keyword
MENU ▼
Read by QxMD icon Read
search

Nitrate reducing bacteria

keyword
https://www.readbyqxmd.com/read/28217926/reduction-oxidation-cycles-of-organic-matter-increase-bacterial-activity-in-the-pelagic-oxycline
#1
Maximilian P Lau, Michael Hupfer, Hans Peter Grossart
Dissolved organic matter (DOM) in aquatic ecosystems contains redox-active moieties, which are prone to oxidation and reduction reactions. Oxidized moieties feature reduction potentials Eh , so that the moieties may be used as terminal electron acceptors (TEAs) in microbial respiration with a thermodynamic energy yield between nitrate and sulfate reduction. Here, we study the response of pelagic freshwater bacteria to exposure to native DOM with varying availabilities of oxidized moieties and hence redox state...
February 20, 2017: Environmental Microbiology Reports
https://www.readbyqxmd.com/read/28214440/achieving-short-cut-nitrification-and-denitrification-in-modified-intermittently-aerated-constructed-wetland
#2
Jie Hou, Ling Xia, Tao Ma, Yiqing Zhang, Yiyong Zhou, Xugang He
This study aim to enhance nitrogen removal performance via shifting nitrogen removal pathway from nitrate to nitrite pathway. It was demonstrated that nitrite pathway was successfully and stably achieved in CWs by using modified intermittent aeration control with aeration 20min/non-aeration 100min and reducing DO concentration during aeration, nitrite in the effluent could accumulate to over 70% of the total oxidized nitrogen. Q-PCR analysis showed that nitrifying microbial communities were optimized under the alternating anoxic and aerobic conditions, ammonia oxidizing bacteria increased from 7...
February 10, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28197141/metabolomic-and-metagenomic-analysis-of-two-crude-oil-production-pipelines-experiencing-differential-rates-of-corrosion
#3
Vincent Bonifay, Boris Wawrik, Jan Sunner, Emily C Snodgrass, Egemen Aydin, Kathleen E Duncan, Amy V Callaghan, Athenia Oldham, Turid Liengen, Iwona Beech
Corrosion processes in two North Sea oil production pipelines were studied by analyzing pig envelope samples via metagenomic and metabolomic techniques. Both production systems have similar physico-chemical properties and injection waters are treated with nitrate, but one pipeline experiences severe corrosion and the other does not. Early and late pigging material was collected to gain insight into the potential causes for differential corrosion rates. Metabolites were extracted and analyzed via ultra-high performance liquid chromatography/high-resolution mass spectrometry with electrospray ionization (ESI) in both positive and negative ion modes...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28194258/complete-genome-sequence-of-pseudomonas-stutzeri-strain-rch2-isolated-from-a-hexavalent-chromium-cr-vi-contaminated-site
#4
Romy Chakraborty, Hannah Woo, Paramvir Dehal, Robert Walker, Marcin Zemla, Manfred Auer, Lynne A Goodwin, Alexey Kazakov, Pavel Novichkov, Adam P Arkin, Terry C Hazen
Hexavalent Chromium [Cr(VI)] is a widespread contaminant found in soil, sediment, and ground water in several DOE sites, including Hanford 100 H area. In order to stimulate microbially mediated reduction of Cr(VI) at this site, a poly-lactate hydrogen release compound was injected into the chromium contaminated aquifer. Targeted enrichment of dominant nitrate-reducing bacteria post injection resulted in the isolation of Pseudomonas stutzeri strain RCH2. P. stutzeri strain RCH2 was isolated using acetate as the electron donor and is a complete denitrifier...
2017: Standards in Genomic Sciences
https://www.readbyqxmd.com/read/28168224/lifestyle-and-horizontal-gene-transfer-mediated-evolution-of-mucispirillum-schaedleri-a-core-member-of-the-murine-gut-microbiota
#5
Alexander Loy, Carina Pfann, Michaela Steinberger, Buck Hanson, Simone Herp, Sandrine Brugiroux, João Carlos Gomes Neto, Mark V Boekschoten, Clarissa Schwab, Tim Urich, Amanda E Ramer-Tait, Thomas Rattei, Bärbel Stecher, David Berry
Mucispirillum schaedleri is an abundant inhabitant of the intestinal mucus layer of rodents and other animals and has been suggested to be a pathobiont, a commensal that plays a role in disease. In order to gain insights into its lifestyle, we analyzed the genome and transcriptome of M. schaedleri ASF 457 and performed physiological experiments to test traits predicted by its genome. Although described as a mucus inhabitant, M. schaedleri has limited capacity for degrading host-derived mucosal glycans and other complex polysaccharides...
January 2017: MSystems
https://www.readbyqxmd.com/read/28124782/azohydromonas-riparia-sp-nov-and-azohydromonas-ureilytica-sp-nov-isolated-from-a-riverside-soil-in-south-korea
#6
Tuan Manh Nguyen, Jaisoo Kim
White and pale yellow coloured bacteria were isolated from the riverside soil, Daejeon, South Korea, and were designated UCM-11(T), UCM-F25, and UCM-80(T). We found that all strains were able to reduce nitrate, and the cells were aerobic and motile. The DNA G+C contents of UCM-11(T), UCM-F25, and UCM-80(T) were between 68.9 to 71.2 mol% and the main ubiquinone was observed as Q-8. Based on16S rRNA gene sequences, strains UCM-11(T) and UCM-F25 were found to closely match with Azohydromonas australica IAM 12664(T) (98...
January 26, 2017: Journal of Microbiology / the Microbiological Society of Korea
https://www.readbyqxmd.com/read/28071009/evolution-of-free-amino-acids-biogenic-amines-and-n-nitrosoamines-throughout-ageing-in-organic-fermented-beef
#7
Karolina M Wójciak, Elżbieta Solska
BACKGROUND: In recent years, interest in uncured meat products has grown and studies were carried out on the use of substances which could replace nitrites, such as acid whey. In spite of this problem in fermented meat products, there is no information regarding the effects of prolonged ageing on the formation of chemical (nitrosoamines, biogenic amines, secondary lipid oxidation products) and microbiological (L. monocytogenes, S. aureus, OLD) toxicants in fermented beef marinated with acid whey...
April 2016: Acta Scientiarum Polonorum. Technologia Alimentaria
https://www.readbyqxmd.com/read/28056221/nitratireductor-aestuarii-sp-nov-a-marine-alphaproteobacterium-isolated-from-estuary-of-jiulong-river-of-southeast-of-china
#8
Danyun Ou, Hao Huang, Renao Bai, Qingge Li, Yanan Wang, Yajie Yin
Two bacterial strains 2-2-12-1T and 2-2-12-2 were isolated from the estuary of the Jiulong River of southeast of China. The cells were Gram-negative, non-motile, short rods without flagella. Growth occurred at 25-45 ºC, pH 5.0-9.0, and 0.5-2% NaCl. The bacteria were unable to reduce nitrate. The predominant fatty acids were C19: 0 cyclo ω9c and C18: 1 ω7c. Phylogenetic analysis based on the 16S rRNA gene sequences showed that both strains belong to the genus Nitratireductor, family Phyllobacteriaceae, class Alphaproteobacteria...
January 4, 2017: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/28050844/microbial-nitrate-removal-by-waste-iron-shavings-from-the-biological-and-catalytic-ozonation-treated-dyeing-and-finishing-wastewater
#9
Jieting Ma, Yunlu Chen, Gang Luo, Jianxin Nie, Zhigang Guo, Yan Liu, Luming Ma
The concentration of total nitrogen (TN) (between 40 and 60 mg/L, mainly nitrate) in the biological and catalytic ozonation treated dyeing and finishing wastewater needs to be reduced before discharge. The present study investigated the feasibility of using waste iron shavings as electron donor for nitrogen removal by biological denitrification. Two anoxic sequencing batch reactors (AnSBR) were continuously operated for more than 100 days. The results showed that the TN removal efficiency increased from 12% in the control reactor (AnSBR-C) to 20% in the reactor with waste iron shavings (AnSBR-Fe)...
December 2017: AMB Express
https://www.readbyqxmd.com/read/28041535/enrichment-culture-of-denitrifying-phosphorus-removal-sludge-and-its-microbial-community-analysis
#10
Hongliang Dai, Xiwu Lu, Lihong Peng, Xiang Li, Zheqin Dai
An efficient one-step domestication method with mixed electron acceptors and short time post-aeration was developed for the enrichment culture of denitrifying phosphorus removal sludge. The acclimation time, performance of nitrogen and phosphorus simultaneous removal and microbial community structure were investigated to reveal the difference among the obtained phosphorus removal sludge using different acclimation ways. Results showed that the proposed method with optimal proportion of nitrite and nitrate could significantly shorten domestication time (28 d) compared with the traditional two-step method (60 d), but exerted nearly no influence on the removal efficiency of nitrogen and phosphorus...
January 2, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28040856/dissecting-the-role-of-ntrc-and-rpon-in-the-expression-of-assimilatory-nitrate-and-nitrite-reductases-in-bradyrhizobium-diazoefficiens
#11
María F López, Juan J Cabrera, Ana Salas, María J Delgado, Silvina L López-García
Bradyrhizobium diazoefficiens, a nitrogen-fixing endosymbiont of soybeans, is a model strain for studying rhizobial denitrification. This bacterium can also use nitrate as the sole nitrogen (N) source during aerobic growth by inducing an assimilatory nitrate reductase encoded by nasC located within the narK-bjgb-flp-nasC operon along with a nitrite reductase encoded by nirA at a different chromosomal locus. The global nitrogen two-component regulatory system NtrBC has been reported to coordinate the expression of key enzymes in nitrogen metabolism in several bacteria...
December 31, 2016: Antonie Van Leeuwenhoek
https://www.readbyqxmd.com/read/27959949/chinese-milk-vetch-as-green-manure-mitigates-nitrous-oxide-emission-from-monocropped-rice-system-in-south-china
#12
Zhijian Xie, Farooq Shah, Shuxin Tu, Changxu Xu, Weidong Cao
Monocropped rice system is an important intensive cropping system for food security in China. Green manure (GM) as an alternative to fertilizer N (FN) is useful for improving soil quality. However, few studies have examined the effect of Chinese milk vetch (CMV) as GM on nitrous oxide (N2O) emission from monocropped rice field in south China. Therefore, a pot-culture experiment with four treatments (control, no FN and CMV; CMV as GM alone, M; fertilizer N alone, FN; integrating fertilizer N with CMV, NM) was performed to investigate the effect of incorporating CMV as GM on N2O emission using a closed chamber-gas chromatography (GC) technique during the rice growing periods...
2016: PloS One
https://www.readbyqxmd.com/read/27884109/cloning-functional-expression-and-characterization-of-a-bifunctional-3-hydroxybutanal-dehydrogenase-reductase-involved-in-acetone-metabolism-by-desulfococcus-biacutus
#13
Jasmin Frey, Hendrik Rusche, Bernhard Schink, David Schleheck
BACKGROUND: The strictly anaerobic, sulfate-reducing bacterium Desulfococcus biacutus can utilize acetone as sole carbon and energy source for growth. Whereas in aerobic and nitrate-reducing bacteria acetone is activated by carboxylation with CO2 to acetoacetate, D. biacutus involves CO as a cosubstrate for acetone activation through a different, so far unknown pathway. Proteomic studies indicated that, among others, a predicted medium-chain dehydrogenase/reductase (MDR) superfamily, zinc-dependent alcohol dehydrogenase (locus tag DebiaDRAFT_04514) is specifically and highly produced during growth with acetone...
November 25, 2016: BMC Microbiology
https://www.readbyqxmd.com/read/27881860/in-situ-restoration-of-one-stage-partial-nitritation-anammox-process-deteriorated-by-nitrate-build-up-via-elevated-substrate-levels
#14
Xiaolong Wang, Dawen Gao
The one-stage partial nitritation and anammox process (PN/A) has been a promising microbial process to remove ammonia from wastewater especially with low carbon/nitrogen ratio. The main breakdown was the deterioration caused by overgrowth of nitrite oxidizing bacteria (NOB) resulting effluent nitrate build-up in the PN/A process. This study presented an in-situ restoring strategy for suppressing NOB activity in a one-stage granular PN/A system deteriorated over 2 months, using elevated concentrations of substrates (ammonia and nitrite) under limited dissolved oxygen level...
November 24, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27877167/polycyclic-aromatic-hydrocarbon-induced-changes-in-bacterial-community-structure-under-anoxic-nitrate-reducing-conditions
#15
Sophie-Marie Martirani-Von Abercron, Daniel Pacheco, Patricia Benito-Santano, Patricia Marín, Silvia Marqués
Although bacterial anaerobic degradation of mono-aromatic compounds has been characterized in depth, the degradation of polycyclic aromatic hydrocarbons (PAHs) such as naphthalene has only started to be understood in sulfate reducing bacteria, and little is known about the anaerobic degradation of PAHs in nitrate reducing bacteria. Starting from a series of environments which had suffered different degrees of hydrocarbon pollution, we used most probable number (MPN) enumeration to detect and quantify the presence of bacterial communities able to degrade several PAHs using nitrate as electron acceptor...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27872324/from-nitrate-to-nitric-oxide-the-role-of-salivary-glands-and-oral-bacteria
#16
X M Qu, Z F Wu, B X Pang, L Y Jin, L Z Qin, S L Wang
The salivary glands and oral bacteria play an essential role in the conversion process from nitrate (NO3(-)) and nitrite (NO2(-)) to nitric oxide (NO) in the human body. NO is, at present, recognized as a multifarious messenger molecule with important vascular and metabolic functions. Besides the endogenous L-arginine pathway, which is catalyzed by complex NO synthases, nitrate in food contributes to the main extrinsic generation of NO through a series of sequential steps (NO3(-)-NO2(-)-NO pathway). Up to 25% of nitrate in circulation is actively taken up by the salivary glands, and as a result, its concentration in saliva can increase 10- to 20-fold...
December 2016: Journal of Dental Research
https://www.readbyqxmd.com/read/27857202/napb-in-excess-inhibits-growth-of-shewanella-oneidensis-by-dissipating-electrons-of-the-quinol-pool
#17
Miao Jin, Qianyun Zhang, Yijuan Sun, Haichun Gao
Shewanella, a group of ubiquitous bacteria renowned for respiratory versatility, thrive in environments where various electron acceptors (EAs) of different chemical and physiological characteristics coexist. Despite being extensively studied, we still know surprisingly little about strategies by which multiple EAs and their interaction define ecophysiology of these bacteria. Previously, we showed that nitrite inhibits growth of the genus representative Shewanella oneidensis on fumarate and presumably some other CymA (quinol dehydrogenase)-dependent EAs by reducing cAMP production, which in turn leads to lowered expression of nitrite and fumarate reductases...
November 18, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27847498/intracellular-nitrate-of-marine-diatoms-as-a-driver-of-anaerobic-nitrogen-cycling-in-sinking-aggregates
#18
Anja Kamp, Peter Stief, Laura A Bristow, Bo Thamdrup, Ronnie N Glud
Diatom-bacteria aggregates are key for the vertical transport of organic carbon in the ocean. Sinking aggregates also represent pelagic microniches with intensified microbial activity, oxygen depletion in the center, and anaerobic nitrogen cycling. Since some of the aggregate-forming diatom species store nitrate intracellularly, we explored the fate of intracellular nitrate and its availability for microbial metabolism within anoxic diatom-bacteria aggregates. The ubiquitous nitrate-storing diatom Skeletonema marinoi was studied as both axenic cultures and laboratory-produced diatom-bacteria aggregates...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27822557/migraines-are-correlated-with-higher-levels-of-nitrate-nitrite-and-nitric-oxide-reducing-oral-microbes-in-the-american-gut-project-cohort
#19
Antonio Gonzalez, Embriette Hyde, Naseer Sangwan, Jack A Gilbert, Erik Viirre, Rob Knight
Nitrates, such as cardiac therapeutics and food additives, are common headache triggers, with nitric oxide playing an important role. Facultative anaerobic bacteria in the oral cavity may contribute migraine-triggering levels of nitric oxide through the salivary nitrate-nitrite-nitric oxide pathway. Using high-throughput sequencing technologies, we detected observable and significantly higher abundances of nitrate, nitrite, and nitric oxide reductase genes in migraineurs versus nonmigraineurs in samples collected from the oral cavity and a slight but significant difference in fecal samples...
September 2016: MSystems
https://www.readbyqxmd.com/read/27812355/abundance-and-diversity-of-denitrifying-and-anammox-bacteria-in-seasonally-hypoxic-and-sulfidic-sediments-of-the-saline-lake-grevelingen
#20
Yvonne A Lipsewers, Ellen C Hopmans, Filip J R Meysman, Jaap S Sinninghe Damsté, Laura Villanueva
Denitrifying and anammox bacteria are involved in the nitrogen cycling in marine sediments but the environmental factors that regulate the relative importance of these processes are not well constrained. Here, we evaluated the abundance, diversity, and potential activity of denitrifying, anammox, and sulfide-dependent denitrifying bacteria in the sediments of the seasonally hypoxic saline Lake Grevelingen, known to harbor an active microbial community involved in sulfur oxidation pathways. Depth distributions of 16S rRNA gene, nirS gene of denitrifying and anammox bacteria, aprA gene of sulfur-oxidizing and sulfate-reducing bacteria, and ladderane lipids of anammox bacteria were studied in sediments impacted by seasonally hypoxic bottom waters...
2016: Frontiers in Microbiology
keyword
keyword
61141
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"