Polysaccharide and xenobiotic-metabolizing enzymes as biomarkers of contamination of Lymnaea palustris (Mollusca, Gastropoda) by atrazine and hexachlorobenzene in freshwater mesocoms

atrazina atrazine chemical contamination contamination chimique crecimiento croissance enzimas enzyme enzymes enzymic activity fertilidad fertilite fertility freshwater molluscs growth herbicidas herbicide herbicides lymnaea metabolism metabolisme metabolismo mollusque d'eau douce moluscos de agua dulce mortalidad mortalite mortality polyholoside polysaccharides toxicidad toxicity xenobiotics