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1
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
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Bacterial utilization of carbohydrates in the surface seawater layers of the Gdansk Deep

100%
Mudryk Z., Skorczewski P.
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline
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1997
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tom 01
2
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Physiological properties of bacteria inhabiting coastal lake surface and subsurface water layers

100%
Skorczewski P., Mudryk Z. J.
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline
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2005
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tom 09
Results of the studies on the occurrence of bacteria displaying particular physiological properties in coastal Lake Gardno are presented. Most numerous groups among neustonic and planktonic bacteria studied were ammonifying and producing hydrogen sulphide from organic compounds strains. Nitrifying bacteria were not numerous among isolated strains. It was demonstrated that significant differences in the abundance of individual physiological groups bacteria existed in water layers, stations and seasons.
3

Different antibiotic resistance of neustonic and planktonic bacteria in a freshwater coastal lake: implication for strain selection

100%
Skorczewski P., Mudryk Z. J.
Polish Journal of Ecology
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2012
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tom 60
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nr 1
Antibiotic resistance of bacteria was observed in various aquatic environments including seas, rivers, lakes, coastal areas, surface water and sediments. The increased implementation of antibiotics into these environments through medical therapy, agriculture and animal husbandry has resulted in new selective pressures on natural bacterial aquatic populations. Antibiotic resistance of heterotrophic bacteria isolated from the surface microlayer and subsurface water of freshwater coastal polymictic and low-productive lake was studied. Antibiotic resistance was determined by the single disc diffusion method. The resistance level of bacteria to various antibiotics differed considerably. Bacteria were most resistant to ampicillin, ciprofloxacin, clindamycin, erythromycin and penicillin. Majority of bacterial strains showed resistance to 4–6 out of 18 antibiotics tested. As a rule, neustonic bacteria (antibiotic resistance index, ARI 0.44) were more resistant to the studied antibiotics than planktonic bacteria (ARI 0.32). 70–90% of neustonic bacteria were resistant to ampicillin, clindamycin and erythromycin, 60– 70% of planktonic bacteria were resistant to ampicillin, ciprofloxacin and penicillin. Differences between pigmented and non-pigmented bacteria in their resistance to the tested antibiotics were observed. Above 40% of achromogenic bacterial strains were resistant to ampicillin, clindamycin and penicillin. Among bacterial strains characterised by their ability to synthesize carotenoids, more than 30% was resistant to ampicillin and ciprofloxacin. Bacterial resistance level to antibiotics depended on their chemical structure. Bacteria isolated from study lake were most resistant to quinolones and lincosamides while they were most susceptible to tetracyclines and aminoglycosides. Results presented in this paper indicate that antibiotics are a significant selection factor and probably play an important role in regulating the composition of bacterial communities in aquatic ecosystems. Adaptive responses of bacterial communities to several antibiotics observed in the present study may have possible implications for the public health.
4
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Frequency of antibiotic resistance in bacteria inhabiting water of downtown pond

100%
Mudryk Z., Skorczewski P.
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline
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2009
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tom 13 part I
Antibiotic resistance of heterotrophic bacteria isolated from the surface microlayer and subsurface water of downtown pond was determined. The levels of resistance of bacteria to various antibiotics differed considerably. It follows from the results that bacteria were most resistant to penicillin and sensitive to gentamycin, neomycin and oxytetracycline. Majority of bacterial strains were characterised by resistance to 6-8 of 18 antibiotics tested. As a rule, there were no significant differences in antibiotic resistance between neustonic and planktonic bacteria. Pigmented bacteria were more antibiotic resistant than non-pigmented ones.
5
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Abundance and productivity of estuarine neustonic and planktonic bacteria

100%
Mudryk Z., Skorczewski P.
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline
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2007
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tom 11
The paper presents the results of the study of abundance and secondary production of neustonic and planktonic bacteria inhabiting estuarine Lake Gardno. The obtained data indicate that numbers of bacterioneuston were only slightly higher than of bacterioplankton. The rate of secondary production of bacteria was higher in the film layer than in the surface layer and subsurface water. Bacterial abundance and production were changing with seasons. Differences among studied bacteriological parameters were determined among sites across Lake Gardno.
6

Respiratory activity of neustonic and planktonic bacteria isolated from coastal Lake Gardno

100%
Skorczewski P., Mudryk Z.
Polish Journal of Natural Sciences
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2008
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tom 23
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nr 2
387-397
Respiratory activity of heterotrophic bacterioneuston and bacterioplankton isolated from coastal Lake Gardno was determined. Neustonic and planktonic bacteria oxidized tested organic compounds with various intensity. Casein hydrolyzate was the most actively metabolized respiratory substrate while cellobiose was oxidised least actively. In the presence of all tested substrates, respiratory processes bacterial strains isolated from surface water were more intensive than bacterial strains inhabited subsurface water layer. The level of metabolic activity of bacteria from different parts of the studied lake was shown to differ.
7

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

100%
Skorczewski P., Mudryk Z.
Oceanological and Hydrobiological Studies
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2009
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tom 38
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nr 4
89-101
8

Culturable proteolytic bacteria and the activity of leucine aminopeptidase in river ecosystem

100%
Skorczewski P., Mudryk Z. J.
Polish Journal of Ecology
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2009
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tom 57
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nr 3
561-565
The study determined the numbers and distribution of culturable heterotrophic and proteolytic bacteria and the level of leucine aminopeptidase activity in the water of the Słupia River within the town of Słupsk (Northern Poland). River Słupia is 138.6 km long and flowing into the Baltic Sea. The average water discharge of the river is 15.5 m³ s⁻¹ and its slope is about 1.3% which gives it a mountainous character. The numbers of culturable heterotrophic bacteria was determined on iron-peptone agar (IPA) medium and the numbers of culturable proteolytic bacteria was assayed in IPA medium enriched with gelatin. Potential leucine aminopeptidase activity was carried out with the use of fluorescently labelled model substrate MCA-leucine. The numbers of heterotrophic bacteria ranged between 0.33 to 183.0  10³ cells cm⁻³ (maximum in spring, minimum in winter); the abundance of culturable proteolytic bacteria ranged 0.50 to 31.8  10³ cells cm⁻³ and the maximum was noted in spring, the lowest in summer. The activity of extracellular leucine aminopeptidase ranged from 2.34 to 6.87 μM MCA dm⁻³ h⁻¹ and the highest value was noted in spring while the lowest were noted in winter and summer. The values of bacteriological parameters and of leucine aminopepidase activity tended to be higher below the sewage treatment plant. The bacteriological parameters for River Słupia were compared with the relevant data for other river ecosystems.
9

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
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2006
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tom 54
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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.
10

Antibiotic resistance in marine neustonic and planktonic bacteria isolated from the Gdansk Deep

100%
Mudryk Z., Skorczewski P.
Oceanologia
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1998
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tom 40
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nr 2
11

Utilization of dissolved amino acids by marine bacteria isolated from the surface and subsurface layers of the Gdansk Deep

100%
Mudryk Z., Skorczewski P.
Polish Journal of Environmental Studies
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1998
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tom 07
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nr 5
12

Abundance and production of bacteria in a marine beach [Southern Baltic Sea]

81%
Podgorska B., Mudryk Z. J., Skorczewski P.
Polish Journal of Ecology
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2008
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tom 56
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nr 3
405-414
The paper presents the results of the study of abundance, biomass, mean cell volume and secondary production of bacteria inhabiting a marine-bay sandy beach, at southern Baltic Sea coast (Sopot) in summer season. The differences of bacteriological parameters among sites across beach horizontal profile were determined. Maximal value of the total bacteria numbers (8.59 ± 0.73 × 10⁷ cells g⁻¹ dw), biomass (15.2 ± 4.4 μg C g⁻¹ dw) and cell volume of bacterium (0.056 ± 0.011 μm³) was noted at the waterline and bacterial secondary production was highest in the dune (172.3 ± 86.6 μg C g⁻¹ dw d⁻¹) and at the waterline (119.9 ± 40.5 μg C g ⁻¹ dw d⁻¹). Marked differences in the level of bacteriological parameters between surface and subsurface sand layers were estimated. In the sea, at the waterline and in the middle of the beach higher numbers of bacteria, their biomass and secondary production were found in the surface (0–1 cm) than in the subsurface (5–10 cm) sand layers. A reverse situation was observed in the dune.
13

Participation of MEM plus bacteria in the bacterioplankton community in Ustka harbor, the River Slupia estuary, Southern Baltic Sea

81%
Perlinski P., Skorczewski P., Zdanowicz M., Mudryk Z.
European Journal of Biological Research
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2015
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tom 05
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nr 2
14

Studies concerning heterotrophic bacteria decomposing macromolecular compounds at two marine beaches

81%
Mudryk Z., Skorczewski P., Perlinski P., Wielgat M.
Oceanological and Hydrobiological Studies
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2011
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tom 40
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nr 3
15
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
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Utilization of low molecular weight organic compounds by bacterioneuston and bacterioplankton isolated from coastal Lake Dolgie Wielkie

81%
Dwulit M., Mudryk Z., Skorczewski P.
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline
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2007
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tom 11
Utilization of various amino acids and carbohydrates by neustonic and planktonic bacteria isolated from coastal Lake Dołgie Wielkie was determined. The highest percentage of the bacteria inhabiting this lake used proline and glutamine. Considerably higher percentage of neustonic bacteria (FL, SL) than planktonic (SUB) bacteria in their metabolic processes prefered the tested amino acids. The highest percentage of isolated bacteria utilized fructose and glucose. The majority of tested carbohydrates actively used neustonic bacteria isolated from surface layer (SL) than film layer (FL) and subsurface layer (SUB). There were no major differences in the intensity of assimilation of amino acids and carbohydrates between bacteria inhabiting particular parts of Lake Dołgie Wielkie.
16

Aromatic hydrocarbon decomposition by neustonic bacteria. Part I. Single-ring hydrocarbon biodegradation

81%
Walczak M., Donderski W., Mudryk Z., Skorczewski P.
Polish Journal of Environmental Studies
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2000
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tom 09
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nr 6
471-474
The present paper provides an account of a study on benzene, toluene and xylene degradation by neustonic and planktonic bacteria in lake Jeziorak Mary. Aromatic hydrocarbons were better decomposed by neustonic bacteria than planktonic bacteria. Moreover, the obtained data point to the total number of bacteria and heterotrophic bacteria number being greater in surface microlayer than in subsurface water.
17
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

The influence of heavy metal ions on neustonic bacteria

81%
Donderski W., Walczak M., Mudryk Z., Skorczewski P.
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline
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1999
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tom 03
18
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
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Optimization of measurement enzyme activity using fluorogenic substrates in water

81%
Skorczewski P., Mudryk Z., Kulinski B.
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline
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1999
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tom 03
19

Aromatic hydrocarbons decomposition by neustonic bacteria. Part II - Policyclic aromatic hydrocarbons biodegradation

81%
Walczak M., Donderski W., Mudryk Z., Skorczewski P.
Polish Journal of Environmental Studies
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2001
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tom 10
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nr 1
The present paper provides results of a study on heterotrophic bacteria occurrence and quantity in the biofilm and subsurface water of lake Jeziorak Maty. Degradation of several polycyclic aromatic hydrocarbons (PAH's) (anthracene, naphthalene) by neustonic and planktonic bacteria have been examined. It has been discovered that some aromatic hydrocarbons were better decomposed by neustonic bacteria than by planktonic ones. Both Total Number of bacteria (TN) and heterotrophic bacteria number (TVC) were higher in the surface microlayer than in the subsurface water.
20

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

81%
Mudryk Z., Donderski W., Skorczewski P., Walczak M.
Oceanological Studies
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2000
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tom 29
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nr 1
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