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https://www.readbyqxmd.com/read/29220765/transient-disturbance-of-engineered-zno-nanoparticles-enhances-the-resistance-and-resilience-of-anammox-process-in-wastewater-treatment
#1
Zheng-Zhe Zhang, Ya-Fei Cheng, Lian-Zeng-Ji Xu, Yu-Hui Bai, Jia-Jia Xu, Zhi-Jian Shi, Qian-Qian Zhang, Ren-Cun Jin
The increasing use of engineered nanoparticles (NPs) in consumer and industrial products raises concerns about their environmental impacts, but their potential influence on anaerobic ammonium oxidation (anammox) process in wastewater treatment remains unknown. In this study, the response of granule-based anammox reactor to different loads of ZnONPs was investigated. The introduction of 1-5mgL-1 ZnONPs did not affect reactor performance, but 90% of the nitrogen removal capacity was deprived by a shock of 10mgL-1 ZnONPs within 3days...
December 5, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29218574/tracking-long-distance-atmospheric-deposition-of-trace-metal-emissions-from-smelters-in-the-upper-columbia-river-valley-using-pb-isotope-analysis-of-lake-sediments
#2
Andrew Wright Child, Barry C Moore, Jeffrey D Vervoort, Marc W Beutel
Heavy metal discharge from mining and smelting operations into aquatic ecosystems can cause long-term biological and ecological impacts. The upper Columbia River is highly contaminated with heavy metal wastes from nearby smelting operations in Trail, British Columbia, Canada, and to a lesser extent, Northport (Le Roi smelter), Washington, USA. Airborne emissions from the Trail operations were historically and are currently transported by prevailing winds down the Columbia River canyon, where particulate metals can be deposited into lakes and watersheds...
December 7, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29216910/perceived-causes-of-stress-among-a-group-of-western-canadian-dental-students
#3
Alyssa Hayes, Jay N Hoover, Chandima P Karunanayake, Gerald S Uswak
OBJECTIVE: The demanding nature of dental education, both academically and clinically, results in higher levels of perceived stress among its students. The aim of this study was to determine how dental students at the College of Dentistry, University of Saskatchewan perceived stress. During the 2013-2014 academic year, all students were asked to complete a modified dental environmental survey (DES). RESULTS: Of the 111 students enrolled at the College that year 92 completed the survey (response rate = 83%)...
December 8, 2017: BMC Research Notes
https://www.readbyqxmd.com/read/29215350/prevalence-and-types-of-campylobacter-on-poultry-farms-and-in-their-direct-environment
#4
Franciska M Schets, Wilma F Jacobs-Reitsma, Rozemarijn Q J van der Plaats, Lianne Kerkhof-De Heer, Angela H A M van Hoek, Raditijo A Hamidjaja, Ana Maria de Roda Husman, Hetty Blaak
To study whether broiler and layer farms contribute to the environmental Campylobacter load, environmental matrices at or close to farms, and caecal material from chickens, were examined. Similarity between Campylobacter from poultry and environment was tested based on species identification and Multilocus Sequence Typing. Campylobacter prevalence in caecal samples was 97% at layer farms (n = 5), and 93% at broiler farms with Campylobacter-positive flocks (n = 2/3). Campylobacter prevalence in environmental samples was 24% at layer farms, and 29% at broiler farms with Campylobacter-positive flocks...
October 2017: Journal of Water and Health
https://www.readbyqxmd.com/read/29215310/apolipoprotein-e4-mediates-insulin-resistance-associated-cerebrovascular-dysfunction-and-the-post-prandial-response
#5
Lance A Johnson, Eileen Ruth Torres, Sydney Weber Boutros, Esha Patel, Tunde Akinyeke, Nabil J Alkayed, Jacob Raber
Metabolic dysfunction, commonly a result of diets high in saturated fats and sugar, is associated with impaired cognitive function and an increased risk of age-related cognitive decline (ACD) and Alzheimer's disease (AD). Compared to the E3 isoform of apolipoprotein (apoE), the E4 isoform is a major genetic risk factor for ACD, AD, and for developing cognitive impairments following various environmental challenges, including dietary challenges such as a high-fat diet (HFD). Both insulin resistance (IR) and E4 are associated with metabolic and vascular impairments...
January 1, 2017: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/29213152/serological-and-molecular-analysis-of-parvovirus-b19-infection-in-mayan-women-with-systemic-lupus-erythematosus-in-mexico
#6
Guillermo Valencia Pacheco, Yumi E Nakazawa Ueji, Edwin A Rodríguez Dzul, Angélica V Angulo Ramírez, Ricardo F López Villanueva, Irma G Quintal Ortiz, Elsy P Rosado Paredes
Background: Systemic lupus erythematosus (SLE) is a systemic autoimmune disease that mainly affects women, characterized by the production of autoantibodies. Its causal agent is unknown, but the combination of environmental, hormonal and genetic factors may favor the development of the disease. Parvovirus B19 has been associated with the development of SLE, since it induces the production of anti-single stranded DNA antibodies. It is unknown whether PV-B19 infection is an environmental factor that trigger or reactivate SLE in the Mexican Mayan population...
September 30, 2017: Colombia Médica: CM
https://www.readbyqxmd.com/read/29211046/building-based-analysis-of-the-spatial-provision-of-urban-parks-in-shenzhen-china
#7
Wenxiu Gao, Qiang Lyu, Xiang Fan, Xiaochun Yang, Jiangtao Liu, Xirui Zhang
Urban parks provide important environmental, social, and economic benefits to people and urban areas. The literature demonstrates that proximity to urban parks is one of the key factors influencing people's willingness to use them. Therefore, the provision of urban parks near residential areas and workplaces is one of the key factors influencing quality of life. This study designed a solution based on the spatial association between urban parks and buildings where people live or work to identify whether people in different buildings have nearby urban parks available for their daily lives...
December 6, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/29209976/do-cemeteries-emit-drugs-a-case-study-from-southern-germany
#8
Sabine Fiedler, Torsten Dame, Matthias Graw
The risk of earth burials for the environment and public health is a matter of controversial debate. The aim of the present study is to characterise the drainage of cemeteries with regard to the concentration of a number of pharmaceuticals and to the soil's hydrochemical properties, and to discuss these data in comparison with data obtained for surface waters located upstream of the cemeteries. Of the 12 drainage samples analysed using LC-ESI-MS/MS, seven contained carbamazepine (< 225 ng l-1), five contained hydrochlorothiazide, one contained metoprolol (23 ng l-1) and one contained traces of ibuprofen...
December 6, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29209683/-construction-and-validation-of-a-tool-for-the-evaluation-of-environmental-risks-and-limitations-to-the-manual-handling-of-loads-cross-sectional-study
#9
G Galeoto, A Sili, M Tamburlani, M Farina, A Mannocci, R Mollica, A Servadio
INTRODUCTION: The manual handling of loads has a strong impact on many types of work. All health professionals, due to their job, are subjected to a high risk of disease from the manual handling of loads. TARGET: The purpose of our work has been therefore the construction and the validation of a specific tool for the evaluation of both environmental risks and individual limitations of the manual handling of loads / patients. MATERIALS AND METHODS: The questionnaire we created is composed of two main sections: the first section includes the registry card of the operator personal data while the second section, consisting of eleven items it is further organized into two sections/parts...
November 2017: La Clinica Terapeutica
https://www.readbyqxmd.com/read/29208531/the-characteristics-of-household-food-waste-in-hong-kong-and-their-implications-for-sewage-quality-and-energy-recovery
#10
Feixiang Zan, Ji Dai, Yuze Hong, Meiyin Wong, Feng Jiang, Guanghao Chen
Food waste (FW) is a worldwide environmental issue due to its huge production amount. FW separation from municipal solid waste followed by different treatment strategies has been widely accepted. Food waste disposer (FWD) is a promising approach to separate and collect household food waste (HFW), which has been widely applied in many countries. However, the feasibility of FWD application in many countries is still being debated due to the major concerns over the impact of FWD on the wastewater treatment plants...
December 2, 2017: Waste Management
https://www.readbyqxmd.com/read/29207973/identifying-models-of-hiv-care-and-treatment-service-delivery-in-tanzania-uganda-and-zambia-using-cluster-analysis-and-delphi-survey
#11
Sharon Tsui, Julie A Denison, Caitlin E Kennedy, Larry W Chang, Olivier Koole, Kwasi Torpey, Eric Van Praag, Jason Farley, Nathan Ford, Leine Stuart, Fred Wabwire-Mangen
BACKGROUND: Organization of HIV care and treatment services, including clinic staffing and services, may shape clinical and financial outcomes, yet there has been little attempt to describe different models of HIV care in sub-Saharan Africa (SSA). Information about the relative benefits and drawbacks of different models could inform the scale-up of antiretroviral therapy (ART) and associated services in resource-limited settings (RLS), especially in light of expanded client populations with country adoption of WHO's test and treat recommendation...
December 6, 2017: BMC Health Services Research
https://www.readbyqxmd.com/read/29207269/actin-networks-adapting-to-load-through-geometry
#12
Klemens Rottner, Frieda Kage
Cell migration frequently involves the protrusion of lamellipodial actin networks, the structure and regulation of which have been studied for decades. New work highlights how the geometry of these networks endows cells with the ability to adapt to environmental conditions and load.
December 4, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/29203647/molecular-basis-for-the-integration-of-environmental-signals-by-furb-from-anabaena-sp-pcc-7120
#13
Violeta C Sein-Echaluce, María Carmen Pallarés, Anabael Lostao, Inmaculada Yruela, Adrián Velázquez-Campoy, M Luisa Peleato, María F Fillat
FUR proteins are among the most important families of transcriptional regulators in prokaryotes, often behaving as global regulators. In the cyanobacterium Anabaena PCC 7120 FurB (Zur) controls zinc and redox homeostasis through the repression of target genes in a zinc-dependent manner. In vitro , nonspecific binding of FurB to DNA elicits protection against oxidative damage and avoids cleavage by DNase I. This study provides for the first time evidence of the influence of redox environment in the interaction of FurB with regulatory zinc and its consequences in FurB-DNA binding affinity...
December 4, 2017: Biochemical Journal
https://www.readbyqxmd.com/read/29202759/effects-of-intramuscularly-administered-enrofloxacin-on-the-susceptibility-of-commensal-intestinal-escherichia-coli-in-pigs-sus-scrofa-domestica
#14
Antje Römer, Gesine Scherz, Saskia Reupke, Jessica Meißner, Jürgen Wallmann, Manfred Kietzmann, Heike Kaspar
BACKGROUND: In the European Union, various fluoroquinolones are authorised for the treatment of food producing animals. Each administration poses an increased risk of development and spread of antimicrobial resistance. The aim of this study was to investigate the impact of parenteral administration of enrofloxacin on the prevalence of enrofloxacin and ciprofloxacin susceptibilities in the commensal intestinal E. coli population. METHODS: E. coli isolates from faeces of twelve healthy pigs were included...
December 4, 2017: BMC Veterinary Research
https://www.readbyqxmd.com/read/29202342/d-tyrosine-loaded-nanocomposite-membranes-for-environmental-friendly-long-term-biofouling-control
#15
Cong Yu, Jinjian Wu, Gilherme Zin, Marco Di Luccio, Donghui Wen, Qilin Li
Strategies to control biofouling without using antimicrobial chemicals are needed to prevent the spread of antibiotic resistance genes and disruption of microbial activities in biological treatment. This study developed an environmentally friendly biofouling resistant membrane by incorporating d-tyrosine onto a commercial nanofiltration membrane using FAU type zeolite nanoparticles that covalently bound to the membrane surface as carriers for slow release. The d-tyrosine loaded membrane had similar water permeability as the unmodified membrane, but greatly reduced initial cell attachment and strongly inhibited subsequent biofilm formation without inactivating the bacteria...
November 14, 2017: Water Research
https://www.readbyqxmd.com/read/29199209/effect-of-hcl-loading-and-ethanol-concentration-over-hcl-activated-clay-catalysts-for-ethanol-dehydration-to-ethylene
#16
Chadaporn Krutpijit, Bunjerd Jongsomjit
Montmorillonite clay (MMT) is one of materials that can be "green material" due to its environmental safety. In this work, acid-activated MMT catalysts were prepared for the dehydration reaction of ethanol. To be the green process, the reaction with bioethanol was also studied. Ethanol concentrations in feed were varied in the range of 10-99.95 wt%. Moreover, the concentrations of hydrochloric acid activated MMT were investigated in range of 0.05-4 M. From the experiment, it reveals that different acid concentrations to activate MMT affect the catalytic activity of catalysts...
2017: Journal of Oleo Science
https://www.readbyqxmd.com/read/29197262/psychometric-evaluation-of-the-environmental-reality-shock-related-issues-and-concerns-instrument-for-newly-graduated-nurses
#17
Eun-Young Kim, Jung Hee Yeo, Hyunjeong Park, Kyung Mi Sin, Cheryl B Jones
BACKGROUND: Reality shock is a critical representation of the gap between nursing education and clinical practice and it is important to explore the level of reality shock among nurses. However, there is no relevant instrument to assess the level of reality shock in South Korea. OBJECTIVES: The purpose of this is to determine the validity and reliability of the Korean version of the Environmental Reality Shock-Related Issues and Concerns instrument. DESIGN: A cross-sectional study design was used in this study...
November 15, 2017: Nurse Education Today
https://www.readbyqxmd.com/read/29196715/optimization-of-segmented-thermoelectric-generator-using-taguchi-and-anova-techniques
#18
Ravi Anant Kishore, Mohan Sanghadasa, Shashank Priya
Recent studies have demonstrated that segmented thermoelectric generators (TEGs) can operate over large thermal gradient and thus provide better performance (reported efficiency up to 11%) as compared to traditional TEGs, comprising of single thermoelectric (TE) material. However, segmented TEGs are still in early stages of development due to the inherent complexity in their design optimization and manufacturability. In this study, we demonstrate physics based numerical techniques along with Analysis of variance (ANOVA) and Taguchi optimization method for optimizing the performance of segmented TEGs...
December 1, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29194017/rhizomucor-miehei-lipase-immobilized-on-reinforced-chitosan-chitin-nanowhiskers-support-for-synthesis-of-eugenyl-benzoate
#19
Fatin Myra Abdul Manan, Nursyafreena Attan, Nashi Widodo, Hassan Y Aboul-Enein, Roswanira Abdul Wahab
An alternative environmentally benign support was prepared from chitosan-chitin nanowhiskers (CS/CNWs) for covalent immobilization of Rhizomucor miehei lipase (RML) to increase the operational stability and recyclability of RML in synthesizing eugenyl benzoate. The CS/CNWs support and RML-CS/CNWs were characterized using X-ray diffraction (XRD), fluorescent microscopy and Fourier transform infrared spectroscopy (FTIR). Efficiency of the RML-CS/CNWs was compared to the free RML to synthesize eugenyl benzoate for parameters: reaction temperature, stirring rate, reusability and thermal stability...
December 1, 2017: Preparative Biochemistry & Biotechnology
https://www.readbyqxmd.com/read/29193806/inhibition-of-larval-growth-and-adult-fecundity-in-asian-long-horned-beetle-anoplophora-glabripennis-exposed-to-azadirachtins-under-quarantine-laboratory-conditions
#20
Dean G Thompson, Amanda Tonon, Eduardo Beltran, Felix Hernandez
BACKGROUND: The Asian Long-horned Beetle (ALB; Anoplophora glabripennis (Motschulsky)), is an invasive, wood-boring insect posing significant economic and ecological threats to the deciduous forests of North America. An efficacious and environmentally acceptable chemical control technique is a requirement of a comprehensive, integrated response strategy. RESULTS: Results of this study demonstrate statistically significant, concentration-dependent effects of azadirachtins, a family of natural compounds derived from the neem tree, on both ALB larval and adult life-stages...
November 28, 2017: Pest Management Science
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