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    STUDIA BIOLOGIA - Issue no. 2 / 2005  
         
  Article:   CERCETĂRI ENZIMOLOGICE ASUPRA SEDIMENTELOR RÂULUI SOMEŞ LA CONFLUENŢA CU RÂUL LĂPUŞ.

Authors:  CRISTINA BUZAN, MIHAI DRĂGAN-BULARDA. 		 
       
         
  Abstract:  Enzymological Research on Sediments from the Someş at Confluence with the Lăpuş River. Sediments of the Someş river were studied enzymologically. The following 5 enzymatic and nonenzymatic catalytic activities have been measured: phosphatase, catalase, actual and potential dehydrogenase, nonenzymatic H2O2-splitting capacity. The analyses were carried out seasonally, during the years 2002-2003, in 3 points along the river stream: one of them is Bozanta Mare, the others being situated upstream and downstream of the confluence of the Somes with Lapus river. All the studied activities were detected in all the samples analysed. Based on the analytical data, the enzymatic indicators of sediment quality (EISQs) were calculated. Seasonal differences were registered, with the highest values in autumn and the lowest ones in winter. The chemical pollution at the Bozânţa Mare point resulted in lower values of the enzymatic activities, and, consequentely of the EISQ. The high values of the EISQ 20 km downstream from the pollution point, closed to that registered upstream, reflects the good autoregenerative capacity of the studied sediments.  
         
     
         
         
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