superoxide
Definition
Noun: 1. The univalent anion O₂⁻: A highly reactive, oxygen-containing chemical species (anion) formed when molecular oxygen (O₂) gains one extra electron. 2. A metallic oxide containing the univalent anion O₂⁻: A compound formed between a metal and the superoxide anion, such as potassium superoxide (KO₂).
Usage and Examples
- As a reactive chemical species:
- Superoxide is a type of free radical produced during normal cellular metabolism.
- Antioxidant enzymes like superoxide dismutase work to neutralize harmful superoxide.
- As a metallic compound:
- Potassium superoxide is used in rebreathers for space and underwater exploration because it releases oxygen.
- The formation of a superoxide is common with alkali metals like sodium and potassium.
Advanced Usage
- Superoxide Dismutase (SOD): This is the name of a specific enzyme family whose primary function is to catalyze the breakdown of the superoxide anion into oxygen and hydrogen peroxide. The term "superoxide" is integral to the enzyme's name and function.
- Superoxide Radical: This is a more precise term emphasizing the reactive, free-radical nature of the O₂⁻ anion.
Variants and Related Words
- Superoxide Dismutase (n): An important antioxidant enzyme.
- Peroxide (n): A related anion with the formula O₂²⁻ (e.g., hydrogen peroxide, H₂O₂).
- Oxide (n): A more general term for a compound of oxygen with another element.
Synonyms and Near Equivalents
- Dioxide (n): . Refers to a compound containing two oxygen atoms (e.g., carbon dioxide, CO₂).
- Free radical (n): A broader category of highly reactive molecules with unpaired electrons, which includes the superoxide anion.
- Reactive oxygen species (ROS) (n): A collective term for chemically reactive molecules containing oxygen, such as superoxide, hydrogen peroxide, and hydroxyl radicals.
Related Phrases and Concepts
- Oxidative stress: A biological state where the production of reactive molecules like overwhelms the body's antioxidant defenses.
- To generate/produce superoxide: Describes the formation of this anion in biological or chemical systems.
- To scavenge/quench superoxide: Describes the action of neutralizing or removing the superoxide anion.
Noun
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the univalent anion O2-
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much of the O2 supporting cellular respiration is reduced to the superoxide anion O2-
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a metallic oxide containing the univalent anion O2-
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