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The molecular mechanisms of the mammalian circadian clock located in the suprachiasmatic nucleus have been essentially studied in nocturnal species. Currently, it is not clear if the clockwork and the synchronizing mechanisms are similar between diurnal and nocturnal species. Here we investigated in a day-active rodent Arvicanthis ansorgei, some of the(More)
In mammals, the suprachiasmatic nuclei (SCN) are the site of the master circadian pacemaker whose molecular core mechanism is based on interlocking transcriptional/translational feedback loops involving clock genes. Among clock genes, Per1 and Per2 are important for both the maintenance of circadian rhythmicity and entrainment to light cues. Several(More)
In the European rabbit (Oryctolagus cuniculus) nursing acts as a strong non-photic synchronizer of circadian rhythmicity in the newborn young. Rabbits only nurse for a few minutes once every 24 h and previous studies have shown that the pups, blind at birth, display endogenous circadian rhythms in behavior and physiology entrained by this regular daily(More)
The molecular clockwork in mammals involves various clock genes with specific temporal expression patterns. Synchronization of the master circadian clock located in the suprachiasmatic nucleus (SCN) is accomplished mainly via daily resetting of the phase of the clock by light stimuli. Phase shifting responses to light are correlated with induction of Per1,(More)
Temporal organization of the molecular clockwork and behavioral output were investigated in nocturnal rats housed in constant darkness and synchronized to nonphotic cues (daily normocaloric or hypocaloric feeding and melatonin infusion) or light (light-dark cycle and daily 1-h light exposure). Clock gene (Per1, Per2 and Bmal1) and clock-controlled gene(More)
The fly algorithm is a strategy employed for 3D reconstruction of scenes, which employs the genetic algorithms and stereovision principles to determine clusters of points corresponding to different objects present in scene. The obtained reconstruction is partial, but enough to recognize obstacles in the robot space work. This 3D reconstruction strategy also(More)
Recent studies suggest that the main olfactory bulb (OB) represents a functional circadian pacemaker. In many altricial mammals, during pre-visual stages of development the olfactory system plays a vital role in their survival. One remarkable example is the European rabbit; the newborns are normally raised in a dark nursery burrow, and the lactating female(More)
During the last decade, lagomorphs have gained relevance as valuable models for the study of the development of circadian rhythmicity. This relevance is due to both the peculiar behavior of the lactating doe, in which maternal care is limited from 3 to 5 min per day, and the temporal organization that newborn rabbits exhibit during the early stages of(More)
The rabbit is particularly suitable for investigating the development of mammalian circadian function. Blind at birth, the pups are only visited by the mother to be nursed once every 24 h for about 3 min and so can be studied largely without maternal interference. They anticipate the mother's visit with increased behavioral arousal and with a rise in body(More)
In the Syrian hamster a serotonergic (5-HTergic) stimulation during daytime acts on the circadian timing system by inducing behavioral phase advances and by decreasing Per1 and Per2 (Period) mRNA levels in the suprachiasmatic nuclei, containing the main circadian clock in mammals. The present study was conducted in Syrian hamsters, housed in constant(More)