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Nitrate reducing bacteria

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https://www.readbyqxmd.com/read/28537018/syntrophic-association-and-performance-of-clostridium-desulfovibrio-aeromonas-and-tetrathiobacter-as-anodic-biocatalysts-for-bioelectricity-generation-in-dual-chamber-microbial-fuel-cell
#1
Smita S Kumar, Sandeep K Malyan, Suddhasatwa Basu, Narsi R Bishnoi
Anode chamber of a dual chamber microbial fuel cell (MFC) having raw landfill leachate was inoculated with consortium of sulphate-reducing bacteria (SRB) and sulphide-oxidizing bacteria (SOB) to study the phylogenetic architecture, function and mutualism of anolyte community developed in the reactor. Enriched microbial community was analysed with the help of Illumina MiSeq and indicated the dominance of Firmicutes (41.4%), Clostridia (36.4%) and Clostridium (12.9%) at phylum, class and genus level, respectively...
May 23, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28533768/novel-large-sulfur-bacteria-in-the-metagenomes-of-groundwater-fed-chemosynthetic-microbial-mats-in-the-lake-huron-basin
#2
Allison M Sharrar, Beverly E Flood, Jake V Bailey, Daniel S Jones, Bopaiah A Biddanda, Steven A Ruberg, Daniel N Marcus, Gregory J Dick
Little is known about large sulfur bacteria (LSB) that inhabit sulfidic groundwater seeps in large lakes. To examine how geochemically relevant microbial metabolisms are partitioned among community members, we conducted metagenomic analysis of a chemosynthetic microbial mat in the Isolated Sinkhole, which is in a deep, aphotic environment of Lake Huron. For comparison, we also analyzed a white mat in an artesian fountain that is fed by groundwater similar to Isolated Sinkhole, but that sits in shallow water and is exposed to sunlight...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28517029/carbon-driven-enrichment-of-the-crucial-nitrate-reducing-bacteria-in-limed-peat-soil-microcosms
#3
Ying Zhu, Xiaoyuan Zhang, Xiaogang Wu, Guanzhou Chen, Lars R Bakken, Liping Zhao, Åsa Frostegård, Xiaojun Zhang
Bacteria of Dechloromonas were recognized as potential functional important denitrifiers in a long term shell sand amended peat soil. Different microcosms in a solid matrix and slurry systems with the addition of carbon and nitrogen sources, e.g., clover leaves, glutamate, and nitrate, were established. The bacterial community structures were analyzed by pyrosequencing of the 16S rRNA gene to select the conditions for enriching bacteria of Dechloromonas. The results showed that a relatively even bacterial community in the initial soil shifted to communities dominated by a few types of nitrate reducing bacteria after the incubation, which strongly responded to the carbon substrates addition and consumption...
May 18, 2017: Letters in Applied Microbiology
https://www.readbyqxmd.com/read/28491136/applications-of-microalgal-biofilms-for-wastewater-treatment-and-bioenergy-production
#4
Ana F Miranda, Narasimhan Ramkumar, Constandino Andriotis, Thorben Höltkemeier, Aneela Yasmin, Simone Rochfort, Donald Wlodkowic, Paul Morrison, Felicity Roddick, German Spangenberg, Banwari Lal, Sanjukta Subudhi, Aidyn Mouradov
BACKGROUND: Microalgae have shown clear advantages for the production of biofuels compared with energy crops. Apart from their high growth rates and substantial lipid/triacylglycerol yields, microalgae can grow in wastewaters (animal, municipal and mining wastewaters) efficiently removing their primary nutrients (C, N, and P), heavy metals and micropollutants, and they do not compete with crops for arable lands. However, fundamental barriers to the industrial application of microalgae for biofuel production still include high costs of removing the algae from the water and the water from the algae which can account for up to 30-40% of the total cost of biodiesel production...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28463771/enhancing-denitrification-using-a-novel-in-situ-membrane-biofilm-reactor-ismbfr
#5
Yonghong Wu, Yizhou Li, Aura Ontiveros-Valencia, Luis Ordaz-Díaz, Junzhuo Liu, Chen Zhou, Bruce E Rittmann
The insufficient supply of electron donor in surface water contaminated with nitrate leads to its incomplete reduction in natural or constructed wetlands. Although the addition of organic matter (represented as chemical oxygen demand, COD) can stimulate N removal by denitrification, direct supplementation of COD creates unacceptable risks to effluent quality. An alternative for stimulating denitrification is supplying hydrogen gas (H2) as an inorganic electron donor. We evaluate an innovative means to do H2-based denitrification of surface waters in a wetland setting: the in-situ membrane biofilm reactor (isMBfR), in which H2 is delivered to a biofilm of denitrifying bacteria on demand based on the presence of nitrate...
April 25, 2017: Water Research
https://www.readbyqxmd.com/read/28455336/insights-into-nitrate-reducing-fe-ii-oxidation-mechanisms-by-analyzing-cell-mineral-associations-cell-encrustation-and-mineralogy-in-the-chemolithoautotrophic-enrichment-culture-ks
#6
M Nordhoff, C Tominski, M Halama, J M Byrne, M Obst, S Kleindienst, S Behrens, A Kappler
Most described nitrate-reducing Fe(II)-oxidizing bacteria (NRFeOB) are mixotrophic and depend on organic co-substrates for growth. Encrustation of cells in Fe(III)-minerals has been observed for mixotrophic NRFeOB, but not for autotrophic phototrophic and microaerophilic Fe(II)-oxidizers. So far, little is known about cell-mineral-associations in the few existing autotrophic NRFeOB. Here we investigate whether the designated autotrophic Fe(II)-oxidizing strain (closely-related to Gallionella and Sideroxydans) or the heterotrophic nitrate-reducers that are present in the autotrophic nitrate-reducing Fe(II)-oxidizing enrichment culture KS, form mineral crusts during Fe(II) oxidation under autotrophic and mixotrophic conditions...
April 28, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28444419/the-role-of-localized-acidity-generation-in-microbially-influenced-corrosion
#7
REVIEW
Yuriy Kryachko, Sean M Hemmingsen
Microbially influenced corrosion is of great industrial concern. Microbial coupling of metal oxidation to sulfate-, nitrate-, nitrite-, or CO2-reduction is proton-mediated, and some sulfate-reducing prokaryotes are capable of regulating extracellular pH. The analysis of the corrosive processes catalyzed by nitrate reducing bacteria and methanogenic archaea indicates that these microorganisms may be capable of regulating extracellular pH as well. It is proposed that nutrient limitation at metal-biofilm interfaces may induce activation of enzymatic proton-producing/proton-secreting functions in respiratory and methanogenic microorganisms to make them capable of using Fe(0) as the electron donor...
April 26, 2017: Current Microbiology
https://www.readbyqxmd.com/read/28441606/growth-inhibition-and-antibiofilm-potential-of-ag-nanoparticles-coated-with-lectin-an-arthropod-immune-molecule
#8
Sangily Jayanthi, Sathappan Shanthi, Baskaralingam Vaseeharan, Narayanan Gopi, Marimuthu Govindarajan, Naiyf S Alharbi, Shine Kadaikunnan, Jamal M Khaled, Giovanni Benelli
Lectins from the haemolymph of arthropods, including crustaceans, are molecules potentially involved in the immune recognition and phagocytosis. Here, lectin was purified from the haemolymph of blue swimmer crab Portunus pelagicus, using mannose-coupled sepharose CL-4B affinity column chromatography. In SDS-PAGE analysis, lectin showed a molecular mass of approximately 155kDa. The synthesis of lectin-coated silver nanoparticles (lectin-coated AgNPs) was confirmed by UV-Vis spectroscopy, XRD, FTIR, SEM, TEM, SAED, and EDX analysis...
May 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28411476/trimethyl-chitosan-capped-silver-nanoparticles-with-positive-surface-charge-their-catalytic-activity-and-antibacterial-spectrum-including-multidrug-resistant-strains-of-acinetobacter-baumannii
#9
T Y Chang, C C Chen, K M Cheng, C Y Chin, Y H Chen, X A Chen, J R Sun, J J Young, T S Chiueh
We report a facile route for the green synthesis of trimethyl chitosan nitrate-capped silver nanoparticles (TMCN-AgNPs) with positive surface charge. In this synthesis, silver nitrate, glucose, and trimethyl chitosan nitrate (TMCN) were used as silver precursor, reducing agent, and stabilizer, respectively. The reaction was carried out in a stirred basic aqueous medium at room temperature without the use of energy-consuming or expensive equipment. We investigated the effects of the concentrations of NaOH, glucose, and TMCN on the particle size, zeta potential, and formation yield...
April 1, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28380222/green-biosynthesis-of-spherical-silver-nanoparticles-by-using-date-palm-phoenix-dactylifera-fruit-extract-and-study-of-their-antibacterial-and-catalytic-activities
#10
Saeed Farhadi, Bahram Ajerloo, Abdelnassar Mohammadi
In this work, we have synthesized spherical silver nanoparticles (Ag NPs) by a low-cost, rapid, simple and ecofriendly approach using Date palm fruit extract as a novel natural reducing and stabilizing agent. The product was characterized by UV-visible spectroscopy, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), atomic force microscopy (AFM), energy-dispersive X-ray (EDX) spectroscopy and Zeta potential measurements...
2017: Acta Chimica Slovenica
https://www.readbyqxmd.com/read/28378285/nitrate-decreases-methane-production-also-by-increasing-methane-oxidation-through-stimulating-nc10-population-in-ruminal-culture
#11
Lihui Liu, Xiurong Xu, Yangchun Cao, Chuanjiang Cai, Hongxiao Cui, Junhu Yao
Studies proved that addition of nitrate in rumen could lead to reduction of methane emission. The mechanism of this function was involved in the competition effect of nitrate on hydrogen consumption and the inhibitory effect of generated nitrite on methanogen proliferation. The present study investigated an alternative mechanism that denitrifying anaerobic methane oxidizing (DAMO) bacteria, DAMO archaea and anammox bacteria may co-exist in rumen, therefore, more methane can be oxidized when addition of nitrate...
December 2017: AMB Express
https://www.readbyqxmd.com/read/28372926/epsilonproteobacteria-dominate-bacterial-diversity-at-a-natural-tar-seep
#12
Florence Lormières, Phil M Oger
The bacterial diversity of a naturally seeping bitumen source was investigated by 16S rRNA gene cloning and sequencing. Epsilonproteobacteria were shown to dominate the bacterial diversity in the underground water and within the bitumen, representing ca. 75% of the total bacterial diversity. These Epsilonproteobacteria were dominated by Sulfurimonas OTUs, while Sulfurovum and Arcobacter OTUs completed the remaining diversity. Epsilonproteobacteria are sulfur-oxidizer, nitrate-reducing chemo-lithoautotrophic bacteria, unable to use most organics for growth but capable of CO2 fixation...
March 31, 2017: Comptes Rendus Biologies
https://www.readbyqxmd.com/read/28369150/isolation-and-characterization-of-magnetospirillum-sp-strain-15-1-as-a-representative-anaerobic-toluene-degrader-from-a-constructed-wetland-model
#13
Ingrid Meyer-Cifuentes, Paula M Martinez-Lavanchy, Vianey Marin-Cevada, Stefanie Böhnke, Hauke Harms, Jochen A Müller, Hermann J Heipieper
Previously, Planted Fixed-Bed Reactors (PFRs) have been used to investigate microbial toluene removal in the rhizosphere of constructed wetlands. Aerobic toluene degradation was predominant in these model systems although bulk redox conditions were hypoxic to anoxic. However, culture-independent approaches indicated also that microbes capable of anaerobic toluene degradation were abundant. Therefore, we aimed at isolating anaerobic-toluene degraders from one of these PFRs. From the obtained colonies which consisted of spirilli-shaped bacteria, a strain designated 15-1 was selected for further investigations...
2017: PloS One
https://www.readbyqxmd.com/read/28353075/oral-microbiome-and-nitric-oxide-the-missing-link-in-the-management-of-blood-pressure
#14
REVIEW
Nathan S Bryan, Gena Tribble, Nikola Angelov
Having high blood pressure puts you at risk for heart disease and stroke, which are leading causes of death in the USA and worldwide. One out of every three Americans has hypertension, and it is estimated that despite aggressive treatment with medications, only about half of those medicated have managed blood pressure. Recent discoveries of the oral microbiome that reduces inorganic nitrate to nitrite and nitric oxide provide a new therapeutic target for the management of hypertension. The presence or absence of select and specific bacteria may determine steady-state blood pressure levels...
April 2017: Current Hypertension Reports
https://www.readbyqxmd.com/read/28342335/enhanced-antimicrobial-efficacy-of-thermal-reduced-silver-nanoparticles-supported-by-titanium-dioxide
#15
Yen-Chi Chen, Kuo-Pin Yu
The antimicrobial efficacy of silver nanoparticles (AgNPs) is influenced by many factors, including the particle size, AgNP oxidation state and support materials. In this study, AgNPs are synthesized and supported by two types of TiO2 powders (P25 and Merck TiO2) using two heat-treatment temperatures (120 and 200°C). The formation of well-dispersed AgNPs with diameters ranging from 3.2 to 5.7nm was confirmed using transmission electron microscopy. X-ray photoelectron spectroscopy and X-ray diffraction indicated that the majority of the AgNPs were reduced from Ag(+) to Ag(0) at 200°C...
June 1, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28335288/biosynthesis-of-silver-nanoparticles-using-taxus-yunnanensis-callus-and-their-antibacterial-activity-and-cytotoxicity-in-human-cancer-cells
#16
Qian Hua Xia, Yan Jun Ma, Jian Wen Wang
Plant constituents could act as chelating/reducing or capping agents for synthesis of silver nanoparticles (AgNPs). The green synthesis of AgNPs has been considered as an environmental friendly and cost-effective alternative to other fabrication methods. The present work described the biosynthesis of AgNPs using callus extracts from Taxus yunnanensis and evaluated their antibacterial activities in vitro and potential cytotoxicity in cancer cells. Callus extracts were able to reduce silver nitrate at 1 mM in 10 min...
September 1, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335201/size-and-shape-dependent-antibacterial-studies-of-silver-nanoparticles-synthesized-by-wet-chemical-routes
#17
Muhammad Akram Raza, Zakia Kanwal, Anum Rauf, Anjum Nasim Sabri, Saira Riaz, Shahzad Naseem
Silver nanoparticles (AgNPs) of different shapes and sizes were prepared by solution-based chemical reduction routes. Silver nitrate was used as a precursor, tri-sodium citrate (TSC) and sodium borohydride as reducing agents, while polyvinylpyrrolidone (PVP) was used as a stabilizing agent. The morphology, size, and structural properties of obtained nanoparticles were characterized by scanning electron microscopy (SEM), UV-visible spectroscopy (UV-VIS), and X-ray diffraction (XRD) techniques. Spherical AgNPs, as depicted by SEM, were found to have diameters in the range of 15 to 90 nm while lengths of the edges of the triangular particles were about 150 nm...
April 15, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28330107/population-dynamics-of-soil-bacteria-in-some-areas-of-midnapore-coastal-belt-west-bengal-india
#18
Syed Afrin Azmi, Soumendranath Chatterjee
In this present study the population dynamics of the soil bacteria of some coastal villages, namely Padima, Jatimati, Chanpabani, Palsandapur, Bhagibaharampur, Duttapur, Gangadharpur, Gobindabasan, Somaibasan of Digha, West Bengal, India, was determined. In these villages the aerobic heterotrophic, Gram-negative, spore-forming, starch-hydrolyzing, Pseudomonas, nitrate-reducing, denitrifying, asymbiotic N2 fixing, nitrifying, phosphate-solubilizing bacterial populations ranged from 1.22 to 2.67 × 10(6), 0...
June 2016: 3 Biotech
https://www.readbyqxmd.com/read/28321487/benzene-degradation-in-a-denitrifying-biofilm-reactor-activity-and-microbial-community-composition
#19
Marcelle J van der Waals, Siavash Atashgahi, Ulisses Nunes da Rocha, Bas M van der Zaan, Hauke Smidt, Jan Gerritse
Benzene is an aromatic compound and harmful for the environment. Biodegradation of benzene can reduce the toxicological risk after accidental or controlled release of this chemical in the environment. In this study, we further characterized an anaerobic continuous biofilm culture grown for more than 14 years on benzene with nitrate as electron acceptor. We determined steady state degradation rates, microbial community composition dynamics in the biofilm, and the initial anaerobic benzene degradation reactions...
March 20, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28316045/nitrogen-removal-and-microbial-community-shift-in-an-aerobic-denitrification-reactor-bioaugmented-with-a-pseudomonas-strain-for-coal-based-ethylene-glycol-industry-wastewater-treatment
#20
Cong Du, Chong-Wei Cui, Shan Qiu, Sheng-Nan Shi, Ang Li, Fang Ma
An aerobic denitrification system, initially bioaugmented with Pseudomonas strain T13, was established to treat coal-based ethylene glycol industry wastewater, which contained 3219 ± 86 mg/L total nitrogen (TN) and 1978 ± 14 mg/L NO3(-)-N. In the current study, a stable denitrification efficiency of 53.7 ± 4.7% and nitrite removal efficiency of 40.1 ± 2.7% were achieved at different diluted influent concentrations. Toxicity evaluation showed that a lower toxicity of effluent was achieved when industry wastewater was treated by stuffing biofilm communities compared to suspended communities...
March 18, 2017: Environmental Science and Pollution Research International
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