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2 Polish Journal of Environmental Studies

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Chitinase activity production by planktonic, benthic and epiphytic bacteria inhabiting the Moty Bay of the Jeziorak Lake [Poland]

100%

Donderski W. , Trzebiatowska M.

Polish Journal of Environmental Studies

1999

tom 08

nr 4

A study on the occurrence and chitinolytic activity of planktonic, benthic and epiphytic bacteria was carried out in the Moty Bay of lake Jeziorak near Ilawa. The greatest number of chitinolytic bacteria occurred on macrophytes. In terms of percentage, the chitinolytic bacteria share among heterotrophic bacteria was much greater in epiphytic and planktonic bacteria than in benthic ones. When confronted with colloidal chitin all the investigated strains showed maximum chitinolytic activity after 96 h incubation and the minimum one after 48 hours. The greatest total chitinase activity was recorded in planktonic bacteria, while specific activity - in epiphytic bacteria.

The influence of heavy metals on the activity of chitinases produced by planktonic, benthic and epiphytic bacteria

100%

Donderski W. , Swiontek Brzezinska M.

Polish Journal of Environmental Studies

2005

tom 14

nr 6

Research was carried out on the influence of heavy metals on the activity of chitinases produced by chitinolytic bacteria isolated from Moty Bay in Lake Jeziorak. In tests on the concentration of heavy metal ions in the surface water, the highest concentration of copper and zinc ions was found in July in the littoral zone, of cobalt ions in September in the pelagic zone and of lead ions in August, also in the pelagic zone. Studies on the number of chitinolytic bacteria have shown that the highest number of chitinolytic bacteria among the total number of heterotrophic bacteria occurred on macrophytes and in bottom sediments. The highest percentage of chitinolytic bacteria was found in the surface water, and the lowest in the bottom sediments. As follows from research on the influence of heavy metals on the activity of chitinases , in the majority of the strains tested, heavy metal ions inhibited chitinolytic activity as concentration increased.