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1

Microbiological transformation of organic matter in estuarine basins of the Polish coast.I.Decomposition of organic matter and heterotrophic activity of bacterioplankton in estuarine lakes

100%
Mudryk Z., Korzeniewski K.
Oceanological Studies
|
1995
|
issue 69/10
3-16
EN
The rate of organic matter decomposition, the abundance of heterotrophic bacteria, production of bacterial biomass and coefficients of heterotrophic activity of bacterial microflora have been determined for three estuarine lakes.Processes of organic matter destructions, biomass production as well as heterotrophic activity of bacteria displayed marked seasonal fluctuations.The highest rate of the processes studied was observed in heterotrophic lake Jamno and considerably lower in eutrophic lakes Lebsko and Gardno.The data gathered in the course of three-year-long research programme revealed the increasing rate of eutrophication processes in the aquatic basins investigated.
2

Preliminary studies on the organic matter deposition and particle filtration processes in a sandy beach in Sopot - southern Baltic Sea

88%
Kotwicki l., Danielewicz J., Turzynski M., Weslawski J. M.
Oceanological Studies
|
2002
|
vol. 31
|
issue 3-4
71-84
EN
Sopot?s intensively used sandy beach was studied to assess organic matter deposition and swash water filtration through the sediment on the water line. The swash water contained from 4 to 80 mg Total Suspended Matter (TSM) per dm3, 3 to 12% of it was organic. Phytoplankton ranged from 1 to 15 million cells per dm3, depending on the water turbidity and contained a mixture of pelagic and micro-phytobentic taxa. Plankton larvae and Rotatoria dominated the animal biomass. In the process of wave filtration through the sand all planktonic animals were retained in the sediment, while a number of meiofaunal Nematoda and Ciliata were actively transported (?washed out?) from the upper sediment layers. Macroscopic particle (filamentous algae) deposition in May ranged from 20 to 1000 g POC m-2 per day. Nutrient concentrations were higher in the interstitial water than in the swash water, for most of the year. Hence, we suppose that the Sopot municipal beach serves as a nutrient source for coastal waters.
3

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

88%
Gajewski A. J., Chrost R. J.
|
|
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.
4

Bioavailability and bioaccumulation of hydrophobic organic pollutants. Part II. Sorption of pollutants and factors influencing this process

75%
Oleszczuk P.
|
2007
|
issue 1
26-39
EN
Translocation, leaching, uptake by plants and degradation of hydrophobic organic pollutants are largely determined by the properties of the soil/sediments. The above properties influence those processes which directly or indirectly influence the bioavailability of pollutants. The factor which plays a decisive role in determining bioavailability/bioaccumulation of pollutants is sorption. Where sorption is concerned, such matrix properties as the presence, composition, properties of organic matter, type of clay materials, type and amount of other pollutants, etc. play an important role. The second part of the study is a review of the literature on the influence of hydrophobic organic pollutants with geosorbents acting through sorption. Matrix properties that can significantly influence this process have been described in detail.
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