keyword
MENU ▼
Read by QxMD icon Read
search

Ultrafine particles

keyword
https://www.readbyqxmd.com/read/28437087/al-coated-conductive-fibrous-filters-with-low-pressure-drop-for-efficient-electrostatic-capture-of-ultrafine-particulate-pollutants
#1
Dong Yun Choi, Soo-Ho Jung, Dong-Keun Song, Eun Jeong An, Duckshin Park, Tae-Oh Kim, Jae Hee Jung, Hye Moon Lee
Here, we demonstrate a new strategy of air filtration based on an Al-coated conductive fibrous filter for high efficient nanoparticulate removals. The conductive fibrous filter was fabricated by a direct decomposition of Al precursor ink, AlH3{O(C4H9)2}, onto surfaces of a polyester air filter via a cost-effective and scalable solution-dipping process. The prepared conductive filters showed a low sheet resistance (< 1.0 Ω sq(-1)), robust mechanical durability and high oxidative stability. By electrostatic force between the charged fibers and particles, the ultrafine particles of 30 - 400 nm in size were captured with a removal efficiency of ~99...
April 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28434263/plant-protein-based-hydrophobic-fine-and-ultrafine-carrier-particles-in-drug-delivery-systems
#2
Hedieh Malekzad, Hamed Mirshekari, Parham Sahandi Zangabad, S M Moosavi Basri, Fazel Baniasadi, Maryam Sharifi Aghdam, Mahdi Karimi, Michael R Hamblin
For thousands of years, plants and their products have been used as the mainstay of medicinal therapy. In recent years, besides attempts to isolate the active ingredients of medicinal plants, other new applications of plant products, such as their use to prepare drug delivery vehicles, have been discovered. Nanobiotechnology is a branch of pharmacology that can provide new approaches for drug delivery by the preparation of biocompatible carrier nanoparticles (NPs). In this article, we review recent studies with four important plant proteins that have been used as carriers for targeted delivery of drugs and genes...
April 24, 2017: Critical Reviews in Biotechnology
https://www.readbyqxmd.com/read/28432989/the-effect-of-natural-ventilation-strategy-on-indoor-air-quality-in-schools
#3
Luca Stabile, Marco Dell'Isola, Aldo Russi, Angelamaria Massimo, Giorgio Buonanno
In order to reduce children's exposure to pollutants in classrooms a proper ventilation strategy need to be adopted. Such strategy is even more important in naturally ventilated schools where the air exchange rate is only based on the manual airing of classrooms. The present work aimed to evaluate the effect of the manual airing strategy on indoor air quality in Italian classrooms. For this aim, schools located in the Central Italy were investigated. Indoor air quality was studied in terms of CO2, particle number and PM concentrations and compared to corresponding outdoor levels...
April 19, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28411581/silica-nanoparticles-and-lead-acetate-co-exposure-triggered-synergistic-cytotoxicity-in-a549-cells-through-potentiation-of-mitochondria-dependent-apoptosis-induction
#4
Chun-Feng Lu, Li-Zhong Li, Wei Zhou, Jun Zhao, Yi-Mei Wang, Shuang-Qing Peng
The adverse effects of PM2.5 are the results of combined toxicities of finer particles and their adsorbed toxic pollutants. Nevertheless, the combined toxicity of finer particles and air pollutants still remains unclear. The present study was therefore undertaken to investigate the combined cytotoxicity of silica nanoparticles (nano-SiO2, a typical atmospheric ultrafine particle) and lead acetate (Pb, a representative air pollutant) in A549 cells focusing on mitochondria-dependent apoptosis induction. The results showed that Pb exposure alone induced mitochondria-dependent apoptosis in A549 cells, as evidenced by increased apoptotic rate and Bax/Bcl-2 ratio, up-regulated caspases 3 and 9 expressions as well as decreased mitochondrial membrane potential...
April 3, 2017: Environmental Toxicology and Pharmacology
https://www.readbyqxmd.com/read/28410499/comparing-the-impact-of-ultrafine-particles-from-petrodiesel-and-biodiesel-combustion-to-bacterial-metabolism-by-targeted-hplc-ms-ms-metabolic-profiling
#5
Fanyi Zhong, Mengyang Xu, Katie Schelli, Joshua Rutowski, Britt A Holmén, Jiangjiang Zhu
Alterations of gut bacterial metabolism play an important role in their host metabolism, and can result in diseases such as obesity and diabetes. While many factors were discovered influencing the gut bacterial metabolism, exposure to ultrafine particles (UFPs) from engine combustions were recently proposed to be a potential risk factor for the perturbation of gut bacterial metabolism, and consequentially to obesity and diabetes development. This study focused on evaluation of how UFPs from diesel engine combustions impact gut bacterial metabolism...
April 11, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28404541/making-air-pollution-visible-a-tool-for-promoting-environmental-health-literacy
#6
Ekaterina Galkina Cleary, Allison P Patton, Hsin-Ching Wu, Alan Xie, Joseph Stubblefield, William Mass, Georges Grinstein, Susan Koch-Weser, Doug Brugge, Carolyn Wong
BACKGROUND: Digital maps are instrumental in conveying information about environmental hazards geographically. For laypersons, computer-based maps can serve as tools to promote environmental health literacy about invisible traffic-related air pollution and ultrafine particles. Concentrations of these pollutants are higher near major roadways and increasingly linked to adverse health effects. Interactive computer maps provide visualizations that can allow users to build mental models of the spatial distribution of ultrafine particles in a community and learn about the risk of exposure in a geographic context...
April 12, 2017: JMIR Public Health and Surveillance
https://www.readbyqxmd.com/read/28395241/spatial-variations-in-ambient-ultrafine-particle-concentrations-and-the-risk-of-incident-prostate-cancer-a-case-control-study
#7
Scott Weichenthal, Eric Lavigne, Marie-France Valois, Marianne Hatzopoulou, Keith Van Ryswyk, Maryam Shekarrizfard, Paul J Villeneuve, Mark S Goldberg, Marie-Elise Parent
BACKGROUND: Diesel exhaust contains large numbers of ultrafine particles (UFPs, <0.1µm) and is a recognized human carcinogen. However, epidemiological studies have yet to evaluate the relationship between UFPs and cancer incidence. METHODS: We conducted a case-control study of UFPs and incident prostate cancer in Montreal, Canada. Cases were identified from all main Francophone hospitals in the Montreal area between 2005 and 2009. Population controls were identified from provincial electoral lists of French Montreal residents and frequency-matched to cases using 5-year age groups...
April 7, 2017: Environmental Research
https://www.readbyqxmd.com/read/28391931/characterization-of-particulate-matter-from-diesel-passenger-cars-tested-on-chassis-dynamometers
#8
Sungwoon Jung, Jaehyun Lim, Sangil Kwon, Sangwoo Jeon, Jeongsoo Kim, Jongtae Lee, Sunmoon Kim
Emission characterization of particle number as well as particle mass from three diesel passenger cars equipped with diesel particulate filter (DPF), diesel oxidation catalyst (DOC) and exhaust gas recirculation (EGR) under the vehicle driving cycles and regulatory cycle. Total particle number emissions (PNEs) decreased gradually during speed-up of vehicle from 17.3 to 97.3km/hr. As the average vehicle speed increases, the size-segregated peak of particle number concentration shifts to smaller size ranges of particles...
April 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28390701/ultrafine-particle-air-pollution-inside-diesel-propelled-passenger-trains
#9
Victoria Abramesko, Leonid Tartakovsky
Locomotives with diesel engines are used worldwide and are an important source of air pollution. Pollutant emissions by locomotive engines affect the air quality inside passenger trains. This study is aimed at investigating ultrafine particle (UFP) air pollution inside passenger trains and providing a basis for assessing passenger exposure to this pollutant. The concentrations of UFPs inside the carriages of push-pull trains are dramatically higher when the train operates in pull mode. This clearly shows that locomotive engine emissions are a dominant factor in train passengers' exposure to UFPs...
April 5, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28376835/indoor-air-pollution-and-its-association-with-poor-lung-function-microalbuminuria-and-variations-in-blood-pressure-among-kitchen-workers-in-india-a-cross-sectional-study
#10
Amarnath Singh, Chandrasekharan Nair Kesavachandran, Ritul Kamal, Vipin Bihari, Afzal Ansari, Parappurath Abdul Azeez, Prem Narain Saxena, Anil Kumar Ks, Altaf Hussain Khan
BACKGROUND: The present study is an attempt to explore the association between kitchen indoor air pollutants and physiological profiles in kitchen workers with microalbuminuria (MAU) in north India (Lucknow) and south India (Coimbatore). METHODS: The subjects comprised 145 control subjects, 233 kitchen workers from north India and 186 kitchen workers from south India. Information related to the personal and occupational history and health of the subjects at both locations were collected using a custom-made questionnaire...
April 4, 2017: Environmental Health: a Global Access Science Source
https://www.readbyqxmd.com/read/28372757/an-optimized-two-step-derivatization-method-for-analyzing-diethylene-glycol-ozonation-products-using-gas-chromatography-and-mass-spectrometry
#11
Ran Yu, Lei Duan, Jingkun Jiang, Jiming Hao
The ozonation of hydroxyl compounds (e.g., sugars and alcohols) gives a broad range of products such as alcohols, aldehydes, ketones, and carboxylic acids. This study developed and optimized a two-step derivatization procedure for analyzing polar products of aldehydes and carboxylic acids from the ozonation of diethylene glycol (DEG) in a non-aqueous environment using gas chromatography-mass spectrometry. Experiments based on Central Composite Design with response surface methodology were carried out to evaluate the effects of derivatization variables and their interactions on the analysis...
March 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28356116/occupational-exposures-and-determinants-of-ultrafine-particle-concentrations-during-laser-hair-removal-procedures
#12
Emily J Eshleman, Mallory LeBlanc, Lisa B Rokoff, Yinyin Xu, Rui Hu, Kachiu Lee, Gary S Chuang, Gary Adamkiewicz, Jaime E Hart
BACKGROUND: Occupational exposures to ultrafine particles in the plume generated during laser hair removal procedures, the most commonly performed light based cosmetic procedure, have not been thoroughly characterized. Acute and chronic exposures to ambient ultrafine particles have been associated with a number of negative respiratory and cardiovascular health effects. Thus, the aim of this study was to measure airborne concentrations of particles in a diameter size range of 10 nm to 1 μm in procedure rooms during laser hair removal procedures...
March 29, 2017: Environmental Health: a Global Access Science Source
https://www.readbyqxmd.com/read/28340080/measuring-pm2-5-ultrafine-particles-air-nicotine-and-wipe-samples-following-the-use-of-electronic-cigarettes
#13
Paul Melstrom, Bartosz Koszowski, Meridith Hill Thanner, Eunha Hoh, Brian King, Rebecca Bunnell, Tim McAfee
Background: Few studies have examined the extent of inhalation or dermal contact among bystanders following short-term, secondhand e-cigarette exposure. Objective: Measure PM2.5 (particles <2.5 microns), UF (ultrafine particles <100nm), and nicotine in air and deposited on surfaces and clothing pre-/during/post- a short-term (two-hour) e-cigarette exposure. Methods: E-cigarettes were used ad libitum by three experienced users for two hours during two separate sessions (disposable e-cigarettes, then tank-style e-cigarettes, or "tanks") in a 1858ft3 room...
March 9, 2017: Nicotine & Tobacco Research: Official Journal of the Society for Research on Nicotine and Tobacco
https://www.readbyqxmd.com/read/28321937/ultrafine-particles-and-black-carbon-personal-exposures-in-asthmatic-and-non-asthmatic-children-at-school-age
#14
Pau Pañella, Maribel Casas, David Donaire-Gonzalez, Raquel Garcia-Esteban, Oliver Robinson, Antònia Valentín, John Gulliver, Isabelle Momas, Mark Nieuwenhuijsen, Martine Vrijheid, Jordi Sunyer
Traffic-related air pollution (TRAP) exposure during childhood is associated with asthma; however, the contribution of the different TRAP pollutants in each microenvironment (home, school, transportation, others) in asthmatic and non-asthmatic children is unknown. Daily (24 h) personal black carbon (BC), ultrafine particles (UFP), and alveolar lung deposited surface area (LDSA) individual exposure measurements were obtained from 100 children (29 past and 21 current asthmatics, 50 non-asthmatics) aged 9±0.7 years from the INMA-Sabadell cohort (Catalonia, Spain)...
March 20, 2017: Indoor Air
https://www.readbyqxmd.com/read/28283350/ultrafine-carbon-particles-promote-rotenone-induced-dopamine-neuronal-loss-through-activating-microglial-nadph-oxidase
#15
Yinxi Wang, Dan Liu, Huifeng Zhang, Yixin Wang, Ling Wei, Yutong Liu, Jieying Liao, Hui-Ming Gao, Hui Zhou
BACKGROUND: Atmospheric ultrafine particles (UFPs) and pesticide rotenone were considered as potential environmental risk factors for Parkinson's disease (PD). However, whether and how UFPs alone and in combination with rotenone affect the pathogenesis of PD remains largely unknown. METHODS: Ultrafine carbon black (ufCB, a surrogate of UFPs) and rotenone were used individually or in combination to determine their roles in chronic dopaminergic (DA) loss in neuron-glia, and neuron-enriched, mix-glia cultures...
May 1, 2017: Toxicology and Applied Pharmacology
https://www.readbyqxmd.com/read/28282961/pedestrians-in-traffic-environments-ultrafine-particle-respiratory-doses
#16
Maurizio Manigrasso, Claudio Natale, Matteo Vitali, Carmela Protano, Pasquale Avino
Particulate matter has recently received more attention than other pollutants. PM10 and PM2.5 have been primarily monitored, whereas scientists are focusing their studies on finer granulometric sizes due both to their high number concentration and their high penetration efficiency into the respiratory system. The purpose of this study is to investigate the population exposure to UltraFine Particles (UFP, submicrons in general) in outdoor environments. The particle number doses deposited into the respiratory system have been compared between healthy individuals and persons affected by Chronic Obstructive Pulmonary Disease (COPD)...
March 9, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28279581/exposure-of-in-pram-babies-to-airborne-particles-during-morning-drop-in-and-afternoon-pick-up-of-school-children
#17
Prashant Kumar, Ioar Rivas, Lovish Sachdeva
In-pram babies are more susceptible to air pollution effects, yet studies assessing their exposure are limited. We measured size-resolved particle mass (PMC; 0.25-32 μm) and number (PNC; 0.2-1 μm) concentrations on a 2.7 km route. The instruments were placed inside a baby pram. The route passed through 4 traffic intersections (TIs) and a bus stand. A total of ∼87 km road length was covered through 64 trips, made during school drop-in (morning) and pick-up (afternoon) hours. The objectives were to assess PMC and PNC exposure to in-pram babies at different route segments, understand their physicochemical characteristics and exposure differences between in-pram babies and adults carrying them...
March 6, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28278377/surfactant-modified-ultrafine-gold-nanoparticles-with-magnetic-responsiveness-for-reversible-convergence-and-release-of-biomacromolecules
#18
Lu Xu, Shuli Dong, Jingcheng Hao, Jiwei Cui, Heinz Hoffmann
It is difficult to synthesize magnetic gold nanoparticles (AuNPs) with ultrafine sizes (<2 nm) based on a conventional method via coating AuNPs using magnetic particles, compounds, or ions. Here, magnetic cationic surfactants C16H33N(+)(CH3)3[CeCl3Br](-) (CTACe) and C16H33N(+)(CH3)3[GdCl3Br](-) (CTAGd) are prepared by a one-step coordination reaction, i.e., C16H33N(+)(CH3)3Br(-) (CTABr) + CeCl3 or GdCl3 → CTACe or CTAGd. A simple strategy for fabricate ultrafine (<2 nm) magnetic gold nanoparticles (AuNPs) via surface modification with weak oxidizing paramagnetic cationic surfactants, CTACe or CTAGd, is developed...
March 17, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28278066/characterization-of-exposure-to-byproducts-from-firing-lead-free-frangible-ammunition-in-an-enclosed-ventilated-firing-range
#19
Christin M Grabinski, Mark M Methner, Jerimiah M Jackson, Alexander L Moore, Laura E Flory, Trevor Tilly, Saber M Hussain, Darrin K Ott
U.S. Air Force small arms firing ranges began using copper-based, lead-free frangible ammunition in the early 2000s due to environmental and health concerns related to the use of lead-based ammunition. Exposure assessments at these firing ranges have routinely detected chemicals and metals in amounts much lower than their mass-based occupational exposure limits, yet, instructors report work-related health concerns including respiratory distress, nausea, and headache. The objective of this study at one firing range was to characterize the aerosol emissions produced by weapons during firing events and evaluate the ventilation system's effectiveness in controlling instructor exposure to these emissions...
February 26, 2017: Journal of Occupational and Environmental Hygiene
https://www.readbyqxmd.com/read/28276550/particle-size-specific-distribution-of-perfluoro-alkyl-substances-in-atmospheric-particulate-matter-in-asian-cities
#20
H Ge, E Yamazaki, N Yamashita, S Taniyasu, A Ogata, M Furuuchi
Seasonal and local characteristics of perfluorinated alkylated substances (PFASs) were examined using size-segregated particles including an ultrafine range. The examination included sampling and analysis of ambient particles collected at four sites located in different environments in three different countries, Japan (Kanazawa and Okinawa), Hong Kong and India. To minimize the evaporation artefacts derived from PFASs during the sampling, an air sampler that permitted particles smaller than 0.1 μm (PM0.1) to be separated at a moderate pressure drop (<5-15 kPa), was used for all of the air sampling procedures...
April 19, 2017: Environmental Science. Processes & Impacts
keyword
keyword
56335
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"