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  1. 2 Biotechnologia

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  1. 2 1994

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  1. 2 Chrost R. J.

  2. 2 Gajewski A. J.

  3. 1 Lalke E.

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1

The effect of cadmium and lead ions on microbial decomposition of organic biopolimers in an eutropic lake

100%
Gajewski A. J., Chrost R. J.
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issue 3
71-81
EN
The effects of cadmium and lead ions on bacterial ectoenzymatic activities and on the rates of organic substrates uptake were investigated in short-period experments.Both the acivitiees of ectoenzymes and rates of organic substrates uptake by bacteria were strongly inhibited by studied metal ions even in their low concentrations.Three types of inhibition: competitive (aminopeptidase) ,noncompetitive (lipase) and mixed (alkaline phosphatse) due to Pb and Cd ions were observed.The potential mechanisms of changes of the physical and chemical properties of studied enzymes by cadmium and lead were discussed.
2

Mechanisms and control of microbiological processes of degradation and utillization of organic mater in lacustrine ecosystems of different degrees of eutrophication

81%
Chrost R. J., Gajewski A. J., Lalke E.
Biotechnologia
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1994
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issue 4
82-95
EN
The report presents the results of a study of phytoplankton primary and bacterial secondary production and enzymatic activities in surface lake water sampled from five lakes (Mazurian Lake District, Poland) of different degrees of eutrophication during summer stratification period.The rates of bacterial processes related to the tropic status of the lakes.The magnitude of bacterial production was strongly depended on bacterial enzymatic degradation of polymeric organic matter.Through the production of hydrolitic enzymes bacteria were capable of utilizing a variety of polymeric substrates, otherwise not utilizable, which predominated in lake water.The autors also propose and discuss a model of flow of organic matter in aquatic ecosystems and a role of bacteria and phages in this process.
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