They have sought to acquire nuclear and chemical materials for use as terrorist weapons.

From the early 1990's, Osama bin Laden has sought to obtain nuclear and chemical materials for use as weapons of terror.

It is used to study the structure and composition of biological, chemical and physical materials.

The Microwave chemistry sensor can detect several chemical materials including:

These are chemical materials, so are not usually appropriate for organic pest management strategies.

Papers and chemical materials were on all the shelves that lined all three walls.

Many of the first articles on the Persian Wikipedia were about chemical materials and historical subjects.

Several times in the last decade, individuals or groups have attempted to steal and then sell nuclear, chemical or biological materials from sites in Russia.

"These encounters conveyed a sense of intimacy with one's chemical materials," he wrote.

Another goal: to hamper Chinese sale of nuclear, chemical and cruise-missile material and technology.