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Resistance of heather plants (Calluna vulgaris L.) to cesium toxicity

100%

Bystrzejewska-Piotrowska G. , Drożdż A. , Stęborowski R.

2005

tom Vol. 50, nr 1

31-35

Experiments were carried out to determine uptake and distribution of 137Cs, and total isotopes of Cs and K in plants of heather (Calluna vulgaris) growing at two levels of CsCl: 0.03 and 0.3 mM. Levels of Cs and K were determined in soil and in parts of plants: roots, stem, leaves and flowers. Also calculated were: (i) transfer factor of Cs and K from soil to parts of plant and (ii) discrimination of K by Cs during the transport of Cs from roots to aboveground parts of plants, expressed as K/Cs discrimination factor. The results confirmed that heather plants are hyper-accumulators of cesium, because the accumulation of Cs in shoot was much greater than in roots. The K level in heather did not change at Cs concentrations as high as 8-fold Cs level in this plant. Heather plants seem to be relatively resistant to cesium toxicity at 0.3 mM of CsCl; the effect of exposure to CsCl at this concentration was exerted only on roots, without affecting leaves and flowers. These results supply new information on the interactions between Cs and K nutrition in plants; they also point to a possible role of heather in redistribution of the radiocesium pollution in the forest ecosystem.

ATP-sensitive Kplus transport in adrenal chromaffin granules

100%

Szewczyk A. , Lobanov N. A. , Kicinska A. , Wojcik G. , Nalecz M. J.

nr 1

In vitro effect of glutathione precursors on cytotoxicity of amino acids to human mesothelial cells

84%

Grzybowski A. E.

Journal of Physiology and Pharmacology

1999

tom 50

nr 3

Protective role of L-methionine against free radical damage of rat brain synaptosomes

67%

Slyshenkov V. S. , Shevalye A. A. , Liopo A. V. , Wojtczak L.

Acta Biochimica Polonica

2002

tom 49

nr 4

Incubation of rat brain synaptosomal/mitochondrial fraction with ieri-butyl- hydroperoxide resulted in accumulation of the lipid peroxidation product, conjugated dienes, damage of the synaptosomal membrane as evidenced by leakage of lactate dehydrogenase, and decrease of the total content of glutathione and of the GSH/GSSG ratio. This treatment also produced a considerable decrease of the ouabain-sensitive ATPase activity and a much smaller diminution of the activities of glutathione reductase and glutathione transferase. Preincubation of the synaptosomal/mitochon- drial fraction with 0.5 or 1.0 mM L-methionine significantly protected against lipid peroxidation, membrane damage and changes in the glutathione system produced by low (1 mM) concentrations of ieri-butylhydroperoxide and completely prevented inac- tivation of ouabain-sensitive ATPase, glutathione reductase and glutathione transferase by such treatment. The importance of L-methionine in antioxidant protection is discussed.