keyword
MENU ▼
Read by QxMD icon Read
search

PM1

keyword
https://www.readbyqxmd.com/read/28549323/investigation-of-submicron-aerosol-characteristics-in-changzhou-china-composition-source-and-comparison-with-co-collected-pm2-5
#1
Zhaolian Ye, Qing Li, Jiashu Liu, Shipeng Luo, Quanfa Zhou, Chenglu Bi, Shuaishuai Ma, Yanfang Chen, Hui Chen, Ling Li, Xinlei Ge
Mass concentrations and chemical compositions of submicron particles (PM1) collected during July 2015 to April 2016 in Changzhou, a city in the Yangtze River Delta region, were systematically investigated for the first time. Specifically, an Aerodyne soot particle aerosol mass spectrometer (SP-AMS) was employed to characterize the water-soluble organic matter (WSOM). The average concentration of PM1 was 63.6 μg m(-3), occupying ∼60% of co-collected PM2.5 mass. Water soluble inorganic ions (WSIIs) was the most abundant component with secondary ions (SO4(2-), NO3(-) and NH4(+)) as the dominant species...
May 17, 2017: Chemosphere
https://www.readbyqxmd.com/read/28508335/toxic-potential-of-organic-constituents-of-submicron-particulate-matter-pm1-in-an-urban-road-site-barcelona
#2
Sofia R Mesquita, Barend L van Drooge, Manuel Dall'Osto, Joan O Grimalt, Carlos Barata, Natividade Vieira, Laura Guimarães, Benjamin Piña
Atmospheric particulate matter (PM) is a recognized risk factor contributing to a number of diseases in human populations and wildlife globally. Organic matter is a major component of PM, but its contribution to overall toxicity of PM has not been thoroughly evaluated yet. In the present work, the biological activity of organic extracts from PM1 (particles with less than 1 μm of aerodynamic diameter) collected from an urban road site in the centre of Barcelona (NE Spain) was evaluated using a yeast-based assay (AhR-RYA) and different gene expression markers in zebrafish embryos...
May 16, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28498939/carbon-utilization-profiles-of-river-bacterial-strains-facing-sole-carbon-sources-suggest-metabolic-interactions
#3
Lise Goetghebuer, Pierre Servais, Isabelle George
Microbial communities play a key role in water self-purification. They are primary drivers of biogenic element cycles and ecosystem processes. However, these communities remain largely uncharacterized. In order to understand the diversity-heterotrophic activity relationship facing sole carbon sources, we assembled a synthetic community composed of 20 'typical' freshwater bacterial species mainly isolated from the Zenne River (Belgium). The carbon source utilization profiles of each individual strain and of the mixed community were measured in Biolog Phenotype MicroArrays PM1 and PM2A microplates that allowed testing 190 different carbon sources...
May 11, 2017: FEMS Microbiology Letters
https://www.readbyqxmd.com/read/28487938/age-associated-alterations-in-constitutively-expressed-cyclooxygenase-2-immunoreactivity-and-protein-levels-in-the-hippocampus
#4
Hyo Young Jung, Dae Young Yoo, Jong Whi Kim, Hyun Jung Kwon, Kwon Young Lee, Jung Hoon Choi, Dae Won Kim, Jin Young Chung, Yeo Sung Yoon, In Koo Hwang
Cyclooxygenase-2 (COX-2) is a known inducible inflammatory mediator. COX-2 is constitutively expressed in the hippocampus and may regulate synaptic plasticity. The present study investigated the age‑associated alterations in white blood cell counts and hippocampal COX‑2 expression in healthy mice using immunohistochemical and western blot analyses at 1 month postnatal (PM1), PM3, PM6, PM12 and PM24. White blood cell counts were significantly decreased in the PM24 group when compared with the PM1 group...
June 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28482256/characterization-of-pahs-in-size-fractionated-submicron-atmospheric-particles-and-their-association-with-the-intracellular-oxidative-stress
#5
Qinghua Zhou, Baichen Liu, Yimei Chen, Xiaoqian Han, Xiuzhen Wei, Ying Zhu, Xing Zhou, Jinyuan Chen
The submicron atmospheric particulate matters (PMs), consisting of 7 size-resolved fractions, were collected by two Dekati low pressure impactors from December 2015 to January 2016 in Hangzhou, China. The chemical analysis revealed the higher accumulation efficiency of polycyclic aromatic hydrocarbons (PAHs) in the finer submicron PMs, and 77.0% of particulate PAHs in PM1 were associated with PM0.4. Moreover, the BaP equivalent concentrations (BaPeq) were evaluated for size-fractionated submicron PMs, indicating that 77...
April 29, 2017: Chemosphere
https://www.readbyqxmd.com/read/28468246/the-relationship-of-pm-variation-with-visibility-and-mixing-layer-height-under-hazy-foggy-conditions-in-the-multi-cities-of-northeast-china
#6
Hujia Zhao, Huizheng Che, Yanjun Ma, Yangfeng Wang, Hongbin Yang, Yuche Liu, Yaqiang Wang, Hong Wang, Xiaoye Zhang
The variations of visibility, PM-mass concentration and mixing-layer height (MLH) in four major urban/industry regions (Shenyang, Anshan, Benxi and Fushun) of central Liaoning in Northeast China are evaluated from 2009 to 2012 to characterize their dynamic effect on air pollution. The annual mean visibilities are about 13.7 ± 7.8, 13.5 ± 6.5, 12.8 ± 6.1 and 11.5 ± 6.8 km in Shenyang, Anshan, Benxi and Fushun, respectively. The pollution load (PM × MLH) shows a weaker vertical diffusion in Anshan, with a higher PM concentration near the surface...
April 29, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28468124/temporal-evolution-of-ultrafine-particles-and-of-alveolar-deposited-surface-area-from-main-indoor-combustion-and-non-combustion-sources-in-a-model-room
#7
Maurizio Manigrasso, Matteo Vitali, Carmela Protano, Pasquale Avino
Aerosol number size distributions, PM mass concentrations, alveolar deposited surface areas (ADSAs) and VOC concentrations were measured in a model room when aerosol was emitted by sources frequently encountered in indoor environments. Both combustion and non-combustion sources were considered. The most intense aerosol emission occurred when combustion sources were active (as high as 4.1×10(7)particlescm(-3) for two meat grilling sessions; the first with exhaust ventilation, the second without). An intense spike generation of nucleation particles occurred when appliances equipped with brush electric motors were operating (as high as 10(6)particlescm(-3) on switching on an electric drill)...
April 29, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28463703/investigation-of-hygroscopic-growth-effect-on-aerosol-scattering-coefficient-at-a-rural-site-in-the-southern-north-china-plain
#8
Yunfei Wu, Xiaojia Wang, Peng Yan, Leiming Zhang, Jun Tao, Xinyu Liu, Ping Tian, Zhiwei Han, Renjian Zhang
Aerosol optical properties and the effect of hygroscopic growth on the scattering coefficients at a rural site in the southern North China Plain were investigated based on a two-month observation conducted in the summer of 2014. The scattering coefficient of dry aerosols was high, with a mean (±standard deviation) of 338.8±209.9Mm(-1) (520nm) during the observation period. A noticeable enhancement in aerosol scattering due to hygroscopic growth was observed, e.g., by a factor of 2.28±0.69 at RH of 80% (referred to as f(RH=80%)) and 3...
April 29, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28451957/assessment-of-indoor-and-outdoor-particulate-air-pollution-at-an-urban-background-site-in-iran
#9
Mahmoud Mohammadyan, Mahboobeh Ghoochani, Itai Kloog, Sabah Ahmed Abdul-Wahab, Kaan Yetilmezsoy, Behzad Heibati, Krystal J Godri Pollitt
The relationship between indoor and outdoor particulate air pollution was investigated at an urban background site on the Payambar Azam Campus of Mazandaran University of Medical Sciences in Sari, Northern Iran. The concentration of particulate matter sized with a diameter less than 1 μm (PM1.0), 2.5 μm (PM2.5), and 10 μm (PM10) was evaluated at 5 outdoor and 12 indoor locations. Indoor sites included classrooms, corridors, and office sites in four university buildings. Outdoor PM concentrations were characterized at five locations around the university campus...
May 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28422480/chemical-characterization-of-gas-and-particle-phase-products-from-the-ozonolysis-of-%C3%AE-pinene-in-the-presence-of-dimethylamine
#10
Geoffroy Duporté, Matthieu Riva, Jevgeni Parshintsev, Enna Heikkinen, Luís M F Barreira, Nanna Myllys, Liine Heikkinen, Kari Hartonen, Markku Kulmala, Mikael Ehn, Marja-Liisa Riekkola
Amines are recognized as key compounds in new particle formation (NPF) and secondary organic aerosol (SOA) formation. In addition, ozonolysis of α-pinene contributes substantially to the formation of biogenic SOAs in the atmosphere. In the present study, ozonolysis of α-pinene in the presence of dimethylamine (DMA) was investigated in a flow tube reactor. Effects of amines on SOA formation and chemical composition were examined. Enhancement of NPF and SOA formation was observed in the presence of DMA. Chemical characterization of gas- and particle-phase products by high-resolution mass spectrometric techniques revealed the formation of nitrogen containing compounds...
May 4, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28391951/source-apportionment-of-pahs-and-n-alkanes-bound-to-pm1-collected-near-the-venice-highway
#11
Gabrio Valotto, Giancarlo Rampazzo, Francesco Gonella, Gianni Formenton, Silvia Ficotto, Giorgia Giraldo
n-Alkanes and polycyclic aromatic hydrocarbons (PAHs) bound to atmospheric particulate matter (PM1) were investigated in a traffic site located in an urban area of Venice Province (Eastern Po Valley, Italy) during the cold season. Considering the critical situation affecting the Veneto Region concerning the atmospheric pollution and the general lack of information on PM1 composition and emission in this area, this experimental study aims at determining the source profile, their relative contributions and the dispersion of finer particles...
April 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28391923/evolutionary-processes-and-sources-of-high-nitrate-haze-episodes-over-beijing-spring
#12
Ting Yang, Yele Sun, Wei Zhang, Zifa Wang, Xingang Liu, Pingqing Fu, Xiquan Wang
Rare and consecutive high-nitrate haze pollution episodes were observed in Beijing in spring 2012. We present detailed characterization of the sources and evolutionary mechanisms of this haze pollution, and focus on an episode that occurred between 15 and 26 April. Submicron aerosol species were found to be substantially elevated during haze episodes, and nitrates showed the largest increase and occupation (average: 32.2%) in non-refractory submicron particles (NR-PM1), which did not occur in other seasons as previously reported...
April 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28389029/characterization-of-short-and-medium-chain-chlorinated-paraffins-in-outdoor-indoor-pm10-pm2-5-pm1-0-in-beijing-china
#13
Huiting Huang, Lirong Gao, Dan Xia, Lin Qiao, Runhua Wang, Guijin Su, Wenbin Liu, Guorui Liu, Minghui Zheng
Persistent organic pollutants (POPs) were listed in the Stockholm Convention, because of their adverse health effects, persistence, bioaccumulation and ubiquitous presence in the environment. Short chain chlorinated paraffins (SCCPs), chlorinated derivatives of n-alkanes, have been listed as candidate POPs under Stockholm Convention. Inhalation uptake was an important exposure pathway for non-occupational adult human and the pollution of particle matter has caused great concern. There are some studies focused on POPs such as polychlorinated biphenyls, polychlorinated dibenzo-p-dioxins and dibenzofurans and polybrominated diphenyl ethers in different size particles...
April 4, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28387856/involvement-of-c-terminal-histidines-in-soybean-pm1-protein-oligomerization-and-cu2-binding
#14
Guobao Liu, Ke Liu, Yang Gao, Yizhi Zheng
Late embryogenesis abundant (LEA) proteins are widely distributed among plant species, where they contribute to abiotic stress tolerance. LEA proteins can be classified into seven groups according to conserved sequence motifs. The PM1 protein from soybean, which belongs to the Pfam LEA_1 group, has been shown previously to be at least partially natively unfolded, to bind metal ions and potentially to stabilize proteins and membranes. Here, we investigated the role of the PM1 C-terminal domain and in particular the multiple histidine residues in this half of the protein...
April 6, 2017: Plant & Cell Physiology
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
#15
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/28303958/sophisticated-clean-air-strategies-required-to-mitigate-against-particulate-organic-pollution
#16
T Grigas, J Ovadnevaite, D Ceburnis, E Moran, F M McGovern, S G Jennings, C O'Dowd
Since the 1980's, measures mitigating the impact of transboundary air pollution have been implemented successfully as evidenced in the 1980-2014 record of atmospheric sulphur pollution over the NE-Atlantic, a key region for monitoring background northern-hemisphere pollution levels. The record reveals a 72-79% reduction in annual-average airborne sulphur pollution (SO4 and SO2, respectively) over the 35-year period. The NE-Atlantic, as observed from the Mace Head research station on the Irish coast, can be considered clean for 64% of the time during which sulphate dominates PM1 levels, contributing 42% of the mass, and for the remainder of the time, under polluted conditions, a carbonaceous (organic matter and Black Carbon) aerosol prevails, contributing 60% to 90% of the PM1 mass and exhibiting a trend whereby its contribution increases with increasing pollution levels...
March 17, 2017: Scientific Reports
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...
May 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28278029/overview-of-surface-measurements-and-spatial-characterization-of-submicron-particulate-matter-during-the-discover-aq-2013-campaign-in-houston
#18
Y J Leong, N P Sanchez, H W Wallace, B Karakurt Cevik, C S Hernandez, Y Han, J H Flynn, P Massoli, C Floerchinger, E C Fortner, S Herndon, J K Bean, L Hildebrandt Ruiz, W Jeon, Y Choi, B Lefer, R J Griffin
The sources of submicron particulate matter (PM1) remain poorly characterized in the industrialized city of Houston. A mobile sampling approach was used to characterize PM1 composition and concentration across Houston based on high time resolution measurements of non-refractory PM1 and trace gases during the DISCOVER-AQ Texas 2013 campaign. Two pollution zones with marked differences in PM1 levels, character, and dynamics were established based on cluster analysis of organic aerosol mass loadings sampled at sixteen sites...
February 28, 2017: Journal of the Air & Waste Management Association
https://www.readbyqxmd.com/read/28268029/exposure-to-polycyclic-aromatic-hydrocarbons-in-atmospheric-pm1-0-of-urban-environments-carcinogenic-and-mutagenic-respiratory-health-risk-by-age-groups
#19
Dayana M Agudelo-Castañeda, Elba C Teixeira, Ismael L Schneider, Sheila Rincón Lara, Luis F O Silva
We investigated the carcinogenic and mutagenic respiratory health risks related to the exposure to atmospheric PAHs in an urban area. Our study focused in the association of these pollutants and their possible effect in human health, principally respiratory and circulatory diseases. Also, we determined a relationship between the inhalation risk of PAHs and meteorological conditions. We validated the hypothesis that in winter PAHs with high molecular weight associated to submicron particles (PM1) may increase exposure risk, especially for respiratory diseases, bronchitis and pneumonia diseases...
March 4, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28254051/chemical-characterization-and-source-apportionment-of-atmospheric-submicron-particles-on-the-western-coast-of-taiwan-strait-china
#20
Liming Cao, Qiao Zhu, Xiaofeng Huang, Junjun Deng, Jinsheng Chen, Youwei Hong, Lingling Xu, Lingyan He
Taiwan Strait is a special channel for subtropical East Asian Monsoon and its western coast is an important economic zone in China. In this study, a suburban site in the city of Xiamen on the western coast of Taiwan Strait was selected for fine aerosol study to improve the understanding of air pollution sources in this region. An Aerodyne high-resolution time-of-flight aerosol mass spectrometer (HR-ToF-AMS) and an Aethalometer were deployed to measure fine aerosol composition with a time resolution of 5 min from May 1 to 18, 2015...
February 2017: Journal of Environmental Sciences (China)
keyword
keyword
56336
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"