Xem 1-16 trên 16 kết quả Bioaccumulation
  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Bioaccumulation and toxicity of selenium compounds in the green alga Scenedesmus quadricauda

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  • (BQ) Part 1 book "Chemistry in the oil industry VII" has contents: An overview of the harmonised mandatory control system; bioaccumulation potential of surfactants - a review; use of enzymes for the in situ generation of well treatment chemicals; the use of surfactants to generate viscoelastic fluids,...and other contents.

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  • This book proposes a framework for a national-scale program to monitor changes in mercury concentrations in the environment following the reduction of atmospheric mercury emissions. The book is the product of efforts initiated at a workshop held in Pensacola, Florida, in September 2003, involving more than 30 experts in the fields of atmospheric mercury transport and deposition, mercury cycling in terrestrial and aquatic ecosystems, and mercury bioaccumulation in aquatic food webs and wildlife.

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  • This is a dangerous combination. The persistence and mobility of POPs means that they are literally everywhere in the world, even in the Arctic,Antarctica, and remote Pacific islands. Their attraction to fatty tissue, known as "bioaccumulation", means that even though a poison is first dispersed widely and thinly it gradually starts to concentrate as organisms consume other organisms as they move up the food chain.

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  • READING Water pollution is the introduction into fresh or ocean waters of chemical, physical, or biological material that degrades the quality of the water and affects the organisms living in it. This process ranges from simple addition of dissolved or suspended solids to discharge of the most insidious and persistent toxic pollutants (such as pesticides, heavy metals, and nondegradable, bioaccumulative, chemical compounds).

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  • The Bioaccumulation of Mercury, Methylmercury, and Other Toxic Elements into Pelagic and Benthic Organisms - Rất nhiều yếu tố độc hại đối với sinh vật, nhưng thường chỉ trong một hình thức hóa học cụ thể. Ví dụ, mặc dù vô cơ thủy ngân (Hg) là độc hại cho sinh vật ở nồng độ thấp, nó là hình thức hữu cơ của Hg, monomethylmercury (mmHg), đó là cao bioaccumulative và tài khoản cho những mối quan tâm động vật hoang dã và sức khỏe từ việc tiêu thụ cá cao mmHg burdens.

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  • Schröder et al. Environmental Sciences Europe 2011, 23:19 http://www.enveurope.

    pdf14p dauphong13 10-02-2012 29 6   Download

  • This is a frightening development. There are traces within you – or, depending on your circumstances and exposures, more than traces – of several hundred man-made chemicals. Many are harmless (or at least are so far thought to be). Others, however, may cause cancer and damage the nervous systems, reproductive systems, immune systems, or livers of animals. Mounting scientific evidence is confirming long-term suspicions that they do the same to human beings.

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  • The Minamata poisoning episode provided local researchers with the hard evidence that first linked mercury discharges to its bioaccumulation in the environment. Cats in Minamata were the first to show signs of mercury poisoning, although at the time the unusual behaviour exhibited by the cats was unexplained. The disease was known locally as “dancing cat disease” in reference to the uncontrollable muscle spasms and tremors seen in the poisoned cats.

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  • Define ecological biochemistry. • Explain biochemical adaptation and the roles of secondary compounds. • Describe detoxification and the primary metabolic pathways in plants and animals. • Explain the key processes and factors involved in biotransformation & biodegradation. • Explain the concepts of sequestration, bioaccumulation, and biomagnification. • Contrast different forms of ecological biochemical interaction.

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  • Two samples were also analysed for polychlorinated dioxins and furans (PCDD/Fs), a class of chemical that can be formed during the combustion of materials present in e-waste. Soil from an open burning site was moderately contaminated, while sediment from the Agbogbloshie lagoon contained a very high level of these highly toxic, highly persistent and bioaccumulative chemicals, at a level just below the threshold defined as being indicative of serious contamination for sediments in the Netherlands.

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  • an effort to ensure the wise use of taxpayers’ money, the federal government has undertaken major initiatives to evaluate the performance and results of federally funded programs, including research and development (R&D) programs. The initiatives include the Government Performance and Results Act of 1993 and the Office of Management and Budget (OMB) Program Assessment Rating Tool (PART), developed in 2002. The latter was designed in the context of “performance budgeting” and “performance measurement” and focused on evaluating the efficiency of programs.

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  • Inorganic mercury is toxic when humans or wildlife are exposed to high levels for a short peri- od of time. Organic methylmercury has a greater tendency to accumulate in the body over time, eventually causing harm, even in small amounts. Methylmercury has the three properties that make substances particularly harmful to humans and other organisms — it persists, it bioaccumulates, and it is toxic to most life forms. The health effects of mercury are described in more detail in the next chapter of this primer.

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  • In recent years, awareness of the vulnerability of the environment has increased, as evidenced by new and developing international policies for environmental protection, starting with the Rio Declaration of 1992. In the context of ionizing radiation, the existing international approach is largely based on providing for the protection of humans, but this is being critically reviewed in several international fora.

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  • The hazards of methylmercury poisoning received modern international attention in 1956 when many of the residents of Minamata, Japan, became seriously ill, or died, after eating the fish and shellfish in Minamata Bay. A chemical plant that used methylmercury to manufacture plastic (acetaldehyde) was dumping methylmercury-contaminated wastes into Minamata Bay. The mercury built up or bioaccumulated in the fish and shellfish, which were a major part of the residents’ diets. A similar tragedy unfolded in the nearby town of Nigata, Japan.

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  • Copper fungicides are environmentally unfriendly. They are very toxic to fish and aquatic invertebrates, such as crab, shrimp and oysters. There are cases where most animal life in soil, including large earthworms, have been eliminated by the extensive use of copper-containing fungicides in orchards. It is strongly bioaccumulated and is very persistent. Once a soil is contaminated with copper, there is no practical way to remove it. The organic insecticide rotenone has been found to be toxic to pigs, rats and dogs and is is very toxic to fish. It causes skin and eye irritations.

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