| 11. | In the presence of sunlight, the nitrogen compounds produce ozone.
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| 12. | On the way down, the first problem is nitrogen narcosis.
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| 13. | Cellular DNA stored in liquid nitrogen has been regrown after decades.
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| 14. | The nitrogen oxide _ NOx _ is invisible at its source.
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| 15. | In cancer chemotherapy, the first effective drug was nitrogen mustard.
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| 16. | But nitrogen oxides are not the only concern, Carman said.
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| 17. | That could be reduced to about 2 percent with nitrogen inerting.
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| 18. | In its everyday gaseous form, nitrogen atoms bond in pairs.
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| 19. | It has a nitrogen atmosphere thicker than the Earth's.
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| 20. | I usually add phosphorus and bloodmeal to avoid a nitrogen overload.
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