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, A. J. (2003): Role of reactive oxygen species in the response of barley to necrotrophic pathogens. Protoplasma 221 , 137-143. Role of reactive oxygen species in the response of barley to necrotrophic pathogens

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19 Király, Z., El-Zahaby, H. M. and Klement, Z.(1997): Role of extracellular polysaccharide (EPS) slime of plant pathogenic bacteria in protecting cells to reactive oxygen species. Journal

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Acta Physiologica Hungarica
Authors: Simona Clichici, A. Filip, D. Daicoviciu, R. Ion, T. Mocan, C. Tatomir, L. Rogojan, D. Olteanu and A. Muresan

2666 Kolarova H, Bajgar R, Tomankova K, Nevrelova P, Mosinger J: Comparison of sensitizers by detecting reactive oxygen species after photodynamic reaction in vitro . Toxicol. In Vitro 21

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611 Apel, K. and Hirt, H. (2004): Reactive oxygen species: metabolism, oxidative stress and signal transduction. Annu. Rev. Plant Biol. 55, 373

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Allan, A. C., Fluhr, R. (1997) Two sources of elicited reactive oxygen species in tobacco epidermal cells. Plant Cell 9 , 1559–1572. Fluhr R

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It is by now accepted that extremely low frequency electromagnetic fields ELF-EMF (0–300 Hz) affect biological systems although the mechanism has not been elucidated yet. In this study the effect of ELFEMF on the number of apoptotic cells of K562 human leukemia cell line induced or not with oxidative stress and the correlation with heat-shock protein 70 (hsp70) levels was investigated. One sample was treated with H 2 O 2 while the other was left untreated. ELF-EMF (1 mT, 50 Hz) was applied for 3 hours. ELF-EMF alone caused a decrease in the number of apoptotic cells and a slight increase in viability. However, it increased the number of apoptotic cells. In cells treated with H 2 O 2 . hsp70 and reactive oxygen species (ROS) levels were increased by ELF-EMF. These results show that the effect of ELF-EMF on biological systems depends on the status of the cell: while in cells not exposed to oxidative stress it is able to decrease the number of apoptotic cells by inducing an increase in hsp levels, it increases the number of apoptotic cells in oxidative stress-induced cells.

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Sagi, M., Fluhr, R. (2006) Production of reactive oxygen species by plant NADPH oxidases. Plant Physiol. 141 , 336–340. Fluhr R. Production of reactive oxygen species by plant

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Orvosi Hetilap
Authors: Iván Horváth, Bálint Kittka, Ábel Perjés, Heikki Ruskoaho and István Szokodi

Heinzel, F. R., Luo, Y., Dodoni, G., et al.: Formation of reactive oxygen species at increased contraction frequency in rat cardiomyocytes. Cardiovasc. Res., 2006, 71 (2), 374

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Mol. Plant Pathol 2010 11 563 576 Apel, K. and Hirt, H. (2004): Reactive oxygen species

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248 254 Cocco, T., Di Paola, M., Papa, S. and Lorusso, M. (1999): Arachidonic acid interaction with the mitochondrial electron transport chain promotes reactive oxygen species

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