نتایج جستجو برای: environ ment protection
تعداد نتایج: 188336 فیلتر نتایج به سال:
Under section 303(d) of the Clean Water Act, states must identify water segments where loads of. pollutants are violating numeric water quality standards. Consequences of misidentification are quite important. A decision that water quality is impaired initiates the total maximum daily load or TMDL planning requirement. Falsely concludin~ that a water segment is impaired results in unnecessary T...
ment (OECD) and the US Environmental Protection Agency (EPA) have focused on thyroid toxicity and have formulated guidelines for detailed investigations of the process of metamorphosis in African clawed frogs (Xenopus laevis, Fig. 1).1), 2) The thyroid gland, which is in the heads of tadpoles and which is the target of histological examinations in toxicity studies, is on a line between the two ...
B ernd H enkel, Lianshan Zhang, Carsten G oldam m er, Ernst Bayer* Institute of Organic Chemistry, University of Tübingen, Auf der Morgenstelle 18, D-72076 Tübingen, Germany Z. Naturforsch. 51b, 1339-1346 (1996); received April 10, 1996 HIV 1-Protease, Trityl-Linker, Fragment Condensation, Peptide Synthesis, Ionspray-MS, Chiral Gas-chromatography A new trityl-linker for the strategy of combined...
The presented survey investigates risk and exposure perceptions of radio frequency electromagnetic fields (RF EMF) associated with base stations, mobile phones and other sources, the key issue being the interaction between both sets of perceptions. The study is based on a cross-sectional design, and conducted with an online sample of 838 citizens from Portugal. The results indicate that respond...
The increasing worldwide use of paediatric computed tomography (CT) has led to increasing concerns regarding the subsequent effects of exposure to radiation. In response to this concern, the international EPI-CT project was developed to study the risk of cancer in a large multi-country cohort. In radiation epidemiology, accurate estimates of organ-specific doses are essential. In EPI-CT, data c...
Environmental risk assessment of chemical mixtures is challenging because of the multitude of possible combinations that may occur. Aquatic risk from chemical mixtures in an agricultural landscape was evaluated prospectively in 2 exposure scenario case studies: at field scale for a program of 13 plant-protection products applied annually for 20 yr and at a watershed scale for a mixed land-use s...
2004;14:354–62. 5. Ginevan ME, Ross JH, Watkins DK. Assessing exposure to allied ground troops in the Vietnam War: A comparison of AgDRIFT and Exposure Opportunity Index Models. J Expo Sci Environ Epidemiol 2009;19:187–200. 6. Ginevan ME, Watkins DK, Ross JH, O’Boyle RA. Assessing exposure to allied ground troops in the Vietnam War: A quantitative evaluation of the Stellman Exposure Opportunity...
We investigate the problem of reasoning with imprecise quantitative information. We give formal semantics to a notion of approximate observations, and deene two types of entail-ment for a knowledge base with imprecise information: a cautious notion, which allows only completely justiied conclusions, and a bold one, which allows jumping to conclusions. Both versions of the entailment relation ar...
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