Titlebook: Metal Ions in Biological Systems; Studies of Some Biom Sanat K. Dhar Book 1973 The Editor(s) (if applicable) and The Author(s), under exclu

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Transfer of Mercury and Cadmium from Terrestrial to Aquatic Ecosystems, many of the pollutive discharges of mercury and cadmium have been identified and assessed, the natural background concentrations of these elements in the environment due to release by weathering of rocks and volcanic events are not well understood.

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Biological Effects of Heavy Metal Pollutants in Water,ently for the study of heavy metals in water are lethality, growth, and reproduction. Behavioral changes and alterations in community structure are not normally investigated, even though they might have sizeable repercussions on the sustained survival of any species.

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Crystallography of a Metal-Containing Protein, Concanavalin A,ecause not all of these substances are found in plants. Some have been isolated from invertebrates and lower vertebrates such as fish (Pardoe and Uhlenbruck, 1970). A short review on lectins by Sharon and Lis (1972) has recently appeared and is an excellent source for additional references.

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Some Effects of Metal Ions on the Structure and Function of Nucleic Acids,to biological function at one concentration may be harmful at other concentrations. For this reason I shall not restrict the metals to be discussed to those commonly considered toxic, even though the interest of this symposium is focused upon toxicity.

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Transfer of Mercury and Cadmium from Terrestrial to Aquatic Ecosystems,onal news media (I), and inevitably the backlash has set in (2). Still, the ecological status of mercury and cadmium remains incompletely known. While many of the pollutive discharges of mercury and cadmium have been identified and assessed, the natural background concentrations of these elements in

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