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https://www.readbyqxmd.com/read/28738621/determining-heterocyclic-aromatic-amines-in-aqueous-samples-a-novel-dispersive-liquid-liquid-micro-extraction-method-based-on-solidification-of-floating-organic-drop-and-ultrasound-assisted-back-extraction-followed-by-uplc-ms-ms
#1
Romina Canales, María Guiñez, Cristian Bazán, Mario Reta, Soledad Cerutti
A novel dispersive liquid-liquid microextraction based on solidification of floating organic droplet combined with ultrasound assisted back extraction for the determination of four heterocyclic aromatic amines in natural water samples prior ultra high-performance liquid chromatography-tandem mass spectrometry was developed. The analytes were extracted from the water samples by a dispersive liquid-liquid microextraction procedure based on solidification of floating organic drop, which was performed by a mixture composed by a less dense than water extraction solvent, 1-undecanol, and a dispersive solvent, methanol...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28735604/measuring-home-environments-across-cultures-invariance-of-the-home-scale-across-eight-international-sites-from-the-mal-ed-study
#2
Paul C Jones, Laura L Pendergast, Barbara A Schaefer, Muneera Rasheed, Erling Svensen, Rebecca Scharf, Rita Shrestha, Angelina Maphula, Reeba Roshan, Zeba Rasmussen, Jessica C Seidman, Laura E Murray-Kolb
The home environment provides the context for much of a child's early development. Examples of important aspects of the home environment include safety, cleanliness, and opportunities for cognitive stimulation. This study sought to examine the psychometric properties of an adapted form of the Home Observation for the Measurement of the Environment (HOME; Caldwell & Bradley, 1984, 2003) across the eight international sites of the MAL-ED project (Dhaka, Bangladesh; Vellore, India; Bhakatapur, Nepal; Naushahro Feroze, Pakistan; Fortaleza, Brazil; Loreto, Peru; Venda, South Africa; Haydom, Tanzania), to identify a factor structure that fit the data at all sites, and to derive a subset of items that could be used to examine home environmental characteristics across sites...
October 2017: Journal of School Psychology
https://www.readbyqxmd.com/read/28734349/integrated-preservation-and-sample-clean-up-procedures-for-studying-water-ingestion-by-recreational-swimmers-via-urinary-biomarker-determination
#3
Ricardo Cantú, Jody A Shoemaker, Catherine A Kelty, Larry J Wymer, Thomas D Behymer, Alfred P Dufour, Matthew L Magnuson
The use of cyanuric acid as a biomarker for ingestion of swimming pool water may lead to quantitative knowledge of the volume of water ingested during swimming, contributing to a better understanding of disease resulting from ingestion of environmental contaminants. When swimming pool water containing chlorinated cyanurates is inadvertently ingested, cyanuric acid is excreted quantitatively within 24 h as a urinary biomarker of ingestion. Because the volume of water ingested can be quantitatively estimated by calculation from the concentration of cyanuric acid in 24 h urine samples, a procedure for preservation, cleanup, and analysis of cyanuric acid was developed to meet the logistical demands of large scale studies...
August 22, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28732884/environmental-friendly-and-magnetic-silanized-ethyl-cellulose-sponges-as-effective-and-recyclable-oil-absorption-materials
#4
Yeqiang Lu, Yue Wang, Lejing Liu, Weizhong Yuan
Ethyl cellulose (EC), owing to its wide availability, environmental-friendliness, and intrinsic hydrophobicity/oleophilicity, was used as an absorbent material for the first time. The superhydrophobic magnetic EC sponges with low density and high porosity were facilely prepared via freeze-drying method. The superhydrophobicity and magnetism of the sponges were achieved by silanization EC with hexadecyltrimethoxysilane and mixing with ferroferric oxide (Fe3O4) nanoparticles. The as-prepared magnetic silanized EC (MSEC) sponges showed stable superhydrophobicity (θwater>150°, rolling contact angle: 7°) in several kinds of solutions...
October 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28732304/outbreak-of-salmonella-enteritidis-pt14b-gastroenteritis-at-a-restaurant-in-england-the-use-of-molecular-typing-to-achieve-a-successful-prosecution
#5
C Chatt, D Nicholds-Trainor, A Scrivener, S Suleman, M Harvey, T Dallman, J Hawker, B Sibal
OBJECTIVES: To describe an outbreak of Salmonella enteritidis phage type (PT) 14b in people who had eaten at a restaurant, and the investigation and subsequent prosecution of the food business operator (FBO). STUDY DESIGN: The local health protection team and environmental health department formed an outbreak control team to investigate the outbreak. METHODS: Epidemiological, microbiological, and environmental investigations were undertaken...
July 18, 2017: Public Health
https://www.readbyqxmd.com/read/28732033/spatial-and-simultaneous-representative-seroprevalence-of-anti-toxoplasma-gondii-antibodies-in-owners-and-their-domiciled-dogs-in-a-major-city-of-southern-brazil
#6
Aline do Nascimento Benitez, Felippe Danyel Cardoso Martins, Marcelle Mareze, Nelson Jessé Rodrigues Santos, Fernanda Pinto Ferreira, Camila Marinelli Martins, João Luis Garcia, Regina Mitsuka-Breganó, Roberta Lemos Freire, Alexander Welker Biondo, Italmar Teodorico Navarro
Toxoplasmosis, caused by Toxoplasma gondii, has traditionally been considered an important water and foodborne protozoonosis with important public health considerations. Although felids play a well-established role as definitive hosts, canine epidemiological involvement in the parasite's life cycle remains questionable and controversial. The increasing closeness of the human-dog bond, particularly seen in urban settings, has been recognized as a historically unprecedented worldwide movement. Sharing daily lives in the same households, dogs may be exposed to similar associated risks of T...
2017: PloS One
https://www.readbyqxmd.com/read/28730647/swimming-pools-and-fungi-an-epidemiology-survey-in-polish-indoor-swimming-facilities
#7
Marek Jankowski, Anna Charemska, Rafał Czajkowski
Environmental conditions for swimming facilities may support fungal growth and also may represent a biological risk for users. However, since previously published studies both cleaning procedures and sanitary regulations are likely to have been improved. The aim of the study was to examine whether attendance to public swimming pools was still a risk factor for fungal infection of the skin in Poland. We investigated the occurrence of mycotic species, in a sample from Polish swimming pools. Detection and identification of isolated species were achieved by cultural and morphological methods...
July 20, 2017: Mycoses
https://www.readbyqxmd.com/read/28728048/accumulation-and-detoxification-dynamics-of-chromium-and-antioxidant-responses-in-juvenile-rare-minnow-gobiocypris-rarus
#8
Cong Yuan, Meng Li, Yao Zheng, Ying Zhou, Feili Wu, Zaizhao Wang
Hexavalent chromium (Cr(6+)) compounds are hazardous via all exposure routes. To explore the dynamics of Cr accumulation and elimination and to reveal the mechanisms underlying detoxification and antioxidation in juvenile Gobiocypris rarus, one-month old G. rarus larvae were exposed to 0.1mgL(-1) Cr(6+) for four weeks for accumulation and subsequently placed to clean water for another week for depuration. The contents of Cr were measured weekly in the whole body of G. rarus juveniles. The activities of catalase (CAT), glutathione peroxidase (GPx), superoxide dismutase (SOD), glutathione S-transferase (GST) and glutathione reductase (GR), and contents of glutathione (GSH) and malonaldehyde (MDA), and transcripts of cat, Cu/Zn-sod, Mn-sod, gpx1, gstpi, gr, mt1, nrf2 and uba52 were determined...
July 11, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28725556/de-novo-transcriptome-assembly-for-the-lung-of-the-ornamented-pygmy-frog-microhyla-fissipes
#9
Lusha Liu, Shouhong Wang, Lanying Zhao, Jianping Jiang
Microhyla fissipes, belonging to Neobatrachia, is a new model organism to study developmental biology, adaptive mechanisms from aquatic to terrestrial life, environmental toxicology, and human disease. M. fissipes use of lungs soon after hatching makes it extremely valuable for the study of lung function and development mechanisms. However, our knowledge of genes and pathways associated with lung development in M. fissipes is very limited. In this study, we conducted de novo transcriptome assembly for the lung of M...
September 2017: Genomics Data
https://www.readbyqxmd.com/read/28719082/determination-of-seven-drugs-of-abuse-and-their-metabolites-in-surface-and-waste-water-using-solid-phase-extraction-coupled-to-liquid-chromatography-with-high-resolution-mass-spectrometry
#10
Helena Prosen, Núria Fontanals, Francesc Borrull, Rosa Maria Marcé
A method based on liquid chromatography with electrospray ionization high-resolution mass spectrometry (Exactive Orbitrap) combined with solid-phase extraction using a strong cationic exchange mixed-mode sorbent has been developed for the determination of seven drugs of abuse, including two synthetic cathinones, as well as some of their metabolites in environmental water samples. The method provides low detection limits and a high confirmation power thanks to the diagnostic and two fragment ions monitored for each compound in high-resolution mass spectrometry, providing six identification points for each analyte...
July 18, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28714443/a-spanish-language-risk-perception-survey-for-developing-diabetes-translation-process-and-assessment-of-psychometric-properties
#11
Kevin L Joiner, Rosa Maria Sternberg, Christine Kennedy, Jyu-Lin Chen, Yoshimi Fukuoka, Susan L Janson
BACKGROUND AND PURPOSE: Create a Spanish-language version of the Risk Perception Survey for Developing Diabetes (RPS-DD) and assess psychometric properties. RESEARCH DESIGN AND METHODS: The Spanish-language version was created through translation, harmonization, and presentation to the tool's original author. It was field tested in a foreignborn Latino sample and properties evaluated in principal components analysis. RESULTS: Personal Control, Optimistic Bias, and Worry multi-item Likert subscale responses did not cluster together...
December 1, 2016: Journal of Nursing Measurement
https://www.readbyqxmd.com/read/28712080/elemental-and-isotopic-determination-of-lead-pb-in-particulate-matter-in-the-brazilian-city-of-goi%C3%A3-nia-go-using-icp-ms-technique
#12
Hendryk Gemeiner, Thiago de Araujo Dourado, Everton Tiago Sulato, Juliana Aparecida Galhardi, Ana Carla Fernandes Gomes, Eduardo de Almeida, Amauri Antonio Menegário, Didier Gastmans, Chang Hung Kiang
The toxic metal lead (Pb) can be harmful to human health in various manners, but is also considered as a distinguished tracer of environmental pollution since the relative abundance of its four stable isotopes with the atomic masses of 204, 206, 207, and 208 varies with the emission source. This study is focused on the Pb concentrations and isotope ratios in the particulate matter of the Brazilian city of Goiânia in order to determine the main Pb emission sources. Particulate matter samples were collected on clean Teflon filters during rainy and dry season in 2014 in the center of Goiânia city near main roads with a high traffic volume...
July 15, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28711060/native-point-defects-on-hydrogen-passivated-4h-sic-0001-surface-and-the-effects-on-metal-adsorptions
#13
Tingting Wang, Guiwu Liu, Yuanyuan Li, Haigang Hou, Ziwei Xu, Mingsong Wang, Guanjun Qiao
With the continued expansion of silicon carbide's (SiC) applications, atomistic understanding on the native point defects of its surfaces, particularly on those of the hydrogen-passivated (HP) 4H-SiC (0001) surface, becomes imperative. Using first-principles calculations, the structures and formation energies of several typical native point defects (e.g., ISi, IC, VSi, VC, and SiC) on the (0001) HP-surface of 4H-SiC were systematically explored, including the effects of the unit cell size, environmental condition, charge state, and hydrogen incorporation...
July 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28710404/assuring-quality-in-microplastic-monitoring-about-the-value-of-clean-air-devices-as-essentials-for-verified-data
#14
Charlotte Wesch, Anna Maria Elert, Manuel Wörner, Ulrike Braun, Roland Klein, Martin Paulus
Avoiding aerial microfibre contamination of environmental samples is essential for reliable analyses when it comes to the detection of ubiquitous microplastics. Almost all laboratories have contamination problems which are largely unavoidable without investments in clean-air devices. Therefore, our study supplies an approach to assess background microfibre contamination of samples in the laboratory under particle-free air conditions. We tested aerial contamination of samples indoor, in a mobile laboratory, within a laboratory fume hood and on a clean bench with particles filtration during the examining process of a fish...
July 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28706190/clean-power-generation-from-the-intractable-natural-coalfield-fires-turn-harm-into-benefit
#15
Bobo Shi, Hetao Su, Jinshi Li, Haining Qi, Fubao Zhou, José L Torero, Zhongwei Chen
The coal fires, a global catastrophe for hundreds of years, have been proved extremely difficult to control, and hit almost every coal-bearing area globally. Meanwhile, underground coal fires contain tremendous reservoir of geothermal energy. Approximately one billion tons of coal burns underground annually in the world, which could generate ~1000 GW per annum. A game-changing approach, environmentally sound thermal energy extraction from the intractable natural coalfield fires, is being developed by utilizing the waste energy and reducing the temperature of coalfield fires at the same time...
July 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28702919/experimental-investigation-of-performance-and-emissions-of-a-vcr-diesel-engine-fuelled-with-n-butanol-diesel-blends-under-varying-engine-parameters
#16
Ashish Nayyar, Dilip Sharma, Shyam Lal Soni, Alok Mathur
The continuous rise in the cost of fossil fuels as well as in environmental pollution has attracted research in the area of clean alternative fuels for improving the performance and emissions of internal combustion (IC) engines. In the present work, n-butanol is treated as a bio-fuel and investigations have been made to evaluate the feasibility of replacing diesel with a suitable n-butanol-diesel blend. In the current research, an experimental investigation was carried out on a variable compression ratio CI engine with n-butanol-diesel blends (10-25% by volume) to determine the optimum blending ratio and optimum operating parameters of the engine for reduced emissions...
July 13, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28702627/clean-air-in-the-anthropocene
#17
Jos Lelieveld
In atmospheric chemistry, interactions between air pollution, the biosphere and human health, often through reaction mixtures from both natural and anthropogenic sources, are of growing interest. Massive pollution emissions in the Anthropocene have transformed atmospheric composition to the extent that biogeochemical cycles, air quality and climate have changed globally and partly profoundly. It is estimated that mortality attributable to outdoor air pollution amounts to 4.33 million individuals per year, associated with 123 million years of life lost...
July 12, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28702601/modeling-the-kinetics-of-cobalt-fischer-tropsch-catalyst-deactivation-trends-through-an-innovative-modified-weibull-distribution
#18
Mahdi Khorashadizadeh, Hossein Atashi
Since the increase in clean energy demand is driven by environmental concerns, energy management is an ever-lasting issue globally. Among the different scenarios for energy manufacturing, the catalytic route through the famous process named Fischer-Tropsch Synthesis provides beneficial consequences including pollution reduction and economic efficiency, among others. In this regard, catalyst stability must be taken into account as a crucial performance parameter, especially in the expensive cobalt-catalyzed CO hydrogenation processes...
July 12, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28698020/first-outbreak-of-colonization-by-linezolid-and-glycopeptide-resistant-enterococcus-faecium-harbouring-the-cfr-gene-in-a-uk-nephrology-unit
#19
Teresa Inkster, John Coia, Danièle Meunier, Michel Doumith, Kate Martin, Rachel Pike, Laura Imrie, Hayley Kane, Marlene Hay, Camilla Wiuff, Julie Wilson, Chris Deighan, Katie L Hopkins, Neil Woodford, Robert Hill
AIM: To describe an outbreak of colonization by linezolid- and glycopeptide-resistant Enterococcus faecium harbouring the cfr gene, in a UK nephrology unit. METHODS: Isolates of linezolid-resistant E. faecium were typed by PFGE and examined by PCR and sequencing for the transmissible cfr gene that confers resistance to linezolid. Enhanced environmental cleaning, initial and weekly screening of all patients and monitoring of adherence to standard infection control precautions (SICPs) were implemented...
July 8, 2017: Journal of Hospital Infection
https://www.readbyqxmd.com/read/28695254/contamination-and-human-health-risk-assessment-of-polycyclic-aromatic-hydrocarbons-pahs-in-oysters-after-the-wu-yi-san-oil-spill-in-korea
#20
Andrew Loh, Un Hyuk Yim, Sung Yong Ha, Joon Geon An, Moonkoo Kim
After the collision of the Singapore-registered oil tanker M/V Wu Yi San into the oil terminal of Yeosu, Korea on January 31, 2014, approximately 900 m(3) of oil and oil mixture were released from the ruptured pipelines. The oil affected more than 10 km of coastline along Gwangyang Bay. Emergency oil spill responses recovered bulk oil at sea and cleaned up the stranded oil on shore. As part of an emergency environmental impact assessment, region-wide monitoring of oil contamination in oyster had been conducted for 2 months...
July 2017: Archives of Environmental Contamination and Toxicology
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