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2 Polish Journal of Environmental Studies

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Development and metabolic activity of bacteria isolated from polyhumic Stegwica Lake

100%

Donderski W. , Walczak M. , Wodkowska A.

Polish Journal of Environmental Studies

1997

tom 06

nr 5

This study concerns developmental intensity and metabolic activity of heterotrophic bacteria isolated from water of the littoral and pelagial zones of the polyhumic lake Stęgwica. The experiments were carried out with humic substances and [3H]-glucose in media with pH 6.0 and 8.0. It was found that the development and metabolic activity of most strains in the presence of humic substances were higher in the medium with pH 8.0 than in that with pH 6.0. It was found that humic substances in acid medium had an inhibitory effect on the development and metabolic activity of 90% of the strains of bacteria isolated from littoral zone and of 50% of the strains isolated from the pelagial zone.

Metabolic activity of heterotrophic bacteria in the presence of humic substances and their fractions

84%

Donderski W. , Burkowska A.

Polish Journal of Environmental Studies

2000

tom 09

nr 4

Metabolic activity of heterotrophic bacteria isolated from lakes Stęgwica, Jeziorak and Jasne were investigated. A humic substances of commercial preparation by Aldrich-Chemie, as well as natural humic substances, fulvic and humin acids isolated from lake Stegwica were used as a source of energy. The results indicate that 70-80% of bacteria strains are able to utilise the humus matter. The greatest metabolic activity was recorded in bacteria which were supported by natural humic substances isolated from lake Stęgwica; whereas the lowest was noted in the presence of humin acids.