11. Kinetic fractionation will cause the isotope ratios to vary between localities within that area. 12. Sediments at the site were originally carbon isotope ratios . 13. ;Ptolemy : An instrument measuring stable isotope ratios of key volatiles on the comet's nucleus. 14. An increased / isotope ratio in a parent compound thus provides direct evidence of degradation. 15. Also a study involving stable isotope ratios might include the molecule 18 O 16 O. 16. Different photosynthesis pathways can be identified by carbon isotope ratios , Evershed said in an interview. 17. Isotope ratios are typical of Central Volcanic Zone volcanoes.18. Hosler said, " because Ecuadorian and Mexican ores are very different in their isotope ratios . 19. The games'doping control center will use a carbon isotope ratio mass spectrometer, said Torpong Sewatarmra. 20. Chondrite meteorites are classified using the oxygen isotope ratios .
