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Iron reducing bacteria

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https://www.readbyqxmd.com/read/28811642/octahedron-iron-oxide-nanocrystals-prohibited-clostridium-difficile-spore-germination-and-attenuated-local-and-systemic-inflammation
#1
Wei-Ting Lee, Ya-Na Wu, Yi-Hsuan Chen, Shang-Rung Wu, Tsai-Miao Shih, Tsung-Ju Li, Li-Xing Yang, Chen-Sheng Yeh, Pei-Jane Tsai, Dar-Bin Shieh
Clinical management of Clostridium difficile infection is still far from satisfactory as bacterial spores are resistant to many chemical agents and physical treatments. Certain types of nanoparticles have been demonstrated to exhibit anti-microbial efficacy even in multi-drug resistance bacteria. However, most of these studies failed to show biocompatibility to the mammalian host cells and no study has revealed in vivo efficacy in C. difficile infection animal models. The spores treated with 500 µg/mL Fe3-δO4 nanoparticles for 20 minutes, 64% of the spores were inhibited from transforming into vegetative cells, which was close to the results of the sodium hypochlorite-treated positive control...
August 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28803152/bioassessment-of-heavy-metal-toxicity-and-enhancement-of-heavy-metal-removal-by-sulfate-reducing-bacteria-in-the-presence-of-zero-valent-iron
#2
Jing Guo, Yong Kang, Ying Feng
A simple and valid toxicity evaluation of Zn(2+), Mn(2+) and Cr(6+) on sulfate-reducing bacteria (SRB) and heavy metal removal were investigated using the SRB system and SRB+Fe(0) system. The heavy metal toxicity coefficient (β) and the heavy metal concentration resulting in 50% inhibition of sulfate reduction (I) from a modeling process were proposed to evaluate the heavy metal toxicity and nonlinear regression was applied to search for evaluation indices β and I. The heavy metal toxicity order was Cr(6+) > Mn(2+) > Zn(2+)...
August 9, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28799940/experimental-study-on-treating-agate-dyeing-wastewater-with-sulfate-reducing-bacteria-strengthening-peanut-shells-and-scrap-iron
#3
Junzhen Di, Mingxin Wang
To solve the problems of high concentrations of Cr(6+), SO4(2-) and H(+) in agate dyeing industrial wastewater and heavy pollution and high treating cost, single-factor and orthogonal experiments were conducted to determine the optimum particle size, the ratio of adsorbents dosing and hydraulic retention time based on peanut shells and scrap iron. Experiments, using five dynamic columns filled with the peanut shells, scrap iron and sulfate-reducing bacteria (SRB), were also conducted to determine the effect and mechanism of treating the wastewater...
August 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28780359/change-regularity-of-water-quality-parameters-in-leakage-flow-conditions-and-their-relationship-with-iron-release
#4
Jingqing Liu, Huabin Shentu, Huanyu Chen, Ping Ye, Bing Xu, Yifu Zhang, Hamid Bastani, Hongxi Peng, Lei Chen, Tuqiao Zhang
The long-term stagnation in metal water supply pipes, usually caused by intermittent consumption patterns, will cause significant iron release and water quality deterioration, especially at the terminus of pipelines. Another common phenomenon at the terminus of pipelines is leakage, which is considered helpful by allowing seepage of low-quality drinking water resulting from long-term stagnation. In this study, the effect of laminar flow on alleviating water quality deterioration under different leakage conditions was investigated, and the potential thresholds of the flow rate, which can affect the iron release process, were discussed...
July 16, 2017: Water Research
https://www.readbyqxmd.com/read/28777963/biochar-accelerates-microbial-reductive-debromination-of-2-2-4-4-tetrabromodiphenyl-ether-bde-47-in-anaerobic-mangrove-sediments
#5
Juan Chen, Chao Wang, Ying Pan, Shazia Shyla Farzana, Nora Fung-Yee Tam
A common congener of polybrominated diphenyl ethers, 2,2',4,4'-tetrabromodiphenyl ether (BDE-47), is a prevalent, persistent and toxic pollutant. It could be removed by reduction debromination by microorganisms but the rate is often slow. The study hypothesized that spent mushroom substrate derived biochar amendment could accelerate the microbial reductive debromination of BDE-47 in anaerobic mangrove sediment slurries and evaluated the mechanisms behind. At the end of 20-week experiment, percentages of residual BDE-47 in slurries amended with biochar were significantly lower but debromination products were higher than those without biochar...
July 28, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28774270/strand-specific-transcriptomes-of-enterohemorrhagic-escherichia-coli-in-response-to-interactions-with-ground-beef-microbiota-interactions-between-microorganisms-in-raw-meat
#6
Wessam Galia, Francoise Leriche, Stéphane Cruveiller, Cindy Garnier, Vincent Navratil, Audrey Dubost, Stéphanie Blanquet-Diot, Delphine Thevenot-Sergentet
BACKGROUND: Enterohemorrhagic Escherichia coli (EHEC) are zoonotic agents associated with outbreaks worldwide. Growth of EHEC strains in ground beef could be inhibited by background microbiota that is present initially at levels greater than that of the pathogen E. coli. However, how the microbiota outcompetes the pathogenic bacteria is unknown. Our objective was to identify metabolic pathways of EHEC that were altered by natural microbiota in order to improve our understanding of the mechanisms controlling the growth and survival of EHECs in ground beef...
August 3, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28764124/arsenic-mobilization-in-spent-nzvi-waste-residue-effect-of-pantoea-sp-imh
#7
Li Ye, Wenjing Liu, Qiantao Shi, Chuanyong Jing
Nanoscale zero-valent iron (nZVI) is an effective arsenic (As) scavenger. However, spent nZVI may pose a higher environmental risk than our initial thought in the presence of As-reducing bacteria. Therefore, our motivation was to explore the As redox transformation and release in spent nZVI waste residue in contact with Pantoea sp. IMH, an arsC gene container adopting the As detoxification pathway. Our incubation results showed that IMH preferentially reduce soluble As(V), not solid-bound As(V), and was innocent in elevating total dissolved As concentrations...
July 28, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28760901/synthetic-porcine-hepcidin-exerts-opposite-roles-in-escherichia-coli-and-salmonella-infections
#8
Dan Liu, Zhen-Shun Gan, Wan Ma, Hai-Tao Xiong, Yun-Qing Li, Yi-Zhen Wang, Hua-Hua Du
Hepcidin, an antimicrobial peptide, was discovered to integrate diverse signals from iron status and infection threat and orchestrate a series of host protective responses. There have been several studies investigating the antimicrobial role of hepcidin but controversial. Here, we aim to examine the role of hepcidin in bacterial adherence and invasion in vitro We found that porcine hepcidin could decrease the amount of extracellular pathogen enterotoxigenic Escherichia coli (ETEC) K88 that adhered to cells by aggregating bacteria...
July 31, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28717590/construction-of-a-fur-null-mutant-and-rna-sequencing-provide-deeper-global-understanding-of-the-aliivibrio-salmonicida-fur-regulon
#9
Sunniva Katharina Thode, Cecilie Bækkedal, Jenny Johansson Söderberg, Erik Hjerde, Hilde Hansen, Peik Haugen
BACKGROUND: The ferric uptake regulator (Fur) is a transcription factor and the main regulator of iron acquisition in prokaryotes. When bound to ferric iron, Fur recognizes its DNA binding site and generally executes its function by repressing transcription of its target genes. Due to its importance in virulence, the Fur regulon is well studied for several model bacteria. In our previous work, we used computational predictions and microarray to gain insights into Fur-regulation in Aliivibrio salmonicida, and have identified a number of genes and operons that appear to be under direct control of Fur...
2017: PeerJ
https://www.readbyqxmd.com/read/28715664/electron-transfer-mediators-accelerated-the-microbiologically-influence-corrosion-against-carbon-steel-by-nitrate-reducing-pseudomonas-aeruginosa-biofilm
#10
Ru Jia, Dongqing Yang, Dake Xu, Tingyue Gu
Electron transfer is a rate-limiting step in microbiologically influenced corrosion (MIC) caused by microbes that utilize extracellular electrons. Cross-cell wall electron transfer is necessary to transport the electrons released from extracellular iron oxidation into the cytoplasm of cells. Electron transfer mediators were found to accelerate the MIC caused by sulfate reducing bacteria. However, there is no publication in the literature showing the effect of electron transfer mediators on MIC caused by nitrate reducing bacteria (NRB)...
June 29, 2017: Bioelectrochemistry
https://www.readbyqxmd.com/read/28690982/deferiprone-and-gallium-protoporphyrin-have-the-capacity-to-potentiate-the-activity-of-antibiotics-in-staphylococcus-aureus-small-colony-variants
#11
Katharina Richter, Nicky Thomas, Guimin Zhang, Clive A Prestidge, Tom Coenye, Peter-John Wormald, Sarah Vreugde
Small colony variants (SCVs) of bacteria like Staphylococcus aureus are characterized by a reduced colony size and are linked to increased antibiotic tolerance and resistance. Their altered expression of virulence factors, slow growing properties and their ability to form biofilms make the eradication of SCVs challenging. In the context of biofilm-related infectious diseases involving S. aureus SCVs, a therapy targeting bacterial iron metabolism was evaluated. The combination of the iron-chelator deferiprone (Def) and the heme-analog gallium-protoporphyrin (GaPP), in solution and incorporated in a surgical wound gel, was tested for activity against planktonic and sessile SCVs...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28677239/microbial-community-structure-and-soil-ph-correspond-to-methane-production-in-arctic-alaska-soils
#12
Robert Wagner, Donatella Zona, Walter Oechel, David Lipson
While there is no doubt that biogenic methane production in the Arctic is an important aspect of global methane emissions, the relative roles of microbial community characteristics and soil environmental conditions in controlling Arctic methane emissions remains uncertain. Here, relevant methane-cycling microbial groups were investigated at two remote Arctic sites with respect to soil potential methane production (PMP). Percent abundances of methanogens and iron-reducing bacteria correlated with increased PMP, while methanotrophs correlated with decreased PMP...
July 5, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28672697/stratification-of-chlorinated-ethenes-natural-attenuation-in-an-alluvial-aquifer-assessed-by-hydrochemical-and-biomolecular-tools
#13
Jan Němeček, Iva Dolinová, Jiřina Macháčková, Roman Špánek, Alena Ševců, Tomáš Lederer, Miroslav Černík
Biomolecular and hydrochemical tools were used to evaluate natural attenuation of chlorinated ethenes in a Quaternary alluvial aquifer located close to a historical source of large-scale tetrachloroethylene (PCE) contamination. Distinct stratification of redox zones was observed, despite the aquifer's small thickness (2.8 m). The uppermost zone of the target aquifer was characterised by oxygen- and nitrate-reducing conditions, with mixed iron- to sulphate-reducing conditions dominant in the lower zone, along with indications of methanogenesis...
October 2017: Chemosphere
https://www.readbyqxmd.com/read/28652609/a-novel-stress-response-mechanism-triggered-by-indole-involved-in-quorum-quenching-enzyme-moml-and-iron-sulfur-cluster-in-muricauda-olearia-th120
#14
Yan Wang, Hui Li, Xinxin Cui, Xiao-Hua Zhang
Indole, as a signal molecule, is involved in multiple physiological behavior including biofilm formation, antibiotic resistance and virulence. In this study, we demonstrated that indole was involved in iron deficient and H2O2 stress response in Muricauda olearia Th120. Transcriptome analysis showed that totally 206 genes were regulated by exogenous indole. Besides, momL-suf gene cluster, consisting of quorum quenching enzyme coding gene momL and iron-sulfur biosynthetic genes suf, were involved in indole-induced stress response pathway...
June 26, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28648065/membrane-alterations-in-pseudomonas-putida-f1-exposed-to-nanoscale-zerovalent-iron-effects-of-short-term-and-repetitive-nzvi-exposure
#15
Panaya Kotchaplai, Eakalak Khan, Alisa S Vangnai
In this study, we report the effect of the commercial nanoscale zerovalent iron (nZVI) on environmental bacteria, emphasizing the importance of nZVI-bacterial membrane interaction on nZVI toxicity as well as the adaptability of bacteria to nZVI. Exposure of Pseudomonas putida F1 to 0.1, 1.0, and 5.0 g/L of nZVI caused the reduction in colony forming units (CFUs) substantially for almost 3 orders of magnitude. However, a rebound in the cell number was observed after the prolonged exposure except for 5.0 g/L nZVI at which bacterial viability was completely inhibited...
July 10, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28636310/sensing-mechanisms-in-the-redox-regulated-2fe-2s-cluster-containing-bacterial-transcriptional-factor-soxr
#16
Kazuo Kobayashi
Bacteria possess molecular biosensors that enable responses to a variety of stressful conditions, including oxidative stress, toxic compounds, and interactions with other organisms, through elaborately coordinated regulation of gene expression. In Escherichia coli and related bacteria, the transcription factor SoxR functions as a sensor of oxidative stress and nitric oxide (NO). SoxR protein contains a [2Fe-2S] cluster essential for its transcription-enhancing activity, which is regulated by redox changes in the [2Fe-2S] cluster...
June 21, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28631141/cell-labeling-with-magneto-endosymbionts-and-the-dissection-of-the-subcellular-location-fate-and-host-cell-interactions
#17
Kayla R Lee, Abdul Wakeel, Papia Chakraborty, Chandler S Foote, Lauren Kajiura, Joyce C Barrozo, Andrea C Chan, Alexey V Bazarov, Ryan Spitler, Peter M Kutny, Jim M Denegre, Rob A Taft, Joachim Seemann, Bradley W Rice, Christopher H Contag, Brian K Rutt, Caleb B Bell
PURPOSE: The purposes of this study are to characterize magneto-endosymbiont (ME) labeling of mammalian cells and to discern the subcellular fate of these living contrast agents. MEs are novel magnetic resonance imaging (MRI) contrast agents that are being used for cell tracking studies. Understanding the fate of MEs in host cells is valuable for designing in vivo cell tracking experiments. PROCEDURES: The ME's surface epitopes, contrast-producing paramagnetic magnetosomal iron, and genome were studied using immunocytochemistry (ICC), Fe and MRI contrast measurements, and quantitative polymerase chain reaction (qPCR), respectively...
June 19, 2017: Molecular Imaging and Biology: MIB: the Official Publication of the Academy of Molecular Imaging
https://www.readbyqxmd.com/read/28618865/streptococcus-thermophilus-ncimb-41856-ameliorates-signs-of-colitis-in-an-animal-model-of-inflammatory-bowel-disease
#18
J R Bailey, V Vince, N A Williams, T A Cogan
Treatment of inflammatory bowel disease (IBD) is mainly based on suppression of symptoms, often with numerous side effects. Trials of probiotics in IBD have frequently produced disappointing results. The majority of probiotics are unusual, since they do not require iron for growth, unlike many bacteria resident in the intestine. The IBD intestine is iron-rich due to bleeding and use of oral iron supplements; conventional probiotics would be rapidly outcompeted. We have evaluated an iron-responsive Streptococcus thermophilus strain for its potential to reduce signs of colitis...
June 16, 2017: Beneficial Microbes
https://www.readbyqxmd.com/read/28593521/identification-of-siderophore-producing-and-cynogenic-fluorescent-pseudomonas-and-a-simple-confrontation-assay-to-identify-potential-bio-control-agent-for-collar-rot-of-chickpea
#19
Anil S Kotasthane, Toshy Agrawal, Najam Waris Zaidi, U S Singh
In soil, plant roots coexist with bacteria and fungi that produce siderophores capable of sequestering the available iron. Microbial cyanogenesis has been demonstrated in many species of fungi and in a few species of bacteria (e.g., Chromobacterium and Pseudomonas). Fluorescent Pseudomonas isolates P29, P59, P144, P166, P174, P187, P191 and P192 were cyanogenic and produced siderophores in the presence of a strong chelater 8-Hydroxyquinoline (50 mg/l). A simple confrontation assay for identifying potential antagonists was developed...
June 2017: 3 Biotech
https://www.readbyqxmd.com/read/28585174/a-patent-landscape-on-application-of-microorganisms-in-construction-industry
#20
REVIEW
Dipti Dapurkar, Manasi Telang
Construction biotechnology includes research and development of construction materials and processes that make use of various microbes. The present technology landscape gives a perspective on how microbes have been used in construction industry as cement and concrete additives by analyzing patents filed in this technology arena. All patents related to the technology of interest published globally to date have been reviewed. The earliest patent filing in this technology domain was recorded in the year 1958 and the patenting activity reached its peak around mid to late 1990s...
July 2017: World Journal of Microbiology & Biotechnology
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