| 21. | The " fingerprint " of oxygen-isotope ratios inside the Antarctic rock resembles other apparent Martian rocks.
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| 22. | Oxygen isotope ratios are measured relative the standard, V-SMOW ( Vienna Standard Mean Ocean Water ).
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| 23. | Along with the neodymium isotope ratios this suggests that Panizos magmas have a strong crustal component.
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| 24. | An analysis of carbon isotope ratios indicated that neither person was subsisting on corn, he said.
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| 25. | Oxygen isotope ratios are not perfect proxies, however.
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| 26. | In freshwater environments, examining Sr87 / Sr86 isotope ratios is often employed to provide greater spatial resolution.
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| 27. | This spectrometer is adjusted to measure particularly the isotope ratios for oxygen, carbon, nitrogen, and heavier gases.
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| 28. | This normally involves isotope ratio mass spectrometry.
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| 29. | Strontium isotope ratios of the leucogranite intrusives are distinct from that of the gneiss and associated leucosomes.
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| 30. | Recently advanced high resolution gas source isotope ratio mass spectrometers can measure hydrogen isotopes of organic molecules directly.
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