by the liver.

Pharmaceuticals, electronic components and accessories, aircraft and parts, scientific instruments, measuring and controlling instruments, radio and TV equipment, industrial chemicals, engines, turbines, machinery, and communications equipment.

Environmental Test Methods and Guidelines: EPA has prepared a number of guidelines for measuring chemicals in the environment and for testing the effects that chemicals can cause.

He recently completed two experiments to measure ozone-depleting chemicals on the Trans-Siberian Railway.

Flasks can be used to make and hold solutions, to measure chemicals, and to contain chemical reactions like boiling, precipitation and analysis.

It also measured atmospheric chemicals including hydrochloric acid, hydrofluoric acid, bromine, and iodine.

Federal scientists have begun a three-year effort to measure the sediment and chemicals in the Mississippi River to determine sources and levels of contamination.

She slipped them on and watched as Gary began measuring chemicals.

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