Download or read book Benzo a pyrene Metabolism in the American Oyster Crassostrea Virginica written by Robert Simpers Anderson and published by . This book was released on 1978 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Benzo a pyrene Metabolism in the American Oyster Crassostrea Virginica written by Robert Simpers Anderson and published by . This book was released on 1978 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect of heterozygosity on metabolism during starvation in the American oyster Crassostrea virginica written by P.G. RODHOUSE and published by . This book was released on 1984 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Metabolic End Products of the American Oyster Crassostrea Virginica Gmelin written by Harold W. Goforth and published by . This book was released on 1974 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Evaluation of Benzo a pyrene Metabolism in an Oyster Ostrea Edulis bacteria System written by Diane Leigh Bunting and published by . This book was released on 1978 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt: The overall objective of this research project was to evaluate the metabolism of benzo(a)pyrene (BaP) by the European flat oyster (Ostrea edulis)-bacteria system. Individual oysters exist in nature as "systems" with commensal microorganisms and should be recognized as such when the metabolism of a specific environmental contaminant is being studied. Since bivalves are exposed to environmental pollutants that enter coastal waters, it is important to determine if the "natural" oyster system can detoxify those contaminants likely to cause biological damage. Tritiated-BaP was incubated with whole animal multienzyme preparations of (1) oyster/bacteria and (2) bacteria-free oyster. Background controls were run with homogenizing buffer (no oyster tissue added), homogenizing buffer + antibiotics (no oyster tissue added) and autoclaved oyster/bacteria multienzyme systems. Extraction techniques allowed separation of four fractions: (1) unmodified 3H-BaP plus simple non-conjugated derivatives; (2) 3H-BaP - glucuronides and -sulfates; (3) other 3H-BaP polar derivatives susceptible to cleavage by base/acid hydrolysis; and (4) the remaining 3H-BaP derivatives tightly bound and unaffected by previous treatment. Further separation of the unaltered 3H-BaP and the simple non-conjugated derivatives was effected by thin-layer chromatography. The results show a metabolic conversion of 3H-BaP by both multienzyme systems to simple, non-conjugated 3H-BaP derivatives and to other more polar 3H-BaP derivatives which were not susceptible to cleavage by glucuronidase/sulfatase or hydrolysis treatment. Hydrolysis-susceptible 3H-BaP metabolites were detected in the oyster/bacteria multienzyme preparations. Thus, it was not possible to clearly distinguish the metabolism of BaP by bacterial multienzymes from that of oyster multienzymes, but it does appear that the major proportion were contributed by oyster multienzymes. There were several additional points of interest. The treatment of oysters with antibiotics prior to and during the 3H-BaP incubation eliminates their indigenous bacterial flora as established by most-probable-number analyses of bacterial numbers. Further studies are required to determine whether or not metabolic conversions are due to the presence of bacterial cell-free enzymes. Also, the importance of establishing a background measure by an inviable enzyme incubation with the substrate is deemed critical as a result of this study. Finally, two oxidative degradation products are formed during the stustrate incubation, the subsequent organic extraction and/or the TLC preparation.
Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1991 with total page 806 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Long term Environmental Effects of Offshore Oil and Gas Development written by D.F. Boesch and published by CRC Press. This book was released on 1987-03-24 with total page 722 pages. Available in PDF, EPUB and Kindle. Book excerpt: Long-term Environmental Effects of Offshore Oil and Gas Development contains 14 chapters by different authors which focus on the US.
Download or read book Histochemical and Immunohistochemical Techniques written by Peter H. Bach and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: Toxicological and pharmacological effects arise when chemicals interact with biophysiological functions in discrete cell types. There is a continuing need to screen novel compounds for their potential therapeutic effects, and once these have been "discovered" to understand their molecular actions, as the basis of using such compounds safely and for rational drug design. Pharmacology now uses all of the sophisticated molecular research techniques that are available for the development of safer and more efficacious drugs. Histochemistry has been usefully applied to developing new drugs (and assessing chemical safley) and is potentially cost effective. The need to test novel substances for their potential adverse effects has raised many questions. Toxicological pathology has moved away from the cataloging of lesions towards understanding the basis of the events that underly cell injury, especially for those secondary consequences of chemical injury that lead to malignancy and chronic disease. The focal nature of toxicologic lesions de mands the use of microtechniques to provide data to help understand these questions. Histochemistry is under-utilized, but offers one of the key ap proaches necessary to address the problem of understanding interactions between a cell population and a chemical, the modulation of cellular biochem istryor the presence of a lesion in a test animal can be rationalised in terms of species differences that have no relevance to man as opposed to those that are of clinical significance or represent a warning of dire consequences to man.
Download or read book Metabolism of Polycyclic Aromatic Hydrocarbons in the Aquatic Environment written by Usha Varanasi and published by CRC Press. This book was released on 1989-03-31 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book shows how the biological transport, bioaccumulation, disposition, and toxicity of polycyclic aromatic hydrocarbons (PAH) in the aquatic environment are influenced by the ability or inability of organisms to metabolize these environmental pollutants. Written by leading scientists in the fields of PAH metabolism and toxicity in both aquatic and mammalian systems, this book discusses recent advances in the areas of PAH biogeochemistry and bioaccumulation, microbial degradation, enzymes of activation, and detoxication, metabolism of PAH, and laboratory and field studies on carcinogenic/toxic effects. Additionally, important similarities and differences in metabolism of PAH by aquatic and terrestrial organisms are featured. The discussion of bioavailability, metabolism, and subsequent toxic effects should aid in the assessment of the ecological consequences of PAH in the aquatic environment.
Download or read book Environmental Health Perspectives written by and published by . This book was released on 1993 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Monthly Catalogue United States Public Documents written by and published by . This book was released on 1981 with total page 876 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Monthly Catalog of United States Government Publications written by and published by . This book was released on 1981 with total page 878 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Indexes written by United States. Environmental Protection Agency and published by . This book was released on 1983 with total page 1760 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Persistent Pollutants in Marine Ecosystems written by Colin H. Walker and published by Elsevier. This book was released on 2013-10-22 with total page 285 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new volume from the SETAC (Society of Environmental Toxicology and Chemistry) Special Publications Series examines the phenomenon of persistent pollutants in the seas and oceans. Unlike the highly visible and obvious effects caused by oil, certain chemicals have unseen but long-term and far-reaching effects on the marine ecosystem. They often have long half-lives, are carried great distances and pass easily through the food chain from prey to predator. The behaviour and effects of these persistent pollutants on each type of marine animal (invertebrates, vertebrates, fish, mammals and fish-eating birds) are described. A final overview draws the observations and conclusions together presenting a work that provides a foundation for understanding the behaviour of persistent pollutants in the marine environment.
Download or read book Annual Report on National Cancer Institute and Environmental Protection Agency Projects written by and published by . This book was released on 1983 with total page 608 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advances in Comparative and Environmental Physiology written by and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 221 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Comparative and Environmental Physiology helps biologists, physiologists, and biochemists keep track of the extensive literature in the field. Providing comprehensive, integrated reviews and sound, critical, and provocative summaries, this series is a must for all active researchers in environmental and comparative physiology.
Download or read book Animals as Monitors of Environmental Pollutants written by and published by National Academies. This book was released on 1979-01-01 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aquatic pollutants. Heavy metals. Air pollution. Fluoride. Pesticide toxicity.
