Wyniki wyszukiwania

1

The cellular response of human colon and lung cancer cells to treatment with unsymmetrical bisacridine derivatives

100%

Gospodarek M., Pawlowska M., Augustin E.

Acta Biochimica Polonica

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2018

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tom 65

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nr S2

2

Adaptation of the photosynthetic apparatus of Nitellopsis obtusa to changing light intensity at the molecular level: different pathways of a singlet excitation quenching

100%

Gruszecki W. I., Gospodarek M., Jaskowska A., Spiewla E.

Acta Physiologiae Plantarum

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2006

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tom 28

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nr 2

The effect of pro longed illumination (60 min) with photosynthetically active monochromatic radiation of low intensity (3 μmol-m⁻² ·s⁻¹) and high intensity (60 mmol m⁻² ·s⁻¹), corresponding to the physiological conditions and light stress conditions, respectively, was studied in the algae Nitellopsis obtusa. Illumination of Nitellopsis obtusa cells with strong light was associated with activation of the xanthophyll cycle, manifested by the deepoxidation of violaxanthin and accumulation of antheraxanthin and zeaxanthin. At the same time, the efficient singlet excitation quenching in the photosynthetic apparatus was activated, as demonstrated by the decrease in the intensity of the chlorophyll a fluorescence emission by ca 50 %. The difference of the fluorescence excitation spectra recorded before and after the light treatment match the difference absorption spectrum of the xanthophyll cycle pigments. The illumination with low light intensity resulted also in the chlorophyll a fluorescence quenching but the effect was very small (less than 10 %). The fluorescence quenching is interpreted in terms of the energy transfer between the Qy energy level of chlorophyll a and the 2¹Ag⁻ energy level of zeaxanthin. The singlet energy levels of carotenoids, corresponding to the green spectral region, are also taken into consideration in the interpretation of the excitation energy exchange between the carotenoids and chlorophylls. Possible molecular mechanisms involved in the activation of the strong and the weak excitation quenching, including violaxanthin isomerization, and possible physiological functions of such pathways of energy transfer are discussed.

3

Changes in the long-lasting delaved luminescence from Nitellopsis obtusa cells, as induced by biologically active substances

88%

Jaskowska A., Borc R., Dudziak A., Gospodarek M., Zolnierczuk R.

Cellular and Molecular Biology Letters

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2002

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tom 07

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nr Suppl.

4

Changes in physical properties of the bisphosphonate-enriched bone cement

76%

Olchowik G., Matuszewski L., Zdrojewska A., Mazurkiewicz T., Gospodarek M., Kowalczyk B.

Current Topics in Biophysics. Supplement

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2013

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tom 36

|

nr 2A: Posters

5

Evaluation of the physical properties of the animal bones affected by lead

76%

Olchowik G., Gospodarek M., Tomaszewski M., Widomska J., Tomaszewska M., Jagiello-Wojtowicz E.

Current Topics in Biophysics. Supplement

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2013

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tom 36

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nr 2A: Posters

6

Changes of electrical and luminescent parameters in Characae cells when local anesthetics affect their metabolic state

76%

Jaskowska A., Gorski Z., Dudziak A., Borc R., Gospodarek M., Spiewla E.

Acta Biochimica Polonica

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2003

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tom 50

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nr Supplement 1

7

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The influence of lead on the biomechanical properties of bone tissue in rats

76%

Olchowiak G., Widomska J., Tomaszewski M., Gospodarek M., Tomaszewska M., Jagiello-Wojtowicz E.

Annals of Agricultural and Environmental Medicine

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2014

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tom 21

|

nr 2

8

Light-induced isomerization of neoxanthin in LHCII

64%

Zubik M., Luchowski R., Grudzinski W., Gospodarek M., Gryczynski I., Gryczynski Z., Dobrucki J. W., Gruszecki W. I.

Acta Biologica Cracoviensia. Series Botanica. Supplement

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2011

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tom 53

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nr 1

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