Significance of bacterial ectoenzymes in aquatic environments |
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Authors: | Chróst R J |
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Institution: | (1) Department of Microbial Ecology, Max-Planck Institute for Limnology, P.O. Box 165, D-2320 Plön, Germany;(2) Present address: Institute of Microbiology, University of Warsaw, ul. Nowy wiat 67, 00-046 Warsaw, Poland |
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Abstract: | The report presents studies on temporal and spatial variations of kinetics (Vmax and Km) of bacterial ectoenzyme activity ( -glucosidase - Glc, leucine aminopeptidase - Leu-amp) in the naturally eutrophic Plu see. Glc and Leu-amp activity were positively correlated with the flux of polymeric materials (polysaccharides, proteins) in the lake. Glc activity was low when algal populations grew actively, but during the algal bloom breakdown Glc activity increased rapidly. Leu-amp displayed the highest rates of activity in the epilimnion and was tightly coupled to bacterial production. The synthesis of studied ectoenzymes was under control of a repression/derepression mechanism. The significance of ectoenzymes for the transformation and bacterial utilization of organic matter, and their role in the microbial loop in aquatic environments is discussed. |
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Keywords: | organic matter bacteria ectoenzymes microbial loop |
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