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https://www.readbyqxmd.com/read/28545211/nano-enabling-of-strong-base-ion-exchange-media-via-a-room-temperature-aluminum-hydr-oxide-synthesis-method-to-simultaneously-remove-nitrate-and-fluoride
#1
Jasmina Markovski, Jose Garcia, Kiril D Hristovski, Paul Westerhoff
This study demonstrated a new room-temperature method for synthesizing aluminum (hydr)oxide material inside the pores of strong-base ion-exchange resin to fabricate a novel class of hybrid media capable of simultaneously removing nitrate and fluoride as model groundwater contaminants. The aluminum (hydr)oxide hybrid media was fabricated by reducing aluminum ion precursors with borohydride within ion-exchange resin at room temperature, followed by exposure to environmental oxygen. The hybrid media was characterized, and its performance to simultaneously remove nitrate and fluoride was determined in simple and complex water matrices using short-bed column tests operated under conditions realistic for point-of-use systems...
May 20, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28544987/a-high-efficiency-denitrification-bioreactor-for-the-treatment-of-acrylonitrile-wastewater-using-waterborne-polyurethane-immobilized-activated-sludge
#2
Honghong Dong, Wei Wang, Zhaozheng Song, Hao Dong, Jianfeng Wang, Shanshan Sun, Zhongzhi Zhang, Ming Ke, Zhenjia Zhang, Wei-Min Wu, Guangqing Zhang, Jie Ma
The performance of a laboratory-scale, high-efficiency denitrification bioreactor (15L) using activated sludge immobilized by waterborne polyurethane in treating acrylonitrile wastewater with high concentration of nitrate nitrogen (249mg/L) was investigated. The bioreactor was operated at 30°C for 220days. Batch denitrification experiments showed that the optimal operation parameters were C/NO3(-)-N molar ratio of 2.0 using sodium acetate as electron donor and carrier filling rate of 20% (V/V) in the bioreactor...
May 5, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28544928/achieving-advanced-nitrogen-removal-for-small-flow-wastewater-using-a-baffled-bioreactor-bbr-with-intermittent-aeration
#3
Guoqiang Liu, Jianmin Wang
Nitrogen discharge from decentralized and onsite wastewater treatment systems, such as recirculating sand filters, stabilization ponds, and septic tanks, is an important source of groundwater and surface water contamination. This study demonstrated a simple baffled bioreactor (BBR) technology, operated with an intermittent aeration mode, that effectively removed nearly all nitrogen for small flow wastewater treatment. The BBR is characterized by an aeration zone, followed by an integrated internal settler, which automatically retains a high biomass concentration of approximately 6 g/L without using a separate sludge return device...
May 22, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28544522/metagenomic-potential-for-and-diversity-of-n-cycle-driving-microorganisms-in-the-bothnian-sea-sediment
#4
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/28544414/effective-low-cost-recovery-of-toxic-arsenate-anions-from-water-using-hollow-sphere-trapper-geodes
#5
Sherif A El-Safty, Mohamed A Shenashen, Naeem Akhtar, Mahmoud M Selim, Wafaa M Morsy, Hitoshi Yamaguchi, Satoshi Kawada, Abdulaziz A Alhamid, Naoki Ohashi, Izumi Ichinose, Ahmed Alamoudi
Because of the devastating impacts of arsenic to terrestrial and aquatic organisms, recovery, removal, disposal and management of arsenic-contaminated water has a considerable challenge and become an urgent necessity in the field of water treatment. This study reports control fabrication of low-cost adsorbents based on microscopic NiO hollow sphere geode-shelled a 100 nm of poly-CN nano-sphere particles-like nodules of poly-carbon nitride that intrinsically stacked and wrapped around the hollow nest spheres to form 500-700 nm shell...
May 22, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28544392/growth-process-and-anti-cancer-properties-of-gold-nanorods
#6
Junyan Zhang, Mian Wang, Thomas J Webster
Gold nanoparticles have been of great interest due to their unique optical properties, facile synthesis and conjugation. Among various shapes of gold nanoparticles, gold nanorods have been widely studied. They can be conjugated with different molecules for biomedical applications, such as tumor imaging and therapy. However, few researchers have studied the anti-tumor properties of bare gold nanorods. In this study, unfunctionalized gold nanorods were synthesized and tested on breast tumor cells. Results showed that the aspect ratio of gold nanorods could be easily influenced by both reaction time and the amount of silver nitrate in the growth solution...
May 24, 2017: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/28544043/identification-of-v-type-nerve-agents-in-vapor-samples-using-a-field-portable-capillary-gas-chromatography-membrane-interfaced-electron-ionization-quadrupole-mass-spectrometry-instrument-with-tri-bed-concentrator-and-fluoridating-conversion-tube
#7
Yasuhiko Ohrui, Tomoki Nagoya, Naoko Kurimata, Manabu Sodeyama, Yasuo Seto
A field-portable gas chromatography-mass spectrometry (GC-MS) system (Hapsite ER) was evaluated for the detection of nonvolatile V-type nerve agents (VX and Russian VX (RVX)) in the vapor phase. The Hapsite ER system consists of a Tri-Bed concentrator gas sampler, a nonpolar low thermal-mass capillary gas chromatography column and a hydrophobic membrane-interfaced electron ionization quadrupole mass spectrometer evacuated by a non-evaporative getter pump. The GC-MS system was attached to a VX-G fluoridating conversion tube containing silver nitrate and potassium fluoride...
May 25, 2017: Journal of Mass Spectrometry: JMS
https://www.readbyqxmd.com/read/28543305/effects-of-nitrogenous-wastes-on-survival-of-the-barton-springs-salamander-eurycea-sosorum
#8
Justin C Crow, Kenneth G Ostrand, Michael R J Forstner, Matthew Catalano, Joseph R Tomasso
The objective of our study was to determine the acute toxicity of 3 common aquatic nitrogenous toxicants to the federally endangered Barton Springs salamander (Eurycea sosorum). Based on our findings, the 96-hour median-lethal concentration (96-h LC50) for un-ionized ammonia-N, nitrite-N, and nitrate-N to E. sosorum are 2.0 ± 0.32 mg/L, 31.7 ± 4.02 mg/L, and 968.5 ± 150.6 mg/L, respectively. These results establish a benchmark for the tolerance of plethodontid salamanders to these toxicants and indicate that current water quality criteria are adequate for their protection...
May 23, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28540729/dye-bio-mof-1-composite-as-a-dual-emitting-platform-for-enhanced-detection-of-a-wide-range-of-explosive-molecules
#9
Chen Wang, Li Tian, Wei Zhu, Shiqiang Wang, Peng Wang, Yun Liang, Wanlin Zhang, Hongwei Zhao, Guangtao Li
By incorporating a cationic dye within metal-organic framework (MOF) through ion-exchange process, a responsive dye@bio-MOF-1 composite has been synthesized, serving as a dual-emitting platform for enhanced detection of different kinds of nitro-explosives, especially the nitroalkanes, nitramines and nitrate esters. The dye@bio-MOF-1 composite was constructed with free amines on their well-defined cavities, which is essential for the capture of explosives into their confined nanospace. It was observed that the encapsulation of explosives into the constructed dye@bio-MOF-1 composite could dramatically alter the luminescent properties of the dyes as well as the MOF skeletons owing to the size exclusivity and confinement-induced effect...
May 25, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28539265/removal-of-toxic-heavy-metal-lead-ii-using-chitosan-oligosaccharide-graft-maleic-anhydride-polyvinyl-alcohol-silk-fibroin-composite
#10
Ajitha P, Vijayalakshmi K, Saranya M, Gomathi T, Rani K, Sudha P N, Anil Sukumaran
The present work was aimed to investigate the efficiency of novel chitosan oligosaccharide-graft-maleic anhydride(COS-g-MAH)/Polyvinyl alcohol (PVA)/silk fibroin (SF) composite for removing the toxic heavy metal lead (II) ion from aqueous solution by batch adsorption studies. Initially the chitosan oligosaccharide-graft-maleic anhydride copolymer has been prepared by utilizing ceric ammonium nitrate as an initiator and the optimised graft copolymer was then used for synthesizing COS-g-MAH/PVA/SF composite. The prepared samples were analyzed through FTIR and XRD studies...
May 21, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28539105/removal-of-sulfamethoxazole-and-diclofenac-from-water-strategies-involving-o3-and-h2o2
#11
Daniela S Gomes, Licínio M Gando-Ferreira, Rosa M Quinta-Ferreira, Rui C Martins
Diclofenac (DCF) and Sulfamethoxazole (SMX) are two of the most frequently detected pharmaceutical compounds in water and are hardly removed by biological treatment systems. The presence of H2O2 was investigated in the ozonation of these two compounds. Experiments were carried out with both using distillated water and secondary effluent from a municipal wastewater treatment plant (WWTP) spiked with pharmaceuticals. Chemical oxygen demand (COD) abatement rate improved when H2O2 was added at the beginning of the ozonation process and when the ozone inlet concentration increased, attaining a maximum value of 91% and simultaneously a lower ozone waste for a H2O2 initial concentration of 5 mM and an ozone inlet concentration of 20 g Nm(-3)...
May 25, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28539047/identifying-the-protein-interactions-of-the-cytosolic-iron-sulfur-cluster-targeting-complex-essential-for-its-assembly-and-recognition-of-apo-targets
#12
Amanda Thuy Van Vo, Nicholas M Fleischman, Mary J Froehlich, Claudia Y Lee, Jessica A Cosman, Calina A Glynn, Zanub O Hassan, Deborah L Perlstein
The cytosolic iron sulfur cluster assembly (CIA) system assembles iron sulfur (FeS) cluster cofactors and inserts them into >20 apo-protein targets residing in the cytosol and nucleus. Three CIA proteins, called Cia1, Cia2, and Met18 in yeast, form the targeting complex responsible for apo-target recognition. There is little information about the structure of this complex or its mechanism of CIA substrate recognition. Herein, we exploit affinity co-purification and size exclusion chromatography to determine the subunit connectivity and stoichiometry of the CIA targeting complex...
May 25, 2017: Biochemistry
https://www.readbyqxmd.com/read/28538760/a-multivariate-model-for-prediction-of-obstructive-coronary-disease-in-patients-with-acute-chest-pain-development-and-validation
#13
Luis Cláudio Lemos Correia, Maurício Cerqueira, Manuela Carvalhal, Felipe Ferreira, Guilherme Garcia, André Barcelos da Silva, Nicole de Sá, Fernanda Lopes, Ana Clara Barcelos, Márcia Noya-Rabelo
Background: Currently, there is no validated multivariate model to predict probability of obstructive coronary disease in patients with acute chest pain. Objective: To develop and validate a multivariate model to predict coronary artery disease (CAD) based on variables assessed at admission to the coronary care unit (CCU) due to acute chest pain. Methods: A total of 470 patients were studied, 370 utilized as the derivation sample and the subsequent 100 patients as the validation sample...
April 2017: Arquivos Brasileiros de Cardiologia
https://www.readbyqxmd.com/read/28537420/nitration-and-glycation-turn-mature-ngf-into-a-toxic-factor-for-motor-neurons-a-role-for-p75-sup-ntr-sup-and-rage-signaling-in-als
#14
Mi Jin Kim, Marcelo R Vargas, Benjamin A Harlan, Kelby M Killoy, Lauren Ball, Susana Comte-Walters, Monika Gooz, Yasuhiko Yamamoto, Joseph S Beckman, Luis Barbeito, Mariana Pehar
Glycating stress can occur together with oxidative stress during neurodegeneration and contribute to the pathogenic mechanism. Nerve growth factor (NGF) accumulates in several neurodegenerative diseases. Besides promoting survival, NGF can paradoxically induce cell death by signaling through the p75 neurotrophin receptor (p75<sup>NTR</sup>). The ability of NGF to induce cell death is increased by nitration of its tyrosine residues under conditions associated with increased peroxynitrite formation...
May 24, 2017: Antioxidants & Redox Signaling
https://www.readbyqxmd.com/read/28537018/syntrophic-association-and-performance-of-clostridium-desulfovibrio-aeromonas-and-tetrathiobacter-as-anodic-biocatalysts-for-bioelectricity-generation-in-dual-chamber-microbial-fuel-cell
#15
Smita S Kumar, Sandeep K Malyan, Suddhasatwa Basu, Narsi R Bishnoi
Anode chamber of a dual chamber microbial fuel cell (MFC) having raw landfill leachate was inoculated with consortium of sulphate-reducing bacteria (SRB) and sulphide-oxidizing bacteria (SOB) to study the phylogenetic architecture, function and mutualism of anolyte community developed in the reactor. Enriched microbial community was analysed with the help of Illumina MiSeq and indicated the dominance of Firmicutes (41.4%), Clostridia (36.4%) and Clostridium (12.9%) at phylum, class and genus level, respectively...
May 23, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28536911/hydrological-connectivity-and-burkholderia-pseudomallei-prevalence-in-wetland-environments-investigating-rice-farming-community-s-risk-of-exposure-to-melioidosis-in-north-east-thailand
#16
C Joon Chuah, Esther K H Tan, Rasana W Sermswan, Alan D Ziegler
In our analysis of 136 water samples from wetland environments (rice paddies, natural wetland sites, man-made water bodies) in rural areas of North-East Thailand, Burkholderia pseudomallei was most prevalent in rice paddies (15 of the 30 positive sites). The high prevalence in the water of rice fields is indicative of the inherent vulnerability of farmers in rural agricultural areas in this area of Thailand and likely other locations in the tropics. Nearly all B. pseudomallei-positive sites were found within the vicinity of a large wetland associated with the Chi River, in the month of July 2014...
June 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28536531/caffeine-and-bicarbonate-for-speed-a-meta-analysis-of-legal-supplements-potential-for-improving-intense-endurance-exercise-performance
#17
REVIEW
Peter M Christensen, Yusuke Shirai, Christian Ritz, Nikolai B Nordsborg
A 1% change in average speed is enough to affect medal rankings in intense Olympic endurance events lasting ~45 s to 8 min which for example includes 100 m swimming and 400 m running (~1 min), 1,500 m running and 4000 m track cycling (~4 min) and 2,000 m rowing (~6-8 min). To maximize the likelihood of winning, athletes utilizes legal supplements with or without scientifically documented beneficial effects on performance. Therefore, a continued systematic evidence based evaluation of the possible ergogenic effects is of high importance...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28536248/the-signaling-lipid-phosphatidylinositol-3-5-bisphosphate-targets-plant-clc-a-anion-h-exchange-activity
#18
Armando Carpaneto, Anna Boccaccio, Laura Lagostena, Eleonora Di Zanni, Joachim Scholz-Starke
Phosphatidylinositol-3,5-bisphosphate (PI(3,5)P2) is a low-abundance signaling lipid associated with endo-lysosomal and vacuolar membranes in eukaryotic cells. Recent studies on Arabidopsis indicated a critical role of PI(3,5)P2 in vacuolar acidification and morphology during ABA-induced stomatal closure, but the molecular targets in plant cells remained unknown. By using patch-clamp recordings on Arabidopsis vacuoles, we show here that PI(3,5)P2 does not affect the activity of vacuolar H(+)-pyrophosphatase or vacuolar H(+)-ATPase...
May 23, 2017: EMBO Reports
https://www.readbyqxmd.com/read/28534671/silver-nitrate-aspiration-a-potentially-life-threatening-complication
#19
Stijn Bekkers, Johannes A Rijken, Johannes M A Daniels, Rico N P M Rinkel, Jan-Jaap Hendrickx, Simone E J Eerenstein
No abstract text is available yet for this article.
May 23, 2017: American Journal of Respiratory and Critical Care Medicine
https://www.readbyqxmd.com/read/28534126/optimization-of-continuous-flow-solid-phase-denitrification-via-coupling-carriers-in-enhancing-simultaneous-removal-of-nitrogen-and-organics-for-agricultural-runoff-purification
#20
Yi Lu, Xiaoqing Zhang, Lijuan Feng, Guangfeng Yang, Zhou Zheng, Junzhi Liu, Jun Mu
Coupling of biodegradable corncob and plastic carrier was optimized in continuous-flow solid-phase denitrification systems for enhancing simultaneously removal of nitrogen and organics in agricultural runoff. In compared with preposition of plastic carriers and mixed distribution method, it was demonstrated that the preposition of corncobs simultaneously enhanced nitrate (6.64 ± 1.35 mg L(-1) day (-1)) and organics removal (6.33 ± 1.44 mg L(-1) day(-1)) at a hydraulic retention time (HRT) of 6 h...
May 22, 2017: Biodegradation
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