Each crude oil type has unique molecular, chemical characteristics.

So scientists try to decide safety based on the physical and chemical characteristics of the protein.

Proteins determine the physical and chemical characteristics of cells and therefore organisms.

Although lead is a known poison, the mechanical and chemical characteristics of the metal continue to keep lead as an important component in many products.

In adult development, aging is regarded as a change in physical and chemical characteristics over a period of time.

By now, we should have a detailed description of the genetic makeup of each sample along with physical and chemical characteristics.

But Cry9C has some physical and chemical characteristics of food allergens.

Gases vary widely in their physical and chemical characteristics.

Operation: is to change the physical or chemical characteristics of the material.

The molecular structure of the alkanes directly affects their physical and chemical characteristics.