Download or read book Dioxin furan and Polychlorinated Biphenyl in Dungeness Crab Cancer Magister from Victoria and Esquimalt Harbours 1987 to 2003 written by W. D. Knapp and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Dioxin/furan and polychlorinated biphenyl (PCB) analyses were conducted on samples of Dungeness crab (Cancer magister) captured from Victoria and Esquimalt harbours between 1987 and 2003. Brief descriptions of the contaminant trends and characteristics are provided, based on toxic equivalents (TEQs) and congener profiles. Dioxin/furan TEQs in crab harvested from Victoria Harbour were variable within and between sites for all years, although an overall decline was observed and statistical analyses confirmed a significant decline in mean dioxin/furan TEQs. Dioxin/furan TEQs in crab from Esquimalt Harbour were approximately 90 % lower than those from Victoria Harbour and relatively consistent within and between sites. Statistical analyses indicated a significant increase in mean dioxin/furan TEQ in crab hepatopancreas; however, they were well below levels of concern for human consumption. The dioxin/furan congener profiles were similar for both Victoria and Esquimalt harbours with little change over time. PCB TEQs for Victoria Harbour were much higher (overall average of 54.7 pg/g) than those for Esquimalt Harbour (average of 14.75 pg/g). No PCB temporal trends were observed for either Victoria or Esquimalt Harbour. PCB congener profiles were found to be similar for Victoria and Esquimalt Harbours with little change over time. A comparison of 2003 dioxin/furan and PCB data from four B.C. pulp mill sites with 2003 Victoria Harbour data illustrated characteristic differences in contaminant profiles between harbour and mill areas. Victoria Harbour total (dioxin/furan and dioxin-like PCB) TEQs were clearly driven by the PCB component compared to pulp mill sites where the dioxin/furan TEQs were the main contributor. Dioxin/furan congener profiles illustrated the difference between harbour and mill sites, with unique congener 'fingerprints' for each suggesting different contaminant sources. The PCB congener profiles were found to be very similar between Victoria Harbour and the four pulp mill sites. Victoria Harbour was closed to commercial crab harvesting, with an advisory on consumption of crab hepatopancreas, in May 1992 due to elevated dioxin/furan levels. These closures continue as a result of unacceptably high concentrations of dioxin/furan and PCBs in crab hepatopancreas tissue. Esquimalt Harbour is not currently subject to dioxin/furan or PCB mediated crab harvest restrictions.
Download or read book Toxicological Profile for Chlorodibenzofurans written by and published by . This book was released on 1994 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Polychlorinated Biphenyls Dioxins and Furans in the Pontypool Environment written by David John Ball and published by . This book was released on 1995 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Polychlorinated Biphenyls Dioxins and Furans in the Pontypool Environment written by and published by . This book was released on 1994 with total page 61 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evaluation of the Toxicity of Dioxins and Dioxin like PCBs written by Allan H. Smith and published by . This book was released on 2001 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Determination of Polychlorinated Biphenyls Polychlorinated Dibenzo p dioxins and Polychlorinated Dibenzofurans in UK Soils written by and published by . This book was released on 1989-01-01 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Impact of PCBs Furan and Dioxin on Hepatocarcinogenesis written by Mohamed Helal and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Stockholm Convention defined polychlorinated biphenyls (PCBs) as a group of persistent organic pollutants (POPs) such as dioxin/furan, dichlorodiphenyltrichloroethane, polychlorinated biphenyls, polychlorinated dibenzo-p-dioxins, aldrin, polychlorinated dibenzofurans and organometallic compounds (such as organotin and organomercury) which share the same characteristics of being persistent, bioaccumulative and toxic and can travel long distance through various media. They have diverse health impacts with different underlined molecular mechanisms. Recently, PCBs were referred as potent carcinogens with persistent existence in the environment. As the liver is the organ of detoxification, it is the major target organ for toxic effects induced by environmental contaminants, including PCBs. PCBs, furan and dioxin exert their hepatocarcinogenic effect through different mechanisms such as induction of oxidative stress, an increase of reactive oxygen species (ROS), mutagenic induction to oncogenes and epigenetic alteration to hepatic cells. In this chapter, we will provide an updated overview about PCBs, furan and dioxins, their impact on liver cancer initiation and progression on various in vivo and in vitro systems and its underlined molecular mechanisms. Also, a special emphasis will be directed to highlight zebrafish as in vivo model system to analyse the hepatocarcinogenic effect of these pollutants.
Download or read book The Biogeochemistry of Mercury in the Environment written by Jerome O. Nriagu and published by Elsevier-North-Holland Biomedical Press. This book was released on 1979 with total page 720 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Endocrine Disruption in Fish written by David E. Kime and published by Springer Science & Business Media. This book was released on 1998-10-31 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt: The last half-century has shown a dramatic increase in the standard of living of millions of people in Europe, North America and many parts of the Third World. This has, in many ways been brought about by scientific and technical developments which were initiated in the 1940s and 1950s. Promises were then made that nuclear energy would provide electricity so cheap that it would not need metering, pesticides would end malnutrition throughout the world and plastics and other synthetic chemicals would revolutionise our manufacturing industry and our way of life. Whilst some of these promises have been fulfilled, the problems of long-term health risks to humans and wildlife arising from the use, production and disposal of these products were either unknown or deliberately understated. Nuclear power is rendered economically unviable when the real cost of decommissioning and storage of waste for several millenia is included, and the effects on health of both humans and wildlife of early pest eradication programmes with organochlorine pesticides were well documented in Rachel Carson's "Silent Spring". Evidence of the effects of aerosols and refrigerants on depletion of the ozone layer has led to restriction on the use of CFCs, and there is now increasing evidence of climate change resulting from our profligate use of fossil fuels.
Download or read book Systematic Parasitology written by Dr. Sheila Willmott and published by Springer. This book was released on 1981-01-01 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt:
