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RECORD NUMBER: 23 OF 1503

OLS Field Name OLS Field Data
Main Title Adaptation to and Biodegradation of Xenobiotic Compounds by Microbial Communities from a Pristine Aquifer.
Author Aelion, C. M. ; Swindoll, C. M. ; Pfaender, F. K. ;
CORP Author North Carolina Univ. at Chapel Hill. Dept. of Environmental Sciences and Engineering.;Robert S. Kerr Environmental Research Lab., Ada, OK.
Year Published 1987
Report Number EPA/600/J-87/208;
Stock Number PB88-170584
Additional Subjects Aquifers ; Reprints ; Biodegradation ; Xenobiotic compounds ; Pristine aquifers
Holdings
Library Call Number Additional Info Location Last
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Status
NTIS  PB88-170584 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/21/1988
Collation 8p
Abstract
The ability of subsurface microbial communities to adapt to the biodegradation of xenobiotic compounds was examined in aquifer solids samples from a pristine aquifer. An increase in the rates of mineralization of radiolabeled substrates with exposure was used as an indication of adaptation. For some compounds, such as chlorobenzene and 1,2,4-trichlorobenzene, slight mineralization was observed but no adaptation was apparent during incubations of over 8 months. Other compounds demonstrated three patterns of response. For m-cresol, m-aminophenol, and aniline intermediate rates of biodegradation and a linear increase in the percent mineralized with time were observed. Phenol, p-chlorophenol, and ethylene dibromide were rapidly metabolized initially, with a nonlinear increase in the percent mineralized with time, indicating that the community was alreody adapted to the biodegradation of these compounds. Only p-nitrophenol demonstrated a typical adaptation response. In different samples of soil from the same layer in the aquifer, the adaptation period to p-nitrophenol varied from a few days to as long as 6 weeks.