[Impact of cooking on the content of fish mercury].

Changes in the levels of mercury in the fish inhabiting the water reservoirs of Russia were studied after cooking it in a variety of ways (boiling for different time periods, roasting, and smoking). To have a general idea of the impact of various procedures for cooking the fish on its mercury amount, the authors measured mercury concentrations in smoked perch and manufactured and homemade canned salt-and fresh-water fishes. The absolute content of mercury in the fish is shown to be unchanged during its cooking and not to depend on the procedure and duration of the latter.

[Regeneration of photoreceptor organs in freshwater planarians at different levels of accumulation of natural methylmercury compounds].

The effects of natural methylmercury compounds on regeneration of photoreceptor organs were studied in three freshwater planarians: Polycelis tenuis, Dugesia lugubris, and D. tigrina. Accumulation of methyl mercury in the planarian body suppressed regeneration of P.

[Effect of household sewage on the fertility and size of Ceriodaphnia affinis Lill. in series of generations].

Seven generations of Ceriodaphnia affinis were kept in water of a household sewer. No animal death was observed in the experiment. In a series of generations, the fertility as well as dimensions of newborn water fleas decreased starting from the third generation.