Találati lista | Tudóstér

001-es BibID:	BIBFORM001297
035-os BibID:	(Wos)000222590300004 (Scopus)2442668507
Első szerző:	Röszer Tamás (orvos, biológus)
Cím:	Structural diversity of NADPH diaphorase-reactive enteral networks in Stylommatophora (Gastropoda, Pulmonata) / Tamás Röszer, Zsolt Jenei, Zoltán Serfözö, Zsolt Czimmerer, Gáspár Bánfalvi
Dátum:	2004
Megjegyzések:	In this work we investigated the involvement of putative nitric oxide (NO)-forming neurons in enteric plexuses of stylommatophoran gastropods. The nitric oxide synthase (NOS)-containing cells were detected by NADPH diaphorase (NADPHd) histochemistry in the entreral nervous systems of several stylommatophoran species (Achatinacea: Achatina fulica, Helicacea: Cepaea hortensis, Cepaea nemoralis, Discus rotundatus, Helicella obvia, Helix lucorum, Helix lutescens, Monachoides umbrosa, Trichia hispida, Zebrina detrita, Succineacea: Succinea putris, Vertiliginacea: Clausilia dubia, Zonitacea: Arion ater, Arion subfuscus, Limax maximus). We detected the NO synthesis of isolated midintestinal segments by Griess's quantification of nitrite, one end product of NO. Effects of the NOS substrate L-arginine and the NOS inhibitor N?-nitro-L-arginine (NOARG) were also tested on nitrite production. We found NADPHd-reactive neurons and extrinsic nerves with NADPHd-stained fibers within the myenteric and submucosal networks of the midintestine of investigated members of Helicacea, Succineacea, and Vertiliginacea families. These networks innervated the midintestinal musculature and several nerve cells of the myenteric and submucosal plexi. In investigated members of Achatinacea and Zonitacea, NADPHd-stained networks were not detectable within the digestive tract. Administration of 1 mM L-arginine elevated, whereas 2 mM of NOARG diminished, the nitrite levels of the NADPHd-stained networks containing midintestine in C. nemoralis and H. lucorum. Enteral NADPHd staining was not detected in A. ater and L. maximus, and the nitrite production was not affected by L-arginine. Our results indicate a possible, but evolutionarily not conserved, NO-mediated enteral transmission in stylommatophoran gastropods.
Tárgyszavak:	Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban NADPH diaforáz nitrogénmonoxid szintáz enterális idegrendszer lábasfejűek
Megjelenés:	Invertebrate Biology. - 123 : 2 (2004), p. 128-135. -
További szerzők:	Jenei Zsolt Serfőző Zoltán Czimmerer Zsolt (1981-) (molekuláris biológus) Bánfalvi Gáspár (1943-) (sejtbiológus, gyógyszerész)
Internet cím:	elektronikus változat
Borító:
Saját polcon:

001-es BibID:	BIBFORM079655
Első szerző:	Tökölyi Jácint (biológus)
Cím:	Life history traits and previous exposure predict resistance to UV irradiation in the freshwater cnidarian / Tökölyi Jácint, Kozma Beatrix, Sebestyén Flóra, Miklós Máté, Barta Zoltán
Dátum:	2017
ISSN:	1077-8306 1077-8306
Megjegyzések:	Abiotic stress is an important source of mortality for cnidarians and is likely to be a major factor shaping their life histories. In freshwater hydra, the ability to withstand exogenous sources of stress varies between species and populations, but little is known about the factors responsible for this variation. Here, we investigated resistance to UV irradiation in Hydra oligactis, a common temperate freshwater cnidarian. We collected polyps from 12 populations and propagated these asexually under standard conditions in the laboratory to obtain 69 laboratory clonal lines with a total of 324 polyps of different age. We measured the size of polyps and recorded their budding rate. In addition, a subset of animals was exposed to hormetic treatment, where experimental animals received a short, sublethal irradiation 2 d before testing their resistance to a higher dose. We investigated how life history traits (age, size, and budding rate), hormetic treatment, and the interaction between life history traits and hormetic treatment relate to the ability of hydra polyps to tolerate high doses of UV irradiation. In multivariate models controlling for the effect of other variables, stress tolerance was positively related to age (lower tolerance in freshly detached buds compared to adult hydra) and size (higher tolerance in polyps with a large body column). Budding rate was negatively associated with stress tolerance. Hormetic treatment increased resistance to UV irradiation, but we found no evidence for an interaction between hormetic response and any of the life history traits, suggesting that the ability to upregulate physiological defense mechanisms after exposure to mild stress does not depend on the life history background of the individuals.
Tárgyszavak:	Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban abiotic stress Cnidaria hormesis resource allocation somatic maintenance
Megjelenés:	Invertebrate Biology. - 136 : 2 (2017), p. 217-227. -
További szerzők:	Kozma Beatrix Sebestyén Flóra (1993-) (biológus) Miklós Máté (1994-) (biológus) Barta Zoltán (1967-) (biológus, zoológus)
Pályázati támogatás:	NTP-EFO-P-15 Egyéb
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
Borító:
Saját polcon: