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Science 8 July 1977:
Vol. 197. no. 4299, pp. 161 - 163
DOI: 10.1126/science.877545
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Articles

Science, Vol 197, Issue 4299, 161-163
Copyright © 1977 by American Association for the Advancement of Science

articles

Ammonia in the human airways: neutralization of inspired acid sulfate aerosols

TV Larson, DS Covert, R Frank, and RJ Charlson

In the human being, expired ammonia concentrations from 7 to 520 micrograms per cubic meter are controlled by the last airway segment traversed by the air, and such concentrations are higher in the mouth than nose. Inspired submicrometric sulfuric acid aerosol at a mass concentration of 600 +/- 100 micrograms per cubic meter was found to be an ammonium salt with an average ammonium to sulfate molar ratio of greater than or equal to 1, when sampled within 0.5 second after exhalation.


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Apparent respiratory discrimination is correlated with growth rate in the shoot apex of sunflower (Helianthus annuus).
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J. Exp. Bot. 55, 2599-2605
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Dilution of Respiratory Solutes in Exhaled Condensates.
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Am. J. Respir. Crit. Care Med. 165, 663-669
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Expression and Activity of pH-regulatory Glutaminase in the Human Airway Epithelium.
J. F. HUNT, E. ERWIN, L. PALMER, J. VAUGHAN, N. MALHOTRA, T. A. E. PLATTS-MILLS, and B. GASTON (2002)
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