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    STUDIA BIOLOGIA - Issue no. 1 / 2004  

  Abstract:  Utilisation of the Enzymatic Indicator of Mud Quality for Exploitation and Protection of Salt Lakes. We have determined six enzymatic activities (phosphatase, urease, protease, catalase, actual dehydrogenase, potential dehydrogenase) and three nonenzymatic catalytic activities (H2O2 splitting in autoclaved samples, TTC-[2,3,5-triphenyltetrazolium chloride] reduction in autoclaved samples, without or with glucose addition) in the muds of the salt lakes Techirghiol, Nuntaşi and Costineşti, during four seasons (summer and autumn 2002, winter and spring 2003, respectively). The enzymatic and the nonenzymatic catalytic activities varied depending on the season, lake and the collection zone. The highest values were obtained in the mud of the Techirghiol lake, being followed by the Costineşti and the Nuntaşi lakes. Generally, no evident seasonal variations were registered.. Based on the enzymatic indicator of mud quality (EIMQ), we could determine the quality of the mud in the three analysed lakes. The mud of the Techirghiol lake is a very active one, the EIQM values being between 0.5 and 0.59. The mud of the Costineşti lake had an EIQM between 0.4 and 0.6, while the mud of the Nuntaşi lake had the EIQM of 0.3-0.45. Taking into consideration the biological stability of the mud through the variability coefficients, we were able to establish that the muds of the Nuntaşi and Costineşti lakes indicate an evolution towards high quality muds. By means of the EIQM we could estimate the evolution of the mud in the three lakes, in comparison to the situation registered 20 years ago. In the case of Techirghiol lake the value of EIQM increased with 0.4 units, in the case of Costineşti lake it increased with 0.2 units and in the Nuntaşi lake with 0.1 units. The EIQM may be used for determining the quality of the muds, in order to use them in balneotherapy or in decting of their some negative modifications ľ having this way the possibility to protect the lakes.  
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