keyword
MENU ▼
Read by QxMD icon Read
search

Ozone

keyword
https://www.readbyqxmd.com/read/28930181/ambient-air-pollution-and-risk-for-ischemic-stroke-a-short-term-exposure-assessment-in-south-china
#1
Pi Guo, Yulin Wang, Wenru Feng, Jiagang Wu, Chuanxi Fu, Hai Deng, Jun Huang, Li Wang, Murui Zheng, Huazhang Liu
Data on the association between air pollution and risk of ischemic stroke in China are still limited. This study aimed to investigate the association between short-term exposure to ambient air pollution and risk of ischemic strokes in Guangzhou, the most densely-populated city in south China, using a large-scale multicenter database of stroke hospital admissions. Daily counts of ischemic stroke admissions over the study years 2013-2015 were obtained from the Guangzhou Cardiovascular and Cerebrovascular Disease Event Surveillance System...
September 20, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28926910/removal-of-selected-nitrogenous-heterocyclic-compounds-in-biologically-pretreated-coal-gasification-wastewater-bpcgw-using-the-catalytic-ozonation-process-combined-with-the-two-stage-membrane-bioreactor-mbr
#2
Hao Zhu, Yuxing Han, Wencheng Ma, Hongjun Han, Weiwei Ma
Three identical anoxic-aerobic membrane bioreactors (MBRs) were operated in parallel for 300 consecutive days for raw (R1), ozonated (R2) and catalytic ozonated (R3) biologically pretreated coal gasification wastewater (BPCGW) treatment. The results demonstrated that catalytic ozonation process (COP) applied asa pretreatment remarkably improved the performance of the unsatisfactory single MBR. The overall removal efficiencies of COD, NH3-N and TN in R3 were 92.7%, 95.6% and 80.6%, respectively. In addition, typical nitrogenous heterocyclic compounds (NHCs) of quinoline, pyridine and indole were completely removed in the integrated process...
September 6, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28926363/blood-pressure-measurements-over-thin-and-thick-sleeves-in-the-frail-elderly
#3
Sachiko Ozone, Mikiya Sato, Ayumi Takayashiki, Takuya Sato, Aya Matsushita, Hisashi Yoshimoto, Tetsuhiro Maeno
OBJECTIVE: Blood pressure (BP) measurement is recommended on bare arms, but undressing the arms for BP measurements is often difficult for frail elderly individuals. We aimed to assess the accuracy of BP measurements over arms with thin and thick clothing among the frail elderly. PARTICIPANTS AND METHODS: This is a cross-sectional study. Individuals aged 65 years or older were recruited from three long-term care facilities in Japan between April and May 2016. The main outcome measures were BP measurements (a) on a bare arm, (b) over a thin shirt, (c) over a thin shirt and a cardigan, and (d) over the sleeve of a thin shirt and a cardigan rolled up to the elbow...
September 18, 2017: Blood Pressure Monitoring
https://www.readbyqxmd.com/read/28926258/matrix-isolation-studies-of-novel-intermediates-in-the-reaction-of-trimethylaluminum-with-ozone
#4
H Dushanee M Sriyarathne, Bruce S Ault
The thermal reaction of ozone with trimethyl aluminum has been explored using twin jet, concentric jet and merged jet deposition into cryogenic matrixes. Infrared spectroscopy and density functional theory calculations have been employed to identify and characterize the products formed in each case. Together, these deposition techniques provide information over the essentially full course of the gas phase reaction. At short times with twin jet deposition, the primary product is the O atom insertion product (CH3)2AlOCH3...
September 19, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28925870/pollution-and-sun-exposure-a-deleterious-synergy-mechanisms-and-opportunities-for-skin-protection
#5
Laurent Marrot
Pollutants are highly diverse chemical entities, including gases such as ozone or nitrogen and sulphur oxides and particulate matter of different sizes and with different chemical constituents. PM2.5 is composed of particles that are sometimes about ten nanometres or so in size (ultrafine particles) which can be deposited in lung alveoli, translocated into capillaries and then distributed to all organs through blood circulation. PM2.5 is often associated with toxic chemicals such as heavy metals or polycyclic aromatic hydrocarbons (PAHs) and some photo-reactive PAHs can induce strong oxidative stress under UVA exposure...
September 18, 2017: Current Medicinal Chemistry
https://www.readbyqxmd.com/read/28925753/ozone-partially-decreases-axonal-and-myelin-damage-in-an-experimental-sciatic-nerve-injury-model
#6
Zahir Kızılay, Nesibe Kahraman Çetin, Mehran Aksel, Burçin İrem Abas, Serdar Aktaş, Haydar Ali Erken, Abdullah Topçu, Ali Yılmaz, Cigdem Yenisey
AIM: To investigate the effects of ozone in experimental acute sciatic nerve injury. MATERIAL AND METHODS: Twenty-eight male rats were divided into four groups (n = 7): control (C), ozone (O), injury (SNI), and treatment with ozone after injury (SNI + Ozone). Sciatic nerve injury was generated by compressing the right sciatic nerve for 90 s using a Yasargil aneurysm clip in groups SNI and SNI + Ozone. A 70 µg/ml concentration of ozone was given four times (once a day at 1st, 24th, 48th, and 72th h) at a dose of 0...
September 19, 2017: Journal of Investigative Surgery: the Official Journal of the Academy of Surgical Research
https://www.readbyqxmd.com/read/28923722/high-doses-of-ethylenediurea-edu-as-soil-drenches-did-not-increase-leaf-n-content-or-cause-phytotoxicity-in-willow-grown-in-fertile-soil
#7
Evgenios Agathokleous, Elena Paoletti, William J Manning, Mitsutoshi Kitao, Costas J Saitanis, Takayoshi Koike
Ground-level ozone (O3) levels are nowadays elevated in wide regions of the Earth, causing significant effects on plants that finally lead to suppressed productivity and yield losses. Ethylenediurea (EDU) is a chemical compound which is widely used in research projects as phytoprotectant against O3 injury. The EDU mode of action remains still unclear, while there are indications that EDU may contribute to plants with nitrogen (N) when the soil is poor in N and the plants have relatively small leaf area. To reveal whether the N content of EDU acts as a fertilizer to plants when the soil is not poor in N and the plants have relatively large total plant leaf area, willow plants (Salix sachalinensis Fr...
September 15, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28921105/association-between-air-pollution-exposure-cognitive-and-adaptive-function-and-asd-severity-among-children-with-autism-spectrum-disorder
#8
Tara Kerin, Heather Volk, Weiyan Li, Fred Lurmann, Sandrah Eckel, Rob McConnell, Irva Hertz-Picciotto
Prenatal exposure to air pollution has been associated with autism spectrum disorder (ASD) risk but no study has examined associations with ASD severity or functioning. Cognitive ability, adaptive functioning, and ASD severity were assessed in 327 children with ASD from the Childhood Autism Risks from Genetics and the Environment study using the Mullen Scales of Early Learning (MSEL), the Vineland Adaptive Behavior Scales (VABS), and the Autism Diagnostic Observation Schedule calibrated severity score. Estimates of nitrogen dioxide (NO2), particulate matter (PM2...
September 18, 2017: Journal of Autism and Developmental Disorders
https://www.readbyqxmd.com/read/28918281/distribution-of-vocs-in-urban-and-rural-atmospheres-of-subtropical-india-temporal-variation-source-attribution-ratios-ofp-and-risk-assessment
#9
Amit Kumar, Deepak Singh, Krishan Kumar, Braj Bihari Singh, Vinod Kumar Jain
This paper reports the first study which comprises the seasonal, diurnal variability, source characterization, ozone forming potential and risk assessment of volatile organic compounds (VOCs) at three sites (two urban and one rural) in the National Capital Territory of Delhi, India. The study was performed during three seasons of the year 2013-14 and two different categories of VOCs (aromatics and halogenated) have been selected. The study used the sampling and analytical procedures of NIOSH methods. Results showed that the mean concentration of sum of VOCs (∑VOC) is significantly higher at urban sites (110...
September 14, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28917207/exposure-to-ambient-air-pollution-and-the-incidence-of-dementia-a-population-based-cohort-study
#10
Hong Chen, Jeffrey C Kwong, Ray Copes, Perry Hystad, Aaron van Donkelaar, Karen Tu, Jeffrey R Brook, Mark S Goldberg, Randall V Martin, Brian J Murray, Andrew S Wilton, Alexander Kopp, Richard T Burnett
INTRODUCTION: Emerging studies have implicated air pollution in the neurodegenerative processes. Less is known about the influence of air pollution, especially at the relatively low levels, on developing dementia. We conducted a population-based cohort study in Ontario, Canada, where the concentrations of pollutants are among the lowest in the world, to assess whether air pollution exposure is associated with incident dementia. METHODS: The study population comprised all Ontario residents who, on 1 April 2001, were 55-85years old, Canadian-born, and free of physician-diagnosed dementia (~2...
September 13, 2017: Environment International
https://www.readbyqxmd.com/read/28917171/ambient-air-pollution-and-daily-hospital-admissions-for-mental-disorders-in-shanghai-china
#11
Chen Chen, Cong Liu, Renjie Chen, Weibing Wang, Weihua Li, Haidong Kan, Chaowei Fu
Few studies have investigated the associations between ambient air pollution and mental disorders (MDs), especially in developing countries. We conducted a time-series study to explore the associations between six criteria air pollutants and daily hospital admissions for MDs in Shanghai, China, from 2013 to 2015. The MDs data were derived from the Shanghai Health Insurance System. We used over-dispersed, generalized additive models to estimate the associations after controlling for time trend, weather conditions, day of the week, and holidays...
September 13, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28917169/short-term-associations-of-ambient-air-pollution-and-cause-specific-emergency-department-visits-in-guangzhou-china
#12
Pi Guo, Wenru Feng, Murui Zheng, Jiayun Lv, Li Wang, Ju Liu, Yanhong Zhang, Gangfeng Luo, Yanting Zhang, Changyu Deng, Tongxing Shi, Pengda Liu, Lin Zhang
BACKGROUND: Evidence of association of ambient air pollution with cause-specific emergency department visits in China is still limited. This study aimed to investigate short-term associations between exposures to air pollutants and daily cause-specific emergency department visits using a large-scale multicenter database involving a total of 65 sentinel hospitals in Guangzhou, the most densely-populated city in south China, during 2013-2015. MATERIAL AND METHODS: We obtained data on 162,771 emergency department visits from 65 hospitals from the Emergency Medical Command Center in Guangzhou between January 1, 2013 and December 31, 2015...
September 13, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28915459/relationships-of-co2-assimilation-rates-with-exposure-and-flux-based-o3-metrics-in-three-urban-tree-species
#13
Yansen Xu, Bo Shang, Xiangyang Yuan, Zhaozhong Feng, Vicent Calatayud
The relationships of CO2 assimilation under saturated-light conditions (Asat) with exposure- (AOTX, Accumulated Ozone exposure over a hourly Threshold of X ppb) and flux-based (PODY, Phytotoxic Ozone Dose over a hourly threshold Y nmol·m(-2)·s(-1)) O3 metrics was studied on three common urban trees, Fraxinus chinensis (FC), Platanus orientalis (PO) and Robinia pseudoacacia (RP). Parameterizations for a stomatal multiplicative model were proposed for the three species. RP was the species showing lower species-specific maximum stomatal conductance (gmax) and experiencing lower cumulative O3 uptake along the experiment, but in contrast it was the most sensitive to O3...
September 12, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28914248/comparative-evaluation-of-clinical-and-radiological-success-of-zinc-oxide-ozonated-oil-modified-3mix-mp-antibiotic-paste-and-vitapex-as-treatment-options-in-primary-molars-requiring-pulpectomy-an-in-vivo-study
#14
Divya Doneria, Seema Thakur, Parul Singhal, Deepak Chauhan
OBJECTIVES: The aim of this study was to evaluate the clinical and radiographic success of zinc oxide-ozonated oil (ZnO-OO), modified 3Mix antibiotic paste, and Vitapex in treatment of primary molars requiring pulpectomy. METHODS: Sixty-four primary molars of forty three children aged between 4 and 8 years with pulpally involved primary molars requiring root canal procedures were treated with ZnO-OO, modified 3Mix-MP paste, and Vitapex. The subjects were followed up clinically at 1, 6, and 12 months whereas radiographically at 6 and 12 months, respectively...
October 2017: Journal of the Indian Society of Pedodontics and Preventive Dentistry
https://www.readbyqxmd.com/read/28913722/nonlinear-data-assimilation-for-the-regional-modeling-of-maximum-ozone-values
#15
Marija Zlata Božnar, Boštjan Grašič, Primož Mlakar, Dejan Gradišar, Juš Kocijan
We present a new method of data assimilation with the aim of correcting the forecast of the maximum values of ozone in regional photo-chemical models for areas over complex terrain using multilayer perceptron artificial neural networks. Up until now, these types of models have been used as a single model for one location when forecasting concentrations of air pollutants. We propose a method for constructing a more ambitious model: a single model, which can be used at several locations because the model is spatially transferable and is valid for the whole 2D domain...
September 14, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28911970/mesenchymal-stem-cells-alleviate-oxidative-stress-induced-mitochondrial-dysfunction-in-the-airways
#16
Xiang Li, Charalambos Michaeloudes, Yuelin Zhang, Coen H Wiegman, Ian M Adcock, Qizhou Lian, Judith C W Mak, Pankaj K Bhavsar, Kian Fan Chung
BACKGROUND: Oxidative stress-induced mitochondrial dysfunction may contribute to inflammation and remodeling in chronic obstructive pulmonary disease (COPD). Mesenchymal stem cells (MSCs) protect against lung damage in animal models of COPD. It is unknown whether these effects occur through attenuating mitochondrial dysfunction in airway cells. OBJECTIVE: To examine the effect of induced-pluripotent stem cell-derived MSCs (iPSC-MSCs) on oxidative stress-induce mitochondrial dysfunction in human airway smooth muscle cells (ASMCs) in vitro and in mouse lungs in vivo...
September 11, 2017: Journal of Allergy and Clinical Immunology
https://www.readbyqxmd.com/read/28911664/smog-induces-oxidative-stress-and-microbiota-disruption
#17
REVIEW
Tit-Yee Wong
Smog is created through the interactions between pollutants in the air, fog, and sunlight. Air pollutants, such as carbon monoxide, heavy metals, nitrogen oxides, ozone, sulfur dioxide, volatile organic vapors, and particulate matters, can induce oxidative stress in human directly or indirectly through the formation of reactive oxygen species. The outermost boundary of human skin and mucous layers are covered by a complex network of human-associated microbes. The relation between these microbial communities and their human host are mostly mutualistic...
April 2017: Journal of Food and Drug Analysis
https://www.readbyqxmd.com/read/28910731/triclosan-removal-from-surface-water-by-ozonation-kinetics-and-by-products-formation
#18
Kemal B Orhon, Aybala Koc Orhon, Filiz B Dilek, Ulku Yetis
Removal of triclosan from surface water by ozonation was investigated. The results showed that complete elimination of triclosan from a surface water bearing 1-5 mg/L triclosan via continuous ozonation at 5 mg/L, require an ozonation time of 20-30 min depending on pH. Triclosan oxidation followed pseudo-first order kinetics with an apparent reaction rate constant varying from 0.214 min(-1) to 0.964 min(-1) depending on pH, initial triclosan concentration and water composition. Although the effect of pH was complex due to possible existence of different moieties, higher TCS removal efficiencies were obvious at weak-base conditions...
September 11, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28910071/a-simple-incl3-doped-pedot-pss-and-uv-ozone-treatment-strategy-external-quantum-efficiency-up-to-21-for-solution-processed-organic-light-emitting-devices-with-a-thermally-activated-delayed-fluorescence-emitter
#19
Tao Zhou, Guohua Xie, Shaolong Gong, Manli Huang, Jiajia Luo, Chuluo Yang
A low-cost and easy-processed scheme for solution processed organic light-emitting devices (OLEDs) was provided to overcome the flaws of poly(styrene sulfonic acid)-doped poly(3,4-ethylenedioxythiphene) (PEDOT:PSS) together with the indium tin oxide (ITO) anode. The modified PEDOT:PSS with higher work function (5.66 eV), higher conductivity and more efficient hole injecting ability was obtained by simply mixing the aqueous PEDOT:PSS with InCl3 and then consecutive ultraviolet-ozone treatment. The simply structured and solution-processed OLEDs with our modified PEDOT:PSS achieved very high external quantum efficiency of 21...
September 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28905899/detecting-recovery-of-the-stratospheric-ozone-layer
#20
Martyn P Chipperfield, Slimane Bekki, Sandip Dhomse, Neil R P Harris, Birgit Hassler, Ryan Hossaini, Wolfgang Steinbrecht, Rémi Thiéblemont, Mark Weber
As a result of the 1987 Montreal Protocol and its amendments, the atmospheric loading of anthropogenic ozone-depleting substances is decreasing. Accordingly, the stratospheric ozone layer is expected to recover. However, short data records and atmospheric variability confound the search for early signs of recovery, and climate change is masking ozone recovery from ozone-depleting substances in some regions and will increasingly affect the extent of recovery. Here we discuss the nature and timescales of ozone recovery, and explore the extent to which it can be currently detected in different atmospheric regions...
September 13, 2017: Nature
keyword
keyword
8792
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"