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. 2014 Jan 17;9(1):e84353. doi: 10.1371/journal.pone.0084353

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© 2014 Kolpen et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Depth specific plots of N₂O concentration vs. time at particular measuring depths in the same sputum sample as displayed in Fig 4. Accumulation and thus net production of N₂O in all depths was observed until approximately 6 h, followed by net consumption of N₂O presumably due to depletion of nitrate around 6 h.