![]() ![]() Moreover, practical experience shows-and theoretical considerations confirm-that the bioavailability of extremely hydrophobic contaminants may be too low to build up and maintain the microbial population sizes that would be needed to clean soil in a reasonable time ( 6). There is evidence, however, that growth of heterotrophic microbes in terrestrial ecosystems is often restricted by the availability of nutrients or organic carbon (for a review see reference 8). Feeding of supplementary carbon substrates may therefore promote bioremediation, provided that it sustains the pollutant-degrading population rather than other members of the microbial community.Įngineered soil bioremediation aims at stimulating biodegradation by promoting the creation and maintenance of an active, pollutant-degrading microbial community. The capability of polycyclic aromatic hydrocarbon (PAH)-degrading bacteria to utilize readily available substrates besides the poorly available PAHs favors the buildup of PAH-degrading biomass. Higher proportions of anthracene in the carbon source mixture led to higher cell surface hydrophobicities and more-hydrophobic mycolic acids, which in turn appeared to be valuable indicators for substrate utilization by M. frederiksbergense LB501T depended on the carbon source and the various rates of addition of mixed substrates, whereas no such trend was observed with GLFA. The relative ratios of straight-chain saturated PLFA to the corresponding unsaturated PLFA and the total fraction of saturated cyclopropyl-branched PLFA of M. frederiksbergense LB501T degrades anthracene and forms biomass from it even in the presence of more readily available dissolved glucose. ![]() Moreover, the influence of mixed-substrate utilization on PLFA, GLFA, and mycolic acid profiles and cell surface hydrophobicity was investigated. The distinct 13C contents of anthracene and glucose as representatives of typical hydrophobic pollutants and naturally occurring organic compounds, respectively, were monitored during formation into biomass and used to quantify the relative contributions of the two carbon sources to biomass formation. Only eight defensemen have won the award three times since the trophy was first handed out after the 1953-54 season.Stable carbon isotope analysis of biomass and analyses of phospholipid fatty acids (PLFA), glycolipid fatty acids (GLFA), and mycolic acids were used to characterize mixed-substrate utilization by Mycobacterium frederiksbergense LB501T under various substrate regimens. This is the fifth time in Karlsson’s 14-year NHL career that he has been named a Norris finalist, as he won the award in 20. The NHL Awards show is on June 26 in Nashville. Makar won the award last season and Fox was the winner in 2021 under Sharks coach David Quinn. Karlsson also averaged 25:37 in ice time per game to lead the Sharks as he played a full 82-game for the first time since 2015-16 when he was with the Ottawa Senators.Īlso voted as finalists for the Norris by members of the Professional Hockey Writers’ Association were Cale Makar of the Colorado Avalanche and the New York Rangers’ Adam Fox. Karlsson, in his fifth full season with the San Jose Sharks, had 25 goals and 76 assists, both career-highs, as he became the first NHL defenseman in 31 years to record more than 100 points in a season. After a record-setting 101-point season, Erik Karlsson, as expected, was named a finalist for the Norris Trophy as the NHL’s best defenseman on Thursday.
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