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Recent Findings in Environmental Science and Technology Described by Researchers from McMaster University (Microbial engineering of floc fe and trace...

September 10, 2014



Recent Findings in Environmental Science and Technology Described by Researchers from McMaster University (Microbial engineering of floc fe and trace element geochemistry in a circumneutral, remote lake)

By a News Reporter-Staff News Editor at Biotech Week -- A new study on Environmental Science and Technology is now available. According to news originating from Hamilton, Canada, by NewsRx correspondents, research stated, "Evaluation of lacustrine floc Fe, Pb, and Cd biogeochemistry over seasonal (summer, winter) and water column depth (metalimnetic, hypolimnetic) scales reveals depth-independent seasonally significant differences in floc Fe biominerals and trace element (TE: Pb, Cd) sequestration, driven by floc microbial community shifts. Winter floc [TE] were significantly lower than summer [TE], driven by declining abundance and reactivity of floc amorphous Fe((III))-(oxy)hydroxide (FeOOH) phases under ice ([FeOOH](summer)=37-77 mgg(-1) vs [FeOOH](winter)=0.3-7 mgg(-1))."

Our news journalists obtained a quote from the research from McMaster University, "Further, while high summer floc [FeOOH] was observed at both water column depths, winter floc was dominated by Fe((II)) phases. However, the observed seasonal change in the nature and concentrations of floc Fe-phases was independent of water column [Fe], O2, and pH and, instead, significantly correlated to floc bacterial community membership. Bioinformatic modeling (Unifrac, PCA analyses) of in situ and experimental microcosm results identified a temperature-driven seasonal turnover of floc microbial communities, shifting from dominantly putative Fe metabolisms within summer floc to wintertime ancillary Fe reducing and S metabolizing bacteria. This seasonal shift of floc microbial community functioning, significantly the wintertime loss of microbial Fe((II))-oxidizing capability and concomitant increases of sulfur-reducing bacteria, alters dominant floc Fe minerals from Fe((III)) to Fe((II)) phases."

According to the news editors, the research concluded: "This resulted in decreased winter floc [TE], not predicted by water column geochemistry."

For more information on this research see: Microbial engineering of floc fe and trace element geochemistry in a circumneutral, remote lake. Environmental Science & Technology, 2014;48(12):6578-87. (American Chemical Society - www.acs.org; Environmental Science & Technology - www.pubs.acs.org/journal/esthag)

The news correspondents report that additional information may be obtained from A.V. Elliott, School of Geography and Earth Sciences, McMaster University , 1280 Main Street West, Hamilton, Ontario L8S 4K1, Canada (see also Environmental Science and Technology).

Keywords for this news article include: Hamilton, Ontario, Canada, North and Central America, Chemicals, Chemistry, Environmental Science and Technology, Geochemistry.

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


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Source: Biotech Week


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