| 11. | For example, the carbon isotopic composition of carbonatites is mantle-like and not like sedimentary limestone.
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| 12. | Variations in isotopic composition of extraterrestrial materials stem from planetary interplanetary dust particles and cometary volatiles.
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| 13. | By studying SEP's isotopic composition, scientists can indirectly measure the material that formed the solar system.
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| 14. | But, he added, " The question of carbon isotopic composition is something of a mystery ."
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| 15. | View of a slice of the Meteorite EETA 79001, showing dark glass inclusions containing distinct isotopic compositions.
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| 16. | According to the IsoRes hypothesis, there are certain resonance isotopic compositions at which terrestrial organisms thrive best.
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| 17. | The experiment was successful and provided accurate He, Ne and Ar isotopic compositions of the solar wind.
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| 18. | Also important are their extreme isotopic compositions, which are expected to exist nowhere in the interstellar medium.
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| 19. | The first measurements used spheres of silicon with natural isotopic composition, and had a relative uncertainty of 3.1.
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| 20. | Hydrogen Minerals generally have large isotope effects, and the isotopic composition often follows the pattern observed for precipitation.
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