Contamination of Russian Baltic fish by polychlorinated dibenzo-p-dioxins, dibenzofurans and dioxin-like biphenyls.

Nineteen species of fish products caught and produced in the Russian economic zone of the Baltic region in 2002-2005 were analyzed for polychlorinated dibenzo-p-dioxins (PCDDs), dibenzofurans (PCDFs) and dioxin-like biphenyls (WHO-PCBs). Freshwater fish had significantly lower PCDD/PCDFs levels than most saltwater fish, except cod's fillet for which TEQ was comparable. In some cases pollutant levels of sea fish tissues essentially exceeded current regulatory values.

Action of surface-active substances on biological membranes. II. Hemolytic activity of nonionic surfactants.

The hemolytic action of commercially available nonionic surfactants and synthesized polyoxyethylene fatty acids and mercaptans on human erythrocytes was measured. It is shown that the hemolytic power of the detergents depends on the mutual effect of the hydrophobic and hydrophylic fragments of the agent molecule and does not depend on the hydrophile-lipophile balance of the compounds. A graphical image of the structure-activity relationship obtained in the study is similar to the one found in the literature when studying the analgesic effect of imidazoline derivatives on rats in vivo.