1,721,289 research outputs found
Valutazione del rischio come possibile strumento per indirizzare gli interventi sulle strutture ospedaliere
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Morphological and biochemical patterns in developing oocytes relatet with Spawning induction in farmed corb, Umbrina cirrosa L.
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Sunscreen active ingredients in loggerhead turtles (Caretta caretta) and their relation to molecular markers of inflammation, oxidative stress and hormonal activity in wild populations
No full textThe present study sought to determine bioaccumulation and potential molecular effects of four of the most environmentally significant sunscreen agents in juvenile loggerhead sea turtles (Caretta caretta) from the Italian coasts of the central Adriatic Sea. Each of these sunscreen agents were found in most of the plasma samples analyzed, with benzophenone-3 as the dominant species. Total concentrations of the sunscreen agents ranged from not detected
A scuola di acquariologia
No full textè presa in esame la legislazione in materia di commercio di pesci ornamental
Fat body involvement in the plasma vitellogenin changes during recovery phase in Rana esculenta
No full textThe role of fat body in the reproductive physiology of Rana esculenta was investigated during recovery phase. Changes in the ovarian weight, plasma vitellogenin (VTG) and estradiol-17-beta-levels were analyzed in intact frogs, in those without fat bodies (FBD) and in males and females injected with estradiol-17-beta. The ovarian weight decreased by day 28 in intact females but not in FBD animals. At the same time plasma VTG titers sharply decreased on day 21 in intact animals, but no significant changes were found in FBD females. Male frogs never synthetize VTG; they do so, however, after injection of estradiol-17-beta, FBD males showed higher VTG titers than intact males. The results obtained in vitro showed a sharp decrease of vitellogenin added in the medium of cultured fat body. Thus, the in vivo and in vitro results allow us to suggest that fat bodies metabolize plasma vitellogenin, at least during recovery phase; therefore ovarian growth may depend on an interplay among hepatic vitellogenin synthesis, fat body metabolic activity and ovarian uptake
Morphological and biochemical patterns in developing oocytes relatet with Spawning induction in farmed corb, Umbrina cirrosa L.
No full textIn vitro induction of vitellogenin synthesis in Rana esculenta: role of the pituitary
No full textVitellogenin (VTG), a complex protein, is a precursor of yolk proteins (lipovitellin and phosvitin) in all oviparous vertebrates studied to date. In amphibians, as in other oviparous vertebrates, VTG synthesis is hormonally dependent; estradiol-17β (E2) is especially important, although in vivo in the frog Rana esculenta the pituitary may be involved in hepatic VTG synthesis and secretion. The present in vitro experiments carried out during the main phases of the annual reproductive cycle of this frog showed that homologous pituitary homogenate (HPH), as well as E2, stimulated VTG synthesis in male and female livers, although their patterns of VTG secretion showed some differences with respect to the induction time and the rate of VTG secretion. The hepatic response to HPH occurred after a longer time than that of E2 VTG induction, and no cooperation between HPH and E2 was found in the VTG synthesizing response. It should be emphasized that during the refractory period (July), hepatic VTG synthesis in males and females could only be induced by HPH. These data demonstrate, for the first time, a direct action of HPH on VTG synthesis in male and female frog livers in all the periods tested; hepatic responsiveness to HPH and E2 varies with season and sex
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