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oxygen-18

   Also found in: Wikipedia 0.01 sec.
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.
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By comparing the Oxygen-18 content in all of the annual layers from the four drillings through the ice sheet with the Oxygen-18 content of the same annual layers in the small ice caps, Bo Vinther has calculated the elevation course through 11,700 years.
Scientists map melting history of Greenland's ice sheet by Asian News International
As data from previous field tests had hinted, the ratio of oxygen-16 and oxygen-18 isotopes in the plant-produced silica varied according to the temperature, Huang said.
Phytoliths as climate clues by Perkins, Sid / Science News
One new method is the doubly labeled water technique, a form of indirect calorimetry based on the elimination of deuterium and oxygen-18 from urine.
New information challenges the set point theory of obesity: weight ... by Clinical Psychiatry News
 
 
 
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