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. 2015 Jul 28;6(4):e00767-15. doi: 10.1128/mBio.00767-15

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Copyright © 2015 Cowley et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution-Noncommercial-ShareAlike 3.0 Unported license, which permits unrestricted noncommercial use, distribution, and reproduction in any medium, provided the original author and source are credited.

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FIG 2 — Representative oxygen microprofiles. (A) STOX microprofile, with the sputum sample marked in tan, representative of n = 8. The green rectangle shows an expanded view of a portion of the anoxic zone in the sputum sample. The detection limit is 2 nM. (B) Oxygen microelectrode profiles of 5-mm-deep expectorated sputum samples from 5 different patients, representative of n = 12. At the air-sputum interface, a steep oxycline begins and is followed by an anoxic zone that persists for the remaining portion of the sputum. (C) Oxygen microelectrode profiles of 8-mm-deep expectorated sputum samples from 5 different patients that were larger in volume, representative of n = 27. The same trend in profile occurs, with a steep oxycline followed by anoxia.