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The separate and combined in vitro effects of heavy metal ions (Cu and Zn) at concentrations of 0.1–25 mg/L on the activities of maltase, sucrase, and amylolytic activity in the intestines of bream and roach caught in areas of the Rybinsk Reservoir differing in anthropogenic loads have been studied. In fish from the polluted Sheksninskii Reach, membrane maltase and sucrase enzymes are less sensitive...
In the initial period of acute stress, the concentration of Na in the plasma of roach and bream decreases by 30 and 70% in several hours, thereby causing a difference in the osmotic concentration of cellular and extracellular liquids of an organism. In response to this, defensive systems are activated. They have extracted Na and K ions from the cell against their electrochemical gradient. As a result,...
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