@article {726,
	title = {Biodegradation of ethylene dibromide (1,2-dibromoethane [EDB]) in microcosms simulating in situ and biostimulated conditions.},
	journal = {J Hazard Mater},
	volume = {209-210},
	year = {2012},
	month = {2012 Mar 30},
	pages = {92-8},
	abstract = {Although 1,2-dibromoethane (EDB) is a common groundwater contaminant, there is the lack of knowledge surrounding EDB biodegradation, especially under aerobic conditions. We have performed an extensive microcosm study to investigate the biodegradation of EDB under simulated in situ and biostimulated conditions. The materials for soil microcosms were collected from an EDB-contaminated aquifer at the Massachusetts Military Reservation in Cape Cod, MA. This EDB plume has persisted for nearly 40 years in both aerobic and anaerobic EDB zones of the aquifer. Microcosms were constructed under environmentally relevant conditions (field EDB and DO concentrations; incubated at 12{\textdegree}C). The results showed that natural attenuation occurred under anaerobic conditions but not under aerobic conditions, explaining why aerobic EDB contamination is so persistent. EDB degradation rates were greater under biostimulated conditions for both the aerobic and anaerobic microcosms. Particularly for aerobic biostimulation, methane-amended microcosms degraded EDB, on average, at a first order rate eight times faster than unamended microcosms. The best performing replicate achieved an EDB degradation rate of 7.0 yr(-1) (half-life (t(1/2))=0.10 yr). Residual methane concentrations and the emergence of methanotrophic bacteria, measured by culture independent bacterial analysis, provided strong indications that EDB degradation in aerobic methane-amended microcosms occurred via cometabolic degradation. These results indicate the potential for enhanced natural attenuation of EDB and that methane could be considered co-substrate for EDB bioremediation for the EDB-contaminated groundwater in aerobic zone.},
	keywords = {Aerobiosis, Anaerobiosis, Biodegradation, Environmental, Ethylene Dibromide, Water Microbiology, Water Pollutants, Chemical},
	issn = {1873-3336},
	doi = {10.1016/j.jhazmat.2011.12.067},
	author = {McKeever, Robert and Sheppard, Diane and N{\"u}sslein, Klaus and Baek, Kyung-Hwa and Rieber, Khalil and Ergas, Sarina J and Forbes, Rose and Hilyard, Mark and Park, Chul}
}
@article {730,
	title = {Phytoprotective influence of bacteria on growth and cadmium accumulation in the aquatic plant Lemna minor.},
	journal = {Water Res},
	volume = {44},
	year = {2010},
	month = {2010 Sep},
	pages = {4970-9},
	abstract = {Certain plants are known to accumulate heavy metals, and can be used in remediation of polluted soil or water. Plant-associated bacteria, especially those that are metal tolerant, may enhance the total amount of metal accumulated by the plant, but this process is still unclear. In this study, we investigated metal enhancement vs. exclusion by plants, and the phytoprotective role plant-associated bacteria might provide to plants exposed to heavy metal. We isolated cadmium-tolerant bacteria from the roots of the aquatic plant Lemna minor grown in heavy metal-polluted waters, and tested these isolates for tolerance to cadmium. The efficiency of plants to accumulate heavy metal from their surrounding environment was then tested by comparing L. minor plants grown with added metal tolerant bacteria to plants grown axenically to determine, whether bacteria associated with these plants increase metal accumulation in the plant. Unexpectedly, cadmium tolerance was not seen in all bacterial isolates that had been exposed to cadmium. Axenic plants accumulated slightly more cadmium than plants inoculated with bacterial isolates. Certain isolates promoted root growth, but overall, addition of bacterial strains did not enhance plant cadmium uptake, and in some cases, inhibited cadmium accumulation by plants. This suggests that bacteria serve a phytoprotective role in their relationship with Lemna minor, preventing toxic cadmium from entering plants.},
	keywords = {Adaptation, Physiological, Araceae, Bacteria, Biodegradation, Environmental, Cadmium, Hydrogen-Ion Concentration, Molecular Sequence Data, Plant Roots, Siderophores, Water},
	issn = {1879-2448},
	doi = {10.1016/j.watres.2010.07.073},
	author = {Stout, Lisa M and Dodova, Elena N and Tyson, Julian F and N{\"u}sslein, Klaus}
}
@article {743,
	title = {Arsenic sequestration by nitrate respiring microbial communities in urban lake sediments.},
	journal = {Chemosphere},
	volume = {70},
	year = {2007},
	month = {2007 Dec},
	pages = {329-36},
	abstract = {Changes in microbial community composition and activity were related to geochemical conditions favoring arsenic sequestration in sediments collected from the urban, arsenic-contaminated Upper Mystic Lake. After amendment with nitrate, >94\% total soluble arsenic is sequestered by Fe(III)-(oxy)hydroxides generated in live sediments. Of this sequestered arsenic, >75\% existed as As(III), indicating As redox state alone is not responsible for changes in mobility. Arsenic sequestration was concurrent with the microbial respiration of nitrate as indicated by steady state hydrogen concentration and the presence of organisms similar to nitrate-reducing, iron-oxidizing bacteria belonging to the genus Dechloromonas in 16S rDNA clone libraries.},
	keywords = {Arsenic, Betaproteobacteria, Biodegradation, Environmental, DNA, Bacterial, DNA, Ribosomal, Fresh Water, Geologic Sediments, Massachusetts, Nitrates, Oxidation-Reduction, RNA, Ribosomal, 16S, Urbanization, Water Microbiology, Water Pollutants, Chemical},
	issn = {0045-6535},
	doi = {10.1016/j.chemosphere.2007.05.094},
	author = {Gibney, Brian P and N{\"u}sslein, Klaus}
}
