Abstract
During the past year, worldwide attention has been focused on the hazards of mercury contamination of the environment. The emergence of mercury poisoning as a major public-health problem stemmed from the most recent findings concerning the mercury cycle in the aquatic environment. Until 1968 the erroneous belief had prevailed that mercury and the salts of mercury discharged into an ocean, river and lake would eventually be incorporated into the sediments of the receiving water and thus be removed from further ecologic involvement. It was discovered, however, that certain aquatic micro-organisms are able to convert the insoluble, inorganic forms of mercury . . .

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