Lukas karlson6/27/2023 ![]() 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. This report by The Canadian Press was first published May 4, 2023.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. The winner will be revealed during the NHL awards show on June 26. The 24-year-old becomes the fourth player in NHL history to be named a Norris Trophy finalist at least three times in their first four campaigns, joining Bobby Orr, Brad Park and Denis Potvin.įox, who won the award in 2020-21, had 12 goals and 60 assists in 82 games this season. Makar, last year’s winner, had 17 goals and 49 assists in 60 games, ranking second among all defencemen in points per game. It’s also Karlsson’s fifth time being named a finalist. The 32-year-old Swede won the trophy in 2011-15 as a member of the Ottawa Senators. Karlsson was also the first to do so since Brian Leetch in 1991-92. Karlsson led all blueliners with a career-high 101 points this season and became the sixth defenceman in NHL history to break the 100-point plateau. NEW YORK - Erik Karlsson of the San Jose Sharks, Cale Makar of the Colorado Avalanche and Adam Fox of the New York Rangers are the three finalists for the Norris Trophy, awarded to the NHL’s best defenceman.
0 Comments
Leave a Reply. |