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.