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Oxygen

From Bioblast


high-resolution terminology - matching measurements at high-resolution


Oxygen

Description

Dioxygen

Molecular oxygen, O2 or dioxygen, has two atoms of oxygen, O, which is the chemical element with atomic number 8. The relative molecular mass of O2, Mr,O2, is 32 (or 31.9988). By mass, the element oxygen is the third-most common element in the universe. At STP, molecular oxygen is a diatomic gas. The volume fraction of oxygen in dry clean air is constant at 0.20947 from sea level up to atmospheric altitude of 90 to 95 km. The partial pressure of oxygen, pr,O2, in air is a function of altitude and water vapor pressure. Oxygen gas is soluble in water at an oxygen solubility, SO2, that depends on temperature and the concentration and type of dissolved substances. Molecular oxygen is a substrate of cytochrome c oxidase (Complex IV) or alternative oxidases in aerobic cellular respiration.

Abbreviation: O2

Reference: Gnaiger 1983 POS symbols



MitoPedia topics: Substrate and metabolite