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https://www.readbyqxmd.com/read/28544522/metagenomic-potential-for-and-diversity-of-n-cycle-driving-microorganisms-in-the-bothnian-sea-sediment
#1
Olivia Rasigraf, Julia Schmitt, Mike S M Jetten, Claudia Lüke
The biological nitrogen cycle is driven by a plethora of reactions transforming nitrogen compounds between various redox states. Here, we investigated the metagenomic potential for nitrogen cycle of the in situ microbial community in an oligotrophic, brackish environment of the Bothnian Sea sediment. Total DNA from three sediment depths was isolated and sequenced. The characterization of the total community was performed based on 16S rRNA gene inventory using SILVA database as reference. The diversity of diagnostic functional genes coding for nitrate reductases (napA;narG), nitrite:nitrate oxidoreductase (nxrA), nitrite reductases (nirK;nirS;nrfA), nitric oxide reductase (nor), nitrous oxide reductase (nosZ), hydrazine synthase (hzsA), ammonia monooxygenase (amoA), hydroxylamine oxidoreductase (hao), and nitrogenase (nifH) was analyzed by blastx against curated reference databases...
May 23, 2017: MicrobiologyOpen
https://www.readbyqxmd.com/read/28541387/chronic-postsurgical-pain-in-the-evaluation-of-nitrous-oxide-in-the-gas-mixture-for-anaesthesia-enigma-ii-trial
#2
(no author information available yet)
No abstract text is available yet for this article.
May 23, 2017: British Journal of Anaesthesia
https://www.readbyqxmd.com/read/28539929/nitrogen-cycling-from-increased-soil-organic-carbon-contributes-both-positively-and-negatively-to-ecosystem-services-in-wheat-agro-ecosystems
#3
Jeda Palmer, Peter J Thorburn, Jody S Biggs, Estelle J Dominati, Merv E Probert, Elizabeth A Meier, Neil I Huth, Mike Dodd, Val Snow, Joshua R Larsen, William J Parton
Soil organic carbon (SOC) is an important and manageable property of soils that impacts on multiple ecosystem services through its effect on soil processes such as nitrogen (N) cycling and soil physical properties. There is considerable interest in increasing SOC concentration in agro-ecosystems worldwide. In some agro-ecosystems, increased SOC has been found to enhance the provision of ecosystem services such as the provision of food. However, increased SOC may increase the environmental footprint of some agro-ecosystems, for example by increasing nitrous oxide emissions...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28537019/nitrous-oxide-production-and-mrna-expression-analysis-of-nitrifying-and-denitrifying-bacterial-genes-under-floodwater-disappearance-and-fertilizer-application
#4
Shohei Riya, Yuki Takeuchi, Sheng Zhou, Akihiko Terada, Masaaki Hosomi
A pulse of nitrous oxide (N2O) emission has been observed following the disappearance of floodwater by drainage. However, its mechanism is not well understood. We conducted a column study to clarify the mechanism for N2O production during floodwater disappearance by using a microsensor and determining the bacterial gene expression. An increase in N2O flux was observed following floodwater disappearance after the addition of NH4(+), with a corresponding increase in the concentrations of NO3(-) and dissolved N2O in the oxic and anoxic soil layers, respectively...
May 23, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28531861/greenhouse-gases-from-membrane-bioreactors-mathematical-modelling-sensitivity-and-uncertainty-analysis
#5
Giorgio Mannina, Alida Cosenza, George A Ekama
In this study a new mathematical model to quantify greenhouse gas emissions (namely, carbon dioxide and nitrous oxide) from membrane bioreactors (MBRs) is presented. The model has been adopted to predict the key processes of a pilot plant with pre-denitrification MBR scheme, filled with domestic and saline wastewater. The model was calibrated by adopting an advanced protocol based on an extensive dataset. In terms of nitrous oxide, the results show that an important role is played by the half saturation coefficients related to nitrogen removal processes and the model factors affecting the oxygen transfer rate in the aerobic and MBR tanks...
May 6, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28528874/animal-health-and-greenhouse-gas-intensity-the-paradox-of-periparturient-parasitism
#6
J G M Houdijk, B J Tolkamp, J A Rooke, M R Hutchings
Here we provide the first known direct measurements of pathogen challenge impacts on greenhouse gas (GHG) production, yield and intensity. Twin-rearing ewes were ad libitum fed pelleted lucerne from day -32 to 36 (day 0 is parturition), and repeatedly infected with 10,000 Teladorsagia circumcincta infective larvae (n=16), or sham-dosed with water (n=16). A third group of 16 ewes were fed at 80% of uninfected ewes' feed intake during lactation. Methane emissions were measured in respiration chambers (day 30 to -36) whilst total tract apparent nutrient digestibility around day 28 informed calculated manure methane and nitrous oxide emissions estimates...
May 18, 2017: International Journal for Parasitology
https://www.readbyqxmd.com/read/28511452/the-effect-of-entonox-on-labour-pain-relief-among-nulliparous-women-a-randomized-controlled-trial
#7
Parisa Parsa, Nafiseh Saeedzadeh, Ghodratallah Roshanaei, Fatameh Shobeiri, Faryar Hakemzadeh
INTRODUCTION: Labour pain is one of the most severe pain in humans. Fear of labour pain is the most dreadful reason for Caesarean Section (CS). Entonox (a mixture of nitrous oxide+oxygen) is a safe inhalational analgesia during labour pain. AIM: This study investigated the effect of entonox on pain relief and length of labour in nulliparous women. MATERIALS AND METHODS: A clinical trial study was conducted among 120 nulliparous women (60 in intervention and 60 in control group) in 2015 in Atieh Hospital, Hamadan city, Iran...
March 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28509799/nitrous-oxide-from-a-peach-of-a-specialist-j-warren-worcester-m-d
#8
(no author information available yet)
No abstract text is available yet for this article.
June 2017: Anesthesiology
https://www.readbyqxmd.com/read/28509797/extending-the-anesthetic-duration-of-nitrous-oxide-with-valerian-an-herbal-sedative
#9
(no author information available yet)
No abstract text is available yet for this article.
June 2017: Anesthesiology
https://www.readbyqxmd.com/read/28509546/growth-of-nitrosococcus-related-ammonia-oxidizing-bacteria-coincides-with-extremely-low-ph-values-in-high-strength-nitrogen-wastewater
#10
Alexandra Fumasoli, Helmut Buergmann, David G Weissbrodt, George F Wells, Karin Beck, Joachim Mohn, Eberhard Morgenroth, Kai M Udert
Ammonia oxidation decreases the pH in wastewaters where the alkalinity is limited relative to the total ammonia. The activity of ammonia oxidizing bacteria (AOB), however, typically decreases with pH and often ceases completely in slightly acidic wastewaters. Nevertheless, low pH nitrification has been reported in reactors treating human urine, but it is not clear which organisms are involved. In this study, we followed the population dynamics of ammonia oxidizing organisms and reactor performance in synthetic, synthetic fully hydrolysed urine as the pH decreased over time in response to a decrease in the loading rate...
May 16, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28505434/photolysis-of-particulate-nitrate-as-a-source-of-hono-and-nox
#11
Chunxiang Ye, Ning Zhang, Honglian Gao, Xianliang Zhou
Photolysis of nitric acid on the surface has been found recently to be greatly enhanced from that in the gas phase. Yet, photolysis of particulate nitrate (pNO3) associated with atmospheric aerosols is still relatively unknown. Here, aerosol filter samples were collected both near the ground surface and throughout the troposphere on board NSF/NACR C-130 aircraft. The photolysis rate constants of pNO3 were determined from these samples by directly monitoring the production rates of nitrous acid (HONO) and nitrogen dioxide (NO2) under UV light (> 290 nm) irradiation...
May 15, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28502779/microeukaryote-community-in-a-partial-nitritation-reactor-prior-to-anammox-and-an-insight-into-the-potential-of-ciliates-as-performance-bioindicators
#12
Oriol Canals, Ramon Massana, Joan Lluís Riera, Vanessa Balagué, Humbert Salvadó
An in-depth, long-term, multidisciplinary study was conducted in order to study the microeukaryote community in a partial nitritation (PN) reactor prior to anammox. The PN reactor operated with moving bed biofilm reactor (MBBR) technology, using plastic supports (carriers) for biofilm development. The microeukaryote community from the biofilm (BF) and the surrounding media (mixed liquor or ML) were analysed separately. Despite the physicochemical conditions under which the PN-MBBR operated (an average of 305...
May 11, 2017: New Biotechnology
https://www.readbyqxmd.com/read/28499181/influence-of-temperature-and-ph-on-the-anammox-process-a-review-and-meta-analysis
#13
REVIEW
Mariusz Tomaszewski, Grzegorz Cema, Aleksandra Ziembińska-Buczyńska
The anammox (anaerobic ammonium oxidation) process was considered a very efficient and economic wastewater treatment technology immediately after its discovery in 1995, thus research in this field was intensified. The anammox process is characterised by a high temperature optimum and is very sensitive to both temperature and pH fluctuations. The process can also be inhibited by many factors, including by its substrates, i.e. nitrite and ammonium (or its unionised forms: free ammonia and free nitrous acid). This paper presents a comprehensive study of the most important and recent findings on the influence of two parameters that are crucial in wastewater treatment, i...
May 2, 2017: Chemosphere
https://www.readbyqxmd.com/read/28497520/nitrous-oxide-for-procedural-analgesia-at-home-in-a-child-with-epidermolysis-bullosa
#14
Pablo Ingelmo, Andrew Wei, Gonzalo Rivera
Epidermolysis bullosa comprises a range of conditions characterized by fragile skin with painful blistering induced by minor trauma and friction. The Dowling-Meara variant is a severe form characterized by disseminated painful blistering requiring lifelong skin and wound care. The natural history of the disease is characterized by a chronic course that tends to improve with advancing age. Various multimodal analgesic strategies have been proposed for painful procedures in children with epidermolysis bullosa...
May 11, 2017: Paediatric Anaesthesia
https://www.readbyqxmd.com/read/28493368/microbial-nitrous-oxide-emissions-in-dryland-ecosystems-mechanisms-microbiome-and-mitigation
#15
Hang-Wei Hu, Pankaj Trivedi, Ji-Zheng He, Brajesh K Singh
Globally, drylands represent the largest terrestrial biome and are projected to expand by 23% by the end of this century. Drylands are characterized by extremely low levels of water and nutrients and exhibit highly heterogeneous distribution in plants and biocrusts which make microbial processes shaping the dryland functioning rather unique compared with other terrestrial ecosystems. Nitrous oxide (N2 O) is a powerful greenhouse gas with ozone depletion potential. Despite of the pivotal influences of microbial communities on the production and consumption of N2 O, we have limited knowledge of the biological pathways and mechanisms underpinning N2 O emissions from drylands, which are estimated to account for 30% of total gaseous nitrogen emissions on Earth...
May 10, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28492195/evaluation-of-nitrous-oxide-oxygen-and-triclofos-sodium-as-conscious-sedative-agents
#16
Priya Subramaniam, K L Girish Babu, Disha Lakhotia
BACKGROUND: Conscious sedation is used in the pediatric dentistry to reduce fear and anxiety in children and promote favorable treatment outcomes. To achieve them, the primary clinical need is for a well-tolerated, effective, and expedient analgesic and sedative agent that is safe to use. AIM: The aim of the present study was to evaluate the efficacy of nitrous oxide-oxygen and triclofos sodium as conscious sedative agents in 5-10-year-old children. METHODOLOGY: Sixty children aged 5-10 years showing anxious, uncooperative, and apprehensive behavior were randomly divided and assigned into two groups (Groups A and B) such that Group A received 40% nitrous oxide-60% oxygen and Group B received triclofos sodium in the dose of 70 mg/kg body weight, given 30 min before the treatment procedure...
April 2017: Journal of the Indian Society of Pedodontics and Preventive Dentistry
https://www.readbyqxmd.com/read/28482116/pollution-tolerant-invertebrates-enhance-greenhouse-gas-flux-in-urban-wetlands
#17
Andrew S Mehring, Perran L M Cook, Victor Evrard, Stanley B Grant, Lisa A Levin
One of the goals of urban ecology is to link community structure to ecosystem function in urban habitats. Pollution-tolerant wetland invertebrates have been shown to enhance greenhouse gas (GHG) flux in controlled laboratory experiments, suggesting that they may influence urban wetland roles as sources or sinks of GHG. However, it is unclear if their effects can be detected in highly variable conditions in a field setting. Here we use an extensive dataset on carbon dioxide (CO2 ), methane (CH4 ), and nitrous oxide (N2 O) flux in sediment cores (n = 103) collected from ten urban wetlands in Melbourne, Australia during summer and winter in order to test for invertebrate enhancement of GHG flux...
May 8, 2017: Ecological Applications: a Publication of the Ecological Society of America
https://www.readbyqxmd.com/read/28481923/nitrapyrin-addition-mitigates-nitrous-oxide-emissions-and-raises-nitrogen-use-efficiency-in-plastic-film-mulched-drip-fertigated-cotton-field
#18
Tao Liu, Yongchao Liang, Guixin Chu
Nitrification inhibitors (NIs) have been used extensively to reduce nitrogen losses and increase crop nitrogen nutrition. However, information is still scant regarding the influence of NIs on nitrogen transformation, nitrous oxide (N2O) emission and nitrogen utilization in plastic-film-mulched calcareous soil under high frequency drip-fertigated condition. Therefore, a field trial was conducted to evaluate the effect of nitrapyrin (2-chloro-6-(trichloromethyl)-pyridine) on soil mineral nitrogen (N) transformation, N2O emission and nitrogen use efficiency (NUE) in a drip-fertigated cotton-growing calcareous field...
2017: PloS One
https://www.readbyqxmd.com/read/28476240/effect-of-free-ammonium-and-free-nitrous-acid-on-the-activity-aggregate-morphology-and-eps-distribution-of-ammonium-oxidizing-bacteria-in-partial-nitrification
#19
Qian Yao, Dangcong Peng, Bo Wang, Yuanyuan Chen, Jiaqi Li, Qiaodi Zhao, Binbin Wang
Successful partial nitrification not only guarantees the inhibition of nitrite oxidation, but also does not excessively retard the ammonia oxidation rate. Therefore, the performance of ammonium oxidizing bacteria (AOB) during partial nitrification is fundamental to this process. In this study, two lab-scale partial nitrification bioreactors containing different inhibition conditions-one with free ammonium (FA) inhibition, the other with free nitrous acid (FNA) inhibition-were used to compare the differences between activity, quantity, aggregation morphology and extracellular polymeric substance (EPS) distribution of AOB...
May 2, 2017: Journal of Bioscience and Bioengineering
https://www.readbyqxmd.com/read/28475231/successful-use-of-nitrous-oxide-during-lumbar-punctures-a-call-for-nitrous-oxide-in-pediatric-oncology-clinics
#20
Mylynda Livingston, Miranda Lawell, Nancy McAllister
Numerous reports describe the successful use of nitrous oxide for analgesia in children undergoing painful procedures. Although shown to be safe, effective, and economical, nitrous oxide use is not yet common in pediatric oncology clinics and few reports detail its effectiveness for children undergoing repeated lumbar punctures. We developed a nitrous oxide clinic, and undertook a review of pediatric oncology lumbar puncture records for those patients receiving nitrous oxide in 2011. No major complications were noted...
May 5, 2017: Pediatric Blood & Cancer
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