| 41. | There is a known variation in the isotopic abundance of chlorine-37.
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| 42. | Since it does not involve isotopic labeling, the results cannot be quantified.
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| 43. | This is particularly relevant when employing an isotopic label.
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| 44. | Isotopic labeling experiments are commonly considered to be a type of crossover experiment.
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| 45. | Future isotopic analysis of small, juvenile dinosaurs will better resolve this question.
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| 46. | This phenomenon is known as Natural Isotopic Fractionation ( see Figure 3 ).
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| 47. | Various subsequent processes then alter elemental and isotopic ratios.
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| 48. | Obviously ?M is depends on the precise isotopic composition for a given molecule.
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| 49. | Isotopic fractionation in the hydrologic cycle for more details]
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| 50. | Comets and terrestrial water have similar isotopic ratios.
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