oxygen-18


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oxygen-18

[′äk·sə·jən ā′tēn]
(nuclear physics)
Oxygen isotope with atomic weight 18; found 8 parts to 10,000 of oxygen-16 in water, air, and rocks; used in tracer experiments. Also known as heavy oxygen.
References in periodicals archive ?
The foraminifera form calcareous shells called tests in which the content of oxygen-18 depends on the temperature of the water in which they live.
De Wit and Furnes analyzed hundreds of rock samples for the concentration of oxygen-18 isotopes, an indicator of what the temperature was like when the rocks formed.
These are analyzed subsequently on Delta oxygen-18, Delta-2 is hydrogen and tritium.
The rain in hurricanes normally contains very small amounts of the Isotope oxygen-18 and an abundance of the lighter oxygen-16.
TAHRAN (CyHAN)- Iran inaugurated Oxygen-18 isotopes (18O) production unit at the Arak's 40-megawatt heavy water reactor on April 9.
Oxygen isotopes usually sort out according to mass: oxygen-17, with just one extra neutron, is incorporated into molecules half as often as oxygen-18, with two extra neutrons.
Because it varies with temperature, the oxygen-18 level rises and falls with the seasons.
The Asia-Pacific stable isotopes market is dominated by deuterium (D2), oxygen-18 (O-18), carbon-13 (C-13), and nitrogen-15 (N-15).
The relative abundances of oxygen-18 and carbon-13 are very sensitive to formation temperature.
Their topics include copper dioxygenases, energy conversion and conservation by cytochrome oxidases, the structure and reactivity of copper-oxygen species revealed by competitive oxygen-18 isotope effects, chemical reactivity in copper active-oxygen complexes, supramolecular copper dioxygen chemistry, and organic synthetic methods using copper oxygen chemistry.
15,16) If the paint system is exposed to UV light in an atmosphere of oxygen-18, then oxygen-18 labeled photooxidation products will be created.
Animals that live in the water, such as hippos and crocodiles, have different proportions of oxygen and oxygen-18 in their bones and teeth than animals that live on land.