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https://www.readbyqxmd.com/read/28822952/phosphorus-optimization-for-simultaneous-nitrate-contaminated-groundwater-treatment-and-algae-biomass-production-using-ettlia-sp
#1
Fariba Rezvani, Mohammad-Hossein Sarrafzadeh, Seong-Hyun Seo, Hee-Mock Oh
The effects of phosphorus concentration on the cell growth, nutrient assimilation, photosynthetic parameters, and biomass recovery of Ettlia sp. were evaluated with batch experiments using groundwater, 50mg/L of N-NO3(-), and different concentrations of P-PO4(3-): 0.5, 2.5, 5, and 10mg/L. The maximum biomass productivity and phosphorus removal rate were 0.2g/L/d and 5.95mg/L/d, respectively, with the highest phosphorus concentration of 10mg/L. However, a phosphorus concentration of 5mg/L (N:P=10) was sufficient to ensure an effective nitrogen removal rate of 11mg/L/d, maximum growth rate of 0...
August 12, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28822940/effects-of-airborne-ammonium-and-nitrate-pollution-strongly-differ-in-peat-bogs-but-symbiotic-nitrogen-fixation-remains-unaffected
#2
Eva van den Elzen, Leon J L van den Berg, Bas van der Weijden, Christian Fritz, Lucy J Sheppard, Leon P M Lamers
Pristine bogs, peatlands in which vegetation is exclusively fed by rainwater (ombrotrophic), typically have a low atmospheric deposition of reactive nitrogen (N) (<0.5kgha(-1)y(-1)). An important additional N source is N2 fixation by symbiotic microorganisms (diazotrophs) in peat and mosses. Although the effects of increased total airborne N by anthropogenic emissions on bog vegetation are well documented, the important question remains how different N forms (ammonium, NH4(+), versus nitrate, NO3(-)) affect N cycling, as their relative contribution to the total load strongly varies among regions globally...
August 17, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28822938/do-natural-biofilm-impact-nzvi-mobility-and-interactions-with-porous-media-a-column-study
#3
Marc Crampon, Jennifer Hellal, Christophe Mouvet, Guillaume Wille, Caroline Michel, Anke Wiener, Juergen Braun, Patrick Ollivier
Nanoparticles (NP) used as remediation agents for groundwater treatment may interact with biofilms naturally present, altering NP mobility and/or reactivity and thereby NP effectiveness. The influence of the presence of a multi species biofilm on the mobility of two types of zero-valent iron NP (nZVI; NANOFER 25S and optimized NANOFER STAR, NanoIron s.r.o. (Czech Republic)) was tested in laboratory experiments with columns mimicking aquifer conditions. Biofilms were grown in columns filled with sand in nitrate reducing conditions using groundwater from an industrial site as inoculum...
August 17, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28822815/enrichment-of-highly-settleable-microalgal-consortia-in-mixed-cultures-for-effluent-polishing-and-low-cost-biomass-production
#4
Yuansheng Hu, Xiaodi Hao, Mark van Loosdrecht, Huiqin Chen
Microalgae cultivation is a promising technology for integrated effluent polishing and biofuel production, but poor separability of microalgal cells hinders its industrial application. This study intended to selectively enrich settleable microalgal consortia in mixed culture by applying "wash-out" pressure, which was realized by controlling settling time (ST) and volume exchange ratio (VER) in photo-SBRs. The results demonstrated that highly settleable microalgal consortia (settling efficiency>97%; SVI = 17-50 mL/g) could be enriched from indigenous algal cultures developed in WWTP's effluent...
August 15, 2017: Water Research
https://www.readbyqxmd.com/read/28822504/is-smog-innocuous-air-pollution-and-cardiovascular-disease
#5
EDITORIAL
Sundeep Mishra
Air pollution is a significant environmental and health hazard. Earlier studies had examined the adverse health effects associated with short- and long-term exposure to particulate matter on respiratory disease. However, later studies demonstrated that was actually cardiovascular disease that accounted for majority of mortality. Furthermore, it was not gaseous pollutants like oxides of nitrate, sulfur, carbon mono-oxide or ozone but the particulate matter or PM, of fine or coarse size (PM2.5 and PM10) which was linearly associated with mortality; PM2...
July 2017: Indian Heart Journal
https://www.readbyqxmd.com/read/28822252/removal-of-gadolinium-a-neutron-poison-from-the-moderator-system-of-nuclear-reactors
#6
A L Rufus, Padma S Kumar, K Jeena, S Velmurugan
Gadolinium as gadolinium nitrate is used as neutron poison in the moderator system for regulating and controlling the power generation of Pressurized Heavy Water Reactors (PHWR) and proposed to be used in Advanced Heavy Water Reactors (AHWR) owing to its high neutron absorption cross section. Removal of the added gadolinium nitrate (Gd(3+) and NO3(-)) from the system after its intended use is done using ion exchange resins. In the present investigation, attempts have been made to optimize the ion exchange process for generation of low radioactive waste and maximize utilization of the ion exchange resins by employing different types of resins and different modes of operation...
August 3, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28820992/bioavailability-of-dissolved-organic-nitrogen-don-in-wastewaters-from-animal-feedlots-and-storage-lagoons
#7
Jingyi Sun, Eakalak Khan, Senay Simsek, Jae-Bom Ohm, Halis Simsek
Dissolved organic nitrogen (DON) from animal wastes can contribute to pollution of surface waters. Bioavailable DON (ABDON) is a portion of DON utilized by algae with or without bacteria. This study determined DON and ABDON levels in animal wastewater collected from two different sources: an animal feedlot wastewater storage tank and a sheep wastewater storage lagoon. Inocula for the ABDON bioassays were comprised of individual species and several combinations involving two algae (Chlamydomonas reinhardtii and Chlorella vulgaris) and a mixed liquor suspended solids (MLSS) bacterial culture...
August 1, 2017: Chemosphere
https://www.readbyqxmd.com/read/28820974/a-fast-method-for-the-determination-of-lead-in-honey-samples-using-stabilizer-free-silver-nanoparticles
#8
Dayana Borges Bittar, Tiago Augusto Catelani, Leonardo Pezza, Helena Redigolo Pezza
A sensitive, rapid and robust method based on the use of stabilizer-free silver nanoparticles was developed for lead detection in honey. Silver nanoparticles were synthesized without the presence of any stabilizers using silver nitrate and sodium borohydride as precursors where the latter was applied as reducing agent. The optimization of the experimental variables (AgNO3 and NaBH4) for the formation of the nanoparticles was carried out using varying volumes of these solutions. Spectrophotometric measurements at 393nm showed a linear working range between 0...
August 12, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28820882/correlation-between-mosquito-larval-density-and-their-habitat-physicochemical-characteristics-in-mazandaran-province-northern-iran
#9
Seyed Hassan Nikookar, Mahmoud Fazeli-Dinan, Shahyad Azari-Hamidian, Seyed Nouraddin Mousavinasab, Mohsen Aarabi, Seyyed Payman Ziapour, Yahya Esfandyari, Ahmadali Enayati
Characteristics of mosquito larval habitats are important in determining whether they can survive and successfully complete their developmental stages. Therefore, data on the ecological factors affecting mosquito density and abundance especially the physicochemical properties of water of their breeding sites, can possibly be helpful in implementing larval management programs. Mosquito larvae were collected using a standard 350 ml dipper from fixed habitats including: artificial pool, river edge, creek and etc, in 30 villages of 16 counties from May-December 2014...
August 18, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28820622/latent-growth-curve-modeling-of-non-injection-drug-use-and-condomless-sexual-behavior-from-ages-18-to-21-in-gay-bisexual-and-other-ymsm-the-p18-cohort-study
#10
Perry N Halkitis, Kristen Bub, Christopher B Stults, Francesca C Bates, Farzana Kapadia
BACKGROUND: HIV/AIDS continues to be a health disparity faced by sexual minority men, and is exacerbated by non-injection drug use. OBJECTIVES: We sought to delineate growth in non-injection drug use and condomless sex in a sample of racially and economically diverse of gay, bisexual, and other young men who have sex with men (YMSM) as they emerged into adulthood between the ages of 18 and 21 and who came of age in the post-HAART era. METHODS: Behavioral data on drug use and condomless sex, collected via a calendar based technique over 7 waves of a cohort study of 600 YMSM, were analyzed using latent growth curve modeling to document patterns of growth in these behaviors, their associations, and the extent to which patterns and associations are moderated by race/ethnicity and socioeconomic status...
August 18, 2017: Substance Use & Misuse
https://www.readbyqxmd.com/read/28820490/the-potentiodynamic-bottom-up-growth-of-the-tin-oxide-nanostructured-layer-for-gas-analytical-multisensor-array-chips
#11
Fedor S Fedorov, Dmitry Podgainov, Alexey Varezhnikov, Andrey Lashkov, Michail Gorshenkov, Igor Burmistrov, Martin Sommer, Victor Sysoev
We report a deposition of the tin oxide/hydroxide nanostructured layer by the potentiodynamic method from acidic nitrate solutions directly over the substrate, equipped with multiple strip electrodes which is employed as a gas-analytical multisensor array chip. The electrochemical synthesis is set to favor the growth of the tin oxide/hydroxide phase, while the appearance of metallic Sn is suppressed by cycling. The as-synthesized tin oxide/hydroxide layer is characterized by mesoporous morphology with grains, 250-300 nm diameter, which are further crystallized into fine SnO₂ poly-nanocrystals following heating to 300 °C for 24 h just on the chip...
August 18, 2017: Sensors
https://www.readbyqxmd.com/read/28819258/groundwater-nitrate-response-to-sustainable-nitrogen-management
#12
Birgitte Hansen, Lærke Thorling, Jörg Schullehner, Mette Termansen, Tommy Dalgaard
Throughout the world, nitrogen (N) losses from intensive agricultural production may end up as undesirably high concentrations of nitrate in groundwater with a long-term impact on groundwater quality. This has human and environmental health consequences, due to the use of groundwater as a drinking water resource, and causes eutrophication of groundwater-dependent ecosystems such as wetlands, rivers and near-coastal areas. At national scale, the measured nitrate concentrations and trends in Danish oxic groundwater in the last 70 years correlate well with the annual agricultural N surpluses...
August 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28819112/tracing-nitrate-sources-with-dual-isotopes-and-long-term-monitoring-of-nitrogen-species-in-the-yellow-river-china
#13
Fu-Jun Yue, Si-Liang Li, Cong-Qiang Liu, Zhi-Qi Zhao, Hu Ding
A heavy load of nitrogenous compounds reflects nutrient loss and influences water quality in large rivers. Nitrogenous concentrations and dual isotopes of nitrate were measured to ascertain the spatial and temporal distributions of nitrate transformation in the Yellow River, the second-longest river in China. Assessment of the long-term record indicates that [NO3(-)-N] has increased by two-fold over the past three decades. Weekly observation of ammonium over a twelve-year period revealed high concentrations and suggests impairment of water quality, particularly since 2011...
August 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28818795/mitigating-inhibition-of-undissociated-volatile-fatty-acids-vfas-for-enhanced-sludge-rice-bran-composting-with-ferric-nitrate-amendment
#14
Zongqi Shou, Haiping Yuan, Yanwen Shen, Jiayun Liang, Nanwen Zhu, Lin Gu
This study investigated the effect of ferric nitrate on mitigating the inhibition of volatile fatty acids (VFAs) during the initial phase of sewage sludge composting amended with rice bran. During the 34-day lab-scale composting, the supplementation of ferric nitrate enhanced the degradation of VFAs by up to 3 times as compared to the control. The organic matters loss (OML) rate in the treatment reactor was almost doubled with supplementation of ferric nitrate as compared to the control reactor during the initial phase...
August 5, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28818578/can-exercise-training-counteract-doxorubicin-induced-oxidative-damage-of-testis-proteome
#15
José Magalhães, António Ascensão, Ana I Padrão, Inês M Aleixo, Estela Santos-Alves, Sílvia Rocha-Rodrigues, André Ferreira, Luis Korrodi-Gregório, Rui Vitorino, Rita Ferreira, Margarida Fardilha
The use of the chemotherapeutic drug doxorubicin (DOX) is limited by its toxicity in several organs such as testes. So, we analyzed the effect of endurance treadmill exercise training (EX) performed before sub-chronic DOX treatment on sperm count and motility, testes markers of oxidative damage and apoptosis. Tissue profiling of proteins more susceptible to oxidation was made to identify the molecular pathways regulated by oxidative modifications, as nitration and carbonylation. Twenty-four adult male rats were divided into four groups (n=6/group): sedentary saline (SED+SAL), sedentary sub-chronically injected with DOX (2mg-kg-1 per week, during 7 weeks; SED+DOX), 12 weeks trained saline (EX+SAL) and trained treated with DOX (EX+DOX)...
August 14, 2017: Toxicology Letters
https://www.readbyqxmd.com/read/28818388/genetic-analysis-of-rootstock-mediated-nitrogen-n-uptake-and-root-to-shoot-signalling-at-contrasting-n-availabilities-in-tomato
#16
M J Asins, A Albacete, C Martinez-Andujar, F Pérez-Alfocea, I C Dodd, E A Carbonell, J A Dieleman
Selecting rootstocks for high nitrogen acquisition ability may allow decreased N fertilizer application without reducing tomato yields, minimizing environmental nitrate pollution. A commercial hybrid tomato variety was grafted on a genotyped population of 130 recombinant inbred lines (RILs) derived from Solanum pimpinellifolium, and compared with self- and non-grafted controls under contrasting nitrate availabilities (13.8 vs 1.0mM) in the nutrient solution. Grafting itself altered xylem sap composition under N-sufficient conditions, particularly Na(+) (8...
October 2017: Plant Science: An International Journal of Experimental Plant Biology
https://www.readbyqxmd.com/read/28818078/development-of-a-silicon-limitation-inducible-expression-system-for-recombinant-protein-production-in-the-centric-diatoms-thalassiosira-pseudonana-and-cyclotella-cryptica
#17
Roshan P Shrestha, Mark Hildebrand
BACKGROUND: An inducible promoter for recombinant protein expression provides substantial benefits because under induction conditions cellular energy and metabolic capability can be directed into protein synthesis. The most widely used inducible promoter for diatoms is for nitrate reductase, however, nitrogen metabolism is tied into diverse aspects of cellular function, and the induction response is not necessarily robust. Silicon limitation offers a means to eliminate energy and metabolic flux into cell division processes, with little other detrimental effect on cellular function, and a protein expression system that works under those conditions could be advantageous...
August 17, 2017: Microbial Cell Factories
https://www.readbyqxmd.com/read/28818018/effect-of-operational-parameters-and-pd-in-catalyst-in-the-reduction-of-nitrate-using-copper-electrode
#18
Thiago Favarini Beltrame, Vanessa Coelho, Luciano Marder, Jane Zoppas Ferreira, Fernanda Albana Marchesini, Andrea Moura Bernardes
Water with high concentration of nitrate may cause damage to health and to the environment. This study investigated how concentration, current density, flow, pH, the use of Pd/In catalyst and operating mode (constant current density and constant cell potential) have an influence in the electrochemical reduction of nitrate and in the formation of gaseous compounds using copper electrode. Experiments were performed in two-compartment electrolytic cells separated by a cationic membrane with nitrate model solutions prepared as a surrogate of concentrated brines from membrane desalination plants...
August 18, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28817281/linking-solution-structures-and-energetics-thorium-nitrate-complexes
#19
Suntharalingam Skanthakumar, Geng Bang Jin, Jian Lin, Valérie Vallet, Lynda Soderholm
Seeking predictive insights into how metal-ion speciation impacts solution chemistry as well as the composition and structure of solid-precipitates, thorium correlations, with both solvent and other solute ions, were quantitatively probed in a series of acidic, nitrate/perchlorate solutions held at constant ionic strength. Difference pair-distribution functions (dPDF), obtained from high-energy x-ray scattering (HEXS) data, provide unprecedented structural information on the number of Th ligating ions in solution and how they change with increasing nitrate concentration...
August 17, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28816308/ln-iii-complexes-ln-eu-gd-tb-dy-with-a-chiral-ligand-containing-1-10-phenanthroline-and-menthol-fragments-synthesis-structure-magnetic-properties-and-photoluminescence
#20
Stanislav V Larionov, Yuliya A Bryleva, Ludmila A Glinskaya, Victor F Plyusnin, Arkady S Kupryakov, Alexander M Agafontsev, Alexey V Tkachev, Artem S Bogomyakov, Dmitry A Piryazev, Ilya V Korolkov
A series of lanthanide(iii) complexes based on the new chiral ligand L, which contains 1,10-phenanthroline and (-)-menthol fragments, namely [LnL2(NO3)3] (Ln = Eu (1), Gd (2), Tb (3), Dy (4)), have been synthesized and structurally characterized. Complexes 1-4 are isostructural and crystallize in the non-centrosymmetric space group P41212. The mononuclear complexes comprise a 10-coordinate Ln(3+) ion with two bidentate N,N-donor ligands (L) and three bidentate chelating nitrate groups. The magnetic properties of complexes 1-4 are determined mainly by the Ln(3+) ions...
August 17, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
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