Article Abstract:
Polychlorinated biphenyl (PCB)-dechlorinating microorganisms may have the ability to dehalogenate brominated biphenyls. A study aimed at finding out whether microorganisms from the PCB-contaminated sediment in Woods Pond in Lenox, MA, could dehalogenate brominated biphenyls. Results showed that all the brominated biphenyls were completely dehalogenated to biphenyl in live samples. However, there was no dehalogenation in autoclaved controls. Results further revealed that the meta and para substituents were first removed, after which debromination proceeded from the ortho positions.
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Article Abstract:
A study was conducted on reduced, transition metal cations Fe2+ and Cu+ to determine if they result in increased oxidative damage to cells stemming from hydroperoxides added externally or formed by oxygen metabolism. Results revealed that both cations induced faster killing of Streptococcus mutans in addition to inducing lethal damage under fully anaerobic conditions in a glove box with neither oxygen nor hydroperoxide exposure. Killing of S. mutans in response to millimolar levels of increased Fe2+ occurred over a wide range of temperatures and acidity.
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Article Abstract:
The white rot fungus, Pleurotus pulmonarius, exhibited high levels of atrazine biotransformation in liquid culture in the presence of manganese (Mn). The reaction was characterized by metabolite accumulation and increased lipid peroxidation, oxygenase and peroxidase activities and cytochrome P-450 levels. The addition of antioxidants and piperonyl butoxide inhibited lipoxygenase, peroxidase and P-450 activities. This suggests that that Mn-induced atrazine transformation is associated with stimulation of the oxygenating activities of P. pulmonarius.
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