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تعداد نتایج: 1305325 فیلتر نتایج به سال:
Samples of PM10 and PM2.5 were collected discontinuously between 2003 and 2010 at fifteen monitoring sites (urban, background, industrial) in the south-eastern part of Italy using a mobile laboratory. In total, 483 PM10 and 154 PM2.5 samples were collected and chemically analyzed for the determination of metal content. Data were used to investigate concentration differences among the typologies...
The CO dehydrogenase of the eubacterium Oligotropha carboxidovorans is a 277-kDa Mo- and Cu-containing iron-sulfur flavoprotein. Here, the enzyme's active site in the oxidized or reduced state, after inactivation with potassium cyanide or with n-butylisocyanide bound to the active site, has been reinvestigated by multiple wavelength anomalous dispersion measurements at atomic resolution, electr...
Apparently, breathing clean air is of significant importance to human beings and thus attention to what enters our body through inhalation is on the increase. Tehran’s air pollution has received considerable media coverage in recent years: Since particulate matter (TSP and PM10) is one of the important pollutants in this city, an attempt was made to study TSP and PM10 concentrations and to make...
Our paper presents the motives for conducting the equivalence tests and the reasons of discrepancies between the results of PM10 dust concentration obtained via the reference method and the methods based on ‘on-site’ measurement. The reference and non-reference methods of measurement of PM10 dust concentration in air have been discussed. Field tests for equivalence, following the Polish standar...
Twenty-four-hour samples of PM10 (mass of particles with aerodynamic diameter < or = 10 microm), PM2.5, (mass of particles with aerodynamic diameter < or = 2.5 microm), particle strong acidity (H+), sulfate (SO42-), nitrate (NO3-), ammonia (NH3), nitrous acid (HONO), and sulfur dioxide were collected inside and outside of 281 homes during winter and summer periods. Measurements were also conduc...
BACKGROUND Prenatal and early life periods represent critical windows for oxidant pollutant-induced lung remodeling. The objective of this study was to examine the association of prenatal and lifetime exposures to air pollutants with pulmonary function in a cohort of children with asthma. METHODS Prenatal and lifetime exposure to several air pollutants was reconstructed for 232 children with ...
زمینه و هدف: ارتباط آلودگی هوا و بیماری های مرتبط با آن در مطالعات متعددی گزارش شده است. با توجه به محدود بودن چنین مطالعاتی در نقاط شهری دارای آلودگی هوا در کشور، این مطالعه با هدف تعیین ارتباط بین آلایندههای هوا و پذیرش بیمارستانی با علایم تنفسی در شهر تبریز انجام شده است. روش کار: این مطالعه با استفاده از روش مورد- متقاطع و مدل شبکه عصبی انجام شده است. داده های پذیرش بیمارستانی بر اساس کد...
Background and purpose: Particulate matter is one of the main pollutants in underground transport systems. Increase in its concentration leads to health problems in passengers and metro staff. Current research aimed at studying the concentration of particulate matter with aerodynamic diameter less than 10 micron (PM10) in Tehran underground transport system. Materials and methods: In thi...
Chemical Characterization of Particulate Matter at Traffic Prone Roadside Environment in Agra, India
In the present study, size-segregated samples of PM were collected from urban and semi-urban traffic junctions in Agra, India. PM samples were collected during the monsoon season (July to September 2015) using Grimm portable aerosol Spectrometer. The recorded mean concentration of PM10 at urban site was 137.09±61μg/m3 and at semi-urban site was 270.14±21μg/m3, which were higher than the suggest...
BACKGROUND The chemical composition of aerosols and particle size distributions are the most significant factors affecting air quality. In particular, the exposure to finer particles can cause short and long-term effects on human health. In the present paper PM10 (particulate matter with aerodynamic diameter lower than 10 μm), CO, NOx (NO and NO2), Benzene and Toluene trends monitored in six mo...
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