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1

Microbiological transformation of organic matter in estuarine basins of the Polish coast.III.Activity of proteases, amylases and lipases synthetized by bacteria isolated from maritime lakes

100%
Mudryk Z.
Oceanological Studies
|
1995
|
issue 69/10
33-44
EN
This paper presents the results of investigatoins on activity of proteases, amylases and lipases synthetized by estuarine bacteria.The highest lavels of activitry of the enzymes studied were observed in bacteria from hypertrophic lake Jamno, the lowast in bacteria from eutrophic lake Lebsko.The activity of the enzymes displayed substantial seasonal fluctuations.The marked impact of pH and salinity on the level of the enzymatic activities was also noticed.
2

Generic composition and metabolic activity of bacteria inhabiting surface seawater layers

100%
Mudryk Z.
Oceanological Studies
|
1998
|
vol. 27
|
issue 3
43-55
EN
Generic composition and metabolic activity of neustonic and planktonic bacteria inhabiting seawater in the region of the Gdansk Deep were determined. In each of the studied water layers, bacteria of the Flavobacterium-Cytophaga group domi-nated, while bacteria of the Micrococcus, Acineto-bacter, Bacillus genera and of the Arthrobacter-Corynebacterium group constituted only a slight percentage of the bacterioneuston and bakterioplankton. Different levels of metabolic activity of bacteria inhabiting different water layers were measured. The intensity of oxidization of respiratory substrates depended also on taxonomic position of bacteria. Generally casein hydrolyzate was the most actively metabolized respiratory substrate; sodium acetate was oxidized with lesser intensity. A considerable impact of salinity on the level of metabolic activity was noticed.
3

Activity of heterotrophic bacterai isolated from the surface microlayer and subsurface water in the Southern Baltic

63%
Mudryk Z., Korzeniewski K.
Oceanological Studies
|
1995
|
issue 69/10
45-57
EN
The abundance of heterotrophic bacteria in the surface microlayer and subsurface water as well as the rates of processes of organic matter decomposition by multi-species populations of bacterioneuston and bacterioplankton of the Southern Baltic have been determined.The number of heterotrophic bacteria in the surface microlayers was found to be 2 to 11 times greater than in the surface water.The significant differences in the rate of bacterial destruction of individual organic compounds have been shown.It has been also found out that simple organic compounds were mineralized more actively by bacterioneuston while macromolecules by planktonic bacteria.
4

Microbiological transformation of organic matter in estuarine basins of the Polish coast.II.Physiological properties of estuarine bacteria and their involvement in processes of macromolecule degradation

63%
Mudryk Z., Donderski W.
Oceanological Studies
|
1995
|
issue 69/10
17-31
EN
It was demonstrated that significant differences in the abundance of individual physiological groups of bacteria existed among the lakes studied, sampling sites, as well as seasons.Ammonifying, denitrifying and glucose acidifying bacteria constituted the most abundant groups of planktonic and benthic organisms.Bacteria producing hydrogen sulfide and reducing sulfates were rather infrequent.In the case of both water and sediments, microflora of three lakes studied exibited very similar potential ability to carry out the processes of macromolecule degradation.Among bacterai isolated from the two zones, the most abundant were strains hydrolizing proteins, lipids and starch.Only small percentage of strains carried out depolymerization of cellulose.
5

Distribution and activity of proteolytic bacteria in the surface and subsurface water layers in the region of the Gdansk Deep

63%
Mudryk Z., Donderski W.
Oceanological Studies
|
1996
|
vol. 25
|
issue 4
3-17
EN
The abundance and proteolytic activity of bacteria inhabiting the surface microlayers and subsurface water in the region of the Gda?sk Deep have been determined. Proteolytic bacteria occurred in large numbers, making up 60-100% of the total number of strains in the water layers investigated. Bacteria inhabiting the subsurface water layer displayed the highest mean activity of enzymes catalysing protein decomposition processes. The considerable impact of temperature, pH and salinity on protease activity was noted.
6

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

63%
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.
7

Effect of some heavy metals on neustonic and planktonic bacteria isolated from the Deep of Gdansk

39%
Mudryk Z., Donderski D. W., Donderski W., Skorczewski S. P., Skorczewski P., Walczak W. M., Walczak M.
Oceanological Studies
|
2000
|
vol. 29
|
issue 1
89-99
EN
The effect of different concentrations of heavy metal ions Hg+2, Cd+2, Zn+2, Cu+2 on growth and respiratory activity of neustonic and planktonic bacteria derived from the Deep of Gda?sk was studied. The laboratory experiments demonstrated that all heavy metals examined exhibited toxic effects on the development and oxygen uptake by neustonic and planktonic bacteria. This effect depended on the kind of the metal and its concentration.
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