Autor: Kiss, S A - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Influence of deuterium content of water on the growth of plant embryo and free radical producing processes
Autorzy:: Kiss, S A
Varga, I.S.
Powiązania:: https://bibliotekanauki.pl/articles/14566.pdf
Data publikacji:: 2007
Wydawca:: Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Tematy:: seedling mass
natural water
plant seed
producing process
free radical formation
plant growth
water
plant embryo
seedling length
deuterium content
Opis:: In the course of germinating plant seeds - if the deuterium (D) concentration in the germinating medium (water) is lower or higher than in natural water (150 ppm) - the length and mass of seedlings (coleoptil, epicotyl, root) proportionally decrease. The cause of the decrease owing to the changed D concentration is explained partly on energetic - partly on free radical basis and proved by measuring. In waters with lower or higher than natural D concentration the energy supply decreases while the free radical formation increases. Free radicals exert their influence by inactivating the bios substances (e.g. auxin) through oxidation. This seems to explain the mechanism of the ensuing changes.
Źródło:: Journal of Elementology; 2007, 12, 2
1644-2296
Pojawia się w:: Journal of Elementology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The role of magnesium in the supposed mechanism of anaesthesia
Autorzy:: Kiss, S.A.
Galbacs, Z.
Galbacs, G.
Powiązania:: https://bibliotekanauki.pl/articles/14886.pdf
Data publikacji:: 2006
Wydawca:: Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Tematy:: magnesium
anesthesia
fluidity
ion transport
membrane
Opis:: The anaesthetic, narcotic effect of magnesium has been discussed since the publication of Meltzer-Auger (1906), but its mechanism has not been clarified. Since then, other investigations have also been performed, but none of the publications has explained the issue. We propose a mechanism analogous to the studies made by Feinstein (1964), who examined organic compounds showing anaesthetic effects. Our view is that magnesium abridges two phospholipids of the opposite sides of the membrane through their phosphate groups. This binding results in membrane rigidity, which makes the ion permeability provided by the ion channel and/or carrier decrease or discontinue, thus the halting of the Na+, K+ and Ca2+ ion flow eventually causes an anaesthetic effect. Another possible pathway is that magnesium ions block the activity of N-methyl-D-aspartate (NMDA) receptor to control the ion channel, which also lowers the permeability of the membrane.
Źródło:: Journal of Elementology; 2006, 11, 4
1644-2296
Pojawia się w:: Journal of Elementology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: The toxic effect of aluminium and its supposable mechanism in Drosophila
Autorzy:: Kiss, A S
Kiss, I.
Csikkel-Szolnoki, A.
Powiązania:: https://bibliotekanauki.pl/articles/15648.pdf
Data publikacji:: 2007
Wydawca:: Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Tematy:: toxic effect
aluminium
magnesium
sodium
Drosophila
membrane rigidity
Drosophila melanogaster
toxicity mechanism
Opis:: During the early epoch of biological evolution, aluminium was not available for the primitive organisms because of the low solubility of aluminium compounds. This can explain why aluminium is toxic for the present-day living organisms. We studied the toxic effect of aluminium by feeding Drosophila melanogaster adults for 24 hrs. with a 1% sugar solution containing different concentrations of aluminium sulphate. The effect of magnesium chloride was also tested in combination with aluminium. After 24 hrs. we calculated the survival rate, and solubilised the flies in concentrated nitric acid in a microwave oven. The Al, Na, Mg and Zn content of the solubilised flies was measured with the ICP-AES method. We found no change in the Zn content while the Al and Mg content changed according to the treatment, and the Na content decreased significantly (20-30%) in all the cases. We suppose that the flies were mainly killed by the elevated sodium efflux resulting in a decreased intracellular pH. The cause of the elevated Na efflux could be the increased rigidity of the cell membrane caused by the aluminium. We discuss the experimental results and the supposable mechanism of toxicity.
Źródło:: Journal of Elementology; 2007, 12, 4; 281-285
1644-2296
Pojawia się w:: Journal of Elementology
Dostawca treści:: Biblioteka Nauki

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