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Nitrate reducing bacteria

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https://www.readbyqxmd.com/read/28071009/evolution-of-free-amino-acids-biogenic-amines-and-n-nitrosoamines-throughout-ageing-in-organic-fermented-beef
#1
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
#2
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
#3
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
#4
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
#5
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
#6
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
#7
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
#8
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
#9
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
#10
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
#11
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
#12
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
#13
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
#14
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
https://www.readbyqxmd.com/read/27810735/profound-differences-between-humans-and-rodents-in-the-ability-to-concentrate-salivary-nitrate-implications-for-translational-research
#15
Marcelo F Montenegro, Michaela L Sundqvist, Carina Nihlén, Michael Hezel, Mattias Carlström, Eddie Weitzberg, Jon O Lundberg
In humans dietary circulating nitrate accumulates rapidly in saliva through active transport in the salivary glands. By this mechanism resulting salivary nitrate concentrations are 10-20 times higher than in plasma. In the oral cavity nitrate is reduced by commensal bacteria to nitrite, which is subsequently swallowed and further metabolized to nitric oxide (NO) and other bioactive nitrogen oxides in blood and tissues. This entero-salivary circulation of nitrate is central in the various NO-like effects observed after ingestion of inorganic nitrate...
October 25, 2016: Redox Biology
https://www.readbyqxmd.com/read/27781173/green-synthesis-of-silver-nanoparticles-in-aloe-vera-plant-extract-prepared-by-a-hydrothermal-method-and-their-synergistic-antibacterial-activity
#16
Patcharaporn Tippayawat, Nutthakritta Phromviyo, Parichart Boueroy, Apiwat Chompoosor
BACKGROUND: There is worldwide interest in silver nanoparticles (AgNPs) synthesized by various chemical reactions for use in applications exploiting their antibacterial activity, even though these processes exhibit a broad range of toxicity in vertebrates and invertebrates alike. To avoid the chemical toxicity, biosynthesis (green synthesis) of metal nanoparticles is proposed as a cost-effective and environmental friendly alternative. Aloe vera leaf extract is a medicinal agent with multiple properties including an antibacterial effect...
2016: PeerJ
https://www.readbyqxmd.com/read/27769826/effects-of-antiseptic-mouthwash-on-resting-metabolic-rate-a-randomized-double-blind-crossover-study
#17
Michaela L Sundqvist, Jon O Lundberg, Eddie Weitzberg
The nitrate-nitrite-nitric oxide pathway has emerged as a significant source of nitric oxide (NO) bioactivity. Dietary intake of inorganic nitrate has a number of cardiovascular effects as well as a decrease in oxygen cost during exercise and a reduction in resting metabolic rate (RMR). Oral bacteria have a key role in bioactivation of inorganic nitrate since they catalyse the conversion of salivary nitrate to the more reactive nitrite anion. Recent studies demonstrate that blood pressure increases with the use of an antiseptic mouthwash, indicating that endogenous, NO-synthase derived nitrate is recycled into nitrite and NO, sufficiently to modulate cardiovascular function...
October 18, 2016: Nitric Oxide: Biology and Chemistry
https://www.readbyqxmd.com/read/27708623/biostimulation-of-indigenous-microbial-community-for-bioremediation-of-petroleum-refinery-sludge
#18
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/27699705/kinetics-of-nitrous-oxide-n2o-formation-and-reduction-by-paracoccus-pantotrophus
#19
B L Read-Daily, F Sabba, J P Pavissich, R Nerenberg
Nitrous oxide (N2O) is a powerful greenhouse gas emitted from wastewater treatment, as well as natural systems, as a result of biological nitrification and denitrification. While denitrifying bacteria can be a significant source of N2O, they can also reduce N2O to N2. More information on the kinetics of N2O formation and reduction by denitrifying bacteria is needed to predict and quantify their impact on N2O emissions. In this study, kinetic parameters were determined for Paracoccus pantotrophus, a common denitrifying bacterium...
December 2016: AMB Express
https://www.readbyqxmd.com/read/27693238/synthesis-and-characterization-of-nanosilver-silicone-hydrogel-composites-for-inhibition-of-bacteria-growth
#20
F M Helaly, S M El-Sawy, A I Hashem, A A Khattab, R M Mourad
PURPOSE: Nanosilver-silicone hydrogel (NAgSiH) composites for contact lenses were synthesized to asses the antimicrobial effects. METHODS: Silicone hydrogel (SiH) films were synthesized followed by impregnation in silver nitrate solutions (10, 20, 30, 40, 60, 80ppm) and in-situ chemical reduction of silver ions using sodium borohydride (NaBH4). The silver nano particles (AgNPS) were identified by UV-vis absorption spectroscopy, Energy-dispersive X-ray spectroscopy (EDX) mapping and EDX spectrum...
February 2017: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
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