PMID: 18409612Apr 16, 2008Paper

Influence of nitrate on microbial reduction of pertechnetate

Environmental Science & Technology
Xiangzhen Li, Lee R Krumholz

Abstract

Factors influencing microbial reduction of Tc(VII) in nitrate and radionuclide contaminated aquifer sediments were investigated using sediment microcosms containing organic electron donor, nitrate and Tc(VII). Microcosms underwent nitrate reduction followed by Tc(VII) reduction. During this transition, the microbial community changed from being dominated by bacteria affiliated with the genus Paenibacillus during the nitrate reduction phase, to those affiliated with genera Agrobacterium, Geothrix, and Desulfosporosinus during the Tc(VII) reduction phase. To investigate the mechanism of Tc(VII) reduction, the nitrate reducing strains Agrobacterium FRC-A2, Azoarcus FRC-B1, and a fermentative Clostridium FRC-C11 were isolated from sediment microcosms undergoing Tc(VII) reduction. Nitrate reducing bacteria reduced Tc(VII) effectively only in the presence of Fe(lll) and after nitrate was reduced, implying a major role for Fe(ll) as an electron shuttle in Tc(VII) reduction. It is likely that accumulation of nitrite blocks Fe(ll) production and hence Tc(VII) reduction during the active nitrate reduction phase. The pure culture of Clostridium FRC-C11 is able to reduce Tc(VII) enzymatically with H2 or glucose as electron donor and deposi...Continue Reading

References

Jan 1, 1993·Annual Review of Microbiology·D R Lovley
Nov 11, 1999·International Journal of Systematic Bacteriology·J D CoatesD R Lovley
Aug 31, 2000·Applied and Environmental Microbiology·J R LloydD R Lovley
Feb 24, 2001·International Journal of Systematic and Evolutionary Microbiology·W J RobertsonB J Mee
May 2, 2001·Environmental Science & Technology·K A WeberE E Roden
Sep 26, 2001·Applied and Environmental Microbiology·G De LucaA Verméglio
Jun 6, 2003·Applied and Environmental Microbiology·Kelly P NevinDerek R Lovley
Jan 31, 2004·Environmental Science & Technology·J D IstokD C White
May 12, 2005·Environmental Science & Technology·John M SenkoLee R Krumholz
Jun 30, 2005·Environmental Science & Technology·Ian T BurkeKatherine Morris
Nov 22, 2005·Environmental Science & Technology·Wayne W LukensNorman M Edelstein
Jul 1, 1987·Applied and Environmental Microbiology·D R Lovley, E J Phillips
Feb 1, 1996·Applied and Environmental Microbiology·J R Lloyd, L E Macaskie
Apr 1, 1996·Applied and Environmental Microbiology·K L StraubF Widdel
Apr 21, 2006·Environmental Microbiology·E Danielle RhineL Y Young
Jun 22, 2006·Environmental Science & Technology·Ian T BurkeKatherine Morris
Sep 27, 2006·Environmental Science & Technology·Estela Reinoso MasetMiranda J Keith-Roach
Dec 13, 2006·Environmental Science & Technology·Mandy M MichalsenJonathan D Istok

❮ Previous
Next ❯

Citations

Mar 15, 2011·Environmental Science & Technology·P Evan DreselMichael J Truex
Jun 17, 2011·The ISME Journal·Satoshi IshiiKeishi Senoo
Mar 19, 2014·Applied and Environmental Microbiology·So-Jeong KimSung-Keun Rhee
Dec 31, 2009·Environmental Science & Technology·Gareth T W LawKatherine Morris

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.