His constitution makes him prone to catching colds.

He has a susceptibility to depression, and tends to get down over little things.

He has cyclothymia, and his mood changes drastically.

The aerosol in this area is very dense.

That dog is reputed to be vicious.

This wall is made of chalky material.

Protein is a nutrient necessary for muscle growth.

The white matter in the brain plays a role in transmitting signals of nerve cells.

This substance has the properties of a crystalloid.

The properties of electrolytes are one of the important themes in physical chemistry.