Xem 1-20 trên 56 kết quả Nitrogen oxides
  • Tham khảo sách 'selective catalytic reduction technology for the control of nitrogen oxide', kỹ thuật - công nghệ, kĩ thuật viễn thông phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Analysing the causes of chronic cough: relation to diesel exhaust, ozone, nitrogen oxides, sulphur oxides and other environmental factors

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  • Nitric oxide (NO) is a potent intra- and intercellular mes-senger involved in the control of vascular tone, neuronal signallingandhost response to infection. Inmammals,NOis synthesized by oxidation ofL-arginine catalysed by heme-proteins called NO-synthases with intermediate formation of N x -hydroxy-L-arginine (NOHA). NOHA and some hydroxyguanidines have been shown to be able to deliver nitrogen oxides including NO in the presence of various oxidative systems.

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  • Các oxit nitơ là một trong các loại dai dẳng nhất của chất gây ô nhiễm không khí phát ra trên toàn cầu bởi vì họ là những sản phẩm cháy của cả hai nguồn văn phòng phẩm và điện thoại di động. Bởi đến nay nồng độ cao nhất của các oxit được hình thành trong quá trình đốt cháy là NO và NO2. Với thời gian, và trong sự hiện diện của O2 hoặc trong khí thải trong bầu khí quyển của NO được chuyển thành NO2. Có sáu oxit thường gặp của nitơ: (1) nitric oxide (NO),...

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  • Polyamine oxidases are FAD-dependent enzymes catalyzing the oxidation of polyamines at the secondary amino groups.Zea maysPAO (ZmPAO) oxidizes the carbon on the endo-side of the N5-nitrogen of spermidine (Spd) and spermine (Spm).

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  • Salvinorin A is a potent kappa opioid receptor (KOP) agonist with unique structural and pharmacological properties. This non-nitrogenous ligand lacks nearly all the structural features commonly associated with opioid ligand binding and selectivity. This study explores the structural basis to salvinorin A binding and selectivity using a combination of chimeric and single-point mutant opioid receptors.

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  • This epigraph is very correct for the Russian Federation today because the average lifespan of Russian men in this country is 57 years (Russian women are living on ten years more). It is statistical data. Russian scientists are an exception. Particularly, the majority of contributors of this volume are older then 60 and the editor of volume is older then 75.

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  • ....CRC Press Taylor & Francis Group 6000 Broken Sound Parkway NW, Suite 300 Boca Raton, FL 33487-2742 © 2010 by Taylor and Francis Group, LLC CRC Press is an imprint of Taylor & Francis Group, an Informa business No claim to original U.S. Government works Printed in the United States of America on acid-free paper 10 9 8 7 6 5 4 3 2 1 International Standard Book Number: 978-1-4200-5398-2 (Hardback) This book contains information obtained from authentic and highly regarded sources.

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  • Ô nhiễm không khí được định nghĩa là sự hiện diện trong không khí ngoài trời của một hoặc nhiều chất gây ô nhiễm (chất gây ô nhiễm) số lượng và thời gian có thể làm tổn thương con người, cây trồng, hoặc động vật sống hoặc tài sản (nguyên liệu) hoặc bất hợp lý cản trở hưởng cuộc sống hoặc thực hiện của doanh nghiệp.

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  • Anthropogenic air pollution constitutes of many substances. Greenhouse gases absorb and reflect some of the infrared parts of solar radiation reflected from the earth surface thus causing the troposphere to be warmer. Among others, these substances are carbone-dioxide, water vapour, hydrogen oxides, nitrogen-oxides and methane. Beyond causing warming, most of these gases are poisonous to the Earth’s biosphere. Besides greenhouse gases, there are a few more poisonous substances which have anthropogenic sources.

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  • Methanol: Short-term inhalation of methanol is linked to motor dysfunctions and visual disturbances such as blurred vision leading to blindness. Long-term exposure can result in headaches, insomnia and visual disturbances. There is no evidence linking exposure to methanol and cancer. Toluene, xylenes, MEK, MIBK and methanol also are classified as VOCs. Once released to the atmosphere, VOCs react with nitrogen oxides and sunlight to form ground-level ozone.

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  • Secondary aerosol is produced by the oxidation of primary gases (sulphur dioxide, SO2, nitrogen oxides, NOx, and volatile organic compounds, VOCs,) to sulphuric and nitric acid, and organic vapours, followed by their gas-particle conversion [26, 77]. Finally, some of these acidic gases can be neutralised by reaction with ammonia gas or calcium carbonate (calcite) forming secondary aerosol (ammonium sulphate, ammonium nitrate, calcium sulphate, calcium nitrate).

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  • The cellular damage due to the hypoxi/re-oxigenative stress may trigger the production of free radicals with consequent destabilization of the cell membranes (Calandrella et al., 2010). As a matter of fact literature data show that the ischemic insult at retinal level activates iNOS which leads to the production of nitrogen oxide (Goldstein et al., 1995; Geyer et al., 1995): this compound is cytotoxic at high concentration and causes lipid peroxidation (Crow et al., 1996; Ullrich et al., 2000).

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  • Airborne suspended particulate matter (PM) can be either primary or secondary in nature. Primary particles are emitted directly into the atmosphere either by natural or anthropogenic processes, whereas secondary particles have a predominantly man made origin and are formed in the atmosphere from the oxidation and subsequent reactions of sulphur dioxide, nitrogen oxides and VOCs.

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  • The Central Pollution Control Board (CPCB) provided daily data on air pollution levels collected at the nine monitoring stations located throughout the city. Six of these monitors have been in operation since 1987 and are operated directly by the CPCB. The other three monitors, added to the monitoring network in 1990, are operated on behalf of the CPCB by the National Environmental Engineering Research Institute (NEERI).

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  • The major sources of carbon monoxide pollution are automotive exhaust and emissions from large industrial combustion sources such as electrical power plants. Because these sources produce many contaminants in addition to carbon monoxide -- such as fine particles and nitrogen oxides -- it is often difficult to isolate the health effects of ambient carbon monoxide from those of other pollutants. In addition to carbon monoxide generated outside, there are also important indoor sources of the pollutant.

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  • Applying much more phosphorus fertilizer and manure than crops can use builds up phosphorus in soil. After continuous over-fertilization, agricultural fields become a persistent reservoir for phosphorus that ends up polluting water bodies. Recent USGS study found that in the agricultural Midwest, many streams have their highest nitrogen concentrations in the spring, peaking in April-May.

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  • Switzerland's policy for improving air quality "must be pursued with determination," the agency added. "In particular, this means using more advanced technologies and introducing stricter norms for nitrogen oxide (NOx) and particulates." The agency said one reason for the smaller than anticipated decrease in polluting emissions is the projected increase in truck traffic despite the Swiss government's efforts to encourage trucks crossing through Switzerland to be put on rail cars through the use of road tolls and quotas on truck traffic.

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  • In the last 10-20 years epidemiology has dealt extensively with the effect of outdoor air pollution on human health. A considerable number of case studies in different countries and under different exposure situations have confirmed that air pollution is one of various risk-factors for morbidity and mortality. In general, air pollution is a mixture of many substances (particulates, nitrogen oxides, sulfur dioxides). Knowing that several indicators of exposure (eg. NO2, CO, PM10, TSP etc.

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  • In Austria, particulate matter is measured in agreement with national legislation as Total Suspended Particulate (TSP) at more than 110 sites, whereas PM10 measurements are not yet available. It was assumed that ambient air TSP levels can be attributed to the contribution of local sources and regional background concentrations. Both of them were modelled separately. The starting point for the modelling of local contributions was the availability of a spatially disaggregated emission inventory for nitrogen oxides (NOx).

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