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The occurrence of lipolytic bacteria and the activity of extracellular lipases in a riverine ecosystem

100%

Skórczewski P. , Mudryk Z.

Oceanological and Hydrobiological Studies

2009

tom Vol. 38, No.4

89-101

This study determined the numbers and distribution of heterotophic and lipolytic bacteria and the activity of lipases in the water of the Słupia River, in the section of the river that flows through the city of Słupsk. From spring to fall the mean number of heterotrophic bacteria remained at a relatively constant level (158.3 × 103 cells cm^-3 – 169.4 × 103 cells cm^-3), whereas in winter a sudden drop to only 18.3 × 103 cells cm^-3 was found. The numbers of heterotrophic bacteria in the whole studied section of the river were similar. The mean number of lipolytic bacteria reached a maximum in spring (12.9 × 103 cells cm^-3), was high in summer (10.5 × 103 cells cm^-3), and reached a minimum (1.3 × 103 cells cm^-3) in winter. Lipolytic bacteria accounted for only 5 to 8% of the total number of heterotrophic bacteria. No marked differences in the numbers of lipolytic bacteria were determined within the section of the river studied. The highest levels of lipase activity were determined in spring (18.9 nM MUF dm^-3 h^-1) and fall (19.9 nM MUF dm-3 h-1), while the lowest (11.0 nM MUF dm^-3 h^-1) were noted in winter. There were no differences in the level of activity of lipolytic enzymes among the sites studied.

The occurrence of lipolytic bacteria and the activity of extracellular lipases in a riverine ecosystem

63%

Skorczewski P. , Mudryk Z.

Oceanological and Hydrobiological Studies

2009

tom 38

nr 4

89-101

Soil lipolytic activity under the cultivation of Salix viminalis L. enriched with sewage sludge. Part I

51%

Furczak J. , Joniec J. , Baran S.

2002

tom 35

nr 1

Studies performed in a field indicate that podzolic soil combined with sewage sludge under Salix viminalis L. cultivation exhibited an increase in lipolytic bacteria and fungi numbers as well as a clear stimulation of lipase activity at level A. These changes increased in accordance with the increase of sludge concentration in the soil, and remained in the second and the third year of the experiment. However, a decrease of lipase activity was observed in subjects with a higher sludge concentration in the third year. Disturbances of microbial and enzymatic soil properties after the addition of sewage sludge occurred less intensively at the 20-40 cm than the 0-20 cm layer. In general, a slight stimulation of lipolytic bacteria and fungi and a stronger stimulation of lipase activity was found with higher doses of sludge. As at level A, these changes remained active for two years, showing a decline of lipase activity in the third year.