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1

Rozmieszczenie, zrodla i drogi przenoszenia niepodstawionych weglowodorow aromatycznych [WWA] w srodowisku Baltyku Poludniowego

100%
Kowalewska G.
Działalność Naukowa PAN. Wybrane Zagadnienia
|
1998
|
tom 05
156
2

Radium-226 in water and sediments of the Southern Baltic Sea

100%
Kowalewska G.
Oceanologia
|
1986
|
tom 23
3

Toksyczne działanie miedzi na fitoplankton w środowisku morskim

100%
Kowalewska G.
Wiadomości Botaniczne
|
1988
|
tom 32
|
nr 1
4

Occurrence of chlorins in recent sediments of the southern Baltic sea

100%
Kowalewska G.
Polskie Archiwum Hydrobiologii
|
1994
|
tom 41
|
nr 2
237-249
5

Phytoplankton blooms - a fever of the Baltic ecosystem

100%
Kowalewska G.
Oceanologia
|
1999
|
tom 41
|
nr 2
6

Metalloporphyrins in recent sediments of the Baltic Sea

100%
Kowalewska G.
Oceanologia
|
1995
|
tom 37
|
nr 1
7

Copper chlorins in the water and sediments of the Baltic Sea

100%
Kowalewska G.
Oceanologia
|
1992
|
tom 33
8

Chlorophyll a and its derivatives in recent sediments of the southern Baltic Sea collected in the years 1992-1996

100%
Kowalewska G.
Oceanologia
|
1997
|
tom 39
|
nr 4
9

Is the pollution of the Baltic Sea increasing?

100%
Kowalewska G.
Oceanological Studies
|
2000
|
tom 29
|
nr 1
10

Suspended PM10 particles in an urbanized coastal zone (Tricity, Agglomeration, Poland) - a possible source of PAHs gulf of Gdansk sediments

63%
Lubecki L., Kowalewska G.
Polish Journal of Environmental Studies
|
2012
|
tom 21
|
nr 3
Polycyclic aromatic hydrocarbons (PAHs) were determined by GC/MS in suspended airborne PM]0 particles collected at 4 sites in the Tricity agglomeration of northern Poland. This industrialized and densely populated area with distinctly seasonally variable weather conditions is located on the southern Baltic Sea coast. Daily concentrations of Ʃ12PAHs ranged from ~0.04 to ~60 ng/m³ in the samples analyzed. The levels of particulate PAHs showed distinct seasonal changes throughout the year, with higher concentrations in the heating season. The elevated PAH concentrations recorded during the heating season were most probably due to greater emissions of PAHs from heating systems, as well as meteorological factors that restrict the dispersion of these pollutants in the atmosphere and enhance their persistence. Benzo(a)pyrene was confirmed as being a good marker of total PAHs associated with PMI0 particles, and concentrations of this compound during the heating season often exceeded 1 ng/m³ - the threshold established in Directive 2004/107/EC. Mass concentrations of PM₁₀ particulate matter were not strongly correlated with PAH concentrations. Meteorological factors like temperature and wind speed strongly influence the distribution of particulate PAHs in the study area, but the former parameter is clearly linked to seasonal emission patterns. It has been found that atmospheric input is an important source of PAHs deposited in recent Gulf of Gdańsk sediments.
11
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Content available

Distribution and fate of polycyclic aromatic hydrocarbons (PAHs) in recent sediments from the Gulf of Gdańsk (SE Baltic)

63%
Lubecki L., Kowalewska G.
Oceanologia
|
2010
|
tom 52
|
nr 4
12

Copper complexes with the porphyrin ring of chlorophyll in phytoplankton cells

63%
Kowalewska G., Lotocka M.
Acta Ichthyologica et Piscatoria. Supplementum
|
1991
|
tom 21
13
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Influence of selected abiotic factors on the decomposition of chlorophylls

63%
Kowalewska G., Szymczak M.
Oceanologia
|
2001
|
tom 43
|
nr 3
315-328
The paper presents the results of experiments to determine the influence of selected physico-chemical factors – oxygen, visible light and temperature – on the decomposition of (1) chlorophylls a, b and c, chlorophyll a derivatives and β-carotene in acetone solution, and (2) chlorophyll a and β-carotene in axenic cultures of the blue-green algae Anabaena variabilis. The results indicate that both in acetone extracts and in blue-green algae cultures these pigments were most sensitive to light and oxygen; temperatures of up to 25◦C had no marked influence on these compounds. Under anoxia in acetone solution, the stability towards light decreased in the order chlorophyll a, chlorophyll b, chlorophylls c. Chlorophyll a, moreover, was less stable than its derivatives – phaeophorbides, phaeophytins, pyrophaeophytins and steryl chlorins – but more stable than β-carotene, in the last case also in the blue-green algae cultures. Decomposition of all the pigments proceeded mainly via the breakdown of the porphyrin macrocycle, since the decomposition products were not detected in the VIS range. On the basis of these experiments one can state that while light and oxygen may have a decisive direct influence on the distribution of chlorophylls and β-carotene in sediments, in the natural environment, temperatures of up to 25◦ C may have very little immediate effect.
14

Identificatin of the copper porphyrin complex formed in cultures of blue-green alga Anabaena variabilis

63%
Kowalewska G., Hoffmann S. K.
Acta Physiologiae Plantarum
|
1989
|
tom 11
|
nr 1
15
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Factors influencing the tendency of young people to migrate abroad – an example from Northern Poland

63%
Kowalewska G., Zabielska I. I.
Economic and Regional Studies
|
2023
|
tom 16
|
nr 4
16
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

PCBs in phytoplankton in the Odra Estuary

63%
Konat-Stepowicz J., Kowalewska G.
Oceanologia
|
2003
|
tom 45
|
nr 3
Eleven PCB congeners were determined in phytoplankton samples collected from the Odra Estuary at 9 stations in 2001–2002. The PCB concentrations were related to the temperature, turbidity, salinity, oxygen and redox potential of the water as well as to the pigment content in the samples. The results indicate that phytoplankton and the detritus derived from it play a crucial role in the distribution of PCBs, their transfer from the water column to sediments and from the Estuary to the sea. The species composition of the phytoplankton occurring in this area could also be very important as regards the sorption of PCBs.
17

The role of phytoplankton in the transport and distribution of polynuclear aromatic hydrocarbons [PAHs] in the southern Baltic environment

63%
Kowalewska G., Konat J.
Oceanologia
|
1997
|
tom 39
|
nr 3
18

Distribution of polynuclear aromatic hydrocarbons [PAHs] in sediments of the southern Baltic Sea

63%
Kowalewska G., Konat J.
Oceanologia
|
1997
|
tom 39
|
nr 1
19

Verdet constant polarimetric measurement in aqueous solutions of salts

51%
Heldt J., Szczepanski J., Kowalewska G., Zielinski A.
Oceanologia
|
1985
|
tom 20
20

On the possibility of application of a polarimetric method for determination of salinity in sea-water

51%
Zielinski A., Kowalewska G., Heldt J., Szczepanski J.
Oceanologia
|
1986
|
tom 23
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