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Effect of Laser Radiation on Free Radicals in Human Cancer G361 Cells

100%
Latocha M., Pilawa B., Zdybel M., Wilczok T.
Acta Physica Polonica A
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2005
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vol. 108
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issue 2
409-412
EN
EPR spectroscopy was used to the examination of free radicals evolution in cancer G361 cells during photodynamic therapy. The cancer cells were cultured with photosensitizer ALA and irradiated with 635 nm light by laser. The number of cells was determined microscopically. The decrease in the cell number and the increase in free radicals, obtained for G361 cells cultured with ALA and irradiated with laser, were stronger than relevant changes for the cells which were only irradiated with laser. The studied melanotic cells susceptible for photodynamic therapy differ from the other melanotic SK human cancer cells by fast spin-lattice relaxation processes. Slow spin-lattice relaxation processes exist in the studied earlier non susceptible for photodynamic therapy SK cells.
2
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Effect of pH on Paramagnetic Centers in Cladosporium cladosporioides Melanin

76%
Pilawa B., Buszman E., Gondzik A., Wilczyński S., Zdybel M., Witoszyńska T., Wilczok T.
Acta Physica Polonica A
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2005
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vol. 108
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issue 1
147-150
EN
Paramagnetic centers in melanin existing in pigmented soil fungi Cladosporium cladosporioides cultured at acidic (4, 5, 6), neutral (7), and alkaline (8) pH were studied by EPR method. o-semiquinone free radicals (g: 2.0032-2.0040) concentration in melanin biopolymer increased for pH from 4 to 6, decreased at pH 7, and reached the maximum value at pH 8. It may be expected that melanin free radicals reactions with small molecules (metal ions, drugs) are the most effective at pH between 6 and 8. Slow spin-lattice relaxation processes exist in the all studied melanin samples.
3
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Paramagnetic Centers in DOPA-Melanin-Dihydrostreptomycin Complexes

76%
Buszman E., Pilawa B., Zdybel M., Wrześniok D., Grzegorczyk A., Wilczok T.
Acta Physica Polonica A
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2005
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vol. 108
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issue 2
353-356
EN
DOPA-melanin-dihydrostreptomycin complexes with drug concentrations 1×10^{-4}-1×10^{-2} M were examined by the use of electron paramagnetic resonance spectroscopy at X-band (9.3 GHz). Dihydrostreptomycin was chosen for studies, because this aminoglycoside antibiotic causes strong toxic effects in organism. It was stated that dihydrostreptomycin generates o-semiquinone free radicals with g=2.0038 in melanin. Free radicals formation increases with increase in the antibiotic concentration. Changes of EPR lines with microwave powers pointed out that slow spin-lattice relaxation processes exist in DOPA-melanin and in its complexes with dihydrostreptomycin. The measured EPR lines were homogeneously broadened.
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