Efeitos de vocalizações de co-específicos e do escuro sobre o ritmo circadiano da atividade motora em sagüis (Callithrix jacchus)

The principal zeitgeber for most of species is the light-dark photocycle (LD), though other environment factors as food availability, temperature and social cues may act. Daily adjustment of the circadian pacemaker may result from integration of environmental photic and non-photic cues with homeostatic cues. Characterization of non-photic effects on circadian timing system in diurnal mammals is scarce in relation to nocturnal, especially for ecologically significant cues. Thus, we analyzed the effect of conspecific vocalizations and darkness on circadian activity rhythm (CAR) in the diurnal primate Callithirx jacchus. With this objective 7 male adults were isolated in a room with controlled illumination, temperature (26,8 ± 0,2°C) and humidity (81,6 ± 3,6%), and partial acoustic isolation. Initially they were under LD 12:12 (~300:2 lux), and subsequently under constant illumination (~2 lux). Two pulses of conspecific vocalizations were applied in total darkness, separated by 22 days, at 7:30 h (external time) during 1 h. They induced phase delays at circadian times (CTs) 1 and 10 and predominantly phase advances at CTs 9 and 15. After that, two dark pulses were applied, separated by 14 days, during 1 h at 7:30 h (external time). These pulses induced phase delays at CTs 2, 3 and 18, predominantly phase advances at CTs 8, 10 and 19, and no change at CT 14. However, marmosets CAR showed oscillations in endogenous period and active phase duration influenced by vocalizations from animals outside the experimental room, which interfered on the phase responses to pulses. Furthermore, social masking and relative coordination with colony were observed. Therefore, phase responses obtained in this work cannot be attributed only to pulses. Afterwards, pulses of conspecific vocalizations were applied in total darkness at 19:00 h (external time), during 1 h for 5 consecutive days, and after 21 days, for 30 consecutive days, on attempt to synchronize the CAR. No animal was synchronized by these daily pulses, although oscillations in endogenous period were observed for all. This result may be due to habituation. Other possibility is the absence of social significance of the vocalizations for the animals due to random reproduction, since each vocalization has a function that could be lost by a mixture of sounds. In conclusion, conspecific vocalizations induce social masking and relative coordination in marmosets CAR, acting as weak zeitgeber

Sincronização dos ritmos de atividade motora e temperatura central à disponibilidade de glicose em ratos

Food is essential for the survival of all animals. Its temporal availability is an important enviromental cue for the behavioral and physiological organization throughout the 24 hours of day in different species. Rats and mice, for example, show increased locomotion in the hours before food availability when it is presented in a recurrent manner, a behavior named foodanticipatory activity. Several lines of evidence indicate that this anticipation is mediated by a circadian oscillator. In this work, based on the hypothesis that pre- or post-ingestive humoral signals are involved in the entrainment process, we tested whether the daily intake of glucose is sufficient to induce anticipatory activity in rats. The rhythms of motor activity and central temperature were recorded in animals undergoing 10 days of temporal glucose (solution at 50%) or chow restriction in light-dark (LD) and constant darkness (DD). Animals under temporal glucose restriction increase motor activity and and central temperature in the hours preceding glucose availability and such aticipation is extremely similar to that observed in animals under temporal chow restriction. Glucose ingestion is, therefore, a sufficient temporal cue to induce anticipation in rats. It is possible that the increase in plasma glucose after food ingestion constitutes one of the signals involved in the behavioral entrainment process to food availability

Ser-tão de Buriti: o corpo de noturno rumor (a poética de Guimarães Rosa e o pensamento literário contemporâneo)

This thesis is to analyze the fictional texture of Buriti, novella by Guimarães Rosa, which makes part of Corpo do Baile. Gilles Deleuze‘s philosophical background as well as similar theorists such as Mircea Eliade, Derrida, Bataille, Foucault, Blanchot and Nie-tzsche constitute the main reference, as example of Guimarães Rosa‘s problematizing writing, since they present as basic element of thought the desterritorialization of con-cepts, standards and institutionalized knowledge by the dominant literary language. Along with the theoretical perspective of current alterity on these authors, Buriti is crossed by one aesthetics substantiated with a multiplicity of narrative points of view, opening gaps to other non-sacralized, nomadic voices, using polyphony as a way of breaking and destabilizing crystallized truths related to the canons of mother tongue. Interwoven by a poetic side of transgression, the narrative of Buriti finds especially marked by the signs of the backlands and of the night, which rhizomatically point to a sense of infinity, eternity, loneliness, vertigo before the abyssal, evoking the singularity of a ser-tão before the night, "the body of nocturnal rumor." The nights in the backlands in Buriti give rise to the emergence of a state of subjectivity, the ser-tão, whose nature is shown as a space of communion of the various beings that humans put on the same level of other living beings, setting up a sharing cosmic territory, enjoyment between pain and pleasure, between death and life. It is the night in the darkness, the shadows, the ser-tão is exposed, the being in his depth, facing himself with his internal rumors, which project themselves through the noise, the sound amplified by the vastness of the night at the desert backlands. "The backlands is the night." (ROSA, 1988, p.92).

Ser-tão de Buriti: o corpo de noturno rumor (a poética de Guimarães Rosa e o pensamento literário contemporâneo)

This thesis is to analyze the fictional texture of Buriti, novella by Guimarães Rosa, which makes part of Corpo do Baile. Gilles Deleuze‘s philosophical background as well as similar theorists such as Mircea Eliade, Derrida, Bataille, Foucault, Blanchot and Nie-tzsche constitute the main reference, as example of Guimarães Rosa‘s problematizing writing, since they present as basic element of thought the desterritorialization of con-cepts, standards and institutionalized knowledge by the dominant literary language. Along with the theoretical perspective of current alterity on these authors, Buriti is crossed by one aesthetics substantiated with a multiplicity of narrative points of view, opening gaps to other non-sacralized, nomadic voices, using polyphony as a way of breaking and destabilizing crystallized truths related to the canons of mother tongue. Interwoven by a poetic side of transgression, the narrative of Buriti finds especially marked by the signs of the backlands and of the night, which rhizomatically point to a sense of infinity, eternity, loneliness, vertigo before the abyssal, evoking the singularity of a ser-tão before the night, "the body of nocturnal rumor." The nights in the backlands in Buriti give rise to the emergence of a state of subjectivity, the ser-tão, whose nature is shown as a space of communion of the various beings that humans put on the same level of other living beings, setting up a sharing cosmic territory, enjoyment between pain and pleasure, between death and life. It is the night in the darkness, the shadows, the ser-tão is exposed, the being in his depth, facing himself with his internal rumors, which project themselves through the noise, the sound amplified by the vastness of the night at the desert backlands. "The backlands is the night." (ROSA, 1988, p.92).