Free Radicals

Highly reactive molecules with an unsatisfied electron valence pair. Free radicals are produced in both normal and pathological processes. Free radicals include reactive oxygen and nitrogen species (RONS). They are proven or suspected agents of tissue damage in a wide variety of circumstances including radiation, damage from environment chemicals, and aging. Natural and pharmacological prevention of free radical damage is being actively investigated.

Year introduced: 1976(1967)

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Tree Number(s): D01.339, D02.389

MeSH Unique ID: D005609

Entry Terms:

• Free Radical

Previous Indexing:

• Chemistry (1966)
• Chemistry, Physical (1966)
• Electron Spin Resonance (1966)

See Also:

• Free Radical Scavengers
• Spin Trapping

All MeSH Categories
Chemicals and Drugs Category
Inorganic Chemicals
Free Radicals
Reactive Nitrogen Species
Nitric Oxide
Peroxynitrous Acid
Reactive Oxygen Species
Artemisinins +
Hydroxyl Radical
Hypochlorous Acid
Peroxides +
Singlet Oxygen

All MeSH Categories
Chemicals and Drugs Category
Organic Chemicals
Free Radicals
Reactive Nitrogen Species
Nitric Oxide
Peroxynitrous Acid
Reactive Oxygen Species
Artemisinins +
Peroxides +
Singlet Oxygen
Spin Labels
Triacetoneamine-N-Oxyl