19 research outputs found
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Neurosteroid Biosynthesis in the Brain and Pituitary Gland of Salmonid Fishes
The present study was conducted to investigate the relations between neurosteroid biosynthesis and their possible roles on migratory mechanisms of salmonid fishes, using sockeye salmon (Oncorhynchus nerka). First, the ability of brain to produce sex steroid hormones was examined with exogenous steroid substrates during smoltification. It was demonstrated that the brain had the ability to produce sex steroid hormones during smoltification, and the ability tended to be higher in the anterior brain than in the posterior brain. Secondly, the ability of salmon brain and pituitary to synthesize and metabolize cholesterol was examined by in vitro thin-layer chromatography method during sexual maturation. It was revealed that pregnenolone was identified as one of cholesterol metabolites in the brain and pituitary gland. These results suggest that neurosteroids are produced in the brain and pituitary gland of sockeye salmon, and might be involved in smoltification and sexual maturation of salmonid fishes
Plasma insulin and blood sugar levels in normal and diabetic patients after repeated tolbutamide and HB 419
Substrate orientation and processing effects on GaAs/Si misorientation in GaAs-on-Si grown by MBE
Persistent complete remission of acute leukemic-phase CCR4-positive gamma–delta peripheral T-cell lymphoma by autologous stem cell transplantation with mogamulizumab
Projected response of the Indian Ocean Dipole to greenhouse warming
International audienceNatural modes of variability centred in the tropics, such as the El Nino/Southern Oscillation and the Indian Ocean Dipole, are a significant source of interannual climate variability across the globe. Future climate warming could alter these modes of variability. For example, with the warming projected for the end of the twenty-first century, the mean climate of the tropical Indian Ocean is expected to change considerably. These changes have the potential to affect the Indian Ocean Dipole, currently characterized by an alternation of anomalous cooling in the eastern tropical Indian Ocean and warming in the west in a positive dipole event, and the reverse pattern for negative events. The amplitude of positive events is generally greater than that of negative events. Mean climate warming in austral spring is expected to lead to stronger easterly winds just south of the Equator, faster warming of sea surface temperatures in the western Indian Ocean compared with the eastern basin, and a shoaling equatorial thermocline. The mean climate conditions that result from these changes more closely resemble a positive dipole state. However, defined relative to the mean state at any given time, the overall frequency of events is not projected to change [mdash] but we expect a reduction in the difference in amplitude between positive and negative dipole events