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Nitrates

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https://www.readbyqxmd.com/read/29150761/comparative-study-of-fluvial-lakes-in-floodplains-of-the-elbe-lu%C3%A5-nice-and-svratka-rivers-based-on-hydrochemical-and-biological-approach
#1
Petra Havlíková, Tomáš Chuman, Bohumír Janský
The aim of the thesis was to specify key differences in chemistry and biota (zooplankton communities) among fluvial lakes in three regions of the Czech Republic: the central part of the Elbe River, the upper part of the Lužnice River and the upper part of the Svratka River. The ten studied lakes of the three regions differ in size, geology, shading, connection with the river and the level of anthropogenic impact. The following hypotheses were tested: (1) The water chemistry of fluvial lakes significantly differs in different floodplains...
November 17, 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/29150508/community-composition-and-ultrastructure-of-a-nitrate-dependent-anaerobic-methane-oxidizing-enrichment-culture
#2
Lavinia Gambelli, Simon Guerrero-Cruz, Rob J Mesman, Geert Cremers, Mike S M Jetten, Huub J M Op den Camp, Boran Kartal, Claudia Lueke, Laura van Niftrik
Methane is a very potent greenhouse gas and can be oxidized aerobically or anaerobically through microbial-mediated processes, thus decreasing methane emissions to the atmosphere. Using a complementary array of methods including phylogenetic analysis, physiological experiments, and light and electron microscopy techniques (including electron tomography), we investigated the community composition and ultrastructure of a continuous bioreactor enrichment culture, in which anaerobic methane oxidation (AOM) was coupled to nitrate reduction...
November 17, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29150355/contribution-of-nitric-oxide-synthase-from-coagulase-negative-staphylococci-to-the-development-of-red-myoglobin-derivatives
#3
Geoffrey Ras, Xavier Bailly, Jean-Paul Chacornac, Véronique Zuliani, Patrick Derkx, Tim M Seibert, Régine Talon, Sabine Leroy
As part of the microbial community of meat or as starter cultures, coagulase-negative staphylococci (CNS) serve several essential technological purposes in meat products, such as color development through the reduction of nitrate to nitrite. As the safety of nitrite as an additive has been questioned, we explored the potential of CNS to develop red myoglobin derivatives such as oxymyoglobin and nitrosomyoglobin. Nitrosoheme was extracted to evaluate NO production. This production could be due to a nitric oxide synthase (NOS) activity...
November 13, 2017: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/29150188/nitrogen-species-coupled-with-transpiration-enhance-fe-plaque-assisted-aquatic-uranium-removal-via-rhizofiltration-of-phragmites-australis-trin-ex-steud
#4
Weiqing Wang, E Gert Dudel
The influences of N species and transpiration on the Fe plaque (IP) formation and related aquatic U rhizofiltration had not revealed yet, especially when these factors were co-existed. It was evaluated in a mesocosm experiment in the condition of respective ammonium (NH4(+))/nitrate (NO3(-)) cultivation of Phragmites australis Trin ex Steud. coupled with different transpiration rates (TRs). The results suggested that the enhanced transpiration of P. australis improved the aquatic U rhizofiltration in both NO3(-) and NH4(+) rich milieus...
November 14, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/29150156/the-efficacy-of-danshen-injection-as-adjunctive-therapy-in-treating-angina-pectoris-a-systematic-review-and-meta-analysis
#5
REVIEW
Huikai Shao, Mengsi Li, Fuchao Chen, Lianghua Chen, Zhengjin Jiang, Lingguo Zhao
BACKGROUND: During the last 40 years, Danshen injection has been widely used as an adjunctive therapy for angina pectoris in China, but its efficacy is not yet well defined. The objective of this study was to verify the efficacy of Danshen injection as adjunctive therapy in treating angina pectoris. METHODS: The major databases including PubMed, Cochrane Library, Sino-Med, Medline, Embase, Google Scholar, China National Knowledge Infrastructure, Wanfang Databases, Chinese Scientific Journal Database, Chinese Biomedical Literature Database and the Chinese Science Citation Database were systematically searched for the published randomised controlled trials (RCTs) on Danshen injection until April 2016...
November 6, 2017: Heart, Lung & Circulation
https://www.readbyqxmd.com/read/29149765/sorption-desorption-of-antimony-species-onto-calcined-hydrotalcite-surface-structure-and-control-of-competitive-anions
#6
Leonel Vinicius Constantino, Juliana Nunes Quirino, Taufik Abrão, Paulo Sérgio Parreira, Alexandre Urbano, Maria Josefa Santos
Calcined hydrotalcite can be applied to remove anionic contaminants from aqueous systems such as antimony species due to its great anion exchange capacity and high surface area. Hence, this study evaluated antimonite and antimonate sorption-desorption processes onto calcined hydrotalcite in the presence of nitrate, sulfate and phosphate. Sorption and desorption experiments of antimonite and antimonate were carried out in batch equilibrium and the post-sorption solids were analyzed by X-ray fluorescence (EDXRF)...
November 10, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29149709/performance-and-microbial-communities-in-a-combined-bioelectrochemical-and-sulfur-autotrophic-denitrification-system-at-low-temperature
#7
Dan Chen, Hongyu Wang, Kai Yang, Fang Ma
Combined bioelectrochemical and sulfur autotrophic denitrification (CBSAD) system had proven to be feasible for nitrate removal at low temperature. This system obtained excellent denitrification efficiency 96.55% at 10 ± 2 °C long term operation. Nitrate removal efficiency presented increased tendency with applied current increased from 50 to 200 mA and then decreased when the applied current was further increased to 300 mA. The CBSAD system owned the most abundant and rich communities at current 200 mA, and the community structures of the microbial samples at different current conditions were clearly different from each other...
November 5, 2017: Chemosphere
https://www.readbyqxmd.com/read/29149708/photodegradation-of-novel-oral-anticoagulants-under-sunlight-irradiation-in-aqueous-matrices
#8
Montaha Yassine, Laura Fuster, Marie-Hélène Dévier, Emmanuel Geneste, Patrick Pardon, Axelle Grélard, Erick Dufourc, Mohamad Al Iskandarani, Selim Aït-Aïssa, Jeanne Garric, Hélène Budzinski, Patrick Mazellier, Aurélien S Trivella
Kinetics of photodegradation of novel oral anticoagulants dabigatran, rivaroxaban, and apixaban were studied under simulated solar light irradiation in purified, mineral, and river waters. Dabigatran and rivaroxaban underwent direct photolysis with polychromatic quantum yields of 2.2 × 10(-4) and 4.4 × 10(-2), respectively. The direct photodegradation of apixaban was not observed after 19 h of irradiation. Kinetics of degradation of rivaroxaban was not impacted by the nature of the aqueous matrix while photosensitization from nitrate ions was observed for dabigatran and apixaban dissolved in a mineral water...
November 9, 2017: Chemosphere
https://www.readbyqxmd.com/read/29148928/spatiotemporal-variations-and-relationship-of-pm-and-gaseous-pollutants-based-on-gray-correlation-analysis
#9
Yong Y Zhang, Ying Jia, Ming Li, Li A Hou
The present work characterizes the spatiotemporal variations of air pollution at four sites in Xi'an city. The investigations lasted for 1 year: January 1 through December 31, 2015. The concentrations of CO, NO2, O3, PM and SO2 were systematically monitored. The gray correlation analysis was used to correlate PM2.5 and gaseous pollutants. The formation mechanisms of sulfate and nitrate aerosols were discussed. Results clearly revealed severe air pollution by PM2.5, PM10 and NO2 at all four sites. Significant monthly variations were observed for PM2...
November 17, 2017: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/29148753/kinetics-of-the-aqueous-phase-reactions-of-atmospherically-relevant-monoterpene-epoxides
#10
Diego A Cortes, Matthew J Elrod
Laboratory and field measurements have demonstrated that an isoprene-derived epoxide intermediate (IEPOX) is the origin of a wide range of chemical species found in ambient secondary organic aerosol (SOA). In order to explore the potential relevance of a similar mechanism for the formation of monoterpene-derived SOA, nuclear magnetic resonance techniques were used to study kinetics and reaction products of the aqueous phase reactions of several monoterpene epoxides: β-pinene oxide, limonene oxide, and limonene dioxide...
November 17, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/29148745/influence-of-counter-cation-hydration-enthalpies-on-the-formation-of-molecular-complexes-a-thorium-nitrate-example
#11
Geng Bang Jin, Jian Lin, Shanna L Estes, Suntharalingam Skanthakumar, Lynda Soderholm
The influence of counter-cations (A(n+)) in directing the composition of monomeric metal-ligand (ML) complexes that precipitate from solution are often overlooked despite the wide usage of A(n+) in materials synthesis. Herein we describe a correlation between the composition of ML complexes and A(+) hydration enthalpies found for two related series of Th-nitrate molecular compounds obtained by evaporating acidic aqueous Th-nitrate solutions in the presence of A(+) counter-ions. Analyses of their chemical composition and solid-state structures demonstrate that A(+) not only affects the overall solid-state packing of the Th-nitrato complexes but also influences the composition of the Th-nitrato monomeric anions themselves...
November 17, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29148619/molten-salt-assisted-self-assembly-synthesis-of-mesoporous-licoo2-and-limn2-o4-thin-films-and-investigation-of-electrocatalytic-water-oxidation-performance-of-lithium-cobaltate
#12
Gülbahar Saat, Fadime Mert Balci, Elif Pınar Alsaç, Ferdi Karadas, Ömer Dag
Mesoporous thin films of transition metal lithiates (TML) belong to an important group of materials for the advancement of electrochemical systems. This study demonstrates a simple one pot method to synthesize the first examples of mesoporous LiCoO2 and LiMn2 O4 thin films. Molten salt assisted self-assembly can be used to establish an easy route to produce mesoporous TML thin films. The salts (LiNO3 and [Co(H2 O)6 ](NO3 )2 or [Mn(H2 O)4 ](NO3 )2 ) and two surfactants (10-lauryl ether and cethyltrimethylammonium bromide (CTAB) or cethyltrimethylammonium nitrate (CTAN)) form stable liquid crystalline mesophases...
November 17, 2017: Small
https://www.readbyqxmd.com/read/29148553/rare-earth-metal-organic-complexes-constructed-from-hydroxyl-and-carboxyl-modified-arenesulfonate-syntheses-structure-evolutions-and-ultraviolet-visible-and-near-infrared-luminescence
#13
Ying-Hui Xiao, Zhao-Peng Deng, Zhi-Biao Zhu, Li-Hua Huo, Shan Gao
The reaction of 2-hydroxyl-4-carboxylbenzenesulfonic acid (H3L) and rare earth (RE) metal nitrates together with two N-heterocyclic ligands gives rise to the formation of 38 complexes, namely, [La(H2L)2(ox)0.5(H2O)4]n·2nH2O (1-La) (ox = oxalate), [RE2(H2L)2 (ox)(H2O)12]·2(H2L)·8H2O (2-RE) (RE = Nd, Sm, Eu, Gd, Tb, Dy), [RE(SO4)(H2O)7]·(H2L)·3H2O (3-RE) (RE = Ho, Er, Tm, Yb, Lu and Y), [RE(L)(H2O)3]n·nH2O (4-RE) (RE = Er, Tm, Yb and Lu), [RE(L)(2,2'-bipy)(H2O)]n (5-RE) (RE = La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho and Y, 2,2'-bipy = 2,2'-bipyridine), [RE(L)(1,10-phen)(H2O)]n (6-RE) (RE = La, Pr, Nd, Sm, Eu, 1,10-phen = 1,10-phenanthroline), and [RE(L')(1,10-phen)2(H2O)]n (7-RE) (RE = Gd, Tb, Ho, Er, Yb and Lu, H3L' = 2-hydroxy-3-nitro-4-carboxybenzenesulfonic acid), which have been characterized by elemental analysis, IR, TG, PL, powder and single-crystal X-ray diffraction...
November 17, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29148366/involvement-of-the-ytfk-gene-from-the-phob-regulon-in-stationary-phase-h2o2-stress-tolerance-in-escherichia-coli
#14
Yumi Iwadate, Jun-Ichi Kato
The Escherichia coli PhoB-PhoR two-component system responds to phosphate starvation and induces the expression of many genes. Previous studies suggested that phosphate starvation induces oxidative stress, but the involvement of the PhoB regulon in oxidative stress tolerance has not been clarified. Here, we showed that ytfK, one of the PhoB regulon genes, is involved in cell tolerance to a redox-cycling drug, menadione, and H2O2 in stationary-phase cells. A ytfK deletion mutant was sensitive to H2O2 when the cells were grown anaerobically or micro-aerobically in the presence of nitrate...
November 17, 2017: Microbiology
https://www.readbyqxmd.com/read/29147480/a-rare-case-of-late-onset-saphenous-vein-graft-spasm
#15
Nirmal Guragai, Upamanyu Rampal, Rahul Vasudev, Hiten Patel, Meherwan B Joshi, Fayez Shamoon
Spasm following coronary artery bypass graft surgery has been well established in arterial grafts, especially in grafts utilizing the internal mammary. Venous graft spasms are uncommon and are only observed in vein grafts during or soon after the coronary artery bypass surgery. It is exceedingly rare to see spasm of venous graft beyond one year of surgery. We report a 72-year-old female who had coronary artery bypass graft three years ago and presented with new onset chest pain for one month. The coronary angiogram revealed severe spasm of the proximal aspect of a patent saphenous venous graft which was relieved by intracoronary nitroglycerine...
2017: Journal of Community Hospital Internal Medicine Perspectives
https://www.readbyqxmd.com/read/29146928/significant-enhanced-uranyl-ions-extraction-efficiency-with-phosphoramidate-functionalized-ionic-liquids-via-synergistic-effect-of-coordination-and-hydrogen-bond
#16
Xiang Xie, Zhen Qin, Yao He, Penghui Xiong, Zeng Huang, Yiwu Mao, Hongyuan Wei, Liangang Zhuo
The influence of the linking group between the phosphoryl and bridging moieties in phosphoryl-containing task-specific ionic liquids (TSILs) on the extraction of uranyl ions was experimentally and theoretically investigated. A novel phosphoramidate-based TSIL with an amine group as the linking moiety resulted in a higher uranyl ion extraction efficiency compared with that of other phosphoryl-based TSILs. A distribution ratio of 4999 ± 51 can be achieved for uranyl ions. The uranyl ions (76.7 ± 1.5%) were stripped from the loaded ionic liquid phase in a single stage using 0...
November 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29146846/high-quality-draft-genome-sequence-of-candidatus-methanoperedens-sp-strain-blz2-a-nitrate-reducing-anaerobic-methane-oxidizing-archaeon-enriched-in-an-anoxic-bioreactor
#17
Stefanie Berger, Jeroen Frank, Paula Dalcin Martins, Mike S M Jetten, Cornelia U Welte
The high-quality draft genome of "Candidatus Methanoperedens sp." strain BLZ2, a nitrate-reducing archaeon anaerobically oxidizing methane, is presented. The genome was obtained from an enrichment culture and measures 3.74 Mb. It harbors two nitrate reductase gene clusters, an ammonium-forming nitrite reductase, and the complete reverse methanogenesis pathway. Methane that escapes to the atmosphere acts as a potent greenhouse gas. Global methane emissions are mitigated by methanotrophs, which oxidize methane to CO2 "Candidatus Methanoperedens spp...
November 16, 2017: Genome Announcements
https://www.readbyqxmd.com/read/29145113/denitrification-behavior-and-microbial-community-spatial-distribution-inside-woodchip-based-solid-phase-denitrification-w-spd-bioreactor-for-nitrate-contaminated-water-treatment
#18
Jiamin Zhao, Chuanping Feng, Shuang Tong, Nan Chen, Shanshan Dong, Tong Peng, Shunlong Jin
The NO3(-) removal pathway and microorganisms change along with the height of an up-flow W-SPD bioreactor was investigated in this study. Modeling and microbial community analysis were used to analyze the denitrification behavior in W-SPD bioreactor. The results showed that NO3(-) removal rate matched for zero-order (R(2) > 0.97) and first-order (R(2) > 0.94) combination Michaelis-Menten kinetics, whereas microbial reaction rate suited for modified logistic model (R(2) > 0.99). The excellent denitrification performance (92...
November 6, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/29143297/impact-of-trimetazidine-treatment-on-5-year-clinical-outcomes-in-patients-with-significant-coronary-artery-spasm-a-propensity-score-matching-study
#19
Yong Hoon Kim, Ae-Young Her, Seung-Woon Rha, Byoung Geol Choi, Se Yeon Choi, Jae Kyeong Byun, Ahmed Mashaly, Yoonjee Park, Won Young Jang, Woohyeun Kim, Jah Yeon Choi, Eun Jin Park, Jin Oh Na, Cheol Ung Choi, Hong Euy Lim, Eung Ju Kim, Chang Gyu Park, Hong Seog Seo, Dong Joo Oh
OBJECTIVE: We aimed to evaluate the additive benefit of trimetazidine with well-known antispasmodic agents such as calcium channel blockers and nitrate in patients with significant coronary artery spasm (CAS) as assessed by acetylcholine provocation test up to 5 years. METHODS: A total 1727 patients with significant CAS were enrolled. They were divided into two groups: a trimetazidine group (trimetazidine, diltiazem, and nitrate, n = 695), and control group (diltiazem and nitrate, n = 473)...
November 15, 2017: American Journal of Cardiovascular Drugs: Drugs, Devices, and Other Interventions
https://www.readbyqxmd.com/read/29143202/tobacco-plants-expressing-the-maize-nitrate-transporter-zmnrt2-1-exhibit-altered-responses-of-growth-and-gene-expression-to-nitrate-and-calcium
#20
Abubakar Ibrahim, Xiao-Lu Jin, Yu-Bin Zhang, Jessica Cruz, Paveena Vichyavichien, Nwadiuto Esiobu, Xing-Hai Zhang
BACKGROUND: Nitrate uptake is a highly regulated process. Understanding the intricate interactions between nitrate availability and genetically-controlled nitrate acquisition and metabolism is essential for improving nitrogen use efficiency and increasing nitrate uptake capacity for plants grown in both nitrate-poor and nitrate-enriched environments. In this report, we introduced into tobacco (Nicotiana tabacum) the constitutively expressed maize high-affinity transporter ZmNrt2.1 gene that would bypass the tight control for the endogenous nitrate-responsive genes...
November 15, 2017: Botanical Studies (Taipei, Taiwan)
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