Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. A mixture of nine polychlorinated biphenyl (PCB) congeners with four to six chlorine substituents was cometabolized in an aerobic chemostat culture of Alcaligenes sp. JB1, grown on 3-methylbenzoate. Pseudo-first-order biodegradation rate constants (kb) were calculated using a steady-state kinetic model. These rate constants varied from 7.8 to 0.44 h-'. Comparable resultsfor exposure to high and low influent concentrations confirmed the assumption of pseudofirst-order kinetics for most of the congeners studied. Alcaligenessp. JB1 was found to degrade 2,3-dichlorophenyl rings very rapidly and 2,5-dichlorophenyl rings relatively slowly. Certain penta-and hexachlorobiphenyls were degraded faster than some tetrachlorobiphenyls. For example, 2,2' ,3,3' ,6,6' -hexachlorobiphenyl was degraded faster than 2,2' ,6,6' -tetrachlorobiphenyl. On the other hand, 2,2',3,3',4,4'-HCB was degraded much more slowly than 2,2',3,3'-TCB. A control experiment with Pseudomonas fluorescens NCTC10038, a bacterium incapable of PCB (co)metabolism, showed that losses caused by physical or chemical phenomena were negligible. L A E T I T I A C . M . C O M M A N D E U R , * H A N S E . V A N E Y S E R E N , M A A R T E N R . O P M E E R , H A R R I E A . J . G O V E R S , A N D J O H N R . P A R S O N S
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