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Enzymatic activity and degradation of organic macromolecules by neustonic and planktonic bacteria in an estuarine lake

100%

Mudryk Z. J., Skorczewski P.

Polish Journal of Ecology

2006

tom 54

nr 1

Neustonic (film layer ~ 90 µm, surface layer ~ 240 µm) and planktonic bacteria (subsurface layer ~ 10–15 cm) participating in the processes of decomposition of organic macromolecular compounds, and their potential capability to synthesise extracellular enzymes were studied in a shallow estuarine lake (Lake Gardno – Baltic coast). The studied bacteria were capable of decomposing a wide spectrum of organic macromolecular compounds. Most bacteria inhabiting surface and subsurface water layers hydrolysed lipids, proteins and DNA. The microflora hydrolysing cellulose was represented by the least abundant group of organisms. Of the studied enzymes, alkaline and acid phosphatases, leucine arylaminase, esterase, and esterase lipase were synthesised most actively while β-glucouronidase (βGl) and α-fucosidase (αFu) were synthesized least actively. It can be clearly seen that enzymatic activity was stratified, and there were differences between studied water layers. Bacterial strains isolated from surface and subsurface layers were more active in synthesizing extracellular enzymes than bacteria inhabiting the film layer. Bacteria isolated from various parts of Lake Gardno synthesized the tested hydrolytic enzymes with a similar intensity.

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Decomposition of organic macromolecular compounds by heterotrophic bacteria inhabiting surface microlayer, subsurface water and sediment-water interface in the marine harbor channel

84%

Perlinski P., Mudryk Z. J., Zdanowicz M.

Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline

2018

tom 22

Potential capability of heterotrophic bacteria to hydrolytic degradation different organic macromolecules in three water layers in the marine channel were determined. In studied channel hydrolysed proteins and lipids. The heterotrophic microflora decomposition chitin were represented by the least abundant group of these organisms. The highest number of bacteria hydrolyzing tested organic macromolecules isolated from surface microlayer. It was demonstrated that no significant differences in number of bacteria decomposition studied organic compounds existed between different parts of harbour. Bacteria isolated from the water studied channel in different seasons hydrolyzing organic macromolecules with different intensity.

Ograniczanie wyników

1 Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline

1 Polish Journal of Ecology

2 Mudryk Z. J.

1 Perlinski P.

1 Skorczewski P.

1 Zdanowicz M.

1 2018

1 2006

Wyniki wyszukiwania

Enzymatic activity and degradation of organic macromolecules by neustonic and planktonic bacteria in an estuarine lake

Decomposition of organic macromolecular compounds by heterotrophic bacteria inhabiting surface microlayer, subsurface water and sediment-water interface in the marine harbor channel