RESUMO
The present article is the adapted version of an electronic symposium organized by the Brazilian Society of Neuroscience and Behavior (SBNeC) which took place on June 14, 2000. The text is divided into three sections: I. The main issues, II. Chronodrugs, and III. Methods. The first section is dedicated to the perspectives of chronobiology for the next decade, with opinions about the trends of future research being emitted and discussed. The second section deals mostly with drugs acting or potentially acting on the organism's timing systems. In the third section there are considerations about relevant methodological issues concerning data analysis
Assuntos
Humanos , Encéfalo/fisiologia , Cronobiologia/fisiologia , Pesquisa/tendências , Encéfalo/efeitos dos fármacos , Cronobiologia/efeitos dos fármacos , Redes de Comunicação de ComputadoresRESUMO
Grooming is an important social activity among primates. In an investigation of its diurnal distribution, all grooming episodes (self-and allo-) were recorded in three families of captive common marmosets (Callithrix jacchus) kept under natural environmental conditions at hourly intervals for periods of 20 min from 05:00 to 18:00 h, for three consecutive days a week for four weeks. The three families were composed of a reproductive pair and their offspring, with 8, 8 and 7 individuals, respectively. No significant variations were detected within families in terms of days or weeks. However, one family did perform more grooming than the others. The frequency of grooming episodes per hour/per family was higher during the period from 08:00-12:00 h, with acrophases narrowly distributed near 10:00 h, (Family 1 = 10:32 ñ 00:33 h; Family 2 = 10:11 ñ 00:13 h; Family 3 = 09:45 ñ 00:14 h) and lower frequencies were observed at the beginning and end of the active period. The differences between families are probably related to the social dynamics of the individual groups and not to their size
Assuntos
Animais , Masculino , Feminino , Comportamento Animal , Callithrix/anatomia & histologia , Ritmo Circadiano , Asseio Animal , Especificidade da Espécie , Atividade Motora , Primatas/anatomia & histologia , Fatores de TempoRESUMO
In Wistar rats synchronized to a 12-h light/12-h dark cycle (lights on from 08:00 to 20:h), the ip injection of methyleugenol (200 mg/Kg) at 08:00, 12:00 and 16:00 h significantly increased the sleeping time (time between loss and recovery of righting reflex) when compared to animals anesthetized at 20:00, 24:00 and 04:00h. These data provide another example of the importance of circadian rhythms in biological systems and their practical relevance to pharmacology