| Library / English Dictionary |
OXYGEN
| Pronunciation (US): |  | (GB): | |
I. (noun)
Sense 1
Meaning:
A nonmetallic bivalent element that is normally a colorless odorless tasteless nonflammable diatomic gas; constitutes 21 percent of the atmosphere by volume; the most abundant element in the earth's crust
Synonyms:
Classified under:
Hypernyms ("oxygen" is a kind of...):
chemical element; element (any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter)
gas (a fluid in the gaseous state having neither independent shape nor volume and being able to expand indefinitely)
Hyponyms (each of the following is a kind of "oxygen"):
liquid oxygen; LOX (a bluish translucent magnetic liquid obtained by compressing gaseous oxygen and then cooling it below its boiling point; used as an oxidizer in rocket propellants)
Holonyms ("oxygen" is a substance of...):
air (a mixture of gases (especially oxygen) required for breathing; the stuff that the wind consists of)
H2O; water (binary compound that occurs at room temperature as a clear colorless odorless tasteless liquid; freezes into ice below 0 degrees centigrade and boils above 100 degrees centigrade; widely used as a solvent)
ozone (a colorless gas (O3) soluble in alkalis and cold water; a strong oxidizing agent; can be produced by electric discharge in oxygen or by the action of ultraviolet radiation on oxygen in the stratosphere (where it acts as a screen for ultraviolet radiation))
Derivation:
oxygenate; oxygenize (impregnate, combine, or supply with oxygen)
oxygenize (dehydrogenate with oxygen)
Context examples:
The rechargeable battery uses oxygen directly from the air, not stored, to yield high battery capacity.
(New, high-energy rechargeable batteries, NSF)
A parenteral oxacephem antibiotic with an oxygen molecule substituted for the sulfur atom in the beta-lactam nucleus.
(Moxalactam Disodium, NCI Thesaurus)
A chemical process that does not require oxygen or occurs in the absence of oxygen.
(Anaerobic, NCI Thesaurus)
Reactive oxygen species (ROS), produced within mitochondria, inhibit the function of EAAT2, the main glial glutamate transporter protein, responsible for most of the reuptake of synaptically released glutamate.
(Amyotrophic Lateral Sclerosis Pathway, NCI Thesaurus/KEGG)
This results in a dilatation of the main coronary and systemic arteries, decreased myocardial contractility, increased blood flow and oxygen delivery to the myocardial tissue, and decreased total peripheral resistance.
(Amlodipine, NCI Thesaurus)
A mathematic formula used to estimate individual oxygen consumption, and thus energy expenditure, at rest and for various physical activities.
(Metabolic Equivalent of Task, NCI Thesaurus)
Aminobenzoic acid may also increase oxygen uptake at the tissue level and may enhance monoamine oxidase (MAO) activity to promote the degradation of serotonin, which in excess, may lead to fibrotic changes.
(Aminobenzoic acid, NCI Thesaurus)
When the proper wavelength of light activates protoporphyrin IX, singlet oxygen is produced, resulting in a local cytotoxic effect.
(Aminolevulinic acid, NCI Thesaurus)
In addition, this agent inhibits alpha- and beta-adrenergic receptors, resulting in a reduction in sympathetic stimulation of the heart, a negative chronotropic effect, and a decrease in myocardial oxygen demands.
(Amiodarone, NCI Thesaurus)
Arginine is the only physiological substrate for NOS which, in eukaryotic cells, generates NO and L-citrulline from L-arginine and molecular oxygen in a five-electron transfer reaction.
(Amino-Arginine, NCI Thesaurus)
