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1

Spatial variability in the activity of hydrolytic enzymes in a marine beach [Southern Baltic Sea]

100%
Mudryk Z. J., Podgorska B.
Polish Journal of Ecology
|
2005
|
tom 53
|
nr 2
Potential activity of hydrolytic microbial extracellular enzymes were determined in a sandy beach in Sopot, (Southern Baltic Sea) in July 2001. Among of the five monitored enzymes, the highest level of activity (314.28 nM MCA g⁻¹d.w. h⁻¹) was determined in the aminopeptidase whereas chitinase had the lowest level (0.50 nM MUF g⁻¹d.w. h⁻¹) of potential activity. Usually, the ranking of the activity rates of the assayed enzymes was following: aminopeptidase > lipase > β-glucosidase > α-glucosidase > chitinase. Clear gradients in the level of enzymatic activity were determined in horizontal profile of the beach. The maximum activity of studied enzymes was recorded in sand collected under seawater and at the waterline.
2
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Inhibitory effect of antibiotics on the growth of heterotrophic bacteria inhabiting marine beach

86%
Perlinski P., Mudryk Z.
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline
|
2009
|
tom 13 part II
The objective of the present study was to evaluate heterotrophic bacteria capable of growth in the presence of different antibiotics and their mixture in such dynamic ecosystem as marine beach. Mixture antibiotics had the strongest inhibitory effect on the growth of bacteria inhabiting sand of studied beach. Culturable bacteria were more resistant to ampicillin than to novobiocin and tetracycline. Inhibitory influence antibiotics on growth bacteria inhabiting studied beach were in the following order: mixture antibiotics > novobiocin > tetracycline > ampicillin.
3

Physiological properties of bacteria inhabiting polluted and unpolluted marine sandy beaches [Southern Baltic Sea]

86%
Podgorska B., Mudryk Z. J.
Polish Journal of Ecology
|
2007
|
tom 55
|
nr 1
The occurrence of bacteria displaying particular physiological properties was studied in polluted (Sopot) and unpolluted (Czołpino) marine sandy beaches (southern Baltic Sea). All eight isolated physiological groups of bacteria were much more numerous in polluted than in unpolluted beach. In polluted beach, bacteria hydrolyzing uric acid (32.5 cells 103 g–1 dry w. of sand) and ammonifying bacteria (32.3 cells 103 g–1 dry w. of sand) were the most numerous, while nitrifying bacteria were the least numerous (0.014 cells 103 g–1 dry w. of sand). In unpolluted beach, bacteria hydrolyzing uric acid (0.66 cells 103 g–1 dry w. of sand) and reducing methylene blue (0.18 cells 103 g–1 dry w. of sand) were the most numerous, while no bacteria producing hydrogen sulphide from organic compounds or bacteria decomposing urea were isolated. In both beaches, considerable differentiation in the distribution of physiological groups of bacteria was found in a horizontal profile i.e. from the waterline to the middle of beach (~60 m). Data concerning horizontal distribution of the physiological groups of bacteria in the sand of the polluted beach show that the majority of those groups was most numerous in the dune. No clear regularity in the distribution of physiological groups of bacteria was found in the horizontal profile of the unpolluted beach. Results of the present study indicate differences in the distribution of the physiological groups of bacteria in the surface (0–5 cm) and subsurface (5–10 cm) sand layers. Generally, in both studied beaches all physiological groups of bacteria were much more numerous in the surface than in the subsurface sand layer. The exception were bacteria reducing sulphates which in the polluted beach were most numerous at the depth of 5–10 cm.
4
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Antibiotic resistance of fecal coliform bacteria inhabiting sea water and sand of marine recreation beach in the southern Baltic Sea

72%
Mudryk Z. J., Perlinski P., Robak D.
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline
|
2016
|
tom 20
The results of the present study showed variability in resistance of FC bacteria isolated from beach sand and sea water against tested antibiotics. Enteric bacteria were the most resistant to clindamycin and penicillin while the most sensitive to ciprofloxacin, gentamycin, neomycin, rifampicin and streptomycin. Fecal coliform bacteria inhabiting sand were more resistant to nearly all tested antibiotics compared to bacteria isolated from sea water. The majority of bacteria inhabiting sea water and sand of the studied beach were resistant to only 1-4 antibiotics out of the 12 antibiotics tested. Fecal coliform bacteria isolated from Ustka beach were the most resistant to β-lactam and lincosamide antibiotics, while the most susceptible to aminoglycosides.
5
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Scanning electron microscopy investigation of bacterial colonization of marine beach sand grains

72%
Mudryk Z. J., Podgorska B.
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline
|
2006
|
tom 10
Scanning electron microscopy was employed for the investigation of bacteria living on sand grains in a sandy marine beach in the Gulf of Gdansk (southern Baltic Sea). Bacteria colonize the sand grains; individual topography and shape of the grains were decisive for the colonization. Grains of diverse topography characterised by a great irregularity of shape were preferred, and protected surface sites were favoured. Many of the attached bacteria were found to produce polymer secretions; entire colonies attached by means of polymer nets were observed. A significant morphological diversity of bacteria in the vertical profile of the beach was determined. Bacteria inhabiting the sand grains showed the ability to reproduces.
6

Generic composition and respiratory activity of heterotrophic bacteria of marine sandy beach [Southern Baltic Sea]

72%
Mudryk Z. J., Podgorska B.
Polish Journal of Ecology
|
2005
|
tom 53
|
nr 1
In the bacterial community occurring in a sandy marine beach (region of the Gdańsk Gulf, Southern Baltic Sea), bacteria of the genera Acinetobacter and Microoccocus predominated among 230 isolated strains. Bacteria strains of the genera Alteromonas, Bacillus, Cytophaga, Erwinia and Prostheocomicrobium contributed in a small percent. The measurements of respiratory activity revealed that casein hydrolyzate was the most actively metabolised respiratory substrate while sodium pyruvate and cellobiose were oxidised less actively. The intensity of utilization of respiratory substrates by bacteria in the whole perpendicular profile of the beach was alike. They were more intensive in the surface (0–1 cm) than in the subsurface (5–10 cm) sand layers.
7

Enzymatic activity of bacterial strains isolated from marine beach sediments

72%
Mudryk Z. J., Podgorska B.
Polish Journal of Environmental Studies
|
2006
|
tom 15
|
nr 3
Potential capability of heterotrophic bacteria for extracellular enzyme synthesis and their activity were determined in a transect from dunes to a water depth of 1 m in a sandy beach near Sopot on the southern Baltic coast. Among studied enzymes, alkaline phosphatase, esterase lipase, and leucine arylaminase were synthesized in a higher degree, whereas α-fucosidase, βglucouronidase and α-galactosidase had only low levels. No clear horizontal gradients were observed in the transect from dune to water. The enzyme activities of bacteria isolated from the surface and subsurface did not differ in their height and composition. Bacteria isolated form the sand of studied beach in different seasons, as a rule, synthesized the tested hydrolytic enzymes with similar intensity.
8

Glacier retreat and raised marine beaches at Three Sisters Point, King George Island [South Shetland Islands, West Antarctica]

72%
Birkenmajer K.
Bulletin of the Polish Academy of Sciences. Earth Sciences
|
1995
|
tom 43
|
nr 2
9

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

58%
Podgorska B., Mudryk Z. J., Skorczewski P.
Polish Journal of Ecology
|
2008
|
tom 56
|
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.
10
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Bacterial utilization of amino acids and carbohydrates in a marine beach

58%
Mudryk Z. J., Podgorska B., Dwulit M.
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline
|
2005
|
tom 09
Utilization of various amino acids and carbohydrates by heterotrophic bacteria isolated from a sandy beach in Sopot, Poland, southern Baltic Sea coast, was determined. The most intensive growth of bacteria was observed in the presence of amino acids, while carbohydrates were utilized less actively. Differences in the utilization of individual amino acids and carbohydrates by bacteria have been determined. The highest capability to assimilate amino acids and carbohydrates was observed in bacterial strains isolated from the middle part of the studied beach. No major differences were determined in the intensity of assimilation of the tested compounds by bacteria isolated from the surface and subsurface sand layers. Bacterial utilization of amino acids and carbohydrates depended on the chemical structure of those compounds.
11

Siliceous karst development in the Fontainebleau Sandstone [France]

58%
Thiry M.
Nature Conservation
|
2007
|
tom 63
77-83
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