Xem 1-20 trên 80 kết quả Toxic environment
  • Human activities have a large and important impact on the environment. Naturally occurring elements or compounds are often concentrated and redistributed in the environment through industrial processes, power production, and consumer activity. For example, lead, which is found in naturally occurring mineral deposits, has become a major pollutant through its use in batteries, paints, and gasoline additives.

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  • Dr. Samuel Luoma has given us an excellent description and analysis of the science of silver and nanosilver. His paper raises many questions for policy makers. Its subtitle, “Old Problems or New Challenges,” is appropriate, because the subject of the paper is both. Metals are among the oldest of environmental problems. Lead, silver and mercury have posed health hazards for thousands of years, and they are as persistent in the environmental policy world as they are in the environment.

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  • It is likely that with climate change (which could lead to increased rainfall, river flows, and higher coastal storm surges) and development pressures, flood risk in England is going to increase in the future, with potentially the most significant changes likely to happen in the latter half of the century. The Environment Agency has prepared a Long-term investment strategy that will allow us to understand future levels of risk and what investment may be needed to manage it over the next 25 years and beyond.

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  • Freshwater sources and oceans have an amazing natural ability to break down some waste materials, but not in the quantities discarded by today' s society. The overload that results eventually puts the ecosystem out of balance. Sometimes nature itself can create these imbalances. But most often our waterways are being polluted by municipal, agricultural and industrial wastes, including many toxic synthetic chemicals which cannot be broken down at all by natural processes.

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  • If we do not succeed in putting our message of urgency through to today's parents and decision makers, we risk undermining our children's fundamental right to a healthy, life-enhancing environment. Unless we are able to translate our words into a language that can reach the minds and hearts of people young and old, we shall not be able to undertake the extensive social changes needed to correct the course of development. The Commission has completed its work. We call for a common endeavour and for new norms of behaviour at all levels and in the interests of all. ...

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  • Within its Agenda 2000 reform package, the EU has introduced a new rural development policy which streamlines rural development measures implemented in its Member States. All measures falling under this pillar of the Common Agricultural Policy (CAP) are notified under the Green Box. These fall into two groups. Firstly, the new accompanying measures of the 1992 McSharry reform, such as early retirement, agri-environment and afforestation, as well as the less-favoured areas (LFA) scheme.

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  • Because of the potential public health implications, the importance of toxic air pollutants in ambient air has been recognized to some degree for many years. Efforts to “regulate” human activities resulting in the production of ambient air pollutants probably date back many centuries, even as the combustion of fossil fuels and air pollution from other organized human activities began having a noticeable impact on the environment.

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  • How are pollutants transformed after their release into the environment? How are organisms exposed, and how do physiological alterations impact population dynamics and community structure? What direct or indirect impacts occur? As early as the 50s and 60s people living near industrial plants began to recognize undesirable changes in their environment - and to ask these very questions. The discipline of environmental toxicology addresses these questions.

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  • It is a general belief that the fruits and vegetables that our parents ate when they were growing up were more nutritious and enriched with essential mineral nutrients and were less contaminated with toxic trace elements than the ones that are being consumed by us currently. A study of the mineral content of fruits and vegetables grown in Great Britain between 1930 and 1980 has added weight to that belief with findings of such decreases in nutrient density.

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  • Such pesticides are widely used agricultural inputs, and they are esters of the phosphoric acid and the derivates thereof, and they share in common as a pharmacological characteristic, the action of inhibiting enzymes having esteracic activities, and more specifically, the inhibition of the acetylcholinesterase. They are easily hydrolyze and they have a low capacity of remaining in the environment (Palacios and Moreno, 2004), (Chakraborty, 2009), (Ntow et al, 2009). Other pesticides under study are the organochlorated, which are persistent, lypophilic and very steady.

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  • Tham khảo sách 'committee on toxicity of chemicals in food, consumer products and the environment - subgroup report on the lowermoor water pollution incident', khoa học tự nhiên, công nghệ môi trường phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • The Council Directive 85/337/EEC of 27 June 1985 on the assessment of the effects of certain public and private projects on the environment 1 , as amended, known as the "EIA" (environmental impact assessment) Directive, requires that an environmental assessment to be carried out by the competent national authority for certain projects which are likely to have significant effects on the environment by virtue, inter alia, of their nature, size or location, before development consent is given. The projects may be proposed by a public or private person.

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  • We believe that it is interesting to study the system and software architecture of environments which integrate the evolving ideas of computational grids, distributed objects, web services, peer-to-peer networks and message oriented middleware. Such peer-to-peer (P2P) Grids should seamlessly integrate users to themselves and to resources which are also linked to each other. We can abstract such environments as a distributed system of “clients” which consist either of “users” or “resources” or proxies thereto.

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  • Local institutional investors in Brazil—pension funds and mutual funds—have been less active in the equity market. For instance, mutual funds’ asset allocation has been concentrated in safe and liquid assets such as government bonds and repo transactions. Pension funds, whose return target is typically set to achieve a certain spread over the rate of inflation in the context of a high short-term interest rate environment, tend to invest in inflation-linked bonds rather than equities.

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  • Chemicals are able to bring about both desirable and undesirable effects on organisms to which they are exposed, and the actions of medicines and poisons and toxic agents have been recognized for thousands of years. As a result of industrialization, modern man and the environment is now exposed to increasing numbers of chemicals. Because of their potential hazard, there is an appreciation of the requirement to assess the effects of these chemicals. Since chemical structure was elucidated (for a very brief history see Table 1.

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  • Research in anoxic environments is a relatively new and rapidly growing branch of science that is of general interest to many students of diverse microbial communities. The term anoxia means absence of atmospheric oxygen, while the term hypoxia refers to O 2 depletion or to an extreme form of “low oxygen.” Both terms anoxia and hypoxia are used in various contexts. It is accepted that the initial microorganisms evolved anaerobically and thrived in an atmosphere without oxygen. The rise of atmospheric oxygen occurred ~2.

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  • The committee is grateful for the contribution of participants at its three public meetings. The presentations and discussions at these meeting were valuable in informing the committee about relevant research findings, issues of interest in the research community, the perspectives of advocacy organizations, and the concerns of individuals with breast cancer and their families. The agendas for these meetings appear in Appendix A.

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  • Notwithstanding these developments in the area of governance, a recent Summit of the Organ Troika5 on Politics, Defense and Security of the South Africa Development Corporation (SADC) held at the end of March 2011 in Zambia, noted that the implementation of the GPA has been slow. The Summit was not satisfied with the polarization of the political environment characterized by the resurgence of violence, arrests and intimidation in the country.

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  • Greenhouse gases such as CO2 and methane are believed to contribute to global warming. Dust is a common problem throughout all mining activities. Dust generated by vehicle traffic can be reduced through a variety of means. Where water resources are not limited, regular watering with mobile water trucks or fixed sprinkler systems is effec- tive. Otherwise the application of surface binding agents, the selection of suitable construction materials and the sealing of heavily used access ways may be more suitable.

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  • The treaty, called the Stockholm Convention on Persistent Organic Pollutants, is a major achievement. It starts by immediately targeting 12 particularly toxic POPs for reduc- tion and eventual elimination. More importantly, it sets up a system for tackling additional chemicals identified as unacceptably hazardous. It recognizes that a special effort may sometimes be needed to phase out certain chemicals for certain uses and seeks to ensure that this effort is made. It also channels resources into cleaning up the existing stockpiles and dumps of POPs that litter the world’s landscape.

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