Iron, particularly "cold iron", was employed as a protective substance or charm against faeries.

It exudes protective substances which inhibit settlement of larvae.

Some evergreens are not just satisfied to produce food through photosynthesis; they also make a protective blue, waxy substance.

Exposure to protective or harmful substances soon after birth may be particularly critical.

He developed a system of anti-typhoid fever inoculation and a method of measuring protective substances (opsonin) in human blood.

The protective substances in saliva may be "one of the mechanisms by which the body protects itself," Dr. Fox said.

An autoimmune disease, MS impairs the nervous system by damaging the myelin sheath, a protective substance that surrounds nerve fibers.

It is a compatible solute which serves as a protective substance by acting as an osmolyte and thus helps organisms survive extreme osmotic stress.

Comparatively, silicone is a more protective and stronger substance which cannot be penetrated by liquids (unless they are corrosive alcohol), such as oil and water.

In 1890 he described alexins, or "protective substances", which exist in the serum and other bodily fluid and are capable of killing microorganisms.