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001-es BibID:	BIBFORM018944
Első szerző:	Bácsi István (biológus)
Cím:	Observation of Sward Destruction Caused by Irrigation with Toxic Microcystis Morphospecies Containing Water in Southern Hungary / István Bácsi, Gyula Surányi, Sándor Gonda, Gyöngyi Gyémánt, Gábor Vasas
Dátum:	2011
ISSN:	0007-4861
Megjegyzések:	In the summer of 2006 bloom-like phenomenon occurred in a garden pond in Szeged, Southern Hungary. After regular watering of a sward with pond water containing the algal mass, destruction of garden grass occurred. Microcystis aeruginosa, Microcystis viridis, Microcystis ichthyoblabe, and Microcystis wesenbergii were identified by light microscopy in the water sample; microcystin-FR, -LR, -RR and -YR were determined by matrix-assisted laser desorption/ionization time-of-flight analysis. There was an 80% decrease in the green mass (87% in chlorophyllcontent) of the grass in a 1 m2 area of the garden irrigated with pond water.
Tárgyszavak:	Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban Microcystis Irrigation Grass destruction Microcystins
Megjelenés:	Bulletin Of Environmental Contamination And Toxicology 86 : 2 (2011), p. 232-237. -
További szerzők:	Surányi Gyula (1957-) (biológus) Gonda Sándor (1984-) (gyógyszerész) Vasas Gábor (1975-) (biológus-vegyész) Gyémánt Gyöngyi (1960-) (vegyész)
Pályázati támogatás:	OTKA F046493 OTKA K81370
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001-es BibID:	BIBFORM081295
Első szerző:	Oláh Viktor (biológus)
Cím:	Assessment of Giant Duckweed (Spirodela polyrhiza L. Schleiden) Turions as Model Objects in Ecotoxicological Applications / Viktor Oláh, Anna Hepp, Ilona Mészáros
Dátum:	2016
ISSN:	0007-4861
Megjegyzések:	In this study germination of Spirodela polyrhiza (L.) Schleiden (giant duckweed) turions was assessed under cadmium exposure to test applicability of a novel turion-based ecotoxicology method. Floating success of germinating turions, protrusion of the first and subsequent fronds as test endpoints were investigated and compared to results of standard duckweed growth inhibition tests with fronds of the same species. Our results indicate that turions can be used to characterize effects of toxic substances. Initial phase of turion germination (floating up and appearance of the first frond) was less sensitive to Cd treatments than the subsequent frond production. The calculated effective concentrations for growth rates in turion and normal frond tests were similar. Single frond area produced by germinating turions proved to be the most sensitive test endpoint. Single frond area and colony disintegration as additionally measured parameters in normal frond cultures also changed due to Cd treatments but the sensitivity of these parameters was lower than that of growth rates.
Tárgyszavak:	Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk Vegetative propagule Germination test Growth inhibition test Cadmium
Megjelenés:	Bulletin Of Environmental Contamination And Toxicology. - 96 : 5 (2016), p. 596-601. -
További szerzők:	Hepp Anna (1991-) (biotechnológus) Mészáros Ilona (1952-) (biológus)
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001-es BibID:	BIBFORM081499
Első szerző:	Vehovszky Ágnes
Cím:	Pharmacological studies confirm neurotoxic metabolite(s) produced by the bloom-forming Cylindrospermopsis raciborskii in Hungary / Á. Vehovszky, A. W. Kovács, A. Farkas, J. Győri, H. Szabó, G. Vasas
Dátum:	2015
ISSN:	1520-4081
Megjegyzések:	A rapid cyanobacterial bloom of Cylindrospermopsis raciborskii (3.2 x 104 filaments/mL) was detected early November, 2012, in the Fancsika pond (East Hungary). The strong discoloration of water was accompanied by a substantial fish mortality (even dead cats were seen on the site), raising the possibility of some toxic metabolites in the water produced by the bloom?forming cyanobacteria (C. raciborskii). The potential neuronal targets of the toxic substances in the bloom sample were studied on identified neurons (RPas) in the central nervous system of Helix pomatia. The effects of the crude aqueous extracts of the Fancsika bloom sample (FBS) and the laboratory isolate of C. raciborskii from the pond (FLI) were compared with reference samples: C. raciborskii ACT 9505 (isolated in 1995 from Lake Balaton, Hungary), the cylindrospermopsin producer AQS, and the neurotoxin (anatoxin?a, homoanatoxin?a) producer Oscillatoria sp. (PCC 6506) strains. Electrophysiological tests showed that both FBS and FLI samples as well the ACT 9505 extracts modulate the acetylcholine receptors (AChRs) of the neurons, evoking ACh agonist effects, then inhibiting the ACh?evoked neuronal responses. Dose-response data suggested about the same range of toxicity of FBS and FLI samples (EC50?=?0.397 mg/mL and 0.917 mg/mL, respectively) and ACT 9505 extracts (EC50?=?0.734 mg/mL). The extract of the neurotoxin?producing PCC 6506 strain, however, proved to be the strongest inhibitor of the ACh responses on the same neurons (EC50?=?0.073 mg/mL). The presented results demonstrated an anatoxin?a?like cholinergic inhibitory effects of cyanobacterial extracts (both the environmental FBS sample, and the laboratory isolate, FLI) by some (yet unidentified) toxic components in the matrix of secondary metabolites. Previous pharmacological studies of cyanobacterial samples collected in other locations (Balaton, West Hungary) resulted in similar conclusions; therefore, we cannot exclude that this chemotype of C. raciborskii which produce anatoxin?a like neuroactive substances is more widely distributed in this region.
Tárgyszavak:	Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk cyanobacteria bloom sample fish mortality acetylcholine Helix pomatia
Megjelenés:	Environmental Toxicology. - 30 : 5 (2015), p. 501-512. -
További szerzők:	Kovács W. Attila Farkas Anna (1984-) (biológus) Győri János Szabó H. Vasas Gábor (1975-) (biológus-vegyész)
Pályázati támogatás:	OTKA K63451 OTKA OTKA K81370 OTKA OTKA F046493 OTKA GVOP-3.2.1. GVOP GVOP-TST 3.3.1-05/1-2005-05-0004/3.0 egyéb TÁMOP-4.2.2/B-10/1-2010-0024 TÁMOP
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