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https://www.readbyqxmd.com/read/28324851/assessing-the-impacts-of-best-management-practices-on-nitrate-pollution-in-an-agricultural-dominated-lowland-catchment-considering-environmental-protection-versus-economic-development
#1
Marcelo B Haas, Björn Guse, Nicola Fohrer
Water quality is strongly affected by nitrate inputs in agricultural catchments. Best Management Practices (BMPs) are alternative practices aiming to mitigate the impacts derived from agricultural activities and to improve water quality. Management activities are influenced by different governmental policies like the Water Framework Directive (WFD) and the Renewable Energy Sources Act (EEG). Their distinct goals can be contrasting and hamper an integrated sustainable development. Both need to be addressed in the actual conjuncture in rural areas...
March 15, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28324835/flexible-biological-arsenite-oxidation-utilizing-nox-and-o2-as-alternative-electron-acceptors
#2
Jie Wang, Junfeng Wan, Zihao Wu, Hongli Li, Haisong Li, Christophe Dagot, Yan Wang
The feasibility of flexible microbial arsenite (As(III)) oxidation coupled with the reduction of different electron acceptors was investigated. The results indicated the acclimated microorganisms could oxidize As(III) with oxygen, nitrate and nitrite as the alternative electron acceptors. A series of batch tests were conducted to measure the kinetic parameters of As(III) oxidation and to evaluate the effects of environmental conditions including pH and temperature on the activity of biological As(III) oxidation dependent on different electron acceptors...
March 18, 2017: Chemosphere
https://www.readbyqxmd.com/read/28324768/analysis-of-different-materials-subjected-to-open-air-explosions-in-search-of-explosive-traces-by-raman-microscopy
#3
Félix Zapata, Carmen García-Ruiz
Post-explosion scenes offer such chaos and destruction that evidence recovery and detection of post-blast residues from the explosive in the surrounding materials is highly challenging and difficult. The suitability of materials to retain explosives residues and their subsequent analysis has been scarcely investigated. Particularly, the use of explosive mixtures containing inorganic oxidizing salts to make improvised explosive devices (IEDs) is a current security concern due to their wide availability and lax control...
March 16, 2017: Forensic Science International
https://www.readbyqxmd.com/read/28324689/calcium-phosphate-quercetin-nanocomposite-cpqn-a-multi-functional-nanoparticle-having-ph-indicating-highly-fluorescent-and-anti-oxidant-properties
#4
Mousumi Patra, Riya Mukherjee, Milon Banik, Debanjan Dutta, Naznin Ara Begum, Tarakdas Basu
Calcium phosphate quercetin nanocomposite (CPQN) i.e., quercetin entrapped in calcium phosphate nanoparticle was synthesized by a precipitation method at 80°C, taking ammonium hydrogen phosphate, calcium nitrate and quercetin as precursors and sodium citrate as stabilizer. The nanocomposite suspension had different color at different pH values, a property that could render the nanoparticle a pH indicator. Besides color, the particles also had different size, shape, stability and quercetin content with change of pH...
March 14, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28323554/selective-nitration-of-psbo1-inhibits-oxygen-evolution-from-isolated-arabidopsis-thylakoid-membranes
#5
Misa Takahashi, Jun Shigeto, Atsushi Sakamoto, Hiromichi Morikawa
Treatment of isolated Arabidopsis thaliana thylakoid membranes with nitrogen dioxide (NO2) induces selective nitration of the tyrosine residue at the ninth amino acid ((9)Tyr) of PsbO1. This selective nitration is triggered by light and is inhibited by photosynthetic electron transport inhibitors. Therefore, we postulated that, similar to (161)Tyr of D1 (Yz), (9)Tyr of PsbO1 is redox active and is selectively oxidized by photosynthetic electron transport in response to illumination to a tyrosyl radical that is highly susceptible to nitration...
March 21, 2017: Plant Signaling & Behavior
https://www.readbyqxmd.com/read/28320043/effects-of-ranolazine-in-a-model-of-doxorubicin-induced-left-ventricle-diastolic-dysfunction
#6
Donato Cappetta, Grazia Esposito, Raffaele Coppini, Elena Piegari, Rosa Russo, Loreta Pia Ciuffreda, Alessia Rivellino, Lorenzo Santini, Concetta Rafaniello, Cristina Scavone, Francesco Rossi, Liberato Berrino, Konrad Urbanek, Antonella De Angelis
BACKGROUND AND PURPOSE: Doxorubicin (DOXO) is a highly effective anticancer drug but its clinical application is impeded by cardiotoxicity. Asymptomatic diastolic dysfunction can be the earliest manifestation of DOXO cardiotoxicity. Therefore, a search for therapeutic intervention that can interfere with early manifestations and possibly prevent late cardiotoxicity is warranted. Increased DOXO-dependent reactive oxygen species may explain, in part, Ca(2+) and Na(+) overload that contributes to diastolic dysfunction and development of heart failure...
March 20, 2017: British Journal of Pharmacology
https://www.readbyqxmd.com/read/28319888/heterogeneous-reaction-of-peroxyacetyl-nitrate-pan-on-soot
#7
Ximeng Zhao, Tianyu Gao, Jianbo Zhang
The interaction between photochemical oxidants and aerosol particles has been examined in previous atmospheric pollution studies. The heterogeneous reaction can affect the concentration of gases and free radicals, as well as the morphology and properties of particles. In this report, the interaction between the photochemical oxidant peroxyacetyl nitrate (PAN) and soot particles was investigated using a flow tube system. We used real-time online monitoring equipment to track changes in PAN concentrations. Substances on the soot surface were detected using ion chromatography (IC), x-ray photoelectron spectroscopy (XPS), and other surface analysis methods...
March 6, 2017: Chemosphere
https://www.readbyqxmd.com/read/28319719/year-round-phytofiltration-lagoon-assessment-using-pistia-stratiotes-within-a-pilot-plant-scale-biorefinery
#8
Eugenia J Olguín, Daniel A García-López, Ricardo E González-Portela, Gloria Sánchez-Galván
Phytofiltration lagoons are phytoremediation technologies suitable for tropical and sub-tropical regions requiring cost-effective and echo-friendly technologies. A biorefinery of fourth generation has been implemented at pilot plant level in Xalapa, Mexico, and the phytofiltration lagoon, being the first module for provision of treated water and plant biomass for biofuel production plays a key role. The aim of this work was to evaluate the performance of such phytofiltration lagoon with a working volume of 13,000 L for the removal of nutrients from an urban river polluted with domestic wastewater and the biomass productivity of the macrophyte Pistia stratiotes, during five different experimental periods, comprising 42 days each one...
March 16, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28319703/impacts-of-human-activities-on-nutrient-transport-in-the-yellow-river-the-role-of-the-water-sediment-regulation-scheme
#9
Xinyu Li, Hontao Chen, Xueyan Jiang, Zhigang Yu, Qingzhen Yao
Anthropogenic activities alter the natural states of large rivers and their surrounding environment. The Yellow River is a well-studied case of a large river with heavy human control. An artificial managed water and sediment release system, known as the Water-Sediment Regulation Scheme (WSRS), has been carried out annually in the Yellow River since 2002. Nutrient concentrations and composition display significant time and space variations during the WSRS period. To figure out the anthropogenic impact of nutrient changes and transport in the Yellow River, biogeochemical observations were carried out in both middle reaches and lower reaches of the Yellow River during 2014 WSRS period...
March 15, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28319596/medium-term-effects-of-dietary-nitrate-supplementation-on-systolic-and-diastolic-blood-pressure-in-adults-a-systematic-review-and-meta-analysis
#10
Ammar W Ashor, Jose Lara, Mario Siervo
OBJECTIVES: Dietary nitrate supplementation has been shown to lower blood pressure (BP) particularly in short-term clinical trials. Whether these effects are sustained in the long-term remains to be established. The objective was to conduct a meta-analysis of randomized controlled trials that examined whether dietary nitrate supplementation for more than 1 week has beneficial effects on SBP and DBP. METHODS: Electronic databases were searched from inception until May 2016...
March 17, 2017: Journal of Hypertension
https://www.readbyqxmd.com/read/28319278/how-does-ceiii-nitrate-dissolve-in-a-protic-ionic-liquid-a-combined-molecular-dynamics-and-exafs-study
#11
Paola D'Angelo, Valentina Migliorati, Alessandra Serva, Riccardo Spezia
A diluted solution of Ce(NO₃)₃ in the protic ionic liquid (IL) ethylammonium nitrate (EAN) is investigated using molecular dynamics (MD) simulations and extended X-ray absorption fine structure (EXAFS) spectroscopy. For the first time polarizable effects are included in the MD force field to describe a heavy metal ion in a protic IL, but, unlike water, they are found to be unessential. The CeIII ion first solvation shell is formed by nitrate ions arranged in an icosahedral structure, and an equilibrium between monodentate and bidentate ligands is present in the solution...
March 20, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28319269/withdrawn-trimetazidine-for-stable-angina
#12
REVIEW
Agustín Ciapponi, Rudolf Pizarro, Jeff Harrison
BACKGROUND: Patients with stable angina not controlled by monotherapy with nitrates, beta blockers, or calcium channel blockers are often treated with combinations of these drugs. There may be adverse effects from, or contraindications to, the use of combinations. In low risk groups, medical treatment appears to be as good an option as percutaneous transluminal coronary angioplasty in terms of averting myocardial infarction, death, or subsequent revascularization. Revascularization procedures are too costly or inaccessible for many patients in developing countries therefore effective and safe medical treatment is needed...
March 20, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/28319110/systemic-nutrient-signalling-on-the-road-for-nitrate
#13
Sandrine Ruffel, Alain Gojon
No abstract text is available yet for this article.
March 20, 2017: Nature Plants
https://www.readbyqxmd.com/read/28319056/shoot-to-root-mobile-polypeptides-involved-in-systemic-regulation-of-nitrogen-acquisition
#14
Yuri Ohkubo, Mina Tanaka, Ryo Tabata, Mari Ogawa-Ohnishi, Yoshikatsu Matsubayashi
Plants uptake nitrogen (N) from the soil mainly in the form of nitrate. However, nitrate is often distributed heterogeneously in natural soil. Plants, therefore, have a systemic long-distance signalling mechanism by which N starvation on one side of the root leads to a compensatory N uptake on the other N-rich side(1,2). This systemic N acquisition response is triggered by a root-to-shoot mobile peptide hormone, C-TERMINALLY ENCODED PEPTIDE (CEP), originating from the N-starved roots(3,4), but the molecular nature of the descending shoot-to-root signal remains elusive...
March 20, 2017: Nature Plants
https://www.readbyqxmd.com/read/28318790/wood-burning-pollution-in-southern-chile-pm2-5-source-apportionment-using-cmb-and-molecular-markers
#15
Ana M Villalobos, Francisco Barraza, Héctor Jorquera, James J Schauer
Temuco is a mid-size city representative of severe wood smoke pollution in southern Chile; i.e., ambient 24-h PM2.5 concentrations have exceeded 150 μg/m(3) in the winter season and the top concentration reached 372 μg/m(3) in 2010. Annual mean concentrations have decreased but are still above 30 μg/m(3). For the very first time, a molecular marker source apportionment of ambient organic carbon (OC) and PM2.5 was conducted in Temuco. Primary resolved sources for PM2.5 were wood smoke (37.5%), coal combustion (4...
March 16, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28318786/modulation-of-the-stress-response-in-wild-fish-is-associated-with-variation-in-dissolved-nitrate-and-nitrite
#16
Tom G Pottinger
Disruption of non-reproductive endocrine systems in wildlife by chemicals has received little attention but represents a potentially significant problem. Nitrate is a major anthropogenic contaminant in the freshwater aquatic environment and has been identified as a potential disrupter of endocrine function in aquatic animals. This study was conducted to investigate the relationship between the function of the neuroendocrine stress axis in fish and inorganic N loading along reaches of rivers receiving cumulative point source and diffuse chemical inputs...
March 15, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28318700/effects-of-warming-and-nitrogen-deposition-on-ch4-co2-and-n2o-emissions-in-alpine-grassland-ecosystems-of-the-qinghai-tibetan-plateau
#17
Zhenzhen Zhao, Shikui Dong, Xiaoman Jiang, Shiliang Liu, Hanzhong Ji, Yu Li, Yuhui Han, Wei Sha
Increases in nitrogen (N) deposition along with climate warming can change the dynamics of carbon and nitrogen in the soil, and alter greenhouse gases (GHGs) fluxes. To examine how N deposition and warming affect GHGs (CH4, CO2 and N2O) fluxes in alpine grasslands, we conducted experiments in an alpine meadow (AM), alpine-steppe (AS), and alpine cultivated grassland (CG) on the Qinghai-Tibetan Plateau (QTP). We simulated N deposition by treating soil with ammonium nitrate (NH4NO3) (8kgNha(-1)year(-1)), a warming treatment using an open top chamber (OTC) was carried out, and a combined treatment of warming and N deposition (8kgNha(-1)year(-1)) was conducted...
March 16, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28318695/monitoring-water-quality-in-toronto-s-urban-stormwater-ponds-assessing-participation-rates-and-data-quality-of-water-sampling-by-citizen-scientists-in-the-freshwater-watch
#18
Andrew B Scott, Paul C Frost
From 2013 to 2015, citizen scientist volunteers in Toronto, Canada were trained to collect and analyze water quality in urban stormwater ponds. This volunteer sampling was part of the research program, FreshWater Watch (FWW), which aimed to standardize urban water sampling efforts from around the globe. We held training sessions for new volunteers twice yearly and trained a total of 111 volunteers. Over the course of project, ~30% of volunteers participated by collecting water quality data after the training session with 124 individual sampling events at 29 unique locations in Toronto, Canada...
March 16, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28318694/facile-synthesis-of-cu-ii-impregnated-biochar-with-enhanced-adsorption-activity-for-the-removal-of-doxycycline-hydrochloride-from-water
#19
Su Liu, Wei-Hua Xu, Yun-Guo Liu, Xiao-Fei Tan, Guang-Ming Zeng, Xin Li, Jie Liang, Zan Zhou, Zhi-Li Yan, Xiao-Xi Cai
In this study, the effect factors and mechanisms of doxycycline hydrochloride (DOX) adsorption on copper nitrate modified biochar (Cu-BC) was investigated. Cu-BC absorbent was synthesized through calcination of peanut shells biomass at 450°C and then impregnation with copper nitrate. The Cu-BC has exhibited excellent sorption efficiency about 93.22% of doxycycline hydrochloride from aqueous solution, which was double higher than that of the unmodified biochar. The experimental results suggest that the adsorption efficiency of DOX on the Cu-BC is dominated by the strong complexation, electrostatic interactions between DOX molecules and the Cu-BC samples...
March 16, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28318693/the-influence-of-dual-substrate-layer-extensive-green-roofs-on-rainwater-runoff-quantity-and-quality
#20
Xiaoou Wang, Yimei Tian, Xinhua Zhao
This study investigates the ability of dual-substrate-layer extensive green roofs to retain rainwater and reduce pollutant leaching. The substrates in dual-substrate-layer green roofs consist of an upper organic nutrition layer for plant growth and a lower inorganic adsorption layer for water retention and pollutant reduction. One traditional single-substrate-layer extensive green roof was built for comparison with dual-substrate-layer green roofs. During the experimental period, dual-substrate-layer green roofs supported better natural vegetation growth, with coverage exceeding 90%, while the coverage in single-substrate-layer green roof was over 80%...
March 16, 2017: Science of the Total Environment
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