Találati lista | Tudóstér

001-es BibID:	BIBFORM068021
Első szerző:	Baycu, Gülriz
Cím:	Abiotic stress effects on the antioxidative response profile of Albizia julibrissin Durazz. (Fabaceae) / Gülriz Baycu, Sven Erik Rognes, Hakan Özden, Nihal Gören-Saglam, István Csatári, Szilárd Szabó
Dátum:	2017
Megjegyzések:	Abiotic stresses (e.g., heavy metals, drought, cold, or combinations) induce oxidative stress with overproduction of reactive oxygen species (ROS). We have investigated the antioxidative responses of Albizia julibrissin Durazz. (silk tree, Fabaceae). Four-month-old plants grown in sand cultures were subjected to various single or sequential treatments involving exposure to cadmium (50-250 ?mol L-1 Cd), lead (1000-5000 ?mol L-1 Pb), chilling at 4 ?C (CH), or drought (DR), for a period of 7?45 days. Leaf extracts were assayed for glutathione peroxidase (GPX), glutathione-disulfide reductase (GR), catalase (CAT), soluble proline (Pro), ascorbate peroxidase (APX), and guaiacol peroxidase (GUAPX). Cd and Pb accumulation in the leaves was also measured. CAT activity decreased strongly with increasing Pb exposure and after CH. It was also found to be reduced after Cd and DR treatments. GR activity increased highly in nearly all treatments, most strongly at high Cd or Pb, after DR + CH, and after CH followed by Cd. GUAPX and GPX showed similar trends of increase. APX activity dropped after CH, but increased after low Cd treatment and in CH + DR sequential stresses. Massive accumulation of soluble Pro occurred after 14?21 days in highly Cd- or Pb-stressed plants. CH or DR acclimation led to some alterations of antioxidative responses, particularly for CAT, GR, and APX. Our data indicate that GSH, GSH-linked redox systems, peroxidases, and Pro are possibly the more important antioxidants under severe stress.
Tárgyszavak:	Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban Antioxidative enzymes Chilling Drought Heavy metal Proline
Megjelenés:	Brazilian Journal of Botany. - 40 : 1 (2017), p. 21-32. -
További szerzők:	Rognes, Swen Erik Özden, Hakan Gören-Saglam, Nihal Csatári István (1986-) (környezetkutató ökológus) Szabó Szilárd (1974-) (geográfus)
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
Borító:
Saját polcon:

001-es BibID:	BIBFORM061351
Első szerző:	Csatári István (környezetkutató ökológus)
Cím:	Nitrogen and carbon concentrations in the samples of soil, sediment and Phragmites australis (common reed) from Küçükçekmece Lagoon area (Istanbul, Turkey) / Istvan Csatari, Gülriz Baycu, Ender Makineci, Szilard Szabo, Doganay Tolunay, Gyula Lakatos
Dátum:	2015
ISSN:	1018-4619
Megjegyzések:	Küçükçekmece Lagoon in Istanbul (Turkey) receives increasing attention due to its deteriorating water quality and the pollution of the surrounding watershed. In this study, seven sampling points were selected and environmental parameters including lagoon water (pH, electrolytic conductivity), sediment and soil of the littoral zone (pH, electrolytic conductivity, texture, shell content, total carbon and nitrogen concentrations) were measured and the effects of high salinity on the total C, total N, and C/N ratio in different organs of Phragmites australis were discussed. According to the electrolytic conductivity results, our sampling sites can be considered as highly saline environments. Texture analyses have indicated that the sediment and soil samples were mostly sandy with a high sensitivity to pollution discharges. Highest N concentrations were measured in the leaves of Phragmites with an increasing order in the urban, agricultural and industrial sampling sites (1.73-3.29%). N inputs into the highly saline Kü₀cük₀cekmece Lagoon can be associated with different pollution sources and the observed Phragmites australis stands may be favourable for the natural elimination of N in this area.
Tárgyszavak:	Természettudományok Környezettudományok idegen nyelvű folyóiratközlemény külföldi lapban Nitrogén szén nád
Megjelenés:	Fresenius Environmental Bulletin. - 24 : 4 (2015), p. 1558-1567 -
További szerzők:	Baycu, Gülriz Makineci, Ender Szabó Szilárd (1974-) (geográfus) Tolunay, Doganay Lakatos Gyula (1949-) (ökológus)
Internet cím:	Intézményi repozitóriumban (DEA) tárolt változat
Borító:
Saját polcon: