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The saline area of the Kiskunság region of Hungary has varied micro-topographic conditions with different plant communities. This study was performed in a dry sandy grassland community ( Potentillo arenariae-Festucetum pseudovinae Soó (1938) 1940) and a neighbouring saline sandy grassland community ( Lepidio crassifolii-Puccinellietum limosae Soó (1947) 1957). These are located at different elevations and have completely different floristic composition and physiognomy due to the soil characteristics and water availability. We assessed how the different environmental conditions during summer period might alter some physiological traits of two dominant xerophytes of sandy grassland ( Achillea collina L., Festuca pseudovina Hack. ex Wiesb.) and two halophytes of saline grassland ( Lepidium crassifolium (W. et K.), Puccinellia limosa (Schur) Holmbg.). The relationship between soil water potential and water content showed lower water availability for plants in the saline habitat as the high water soluble sodium content (900–2000 ppm) of this soil type limits water absorption. Both halophyte species in this study exhibited lower K/Na ratio than xerophyte species. Between the two halophytes L. crassifolium can be described as a “leaf/shoot sodium accumulator” species while P. limosa as a “leaf sodium avoider” species. The four species differed in proline accumulation. The salt adapted species had multifold accumulation of proline as compared to species of dry sandy grassland. The three microhabitats differing in total plant cover offered different microenvironmental conditions for L. crassifolium . Proline content was twice higher in leaves of this species in the microhabitats with high soil Na + content than in the closed microhabitat. Every species showed a transient reversible decrease of potential photochemical efficiency of PSII (F v/ F m ) at midday during the study period. In the saline habitat the midday depression of F v/ F m for L. crassifolium was much larger than in case of P. limosa which reflected its higher susceptibility to photoinhibition. In sandy grassland F v/ F m of A. collina was smaller than that of F. pseudovina . Mesophyll succulence index (Sm) expressing the ratio of water content to chlorophyll content was the highest in L. crassifolium (1.6–2.2 g H 2 O mg −1 Chl). Sm was low in xerophyte species (0.5–1.1 g H 2 O mg Chl), and the lowest value was found for the F. pseudovina (0.54 g H 2 O mg Chl).

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Abstract

This paper presents the results of the floristical examinations performed in the units of a former secondary sedimentation pond system in Hungary. The outcome of analyses on the chromium content of the plants is discussed. Beside the chemical analyses, observations on the plants, the characterization of the ecological state of plant stands adapted to heavy metal load. Results of the elemental analysis for heavy metals revealed that none of the plants constituting the natural vegetation can be treated as hyperaccumulator plant. A green cover and the detoxification process of Cr(VI) by plants is suggested to be more important than the present extensive phytoextraction procedure. It can be stated that due to the disturbance our investigated area has diverse vegetation, in addition these plants can tolerate a high concentration of heavy metals, and they are able to take up them.

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Orvosi Hetilap
Authors:
Viktor József Horváth
,
Gy. Ádám Tabák
,
Gergely Szabó
,
Zsuzsanna Putz
,
Csaba Géza Koós
, and
Péter Lakatos

A nem szteroid gyulladásgátló készítmények jótékony hatásaik mellett számos, az alkalmazott gyógyszer típusától és dózisától is függő mellékhatással rendelkeznek. A leggyakoribb gastrointestinalis mellékhatások a terápia megkezdését követően már rövid időn belül jelentkezhetnek, de más nem kívánt hatások, mint a cardiovascularis események kockázatának fokozódása (amelyek a gastrointestinalis mellékhatásokhoz képest lényegesen ritkábbak) is előfordulhatnak a gyógyszerek alkalmazásának megkezdését követően, latenciaperiódus nélkül. Fontos megemlíteni, hogy fájdalomcsillapítás céljából nem szteroid gyulladásgátló kezelést leggyakrabban az idősebb, cardiovascularis szempontból fokozott kockázatú populáción alkalmazzák hosszabb ideig, ahol más gyógyszerek – például a kis dózisú acetilszalicilsav – kölcsönhatásba léphetnek az alkalmazott fájdalomcsillapító készítményekkel; ebben a tekintetben a diclofenac alkalmazása kevesebb kockázatot rejthet magában. Összefoglaló közleményükben a szerzők a nem szteroid gyulladásgátlók cardiovascularis mellékhatásainak előfordulását, azok kialakulását befolyásoló tényezőket és terápiás konzekvenciáit, valamint e készítmények acetilszalicilsavval történő interakcióit elemzik. Orv. Hetil., 2015, 156(13), 516–520.

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