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    STUDIA BIOLOGIA - Ediţia nr.1 din 2001  
         
  Articol:   INFLUENŢA UNOR METALE GRELE ASUPRA METABOLISMULUI CELULAR AL DROJDIILOR.

Autori:  LETIŢIA OPREAN. 		 
       
         
  Rezumat:  Influence of Some Heavy Metals on the Metabolism of Yeast Cells. The paper presents the results of a comparative research on the influence of some heavy metals (Cd, Pb, Cu, Mn and Zn) on the cell metabolism of the beer yeast Saccharomyces carlsbergensis. During the alcoholic fermentation we have examined the dynamics of the wort fermentation due to the yeast, in the presence of these metals, measuring the amount of CO2 produced in 24 hours and the number of the living yeast cells in the wort, using standard methods. The results have shown that the heavy metals have a differentiated toxic effect on the yeast cell metabolism. The toxic effect can be correlated both to the specific action of each metal and to the metal amount in the fermentation medium. It can be determined a certain order of the toxicity degree of the studied metals on the fermentation dynamics of the wort and on the number of the living yeast cells in wort. Thus, the decreasing order of the toxicity degree of the studied metals is: Cd>Pb>Cu>Mn>Zn. The beer yeast Saccharomyces carlsbergensis can be used as a bioindicator for the heavy metals existing in food.  
         
     
         
         
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