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
Respiration of Arsenate and Selenate by Hyperthermophilic Archaea
TL;DR: Comparative studies showed, that Pyrobaculum aerophilum was also able to grow organotrophically under anaerobic culture conditions in the presence of arsenate, selenate and selenite, and in contrast to P. arsenaticum, P. aerophILum could use selenates or arsenate for lithoautotrophic growth with carbon dioxide and hydrogen.
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Nitrate Controls on Iron and Arsenic in an Urban Lake
David B. Senn,Harold F. Hemond +1 more
TL;DR: Nitrate, a common aquatic pollutant, strongly influenced the cycling of arsenic (As) under anoxic conditions in urban Upper Mystic Lake by oxidizing ferrous iron [Fe(II)] to produce As-sorbing particulate hydrous ferric oxides and causing the more oxidized As(V), which is more particle-reactive than As(III) under these conditions, to dominate.
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Arsenite oxidation and arsenate respiration by a new Thermus isolate.
TL;DR: The isolate, designated HR13, was identified as a Thermus species based on 16S rDNA phylogenetic relationships and close sequence similarity within the Thermus genus and was capable of rapidly oxidizing inorganic As(III) to As(V).
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Sulfurospirillum barnesii sp. nov. and Sulfurospirillum arsenophilum sp. nov., new members of the Sulfurospirillum clade of the epsilon Proteobacteria.
John F. Stolz,Debra J. Ellis,Jodi Switzer Blum,Dianne Ahmann,Derek R. Lovley,Ronald S. Oremland +5 more
TL;DR: Two strains of dissimilatory arsenate-reducing vibrio-shaped bacteria are assigned to the genus Sulfurospirillum and form a distinct clade within the epsilon subclass of the Proteobacteria based on 16S rRNA analysis.
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Microbial populations associated with the reduction and enhanced mobilization of arsenic in mine tailings
TL;DR: The results indicate that microbial reduction of As(V) in As-contaminated soils may occur under aerobic conditions over relatively short time scales resulting in enhanced As mobilization.