18O

18O

Symbol for oxygen 18.
References in periodicals archive ?
The isotope composition, in the case of oxygen, is measured as the ratio between two forms of oxygen: the common isotope, oxygen 16 (16O) and its rare, heavy form, oxygen 18 (18O).
Stable isotope studies indicate less depleted I' 18O values for Dol-I (i.e., -6.44 to -3.76adeg V-PDB), slightly depleted I' 18O values for Dol-II (-7.73 to -5.24adeg V-PDB), and more depleted I' 18O values for Dol-III (-7.29 to -7.20adeg V-PDB) respectively.
18o, p) is composed of a layer up to 0.5 mm thick of periclinal, horizontally arranged fibers (or tangentially elongate sclereids sensu Wannan and Quinn (1990)).
The TLX Cargo 15[degrees]-25 o C blankets freeze at around 18o C (i.e.
Typically, exclusively breast-fed infants have higher [delta][.sup.18]O values and lower [delta][.sup.13]C values relative to weanlings, since breast milk is isotopically enriched in 18O and depleted in [.sup.13]C (Wright and Schwarz 1998).
Kowal, "Anharmonic vibrational spectra of hydroxylamine and its 15N, 18O, and deuterium substituted analogs," Spectrochimica Acta--Part A Molecular and Biomolecular Spectroscopy, vol.
Forster II, "Comparison of 18O exchange and pH stop-flow assays for carbonic anhydrase," Journal of Applied Physiology, vol.
Du et al., "Hydrochemical and isotopic (2H, 18O and 37Cl) constraints on evolution of geothermal water in coastal plain of Southwestern Guangdong Province, China," Journal of Volcanology and Geothermal Research, vol.
Jordan et al., "Vehicle emissions of greenhouse gases and related tracers from a tunnel study: CO : CO2, N2O : CH4 : O2 : Atios, and the stable isotopes 13C and 18O in CO2 and CO," Atmospheric Chemistry and Physics, vol.