This technique can detect even tiny amounts of a virus's genetic material.

Until then, scientists had not detected significant amounts of volcanic gases.

The test, which was developed in Australia, can detect even smaller amounts of another person's blood cells in a sample.

Home test kits cannot detect small amounts of lead under some conditions.

These detectors are extremely sensitive and can detect minute amounts of radioactive materials.

Later, they detected large amounts of background radiation in the universe, coming from every direction.

Hand-held devices are available that can detect small amounts of sarin.

"We are confident that it can detect amounts of explosives that would pose a threat to aviation."

The investigators were able to detect small amounts of radiation coming from the nuclear power facility.

Air monitoring by federal officials since Sept. 11 has at times detected small amounts of the substance, evidence that some tanks ruptured or were damaged.