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1
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
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Light scattering in Baltic crude oil - seawater emulsion

100%
Stelmaszewski A., Krol T., Toczek H.
Oceanologia
|
2009
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tom 51
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nr 3
405-414
The paper discusses the scattering of radiation by a Baltic crude oil –sea water emulsion. The scattering spectrum calculated using the Mie solution in the spectral range from 380 nm to 730 nm is compared with the measured spectrum of light scattered through a right angle. Spectra in the wavelength range from 210 nm to 730 nm were measured using a spectrofluorimeter for fresh and stored samples of the Baltic crude oil emulsion. Scattering increases with wavelength in the UV range and then decreases slightly with the wavelength of visible light. The result of the calculation is similar to the measured spectra. Both the calculated and measured spectra display numerous relative extremes throughout the spectral area. Light scattering in the emulsion decreases during storage as the oil concentration in the medium diminishes. The results also demonstrate that the single scattering model describes the phenomenon correctly.
2

Insight into the kinetics and the mode of the interaction between smooth muscle calponin and F-actin

100%
Kolakowski J., Dabrowska R.
Acta Biochimica Polonica
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2002
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tom 49
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nr 2
Kinetics of the smooth muscle calponin-F-actin interaction was studied by stopped- flow measurements of light scattering and fluorescence intensity of pyrene-labelled F-actin. The intensity and character of the changes in light scattering, and thus the mode of calponin binding to actin filaments leading to changes in their shape and bun­dling, depend on the molar ratio of the two proteins. Parallel measurements of pyrene-fluorescence quenching upon calponin binding revealed that intrinsic conformational changes in actin filaments are delayed relative to the binding process and are not markedly influenced by the mode of calponin binding. Bundling of actin filaments by calponin was not correlated with fluorescence changes and thus with al­terations in the structure of actin filaments.
3

Modelling of the crude oil suspension impact on inherent optical parameters of coastal seawater

100%
Otremba Z., Krol T.
Polish Journal of Environmental Studies
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2002
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tom 11
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nr 4
This paper presents the results of modeling of spectra of light scattering and absorption coefficients in sea water polluted with crude oil suspension. In the Mie theory, which has been applied for calculations, the results of the measurements of the size distribution spectra in artificial crude oil suspensions in sea water were used as well as the results of the measurements of the components of the complex light refraction index of crude oil from the Baltic Sea (Petrobaltic type). The comparison of the spectra obtained with those which are characteristic for the waters in the Gulf of Gda.sk confirmed that the admixture of emulsion with about 2 ppm of crude oil doubles the light scattering coefficient. The same effect, with respect to the light absorption coefficient, is obtained when the concentration of the crude oil suspension is about 100 ppm.
4

Advanced methods in photobiology of protists

84%
Hader D.-P.
Acta Protozoologica
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1991
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tom 30
|
nr 3-4
5

Light scattering in crude oil—sea water colloidal systems

84%
Mrozek-Lejman J., Zielinski A., Krol T., Witkowski K.
Oceanologia
|
1985
|
tom 22
6
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
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Variability in the optical properties of a crude oil - seawater emulsion

84%
Krol T., Stelmaszewski A., Freda W.
Oceanologia
|
2006
|
tom 48
|
nr S
The paper analyses the optical properties of a crude oil –sea water emulsion, which is a form of petroleum pollution of the sea. These properties depend on the spillage concentration, the optical characteristics of the seawater and oil in question, and on the size distribution of the oil droplets. They may be described by the attenuation specific cross-sections and absorption specific cross-sections. Specific cross-sections and other optical parameters for droplets of a Baltic crude oil –Bal tic seawater emulsion were calculated using Mie’s solution. These characteristics were computed for fresh and weathered petroleum.
7
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Inherent optical properties and remote sensing reflectance of Pomeranian lakes (Poland)

67%
Ficek D., Meler J., Zapadka T., Wozniak B., Dera J.
Oceanologia
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2012
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tom 54
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nr 4
8
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
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The contribution of fluorescence to measurements of light scattering in oil-in-water emulsions

67%
Stelmaszewski A.
Oceanologia
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2011
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tom 53
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nr 2
The paper presents some results of research on the fluorescence properties of petroleum oil-in-water emulsions. The research addresses the question of measuring and modelling light fields in an oil-polluted marine environment. The fluorescence of the emulsion manifests itself in the spectral range from 260 to over 400 nm and is much less intensive in the visible light region. Fluorescence is always weaker than the radiation scattered in an emulsion. The measurement and modelling of ultraviolet radiation scattering requires fluorescence to be taken into consideration, but in the visible spectral region this phenomenon is negligible.
9

The light scattering matrix of Chlorella vulgaris cells and its variability due to cell modification

67%
Witkowski K., Krol T., Lotocka M.
Oceanologia
|
1994
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tom 36
|
nr 1
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