02247nas a2200205   4500008004100000022001400041245005800055210005700113260000900170300001000179490000700189520167600196653001201872653001501884653002101899100002401920700002201944700002301966856005201989       2006                        eng d  a0015-549700aResistance of two planarian species to UV-irradiation0 aResistance of two planarian species to UVirradiation  c2006  a103-80 v543 a<p>The aim of this work was to determine the effects of 20, 25 and 30 minute UV-irradiation periods lambda = 253.5 nm to two planarian species Dugesia tigrina (Gir.) and Polycelis felina (Daly.). In vivo, UV light effects have been reported to affect intracellular receptors and disrupt simple behaviour. The effects of UV-rays on mortality and behavior as well as morphological, cytological and histological changes in the two planarian species were assessed, and the course and the dynamics of regenerative processes were compared between them. Experimental populations of Dugesia tigrina and Polycelis felina species were maintained in laboratory conditions at room temperature. Mortality, behavioral and morphological changes were monitored daily by means of a light stereomicroscope. For cytological and histopathological analysis, planarians were fixed in Bouine fixative on the first, second, third, fifth and seventh day after exposure to UV-irradiation, respectively. They were embedded in paraffin, cut on a microtome, stained with toluidin blue and embedded in Canada-balsam. UV-rays caused mortality, behavioral, morphological, cytological and histological changes in each planarian species. In regeneration of damaged body parts reticular cells and neoblasts played the main role. Neoblasts as totipotent cells extremely increased in number in the area of damaged tissue, immediately after UV-exposure. Dugesia tigrina was more sensitive to UV-rays than Polycelis felina due to possession of less pigmented cells. The course of regeneration in both species was similar. Most individuals of both species regenerated in 5 to 12 days after UV-irradiation.</p>
10aAnimals10aplanarians10aUltraviolet Rays1 aKalafatić, Mirjana1 aKovacević, Goran1 aFranjević, Damjan  uhttps://continenticola.myspecies.info/node/171900596nas a2200169   4500008004100000245012600041210006900167260001200236300000900248490000900257100002400266700001800290700001700308700003000325700001900355856005200374       2011                        eng d00aFreshwater planarians (Platyhelminthes, Tricladida) from the Iberian Peninsula and Greece: diversity and notes on ecology0 aFreshwater planarians Platyhelminthes Tricladida from the Iberia  c02/2011  a1-380 v27791 aVila-Farré, Miquel1 aSluys, Ronald1 aAlmagro, Ío1 aHandberg-Thorsager, Mette1 aRomero, Rafael  uhttps://continenticola.myspecies.info/node/1218