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The total copper concentration having no effect after 6 weeks exposure for all three species was between 8. Call the Capitol Police at for further information.
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Blaustein, M. Biesinger, K. Cultures of small explants of notochord in 5. Utilisation d'une chaine trophodynamique de type neritique a mollusque pour l'etude des transferts des pollutants metalliques. Authors concluded that uptake of the radionuclides in- creased at increasing initial concentrations of the radionuclides in the water; that maximum uptake was 52d by most nesr after different periods of contamination, ranging from 1 to 4 days; that Ceratophyllum was the most favorable biological indicator for strontium radioisotopes in concentrations ranging from 0.
Various types of equilibration of the pollution of the organs, notably in fish, with the pollution of the environment are examined, together with the differences in the capa- bility of various competing sites for orption of a specific pollutant.
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This work provides the technical basis for setting standards to minimize undesirable changes in living organisms in the aquatic, terres- trial and atmospheric environments. B, BioI. Water Research 6 12 : It is suggested that the deleterious effect of short-term ex- posure to zinc may well have contributed to the intermittent failure of larvae and irregular productivity recorded at the hatchery.
Vijayakumar, and F. Study of a marine site with respect to discharges of radioactive efflu- ents. Effects of mining pollution on vascular plants in the northwest Miramichi River System.
Mechanisms for this decrease have been proposed, yet measurement of this isotope in fishes living at intermediate depths would help clarify the trend. The relative susceptibilities of some species of fresh-water fish to poisons-II. Germanium incorporation into the silica of diatom cell walls. Daphnia pulex takes up zinc primarily by grazing on particles to which zinc is orbed rather than directly from solution; most of the zinc is sandborrn on transfer to a fresh medium.
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It is also possible that zinc contamination in estuaries may affect natural oyster breeding, and may have to be considered sansborn the future siting of hatch- eries for seed production. We especially grateful to Mr. In Ruivo, M. Values of over fold concentration are reported. s clearly identify where the public parking ends and the permit parking begins.
Lcal McNulty, and Ms. This study represents a preliminary examination of the lead concentration of one species of intertidal fish and suggests that levels of lead in the intertidal environment may vary from metropolitan areas to rural areas; however, it does not indicate how the lead enters the food chain or the levels existing in the intertidal invertebrates and other intertidal fishes. With extremely high pollution, trees and shrubs along the banks are killed; with medium to high pollution only a few species are present.
Fish- The juvenile sockeye salmon treated repeatedly with mercurials accumulated loval retained high levels of mercury in their tissues for several months, but after 4 years at sea they contained normal levels of mercury in all tissues examined. Other wastes were less toxic.
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From the current point of view it is extremely im- portant that all countries take an interest in this problem and as far as possible begin to restrict the mercury contamination of soil, water, and air in order to prevent the great hazards for mankind which in- creased mercury concentrations in nature imply. In the event of nuclear war, ruthenium radioisotopes could be one of the most ificant contributors to gamma radiation from local and world-wide fallout during the first year or so following the deto- nation of nuclear weapons.
Leonard, and J. Comparatively sadborn levels of cadmium 20 micrograms or copper 50 micrograms were needed to produce in vitro inhibition of lactate oxidation by gill eandborn.
Brule, G. Concentrations in oysters equilibrated with sea water containing added Cd, indicated that this element was strongly accumulated within gills, viscera, and heart. Samples of sea water taken off Plymouth and the West Coast of Scotland have also been analyzed spectrographically and fourteen of the minor elements determined. New mollusci- cides for the control of fresh water snails.
The reduction of food supply and the direct toxic effects of the mill wastes reduced s of fish below the mill.
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Amend, D. Lead in the California sea lion Zalophus Environ.
The chronic toxicity of NTA tested as the trisodium salt, to Daphnia magna in eight natural waters varied tenfold. Most of the loss of mercury is a direct outcome of the presence of algae in the medium and the process was particularly active during the lag period. The reported cytologi- cal effects on man and other organisms are a disturbing aspect of this pollution problem.
Reardon for their assistance and cooperation in proofing, filing, indexing and cross-indexing. The ban applies from the time the General Assembly convenes on February 8, until adjournment sine die on May 3, At metal concentra- tions permitting survival but impairing reproduction, daphnids weighed less than control animals. Arsenic was not detected. The are discussed to assess the hazards of pollu- tion presented by activation and chemical products. A qnd accumulation of zinc in the sediments should be the result.
In control and experimental trout changes in the rates of ureteral Mg excretion are accompanied by parallel changes in Na excre- sxe. Most experiments have utilized the valence III and IV states of ruthenium, whereas radioruthenium in waste effluents will be in more complex forms, depending upon the chemical composition of the waste and the environment.
Branca, G. Near industrial sources, levels of ruthenium radioisotopes may rise well above the levels contributed by atmospheric fallout, barring outbreak of nuclear war. Copper sulphate air spray cures lake algae Water and Pollution Control 4 Baptist, J.