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https://www.readbyqxmd.com/read/28532657/mechanistic-link-between-diesel-exhaust-particles-and-respiratory-reflexes
#1
Ryan K Robinson, Mark A Birrell, John J Adcock, Michael A Wortley, Eric D Dubuis, Shu Chen, Catriona M McGilvery, Sheng Hu, Milo Sp Shaffer, Sara J Bonvini, Sarah A Maher, Ian S Mudway, Alexandra E Porter, Chris Carlsten, Teresa D Tetley, Maria G Belvisi
BACKGROUND: Diesel exhaust particles (DEP) are a major component of particulate matter in Europe's largest cities and epidemiological evidence links exposure with respiratory symptoms and asthma exacerbations. Respiratory reflexes are responsible for symptoms and are regulated by vagal afferent nerves which innervate the airway. It is not known how DEP exposure activates airway afferents to elicit symptoms such as cough and bronchospasm. OBJECTIVE: To identify the mechanisms involved in the activation of airway sensory afferents by DEPs...
May 19, 2017: Journal of Allergy and Clinical Immunology
https://www.readbyqxmd.com/read/28532621/an-experimental-study-on-thermo-catalytic-pyrolysis-of-plastic-waste-using-a-continuous-pyrolyser
#2
Anthony R Auxilio, Wei-Lit Choo, Isha Kohli, Srikanth Chakravartula Srivatsa, Sankar Bhattacharya
A bench scale, two-stage, thermo-catalytic reactor equipped with a continuous feeding system was used to pyrolyse pure and waste plastics. Experiments using five zeolitic and clay-based catalysts of different forms (pellet and powders) and different plastic feedstocks - virgin HDPE, HDPE w1aste and mixed plastic waste (MPW) were compared to the control experiments - pyrolysis without catalyst. Results indicated that the two pelletized catalysts were the most promising for the conditions employed. Of these two, one with higher acidity and surface area was highly selective for the gasoline fraction (C5-C11) giving 80% from the total medium distillate conversion using virgin HDPE as feedstock...
May 19, 2017: Waste Management
https://www.readbyqxmd.com/read/28530097/total-particle-number-emissions-from-modern-diesel-natural-gas-and-hybrid-heavy-duty-vehicles-during-on-road-operation
#3
Tianyang Wang, David Christopher Quiros, Arvind Thiruvengadam, Saroj Pradhan, Shaohua Hu, Tao Huai, Eon S Lee, Yifang Zhu
Particle emissions from heavy-duty vehicles (HDVs) have significant environmental and public health impacts. This study measured total particle number emission factors (PNEFs) from six newly-certified HDVs powered by diesel and compressed natural gas totaling over 6,800 miles of on-road operation in California. Distance-, fuel- and work-based PNEFs were calculated for each vehicle. Distance-based PNEFs of vehicles equipped with original equipment manufacturer (OEM) diesel particulate filters (DPFs) in this study have decreased by 355-3200 times compared to a previous retrofit DPF dynamometer study...
May 22, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28528415/oxidative-stress-in-shellfish-sinonovacula-constricta-exposed-to-the-water-accommodated-fraction-of-zero-sulfur-diesel-oil-and-pinghu-crude-oil
#4
Mei Jiang, Lei Li, Yingren Li, Gongming Shen, Xinqiang Shen
This study investigated the oxidative stress of the water accommodated fraction (WAF) of zero sulfur diesel oil and Pinghu crude oil on Sinonovacula constricta, respectively. The oxidative stress of oil pollutants on organisms was measured by typical antioxidases, such as SOD, CAT, GST, and POD. Toxicity was quantitatively evaluated by combining IBR (integrated biomarker responses). Results demonstrated that different concentrations of oil caused different degrees of induction to the four antioxidases. Compared with the control group, all test groups presented enzyme induction or inhibition during exposure period...
May 20, 2017: Archives of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28522830/inhibition-of-endocytic-lipid-antigen-presentation-by-common-lipophilic-environmental-pollutants
#5
Manju Sharma, Xiang Zhang, Shuangmin Zhang, Liang Niu, Shuk-Mei Ho, Aimin Chen, Shouxiong Huang
Environmental pollutants as non-heritable factors are now recognized as triggers for multiple human inflammatory diseases involving T cells. We postulated that lipid antigen presentation mediated by cluster of differentiation 1 (CD1) proteins for T cell activation is susceptible to lipophilic environmental pollutants. To test this notion, we determined whether the common lipophilic pollutants benzo[a]pyrene and diesel exhaust particles impact on the activation of lipid-specific T cells. Our results demonstrated that the expression of CD1a and CD1d proteins, and the activation of CD1a- and CD1d-restricted T cells were sensitively inhibited by benzo[a]pyrene even at the low concentrations detectable in exposed human populations...
May 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28521956/comparative-life-cycle-assessment-of-alternative-strategies-for-energy-recovery-from-used-cooking-oil
#6
Lidia Lombardi, Barbara Mendecka, Ennio Carnevale
The separate collection of Used Cooking Oil (UCO) is gaining popularity through several countries in Europe. An appropriate management of UCO waste stream leads to substantial benefits. In this study, we analyse two different possibilities of UCO energy reuse: the direct feed to a reciprocating internal combustion engine (ICE) for cogeneration purpose, and the processing to generate biodiesel. Concerning biodiesel production, we analyse four among conventional and innovative technologies, characterised by different type and amount of used chemicals, heat and electricity consumptions and yields...
May 15, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28512709/influence-of-low-temperature-combustion-and-dimethyl-ether-diesel-blends-on-performance-combustion-and-emission-characteristics-of-common-rail-diesel-engine-a-cfd-study
#7
Venkatesh Tavareppa Lamani, Ajay Kumar Yadav, Kumar Gottekere Narayanappa
Due to presence of more oxygen, absence of carbon-carbon (C-C) bond in chemical structure, and high cetane number of dimethyl ether (DME), pollution from DME operated engine is less compared to diesel engine. Hence, the DME can be a promising alternative fuel for diesel engine. The present study emphasizes the effect of various exhaust gas recirculation (EGR) rates (0-20%) and DME/Diesel blends (0-20%) on combustion characteristics and exhaust emissions of common rail direct injection (CRDI) engine using three-dimensional computational fluid dynamics (CFD) simulation...
May 16, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28511647/low-smoke-chulha-in-indian-slums-study-protocol-for-a-randomised-controlled-trial
#8
Megha Thakur, Esther A Boudewijns, Giridhara R Babu, Bjorn Winkens, Luc P de Witte, Jeroen Gruiskens, Preeti Sushama, Cristian T Ghergu, Onno C P van Schayck
BACKGROUND: Biomass fuel is used as a primary cooking source by more than half of the world's population, contributing to a high burden of disease. Although cleaner fuels are available, some households continue using solid fuels because of financial constraints and absence of infrastructure, especially in non-notified slums. The present study documents a randomised controlled study investigating the efficacy of improved cookstove on the personal exposure to air pollution and the respiratory health of women and children in an Indian slum...
May 16, 2017: BMC Public Health
https://www.readbyqxmd.com/read/28511360/refined-2013-based-vehicle-emission-inventory-and-its-spatial-and-temporal-characteristics-in-zhengzhou-china
#9
Mimi Gong, Shasha Yin, Xingke Gu, Yuanqian Xu, Nan Jiang, Ruiqin Zhang
Vehicle emission is becoming one of the most important pollution sources because of the increase in vehicle population and activity in China. A more reasonable and complete vehicle emission inventory in Zhengzhou for the year 2013 was developed in this study. This inventory is suitable for local emission factors and vehicle kilometers of travel. Estimates show that the total carbon monoxide (CO), hydrocarbon (HC), nitrogen oxide (NOX), particulate matter (PM2.5 and PM10) and sulfur dioxide (SO2) emissions were 291Gg, 35Gg, 106Gg, 6Gg, 7Gg, and 3Gg, respectively...
May 12, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28505629/impacts-and-mitigation-of-excess-diesel-related-nox-emissions-in-11-major-vehicle-markets
#10
Susan C Anenberg, Joshua Miller, Ray Minjares, Li Du, Daven K Henze, Forrest Lacey, Christopher S Malley, Lisa Emberson, Vicente Franco, Zbigniew Klimont, Chris Heyes
Vehicle emissions contribute to fine particulate matter (PM2.5) and tropospheric ozone air pollution, affecting human health, crop yields and climate worldwide. On-road diesel vehicles produce approximately 20 per cent of global anthropogenic emissions of nitrogen oxides (NOx), which are key PM2.5 and ozone precursors. Regulated NOx emission limits in leading markets have been progressively tightened, but current diesel vehicles emit far more NOx under real-world operating conditions than during laboratory certification testing...
May 15, 2017: Nature
https://www.readbyqxmd.com/read/28502054/light-absorption-of-biomass-burning-and-vehicle-emission-sourced-carbonaceous-aerosols-of-the-tibetan-plateau
#11
Zhaofu Hu, Shichang Kang, Chaoliu Li, Fangping Yan, Pengfei Chen, Shaopeng Gao, Zhiyong Wang, Yulan Zhang, Mika Sillanpää
Carbonaceous aerosols over the Tibetan Plateau originate primarily from biomass burning and vehicle emissions (BB and VEs, respectively). The light absorption characteristics of these carbonaceous aerosols are closely correlated with the burning conditions and represent key factors that influence climate forcing. In this study, the light absorption characteristics of elemental carbon (EC) and water-soluble organic carbon (WSOC) in PM2.5 (fine particulate matter smaller than 2.5 μm) generated from BB and VEs were investigated over the Tibetan Plateau (TP)...
May 14, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28500154/suspected-adverse-events-2015
#12
S Cooles, G Diesel, J Blenkinsop
The following article has been produced by the pharmacovigilance unit at the Veterinary Medicines Directorate (VMD) to provide a summary of some of the results from its surveillance work carried out in 2015Decrease in number of reports for food-producing speciesIncrease in number of pet animal reportsReports of dogs affected by medicines intended for large animals.
May 13, 2017: Veterinary Record
https://www.readbyqxmd.com/read/28498495/oleaginous-yeasts-promising-platforms-for-the-production-of-oleochemicals-and-biofuels
#13
José L Adrio
Oleaginous yeasts have a unique physiology that makes them the best suited hosts for the production of lipids, oleochemicals and diesel-like fuels. Their high lipogenesis, capability of growing on many different carbon sources (including lignocellulosic sugars), easy large-scale cultivation, and an increasing number of genetic tools are some of the advantages that have encouraged their use to develop sustainable processes. This mini-review summarizes the metabolic engineering strategies developed in oleaginous yeasts within the last two years to improve process metrics (titer, yield and productivity) for the production of lipids, free fatty acids, fatty acid-based chemicals (eg...
May 12, 2017: Biotechnology and Bioengineering
https://www.readbyqxmd.com/read/28497299/ecotoxicological-and-health-risk-assessment-of-polycyclic-aromatic-hydrocarbons-pahs-in-short-neck-clam-paphia-undulata-and-contaminated-sediments-in-malacca-strait-malaysia
#14
Mehrzad Keshavarzifard, Mohamad Pauzi Zakaria, Reza Sharifi
The distribution, sources, and human health risk assessment of polycyclic aromatic hydrocarbons (PAHs) in surface sediment and the edible tissue of short-neck clam (Paphia undulata) from mudflat ecosystem in the west coast of Malaysia were investigated. The concentrations of ∑16 PAHs varied from 347.05 to 6207.5 and 179.32 to 1657.5 ng g(-1) in sediment and short-neck clam samples, respectively. The calculations of mean PEL quotients (mean-PELQs) showed that the ecological risk of PAHs in the sediment samples was low to moderate-high level, whereas the total health risk through ingestion and dermal contact was considerably high...
May 11, 2017: Archives of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28495853/transgenerational-transmission-of-asthma-risk-after-exposure-to-environmental-particles-during-pregnancy
#15
David J Gregory, Lester Kobzik, Zhiping Yang, Connor C McGuire, Alexey V Fedulov
Exposure to environmental particles during pregnancy increases asthma susceptibility of the offspring. We tested the hypothesis that this transmission continues to F2 and F3 generations and occurs via epigenetic mechanisms. We compared allergic susceptibility of three generations of BALB/c offspring after a single maternal exposure during pregnancy to diesel exhaust particles or concentrated urban air particles. After pregnant dams received intranasal instillations of particle suspensions or control, their F1, F2 and F3 offspring were tested in a low-dose ovalbumin protocol for allergy sensitivity...
May 11, 2017: American Journal of Physiology. Lung Cellular and Molecular Physiology
https://www.readbyqxmd.com/read/28495378/performance-of-biomorphic-silicon-carbide-as-particulate-filter-in-diesel-boilers
#16
M Pilar Orihuela, Aurora Gómez-Martín, José A Becerra, Ricardo Chacartegui, Joaquín Ramírez-Rico
Biomorphic Silicon Carbide (bioSiC) is a novel porous ceramic material with excellent mechanical and thermal properties. Previous studies have demonstrated that it may be a good candidate for its use as particle filter media of exhaust gases at medium or high temperature. In order to determine the filtration efficiency of biomorphic Silicon Carbide, and its adequacy as substrate for diesel particulate filters, different bioSiC-samples have been tested in the flue gases of a diesel boiler. For this purpose, an experimental facility to extract a fraction of the boiler exhaust flow and filter it under controlled conditions has been designed and built...
May 8, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28493965/assessing-the-greenhouse-gas-emissions-of-brazilian-soybean-biodiesel-production
#17
Carlos Eduardo Pellegrino Cerri, Xin You, Maurício Roberto Cherubin, Cindy Silva Moreira, Guilherme Silva Raucci, Bruno de Almeida Castigioni, Priscila Aparecida Alves, Domingos Guilherme Pellegrino Cerri, Francisco Fujita de Castro Mello, Carlos Clemente Cerri
Soybean biodiesel (B100) has been playing an important role in Brazilian energy matrix towards the national bio-based economy. Greenhouse gas (GHG) emissions is the most widely used indicator for assessing the environmental sustainability of biodiesels and received particular attention among decision makers in business and politics, as well as consumers. Former studies have been mainly focused on the GHG emissions from the soybean cultivation, excluding other stages of the biodiesel production. Here, we present a holistic view of the total GHG emissions in four life cycle stages for soybean biodiesel...
2017: PloS One
https://www.readbyqxmd.com/read/28484799/distribution-of-anaerobic-hydrocarbon-degrading-bacteria-in-soils-from-king-george-island-maritime-antarctica
#18
Dayanna Souza Sampaio, Juliana Rodrigues Barboza Almeida, Hugo E de Jesus, Alexandre S Rosado, Lucy Seldin, Diogo Jurelevicius
Anaerobic diesel fuel Arctic (DFA) degradation has already been demonstrated in Antarctic soils. However, studies comparing the distribution of anaerobic bacterial groups and of anaerobic hydrocarbon-degrading bacteria in Antarctic soils containing different concentrations of DFA are scarce. In this study, functional genes were used to study the diversity and distribution of anaerobic hydrocarbon-degrading bacteria (bamA, assA, and bssA) and of sulfate-reducing bacteria (SRB-apsR) in highly, intermediate, and non-DFA-contaminated soils collected during the summers of 2009, 2010, and 2011 from King George Island, Antarctica...
May 8, 2017: Microbial Ecology
https://www.readbyqxmd.com/read/28483367/energy-environmental-and-operation-aspects-of-a-srf-fired-fluidized-bed-waste-to-energy-plant
#19
Sabino De Gisi, Agnese Chiarelli, Luca Tagliente, Michele Notarnicola
A methodology based on the ISO 14031:2013 guideline has been developed and applied to a full-scale fluidized bed waste to energy plant (WtE) burning solid recovered fuel (SRF). With reference to 3years of operation, the data on energy and environmental performance, on raw materials consumptions such as sand and diesel fuel, accidental reasons of plant shutdown, have been acquired and analyzed. The obtained results have allowed to quantify the energy and environmental performance of the WtE plant under investigation by varying the amount and mixings of the inlet waste, available in form of thickened and fluff (similar to coriander) SRF...
May 5, 2017: Waste Management
https://www.readbyqxmd.com/read/28465192/lung-inflammation-and-genotoxicity-in-mice-lungs-after-pulmonary-exposure-to-candle-light-combustion-particles
#20
Astrid Skovmand, Ana Cecilia Damiao Gouveia, Ismo Kalevi Koponen, Peter Møller, Steffen Loft, Martin Roursgaard
Candle burning produces a large amount of particles that contribute substantially to the exposure to indoor particulate matter. The exposures to various types of combustion particles, such as diesel exhaust particles, have been associated with increased risk of lung cancer by mechanisms that involve oxidative stress, inflammation and genotoxicity. The aim of this study was to compare pulmonary effects of candle light combustion particles (CP) with two benchmark diesel exhaust particles (A-DEP and SRM2975). Intratracheal (i...
April 29, 2017: Toxicology Letters
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