EVALUATING THE POLLUTION FROM MUREŞ RIVER ON ARAD-PECICA SECTOR BASED ON ENZYMATIC ACTIVITIES FROM SEDIMENTS (WESTERN ROMANIA). - Treitli, Sebastian; Filimon, Mărioara Nicoleta; Petrucean, Claudia (Annals of Oradea University, Biology Fascicle / Analele Universităţii din Oradea, Fascicula Biologie, 2011)