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Iron reducing bacteria

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https://www.readbyqxmd.com/read/27875572/iron-regulated-phospholipase-c-activity-contributes-to-the-cytolytic-activity-and-virulence-of-acinetobacter-baumannii
#1
Steven E Fiester, Brock A Arivett, Robert E Schmidt, Amber C Beckett, Tomislav Ticak, Mary V Carrier, Rajarshi Ghosh, Emily J Ohneck, Maeva L Metz, Marlo K Sellin Jeffries, Luis A Actis
Acinetobacter baumannii is an opportunistic Gram-negative pathogen that causes a wide range of infections including pneumonia, septicemia, necrotizing fasciitis and severe wound and urinary tract infections. Analysis of A. baumannii representative strains grown in Chelex 100-treated medium for hemolytic activity demonstrated that this pathogen is increasingly hemolytic to sheep, human and horse erythrocytes, which interestingly contain increasing amounts of phosphatidylcholine in their membranes. Bioinformatic, genetic and functional analyses of 19 A...
2016: PloS One
https://www.readbyqxmd.com/read/27836410/using-the-natural-biodegradation-potential-of-shallow-soils-for-in-situ-remediation-of-deep-vadose-zone-and-groundwater
#2
Lior Avishai, Hagar Siebner, Ofer Dahan, Zeev Ronen
In this study, we examined the ability of top soil to degrade perchlorate from infiltrating polluted groundwater under unsaturated conditions. Column experiments designed to simulate typical remediation operation of daily wetting and draining cycles of contaminated water amended with an electron donor. Covering the infiltration area with bentonite ensured anaerobic conditions. The soil remained unsaturated, and redox potential dropped to less than -200mV. Perchlorate was reduced continuously from ∼1150mg/L at the inlet to ∼300mg/L at the outlet in daily cycles...
November 3, 2016: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/27801294/combined-genomic-and-structural-analyses-of-a-cultured-magnetotactic-bacterium-reveals-its-niche-adaptation-to-a-dynamic-environment
#3
Ana Carolina Vieira Araujo, Viviana Morillo, Jefferson Cypriano, Lia Cardoso Rocha Saraiva Teixeira, Pedro Leão, Sidcley Lyra, Luiz Gonzaga de Almeida, Dennis A Bazylinski, Ana Tereza Ribeiro de Vasconcellos, Fernanda Abreu, Ulysses Lins
BACKGROUND: Magnetotactic bacteria (MTB) are a unique group of prokaryotes that have a potentially high impact on global geochemical cycling of significant primary elements because of their metabolic plasticity and the ability to biomineralize iron-rich magnetic particles called magnetosomes. Understanding the genetic composition of the few cultivated MTB along with the unique morphological features of this group of bacteria may provide an important framework for discerning their potential biogeochemical roles in natural environments...
October 25, 2016: BMC Genomics
https://www.readbyqxmd.com/read/27794015/the-effect-of-peat-and-iron-supplements-on-the-severity-of-potato-common-scab-and-bacterial-community-in-tuberosphere-soil
#4
Ensyeh Sarikhani, Marketa Sagova-Mareckova, Marek Omelka, Jan Kopecky
The control of common scab (CS) of potatoes includes resistant cultivars, specific fertilization, increase of soil moisture and chemical treatments. Yet, these management practices do not have common or reproducible results at differing sites. In order to determine the effects of soil organic matter, iron and pH on CS development, peat and DTPA-chelated iron were supplemented to pots filled with soil conducive for CS. All results were compared with the same data obtained for a suppressive soil, which has naturally low severity of CS and occurs nearby...
January 2017: FEMS Microbiology Ecology
https://www.readbyqxmd.com/read/27791286/biodegradation-and-mineralization-of-isotopically-labeled-tnt-and-rdx-in-anaerobic-marine-sediments
#5
Thivanka Ariyarathna, Penny Vlahos, Richard W Smith, Stephen Fallis, Thomas Groshens, Craig Tobias
The lack of knowledge on fate of explosive compounds, 2,4,6-trinitrotoluene (TNT) and hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX) particularly in marine ecosystems constrains the application of bioremediation techniques in explosive-contaminated coastal sites. Here, we present a comparative study on anaerobic biodegradation and mineralization of (15) N-nitro group isotopically labeled TNT and RDX in organic-carbon-rich, fine-grained marine sediment with native microbial assemblages. Separate sediment slurry experiments were carried out for TNT and RDX at 23°C for 16 days...
October 28, 2016: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/27790193/inhibition-of-xanthomonas-fragariae-causative-agent-of-angular-leaf-spot-of-strawberry-through-iron-deprivation
#6
Peter M Henry, Samantha J Gebben, Jan J Tech, Jennifer L Yip, Johan H J Leveau
In commercial production settings, few options exist to prevent or treat angular leaf spot (ALS) of strawberry, a disease of economic importance and caused by the bacterial pathogen Xanthomonas fragariae. In the process of isolating and identifying X. fragariae bacteria from symptomatic plants, we observed growth inhibition of X. fragariae by bacterial isolates from the same leaf macerates. Identified as species of Pseudomonas and Rhizobium, these isolates were confirmed to suppress growth of X. fragariae in agar overlay plates and in microtiter plate cultures, as did our reference strain Pseudomonas putida KT2440...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27783109/combination-of-zero-valent-iron-and-anaerobic-microorganisms-immobilized-in-luffa-sponge-for-degrading-1-1-1-trichloroethane-and-the-relevant-microbial-community-analysis
#7
Wenbing Wang, Yanqing Wu
1,1,1-Trichloroethane (1,1,1-TCA), a dense non-aqueous phase liquid (DNAPL), is relatively slow to remediate naturally; combination of zero-valent iron and immobilized microorganism is a potential means to accelerate DNAPL biodegradation. We first adopted high density luffa sponge (HDLS) as immobilized microorganism carrier. The experimental results demonstrated that (1) the supernatant liquid microorganisms were the optimal immobilized microorganisms for HDLS and (2) the combination of zero-valent iron and immobilized microorganisms accelerated 1,1,1-TCA transformation...
October 25, 2016: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/27768826/intensive-cryptic-microbial-iron-cycling-in-the-low-iron-water-column-of-the-meromictic-lake-cadagno
#8
Jasmine S Berg, Dolma Michellod, Petra Pjevac, Clara Martinez-Perez, Caroline R T Buckner, Philipp F Hach, Carsten J Schubert, Jana Milucka, Marcel M M Kuypers
Iron redox reactions play an important role in carbon remineralization, supporting large microbial communities in iron-rich terrestrial and aquatic sediments. Stratified water columns with comparably low iron concentrations are globally widespread, but microbial iron cycling in these systems has largely been ignored. We found evidence for unexpectedly high iron turnover rates in the low (1-2 µmol·l(-1) ) iron waters of Lake Cadagno. Light-dependent, biological iron oxidation rates (1.4-13.8 µmol·l(-1) ·d(-1) ) were even higher than in ferruginous lakes with well-studied microbial iron cycles...
October 21, 2016: Environmental Microbiology
https://www.readbyqxmd.com/read/27761153/involvement-of-fenton-chemistry-in-rice-straw-degradation-by-the-lignocellulolytic-bacterium-pantoea-ananatis-sd-1
#9
Jiangshan Ma, Keke Zhang, Mei Huang, Stanton B Hector, Bin Liu, Chunyi Tong, Qian Liu, Jiarui Zeng, Yan Gao, Ting Xu, Ying Liu, Xuanming Liu, Yonghua Zhu
BACKGROUND: Lignocellulolytic bacteria have revealed to be a promising source for biofuel production, yet the underlying mechanisms are still worth exploring. Our previous study inferred that the highly efficient lignocellulose degradation by bacterium Pantoea ananatis Sd-1 might involve Fenton chemistry (Fe(2+) + H2O2 + H(+) → Fe(3+) + OH· + H2O), similar to that of white-rot and brown-rot fungi. The aim of this work is to investigate the existence of this Fenton-based oxidation mechanism in the rice straw degradation process of P...
2016: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/27757565/the-impact-of-lactoferrin-with-different-levels-of-metal-saturation-on-the-intestinal-epithelial-barrier-function-and-mucosal-inflammation
#10
Grzegorz Majka, Grażyna Więcek, Małgorzata Śróttek, Klaudyna Śpiewak, Małgorzata Brindell, Joanna Koziel, Janusz Marcinkiewicz, Magdalena Strus
Translocation of bacteria, primarily Gram-negative pathogenic flora, from the intestinal lumen into the circulatory system leads to sepsis. In newborns, and especially very low birth weight infants, sepsis is a major cause of morbidity and mortality. The results of recently conducted clinical trials suggest that lactoferrin, an iron-binding protein that is abundant in mammalian colostrum and milk, may be an effective agent in preventing sepsis in newborns. However, despite numerous basic studies on lactoferrin, very little is known about how metal saturation of this protein affects a host's health...
December 2016: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
https://www.readbyqxmd.com/read/27750167/mercury-methylation-and-sulfate-reduction-rates-in-mangrove-sediments-rio-de-janeiro-brazil-the-role-of-different-microorganism-consortia
#11
Raquel Rose Silva Correia, Jean Remy Davée Guimarães
Recent studies have shown Hg methylation in mangrove sediments, however, little is known about the different microorganism consortia involved. We investigated the participation of prokaryotes in general, iron-reducing bacteria-IRB, sulfate-reducing bacteria-SRB, methanogens and fungi in Hg methylation and sulfate reduction rates (SRR) in mangrove sediments using iron amendments for IRB and specific inhibitors for the other microorganisms. Sediment samples were collected from two mangrove zones, tidal flat and mangrove forest (named root sediments)...
October 14, 2016: Chemosphere
https://www.readbyqxmd.com/read/27722355/impacts-of-coal-ash-on-methylmercury-production-and-the-methylating-microbial-community-in-anaerobic-sediment-slurries
#12
Grace E Schwartz, Lauren K Redfern, Kaoru Ikuma, Claudia K Gunsch, Laura S Ruhl, Avner Vengosh, Heileen Hsu-Kim
Mercury (Hg) associated with coal ash is an environmental concern, particularly if the release of coal ash to the environment is associated with the conversion of inorganic Hg to methylmercury (MeHg), a bioaccumulative form of Hg that is produced by anaerobic microorganisms. In this study, sediment slurry microcosm experiments were performed to understand how spilled coal ash might influence MeHg production in anaerobic sediments of an aquatic ecosystem. Two coal ash types were used: (1) a weathered coal ash; and (2) a freshly collected, unweathered fly ash that was relatively enriched in sulfate and Hg compared to the weathered ash...
October 5, 2016: Environmental Science. Processes & Impacts
https://www.readbyqxmd.com/read/27720546/biochar-increases-arsenic-release-from-an-anaerobic-paddy-soil-due-to-enhanced-microbial-reduction-of-iron-and-arsenic
#13
Ning Wang, Xi-Mei Xue, Albert L Juhasz, Zhi-Zhou Chang, Hong-Bo Li
Previous studies have shown that biochar enhances microbial reduction of iron (Fe) oxyhydroxide under anaerobic incubation. However, there is a lack of data on its influence on arsenic (As) release from As-contaminated paddy soils. In this study, paddy soil slurries (120 mg As kg(-1)) were incubated under anaerobic conditions for 60 days with and without the addition of biochar (3%, w/w) prepared from rice straw at 500 °C. Arsenic release, Fe reduction, and As fractionation were determined at 1, 10, 20, 30, and 60 d, while Illumina sequencing and real-time PCR were used to characterize changes in soil microbial community structure and As transformation function genes...
January 2017: Environmental Pollution
https://www.readbyqxmd.com/read/27713730/high-iron-sequestrating-bifidobacteria-inhibit-enteropathogen-growth-and-adhesion-to-intestinal-epithelial-cells-in-vitro
#14
Pamela Vazquez-Gutierrez, Tomas de Wouters, Julia Werder, Christophe Chassard, Christophe Lacroix
The gut microbiota plays an important role in host health, in particular by its barrier effect and competition with exogenous pathogenic bacteria. In the present study, the competition of Bifidobacterium pseudolongum PV8-2 (Bp PV8-2) and Bifidobacterium kashiwanohense PV20-2 (Bk PV20-2), isolated from anemic infant gut microbiota and selected for their high iron sequestration properties, was investigated against Salmonella Typhimurium (S. Typhi) and Escherichia coli O157:H45 (EHEC) by using co-culture tests and assays with intestinal cell lines...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27713727/microbial-community-structure-of-subglacial-lake-whillans-west-antarctica
#15
Amanda M Achberger, Brent C Christner, Alexander B Michaud, John C Priscu, Mark L Skidmore, Trista J Vick-Majors
Subglacial Lake Whillans (SLW) is located beneath ∼800 m of ice on the Whillans Ice Stream in West Antarctica and was sampled in January of 2013, providing the first opportunity to directly examine water and sediments from an Antarctic subglacial lake. To minimize the introduction of surface contaminants to SLW during its exploration, an access borehole was created using a microbiologically clean hot water drill designed to reduce the number and viability of microorganisms in the drilling water. Analysis of 16S rRNA genes (rDNA) amplified from samples of the drilling and borehole water allowed an evaluation of the efficacy of this approach and enabled a confident assessment of the SLW ecosystem inhabitants...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27710797/arsenic-removal-by-discontinuous-zvi-two-steps-system-for-drinking-water-production-at-household-scale
#16
Barbara Casentini, Fabiano Teo Falcione, Stefano Amalfitano, Stefano Fazi, Simona Rossetti
Different countries in Europe still suffer of elevated arsenic (As) concentration in groundwaters used for human consumption. In the case of households not connected to the distribution system, decentralized water supply systems, such as Point of Use (POU) and Point of Entry (POE), offer a direct benefit for the consumers. Field scale ex-situ treatment systems based on metallic iron (ZVI) are already available for the production of reduced volumes of drinking water in remote areas (village scale). To address drinking water needs at larger scale, we designed a pilot unit able to produce an elevated daily volume of water for human consumption...
September 28, 2016: Water Research
https://www.readbyqxmd.com/read/27708623/biostimulation-of-indigenous-microbial-community-for-bioremediation-of-petroleum-refinery-sludge
#17
Jayeeta Sarkar, Sufia K Kazy, Abhishek Gupta, Avishek Dutta, Balaram Mohapatra, Ajoy Roy, Paramita Bera, Adinpunya Mitra, Pinaki Sar
Nutrient deficiency severely impairs the catabolic activity of indigenous microorganisms in hydrocarbon rich environments (HREs) and limits the rate of intrinsic bioremediation. The present study aimed to characterize the microbial community in refinery waste and evaluate the scope for biostimulation based in situ bioremediation. Samples recovered from the wastewater lagoon of Guwahati refinery revealed a hydrocarbon enriched [high total petroleum hydrocarbon (TPH)], oxygen-, moisture-limited, reducing environment...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27701830/growth-of-magnetotactic-sulfate-reducing-bacteria-in-oxygen-concentration-gradient-medium
#18
Christopher T Lefèvre, Paul A Howse, Marian L Schmidt, Monique Sabaty, Nicolas Menguy, George W Luther, Dennis A Bazylinski
Although dissimilatory sulfate-reducing bacteria (SRB) are generally described as strictly anaerobic organisms with regard to growth, several reports have shown that some SRB, particularly Desulfovibrio species, are quite resistant to O2 . For example, SRB remain viable in many aerobic environments while some even reduce O2 to H2 O. However, reproducible aerobic growth of SRB has not been unequivocally documented. Desulfovibrio magneticus is a SRB that is also a magnetotactic bacterium (MTB). MTB biomineralize magnetosomes which are intracellular, membrane-bounded, magnetic iron mineral crystals...
October 4, 2016: Environmental Microbiology Reports
https://www.readbyqxmd.com/read/27698381/the-shift-of-microbial-communities-and-their-roles-in-sulfur-and-iron-cycling-in-a-copper-ore-bioleaching-system
#19
Jiaojiao Niu, Jie Deng, Yunhua Xiao, Zhili He, Xian Zhang, J D Van Nostrand, Yili Liang, Ye Deng, Xueduan Liu, Huaqun Yin
Bioleaching has been employed commercially to recover metals from low grade ores, but the production efficiency remains to be improved due to limited understanding of the system. This study examined the shift of microbial communities and S&Fe cycling in three subsystems within a copper ore bioleaching system: leaching heap (LH), leaching solution (LS) and sediment under LS. Results showed that both LH and LS had higher relative abundance of S and Fe oxidizing bacteria, while S and Fe reducing bacteria were more abundant in the Sediment...
October 4, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27694047/degradation-mechanisms-of-ddx-induced-by-the-addition-of-toluene-and-glycerol-as-cosubstrates-in-a-zero-valent-iron-pretreated-soil
#20
Antonio Velasco, Arturo Aburto-Medina, Esmaeil Shahsavari, Sergio Revah, Irmene Ortiz
Abiotic and biotic processes can be used to remediate DDX (DDT, DDD, DDE, and DDNS) contaminated soils; these processes can be fostered using specific carbon-amendments to stimulate particular soil indigenous microbial communities to improve rates or extent of degradation. In this study, toluene and glycerol were evaluated as cosubstrates under aerobic and anoxic conditions to determine the degradation efficiencies of DDX and to elucidate possible degradation mechanisms. Slurry microcosms experiments were performed during 60 days using pretreated soil with zero-valent iron (ZVI)...
September 22, 2016: Journal of Hazardous Materials
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