Journal ArticleDOI
The Ecology of Arsenic
Ronald S. Oremland,John F. Stolz +1 more
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This work reviews what is known about arsenic-metabolizing bacteria and their potential impact on speciation and mobilization of arsenic in nature and investigates their role in aquifers.Abstract:
Arsenic is a metalloid whose name conjures up images of murder. Nonetheless, certain prokaryotes use arsenic oxyanions for energy generation, either by oxidizing arsenite or by respiring arsenate. These microbes are phylogenetically diverse and occur in a wide range of habitats. Arsenic cycling may take place in the absence of oxygen and can contribute to organic matter oxidation. In aquifers, these microbial reactions may mobilize arsenic from the solid to the aqueous phase, resulting in contaminated drinking water. Here we review what is known about arsenic-metabolizing bacteria and their potential impact on speciation and mobilization of arsenic in nature.read more
Citations
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Journal ArticleDOI
Role of metal-reducing bacteria in arsenic release from Bengal delta sediments
Farhana Islam,Andrew G. Gault,Christopher Boothman,David A. Polya,John M. Charnock,John M. Charnock,Debashis Chatterjee,Jonathan R. Lloyd +7 more
TL;DR: It is shown that anaerobic metal-reducing bacteria can play a key role in the mobilization of arsenic in sediments collected from a contaminated aquifer in West Bengal and that, for the sediments in this study, arsenic release took place after Fe(iii) reduction, rather than occurring simultaneously.
Journal ArticleDOI
Arsenic(V) removal from groundwater using nano scale zero-valent iron as a colloidal reactive barrier material.
TL;DR: The effects of competing anions revealed that HCO3-, H4SiO4(0), and H2PO4(2-) are potential interfering agents in the As(V) adsorption reaction.
Journal ArticleDOI
Arsenic removal using mesoporous alumina prepared via a templating method.
TL;DR: In this article, mesoprous alumina (MA) with a wide surface area (307 m2/g) and uniform pore size (3.5 nm) was prepared, and a spongelike interlinked pore system was developed through a post-hydrolysis method.
Journal ArticleDOI
Arsenic binding to proteins.
TL;DR: Although the adverse health effects arising from exposure to arsenic have been well-recognized, the mechanism(s) of action responsible for the diverse range of health effects are complicated and poorly understood.
Journal ArticleDOI
Arsenic and selenium in microbial metabolism.
TL;DR: This review highlights recent advances in ecology, biochemistry, and molecular biology and provides a prelude to the impact of genomics studies.
References
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Journal ArticleDOI
Occurrence of Monomethylarsonous Acid in Urine of Humans Exposed to Inorganic Arsenic
H V Aposhian,Eugene Gurzau,Le Xc,Anca Elena Gurzau,S. M. Healy,Xiufen Lu,Mingsheng Ma,Yip L,R. A. Zakharyan,Maiorino Rm,Richard C. Dart,Tircus Mg,Gonzalez-Ramirez D,Morgan Dl,Avram D,Aposhian Mm +15 more
TL;DR: The results indicate that future studies concerning urinary arsenic profiles of arsenic-exposed humans must determine MMA(III) concentrations, previous studies of urinary profiles dealing with humans exposed to arsenic need to be re-examined and re-evaluated, and a re-examination is needed of the two hypotheses which hold that methylation is a detoxication process for inorganic arsenite.
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Arsenic alters the function of the glucocorticoid receptor as a transcription factor.
TL;DR: Data indicate that nontoxic doses of arsenite can interact directly with GR complexes and selectively inhibit GR-mediated transcription, which is associated with altered nuclear function rather than a decrease in hormone-induced GR activation or nuclear translocation.
Journal ArticleDOI
The paradox of arsenic: molecular mechanisms of cell transformation and chemotherapeutic effects
Ann M. Bode,Zigang Dong +1 more
TL;DR: The primary purpose of this review is to examine recent findings, from this laboratory and others, that focus on the molecular mechanisms of arsenic's actions in cell transformation and as a therapeutic agent.
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Isolation, Growth, and Metabolism of an Obligately Anaerobic, Selenate-Respiring Bacterium, Strain SES-3
Ronald S. Oremland,Jodi Switzer Blum,Charles W. Culbertson,Pieter T. Visscher,Laurence G. Miller,Phillip Dowdle,Frances E. Strohmaier +6 more
TL;DR: Results suggest that reduction of selenite to Se may proceed, in part, by some of the components of a dissimilatory system for sulfur oxyanions.
Journal ArticleDOI
Isolation and Characterization of a Novel As(V)-Reducing Bacterium: Implications for Arsenic Mobilization and the Genus Desulfitobacterium
TL;DR: The isolation of an Fe(III)- and As(V)-reducing bacterium from Lake Coeur d'Alene suggests a mechanism for arsenic mobilization in these contaminated sediments while the discovery of metal or metalloid respiration in the genus Desulfitobacterium has implications for environments cocontaminated with arsenious and chlorophenolic compounds.