Full TGIF Record # 72272
Item 1 of 1
Author(s):Hines, Mark E.; Crill, Patrick M.; Varner, Ruth K.; Talbot, Robert W.; Shorter, Joanne H.; Kolb, Charles E.; Harriss, Robert C.
Author Affiliation:Hines, Crill, Varner, Talbot, and Harriss: Institute for the Study of Earth, Oceans, and Space, University of New Hampshire, Durham, New Hampshire; and Kolb and Shorter: Center for Chemical and Environmental Physics, Aerodyne Research Inc., Billerica, Massachusetts
Title:Rapid consumption of low concentrations of methyl bromide by soil bacteria
Section:General microbial ecology
Other records with the "General microbial ecology" Section
Source:Applied and Environmental Microbiology. Vol. 64, No. 5, May 1998, p. 1864-1870.
Publishing Information:Washington, D.C.: American Society for Microbiology
# of Pages:7
Keywords:TIC Keywords: Methyl bromide; Bacteria; Dilution; Uptake; Remediation; Temperatures; Soil moisture; Mixtures; Ratios
Abstract/Contents:"A dynamic dilution system for producing low mixing ratios of methyl bromide (MeBr) and a sensitive analytical technique were used to study the uptake of MeBr by various soils. MeBr was removed within minutes from vials incubated with soils and ~ 10 parts per billion by volume of MeBr. Killed controls did not consume MeBr, and a mixture of the broad-spectrum antibiotics chloramphenicol and tetracycline inhibited MeBr uptake by 98%, indicating that all of the uptake of MeBr was biological and by bacteria. Temperature optima for MeBr uptake suggested a biological sink, yet soil moisture and temperature optima varied for different soils, implying that MeBr consumption activity by soil bacteria is diverse. The eucaryotic antibiotic cycloheximide had no effect on MeBr uptake, indicating that soil fungi were not involved in MeBr removal. MeBr consumption did not occur anaerobically. A dynamic flowthrough vial system was used to incubate soils at MeBr mixing ratios as low as those found in the remote atmosphere (5 to 15 parts per trillion by volume [pptv]). Soils consumed MeBr at all mixing ratios tested. Temperate forest and grassy lawn soils consumed MeBr most rapidly (rate constant [k] = 0.5 min-1), yet sandy temperate, boreal, and tropical forest soils also readily consumed MeBr. Amendments of CH4 up to 5% had no effect on MeBr uptake even at CH4:MeBr ratios of 107, and depth profiles of MeBr and CH4 consumption exhibited very different vertical rate optima, suggesting that methanotrophic bacteria, like those presently in culture, do not utilize MeBr when it is at atmospheric mixing ratios. Data acquired with gas flux chambers in the field demonstrated the very rapid in situ consumption of MeBr by soils. Uptake of MeBr at mixing ratios found in the remote atmosphere occurs via aerobic bacterial activity, displays first-order kinetics at mixing ratios from 5 pptv to ~1 part per million per volume, and is rapid enough to account for 25% of the global annual loss of atmospheric MeBr."
Language:English
References:28
See Also:Other items relating to: MEBR
Note:Graphs
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Hines, M. E., P. M. Crill, R. K. Varner, R. W. Talbot, J. H. Shorter, C. E. Kolb, et al. 1998. Rapid consumption of low concentrations of methyl bromide by soil bacteria. Appl. Environ. Microbiol. 64(5):p. 1864-1870.
Fastlink to access this record outside TGIF: https://tic.msu.edu/tgif/flink?recno=72272
If there are problems with this record, send us feedback about record 72272.
Choices for finding the above item:
Find Item @ MSU
MSU catalog number: QR 1 .A6
Request through your local library's inter-library loan service (bring or send a copy of this TGIF record)