1. The continent's natural abundance and human poverty simply raise the stakes. 2. The town was named for the natural abundance of ivy. 3. Its natural abundance is in the range of 10-52 ppm. 4. The natural abundance of furs had passed and it could no longer meet market demand. 5. The masses listed are based on weighted averages of the elemental isotopes at their natural abundances . 6. In these materials, deviations from " natural abundance " are sometimes measured in factors of 100. 7. The surrounding forest still maintains its natural abundance . 8. This last characteristic makes possible the study of samples with the natural abundance of the M�ssbauer isotope. 9. In contrast, carbon and nitrogen have useful isotopes but which occur only in very low natural abundance . 10. Recent advances in analytical instruments enable direct measurement of natural abundance D / H ratios in organic molecules.
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