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Front Microbiol

Title:		Microbial acetone oxidation in coastal seawater
Author(s):		Dixon JL; Beale R; Sargeant SL; Tarran GA; Nightingale PD;
Address:		"Plymouth Marine Laboratory, Prospect Place Plymouth, UK"
Journal Title:		Front Microbiol
Year:		2014
Volume:		20140526
Issue:
Page Number:		243 -
DOI:		10.3389/fmicb.2014.00243
ISSN/ISBN:		1664-302X (Print) 1664-302X (Electronic) 1664-302X (Linking)
Abstract:		"Acetone is an important oxygenated volatile organic compound (OVOC) in the troposphere where it influences the oxidizing capacity of the atmosphere. However, the air-sea flux is not well quantified, in part due to a lack of knowledge regarding which processes control oceanic concentrations, and, specifically whether microbial oxidation to CO2 represents a significant loss process. We demonstrate that (14)C labeled acetone can be used to determine microbial oxidation to (14)CO2. Linear microbial rates of acetone oxidation to CO2 were observed for between 0.75-3.5 h at a seasonally eutrophic coastal station located in the western English Channel (L4). A kinetic experiment in summer at station L4 gave a V max of 4.1 pmol L(-1) h(-1), with a K m constant of 54 pM. We then used this technique to obtain microbial acetone loss rates ranging between 1.2 and 42 pmol L(-1) h(-1.)(monthly averages) over an annual cycle at L4, with maximum rates observed during winter months. The biological turnover time of acetone (in situ concentration divided by microbial oxidation rate) in surface waters varied from ~3 days in February 2011, when in situ concentrations were 3 +/- 1 nM, to >240 days in June 2011, when concentrations were more than twofold higher at 7.5 +/- 0.7 nM. These relatively low marine microbial acetone oxidation rates, when normalized to in situ concentrations, suggest that marine microbes preferentially utilize other OVOCs such as methanol and acetaldehyde"
Keywords:		Western English Channel (L4) acetone oxidation acetone turnover bacteria kinetics radioactive labeling seasonality;
Notes:		"PubMed-not-MEDLINEDixon, Joanna L Beale, Rachael Sargeant, Stephanie L Tarran, Glen A Nightingale, Philip D eng Switzerland 2014/06/07 Front Microbiol. 2014 May 26; 5:243. doi: 10.3389/fmicb.2014.00243. eCollection 2014"