We are characterizing specific SCN cell types which generate circadian oscillations, ensure their synchronization with the outside world, and communicate with the rest of the brain. The appropriate timing of ovulation is controlled by both signals from the ovary and the circadian clock. Projections of the SCN contact not only neurons which contain estrogen receptors, but also those which regulate the pituitary. We find that daylength regulates the incorporation of neurons born in adulthood. Steroidal and photoperiodic regulation of opiate binding in male golden hamsters.
Short days increase sensitivity to methadone inhibition of male copulatory behavior.
Regional distribution of iodomelatonin binding sites within the suprachiasmatic nucleus of the Syrian hamster and the Siberian hamster. Effects of photoperiod and androgen on pituitary function and neuropeptide staining in Siberian hamsters. Control of phase and period of circadian rhythms restored by suprachiasmatic grafts. Effects of photoperiod duration and melatonin signal characteristics on the reproductive systems of male Syrian hamsters . Localization and partial characterization of melatonin receptors in amphioxus, hagfish, lamprey and skate.