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Nitrate reducing bacteria

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https://www.readbyqxmd.com/read/29442249/the-vertical-distribution-of-prokaryotes-in-the-surface-sediment-of-jiaolong-cold-seep-at-the-northern-south-china-sea
#1
Yuzhi Wu, Jian-Wen Qiu, Pei-Yuan Qian, Yong Wang
In deep-sea cold seeps, microbial communities are shaped by geochemical components in seepage solutions. In the present study, we report the composition of microbial communities and potential metabolic activities in the surface sediment of Jiaolong cold seep at the northern South China Sea. Pyrosequencing of 16S rRNA gene amplicons revealed that a majority of the microbial inhabitants of the surface layers (0-6 cm) were sulfur oxidizer bacteria Sulfurimonas and archaeal methane consumer ANME-1, while sulfate reducer bacteria SEEP-SRB1, ANME-1 and ANME-2 dominated the bottom layers (8-14 cm)...
February 13, 2018: Extremophiles: Life Under Extreme Conditions
https://www.readbyqxmd.com/read/29428840/organ-uptake-and-release-of-inorganic-nitrate-and-nitrite-in-the-pig
#2
Karin E Eriksson, Ting Yang, Mattias Carlström, Eddie Weitzberg
Numerous studies have shown beneficial cardiovascular and metabolic effects of dietary nitrate but the release or uptake of these anions on an organ level is still poorly elucidated. Here we administered sodium nitrate in the pig and measured acute changes in release/uptake of nitrate and nitrite across several organs as well as cardiovascular and metabolic functions. In 17 anesthetized pigs multiple venous catheters and arterial ultrasonic blood flow probes were positioned. After pretreatment with the NO synthase (NOS) inhibitor l-NAME to minimize involvement of NOS-dependent nitrate/nitrite generation, the animals received bolus injections of either sodium nitrate or sodium chloride...
February 8, 2018: Nitric Oxide: Biology and Chemistry
https://www.readbyqxmd.com/read/29428615/potential-of-hydrolyzed-polyacrylamide-biodegradation-to-final-products-through-regulating-its-own-nitrogen-transformation-in-different-dissolved-oxygen-systems
#3
Congcong Zhang, Lanmei Zhao, Mutai Bao, Jinren Lu
Potential of hydrolyzed polyacrylamide (HPAM) biodegradation to final products was studied through regulating its own nitrogen transformation. Under the conditions of 2, 3 and 4 mg/L of DO, HPAM removal ratio reached 16.92%, 24.51% and 30.78% and the corresponding removal ratio reached 49.15%, 60.25% and 76.44% after anaerobic biodegradation. NO3--N concentration was 9.43, 14.10 and 17.99 mg/L in aerobic stages and the corresponding concentration was 0.17, 0.07 and 0.008 mg/L after anaerobic biodegradation...
February 2, 2018: Bioresource Technology
https://www.readbyqxmd.com/read/29421752/the-content-of-trace-element-iron-is-a-key-factor-for-competition-between-anaerobic-ammonium-oxidation-and-methane-dependent-denitrification-processes
#4
Yong-Ze Lu, Liang Fu, Na Li, Jing Ding, Ya-Nan Bai, Petros Samaras, Raymond Jianxiong Zeng
Coupling of anaerobic ammonium oxidation (Anammox) with denitrifying anaerobic methane oxidation (DAMO) is a sustainable pathway for nitrogen removal and reducing methane emissions from wastewater treatment processes. However, studies on the competitive relation between Anammox bacteria and DAMO bacteria are limited. Here, we investigated the effects of variations in the contents of trace element iron on Anammox and DAMO microorganisms. The short-term results indicated that optimal concentrations of iron, which obviously stimulated the activity of Amammox bacteria, DAMO bacteria and DAMO archaea, were 80, 20, and 80 μM, respectively...
February 1, 2018: Chemosphere
https://www.readbyqxmd.com/read/29414056/nitrification-in-agricultural-soils-impact-actors-and-mitigation
#5
REVIEW
Fabian Beeckman, Hans Motte, Tom Beeckman
Nitrogen is one of the most important nutrients for plant growth and hence heavily applied in agricultural systems via fertilization. Nitrification, that is, the conversion of ammonium via nitrite to nitrate by soil microorganisms, however, leads to nitrate leaching and gaseous nitrous oxide production and as such to an up to 50% loss of nitrogen availability for the plant. Nitrate leaching also results in eutrophication of groundwater, drinking water and recreational waters, toxic algal blooms and biodiversity loss, while nitrous oxide is a greenhouse gas with a global warming potential 300× greater than carbon dioxide...
January 30, 2018: Current Opinion in Biotechnology
https://www.readbyqxmd.com/read/29378402/who-is-the-rock-miner-and-who-is-the-hunter-the-use-of-heavy-oxygen-labelled-phosphate-p18o4-to-differentiate-between-c-and-p-fluxes-in-a-benzene-degrading-consortium
#6
Steven Mamet, Bin Ma, Ania C Ulrich, Aimée Schryer, Steven D Siciliano
Phosphorus availability and cycling in microbial communities is a key determinant of bacterial activity. However, identifying organisms critical to P cycling in complex biodegrading consortia has proven elusive. Here we assess a new DNA stable isotope probing (SIP) technique using heavy oxygen-labelled phosphate (P18O4) and its effectiveness in pure cultures and a nitrate-reducing benzene-degrading consortium. First, we successfully labelled pure cultures of gram-positive Micrococcus luteus and gram-negative Bradyrhizobium elkanii, and separated isotopically light and heavy DNA in pure cultures using centrifugal analyses...
January 29, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29376168/mercury-methylation-in-stormwater-retention-ponds-at-different-stages-in-the-management-lifecycle
#7
R J Strickman, C P J Mitchell
Stormwater retention ponds effectively manage erosion, flooding, and pollutant loadings, but are also sources of methylmercury (MeHg), a bioaccumulative neurotoxin which is produced by anaerobic aquatic microorganisms. Stormwater retention ponds have a 10-15 year working life, after which they are dredged and reflooded. In this study, we related MeHg biogeochemistry to the different stages of the management lifecycle. In a new, a dredged, and a mature stormwater retention pond, we measured MeHg and inorganic mercury (IHg) concentrations, and the potential for MeHg formation (Kmeth), during the early summer, peak summer, and fall of 2013...
January 29, 2018: Environmental Science. Processes & Impacts
https://www.readbyqxmd.com/read/29355416/antimicrobial-activity-of-a-colloidal-agnp-suspension-demonstrated-in-vitro-against-monoculture-biofilms-toward-a-novel-tooth-disinfectant-for-treating-dental-caries
#8
D R Schwass, K M Lyons, R Love, G R Tompkins, C J Meledandri
A novel silver nanoparticle (AgNP) formulation was developed as a targeted application for the disinfection of carious dentine. Silver nitrate (AgNO3) was chemically reduced using sodium borohydrate (NaBH4) in the presence of sodium dodecyl sulfate (SDS) to form micelle aggregate structures containing monodisperse 6.7- to 9.2-nm stabilized AgNPs. AgNPs were characterized by measurement of electrical conductivity and dynamic light scattering, scanning electron microscopy, transmission electron microscopy, and inductively coupled plasma mass spectrometry...
February 2018: Advances in Dental Research
https://www.readbyqxmd.com/read/29329018/corrosion-effect-of-bacillus-cereus-on-x80-pipeline-steel-in-a-beijing-soil-environment
#9
Hongxia Wan, Dongdong Song, Dawei Zhang, Cuiwei Du, Dake Xu, Zhiyong Liu, De Ding, Xiaogang Li
The corrosion of X80 pipeline steel in the presence of Bacillus cereus (B. cereus) was studied through electrochemical and surface analyses and live/dead staining. Scanning electron microscopy and live/dead straining results showed that a number of B. cereus adhered to the X80 steel. Electrochemical impedance spectroscopy showed that B. cereus could accelerate the corrosion of X80 steel. In addition, surface morphology observations indicated that B. cereus could accelerate pitting corrosion in X80 steel. The depth of the largest pits due to B...
December 24, 2017: Bioelectrochemistry
https://www.readbyqxmd.com/read/29324294/microbial-community-of-a-gasworks-aquifer-and-identification-of-nitrate-reducing-azoarcus-and-georgfuchsia-as-key-players-in-btex-degradation
#10
Martin Sperfeld, Charlotte Rauschenbach, Gabriele Diekert, Sandra Studenik
We analyzed a coal tar polluted aquifer of a former gasworks site in Thuringia (Germany) for the presence and function of aromatic compound-degrading bacteria (ACDB) by 16S rRNA Illumina sequencing, bamA clone library sequencing and cultivation attempts. The relative abundance of ACDB was highest close to the source of contamination. Up to 44% of total 16S rRNA sequences were affiliated to ACDB including genera such as Azoarcus, Georgfuchsia, Rhodoferax, Sulfuritalea (all Betaproteobacteria) and Pelotomaculum (Firmicutes)...
December 20, 2017: Water Research
https://www.readbyqxmd.com/read/29303410/relationship-of-nutrient-dynamics-and-bacterial-community-structure-at-the-water-sediment-interface-using-a-benthic-chamber-experiment
#11
Bo-Min Ki, In Ae Huh, Jung-Hyun Choi, Kyung-Suk Cho
The relationships between nutrient dynamics and the bacterial community at the water-sediment interface were investigated using the results of nutrient release fluxes, bacterial communities examined by 16S rRNA pyrosequencing and canonical correlation analysis (CCA) accompanied by lab-scale benthic chamber experiment. The nutrient release fluxes from the sediments into the water were as follows: -3.832 to 12.157 mg m-2 d-1 for total phosphorus, 0.049 to 9.993 mg m-2 d-1 for PO4-P, -2.011 to 41.699 mg m-2 d-1 for total nitrogen, -7...
January 5, 2018: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/29289920/achieving-high-level-nitrogen-removal-in-mainstream-by-coupling-anammox-with-denitrifying-anaerobic-methane-oxidation-in-a-membrane-biofilm-reactor
#12
Guo-Jun Xie, Tao Liu, Chen Cai, Shihu Hu, Zhiguo Yuan
To achieve energy neutral wastewater treatment, mainstream anaerobic ammonium oxidation (anammox) has attracted extensive attention in the past decade. However, the relatively high effluent nitrogen concentration (>10 mg N L-1) remains a significant barrier hindering its practical implementation. A novel technology integrating the anammox and denitrifying anaerobic methane oxidation (DAMO) reactions in a membrane biofilm reactor (MBfR) was developed in this study to enhance the mainstream anammox process...
December 20, 2017: Water Research
https://www.readbyqxmd.com/read/29282292/the-radical-sam-protein-hemw-is-a-heme-chaperone
#13
Vera Haskamp, Simone Karrie, Toni Mingers, Stefan Barthels, François Alberge, Axel Magalon, Katrin Müller, Eckard Bill, Wolfgang Lubitz, Kirstin Kleeberg, Peter Schweyen, Martin Bröring, Martina Jahn, Dieter Jahn
Radical S-adenosylmethionine (SAM) enzymes exist in organisms from all kingdoms of life, and all of these proteins generate an adenosyl radical via the homolytic cleavage of the S-C(5') bond of SAM. Of particular interest are radical SAM enzymes, such as heme chaperones, that insert heme into respiratory enzymes. For example, heme chaperones insert heme into target proteins, but have been studied only for the formation of cytochrome c type hemoproteins. Here, we report that a radical SAM protein, the heme chaperone HemW from bacteria, is required for the insertion of heme b into respiratory chain enzymes...
December 27, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29251817/mitigation-of-nitrous-oxide-emissions-from-acidic-soils-by-bacillus-amyloliquefaciens-a-plant-growth-promoting-bacterium
#14
Shanghua Wu, Guoqiang Zhuang, Zhihui Bai, Yu Cen, Shengjun Xu, Haishu Sun, Xingguo Han, Xuliang Zhuang
Nitrous oxide (N2 O) is a long-lived greenhouse gas that can result in the alteration of atmospheric chemistry and cause accompanying changes in global climate. To date, many techniques have been used to mitigate the emissions of N2 O from agricultural fields, which represent one of the most important sources of N2 O. In this study, we designed a greenhouse pot experiment and a microcosmic serum bottle incubation experiment using acidic soil from a vegetable farm to study the effects of Bacillus amyloliquefaciens (BA) on plant growth and N2 O emission rates...
December 18, 2017: Global Change Biology
https://www.readbyqxmd.com/read/29241129/improving-biocathode-community-multifunctionality-by-polarity-inversion-for-simultaneous-bioelectroreduction-processes-in-domestic-wastewater
#15
Hui Yun, Bin Liang, Deyong Kong, Aijie Wang
Bioelectrochemical systems (BESs) have been tentatively applied for wastewater treatment processes, but the complex composition of wastewater could lead to difficulties in establishing functional biofilm or result in performance instability. Few studies have investigated the enrichment of biocathode with domestic wastewater (DW) and the function. A biocathode with multi-pollutant removal capabilities was enriched based on polarity inverted bioanode, which was established with DW. The biocathode function was examined using model pollutants (nitrate, nitrobenzene and Acid Orange 7) supplemented as sole or mixed electron acceptors...
December 7, 2017: Chemosphere
https://www.readbyqxmd.com/read/29238173/a-light-assisted-in-situ-embedment-of-silver-nanoparticles-to-prepare-functionalized-fabrics
#16
Her Shuang Toh, Roxanne Line Faure, Liyana Bte Mohd Amin, Crystal Yu Fang Hay, Saji George
This article presents a simple, one-step, in situ generation of silver nanoparticle-functionalized fabrics with antibacterial properties, circumventing the conventional, multistep, time-consuming methods. Silver nanoparticle formation was studied with a library of capping agents (branched polyethylenimine [BPEI] of molecular weight [Mw] 10,000 and 25,000, polyvinylpyrrolidone, polyethylene glycol, polyvinylalcohol and citrate) mixed with silver nitrate. The mixture was then exposed to an assortment of light wavelengths (ultraviolet, infrared and simulated solar light) for studying the light-assisted synthesis of nanoparticles...
2017: Nanotechnology, Science and Applications
https://www.readbyqxmd.com/read/29236755/genomic-features-of-candidatus-venteria-ishoeyi-a-new-sulfur-oxidizing-macrobacterium-from-the-humboldt-sulfuretum-off-chile
#17
Alexis Fonseca, Thomas Ishoey, Carola Espinoza, Danilo Pérez-Pantoja, Antonio Manghisi, Marina Morabito, Alexis Salas-Burgos, Víctor A Gallardo
The Humboldt Sulfuretum (HS), in the productive Humboldt Eastern Boundary Current Upwelling Ecosystem, extends under the hypoxic waters of the Peru-Chile Undercurrent (ca. 6°S and ca. 36°S). Studies show that primeval sulfuretums held diverse prokaryotic life, and, while rare today, still sustain species-rich giant sulfur-oxidizing bacterial communities. We here present the genomic features of a new bacteria of the HS, "Candidatus Venteria ishoeyi" ("Ca. V. ishoeyi") in the family Thiotrichaceae.Three identical filaments were micro-manipulated from reduced sediments collected off central Chile; their DNA was extracted, amplified, and sequenced by a Roche 454 GS FLX platform...
2017: PloS One
https://www.readbyqxmd.com/read/29219761/the-fate-of-nitrite-and-nitrate-during-anaerobic-digestion
#18
K Ghyselbrecht, A Monballiu, M H Somers, I Sigurnjak, E Meers, L Appels, B Meesschaert
Anaerobic digestion is widely used to produce renewable energy. However, the main drawback is the limited conversion efficiency of organic matter. Applying an advanced oxidation process (AOP) as a digestate post-treatment is able to increase this conversion efficiency but will also lead to the oxidation of ammonium to nitrite or nitrate. In this lab scale study, the fate of the latter in the digester was investigated. Nitrite and nitrate were therefore added in concentrations that could arise from rate limiting ammonium concentrations (1...
December 8, 2017: Environmental Technology
https://www.readbyqxmd.com/read/29216573/nitrogen-removal-performance-and-microbial-community-changes-in-subsurface-wastewater-infiltration-systems-swiss-at-low-temperature-with-different-bioaugmentation-strategies
#19
Chunjing Liu, Jianzhi Xie, Manli Song, Zhiling Gao, Dongxing Zheng, Xia Liu, Guohui Ning, Xu Cheng, Harry Bruning
Poor nitrogen removal efficiency (mainly nitrate, NO3--N) at low temperatures strongly limits application of subsurface wastewater infiltration systems (SWISs). Seven psychrophilic strains (heterotrophic nitrifying bacteria and aerobic denitrifying bacteria) were isolated and added to SWISs to investigate the effect of embedding and direct-dosing bioaugmentation strategies on sewage treatment performance at low temperature. Both bioaugmentation strategies improved ammonium (NH4+-N) removal efficiencies, and the embedding strategy also exhibited satisfactory NO3--N and total nitrogen (TN) removal efficiencies...
December 2, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/29205124/shewanella-carassii-sp-nov-isolated-from-surface-swabs-of-crucian-carp-and-faeces-of-a-diarrhoea-patient
#20
Yujie Fang, Yonglu Wang, Zongdong Liu, Binghuai Lu, Hang Dai, Biao Kan, Duochun Wang
Two strains, 08MAS2251T and LZ2016-166, were isolated from diverse samples in China collected from the surface of crucian carp and the faeces of a diarrhoea patient, respectively. Both strains were pink-orange coloured, Gram-negative, oxidase- and catalase-positive, facultative anaerobic and motile bacteria, produced H2S and reduced nitrates to nitrites. Growth occurred in the presence of 0-9 % (w/v) NaCl and at 10-42 °C. The optimum conditions were with 1 % (w/v) NaCl and at 35 °C. The phylogenetic tree of 16S rRNA gene demonstrated that strains 08MAS2251T and LZ2016-166 clustered in a distinctive clade next to the species Shewanella chilikensis JC5T within the genus Shewanella...
December 5, 2017: International Journal of Systematic and Evolutionary Microbiology
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