<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Del Rio, L. F.</style></author><author><style face="normal" font="default" size="100%">Hadwin, A. K. M.</style></author><author><style face="normal" font="default" size="100%">Pinto, L. J.</style></author><author><style face="normal" font="default" size="100%">MacKinnon, M. D.</style></author><author><style face="normal" font="default" size="100%">Moore, M. M.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Degradation of naphthenic acids by sediment micro-organisms</style></title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Biodegradation</style></keyword><keyword><style  face="normal" font="default" size="100%">bioremediation</style></keyword><keyword><style  face="normal" font="default" size="100%">microbiology</style></keyword><keyword><style  face="normal" font="default" size="100%">naphthenic acids</style></keyword><keyword><style  face="normal" font="default" size="100%">sediment</style></keyword><keyword><style  face="normal" font="default" size="100%">Syncrude</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2006</style></year><pub-dates><date><style  face="normal" font="default" size="100%">03/2006</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://onlinelibrary.wiley.com/doi/10.1111/j.1365-2672.2006.03005.x/pdf</style></url></web-urls></urls><publisher><style face="normal" font="default" size="100%">Journal of Applied Microbiology </style></publisher><volume><style face="normal" font="default" size="100%">101</style></volume><pages><style face="normal" font="default" size="100%">12 pages </style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Naphthenic acids (NAs) are naturally occurring, linear and cyclic carb- oxylic surfactants associated with the acidic fraction of petroleum. NAs account for most of the acute aquatic toxicity of oil sands process-affected water (OSPW). The toxicity of OSPW can be reduced by microbial degradation. The aim of this research was to determine the extent of NA degradation by sedi- ment microbial communities exposed to varying amounts of OSPW.
Methods and Results: Eleven wetlands, both natural and process-affected, and one tailings settling pond in Northern Alberta were studied. The natural wet- lands and process-affected sites fell into two distinct groups based on their water chemistry. The extent of degradation of a 14C-labelled monocyclic NA surrogate [14C-cyclohexane carboxylic acid (CCA)] was relatively uniform in all sediments (approximately 30%) after 14 days. In contrast, degradation of a bicyclic NA surrogate [14C-decahydronaphthoic acid (DHNA)]was significantly lower in non process-affected sediments. Enrichment cultures, obtained from an active tailings settling pond, using commercially available NAs as the sole carbon source, resulted in the isolation of a co-culture containing Pseudomonas putida and Pseudomonas fluorescens. Quantitative GC–MS analysis showed that the co-culture removed &gt;95% of the commercial NAs, and partially degraded the process NAs from OSPW with a resulting NA profile similar to that from ‘aged wetlands’.
</style></abstract><issue><style face="normal" font="default" size="100%">5</style></issue><custom2><style face="normal" font="default" size="100%">Athabasca Oil Sands Region (AOSR)</style></custom2><custom3><style face="normal" font="default" size="100%">http://www.worldcat.org/oclc/5156122537</style></custom3><custom4><style face="normal" font="default" size="100%">OSEMB</style></custom4></record></records></xml>