Circadian Modulation
Mostrando 1-12 de 32 artigos, teses e dissertações.
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1. Chronotype ontogeny related to gender
Chronotype is an established concept designed to identify distinct phase relationships between the expression of circadian rhythms and external synchronizers in humans. Although it has been widely accepted that chronotype is subjected to ontogenetic modulation, there is no consensus on the interaction between age and gender. This study aimed to determine the
Braz J Med Biol Res. Publicado em: 08/04/2014
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2. The expression of melanopsin and clock genes in Xenopus laevis melanophores and their modulation by melatonin
Vertebrates have a central clock and also several peripheral clocks. Light responses might result from the integration of light signals by these clocks. The dermal melanophores of Xenopus laevis have a photoreceptor molecule denominated melanopsin (OPN4x). The mechanisms of the circadian clock involve positive and negative feedback. We hypothesize that these
Brazilian Journal of Medical and Biological Research. Publicado em: 2012-08
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3. Serotonin and circadian rhythms
All mammal behaviors and functions exhibit synchronization with environmental rhythms. This is accomplished through an internal mechanism that generates and modulates biological rhythms. The circadian timing system, responsible for this process, is formed by connected neural structures. Pathways receive and transmit environmental cues to the central oscillat
Psychology & Neuroscience. Publicado em: 2010-12
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4. Retina de aves como sistema circadiano e sua modulação por luz e glutamato / Avian retina as a circadian system and its modulation by light and glutamate
The avian circadian system is composed by the retina, the mammalian homolog region of the supra-chiasmatic nucleus (SNC) and the pineal gland. The retina itself shows many rhythmic physiological events, such as movements of photoreceptor cells, opsin expression, retinaldehyde re-isomerization, melatonin and dopamine production and release. Altogether these r
Publicado em: 2009
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5. Organização temporal em processos de condicionamento classico aversivo e na expressão da proteina Zenk no hipocampo de pombos (C. livia) / Temporal organization of classical aversive conditioning processes and expression of Zenk protein in the hippocampus of pigeons (C. livia)
Part of the knowledge about the mechanisms and neural basis of learning, memory and amnesia is based on the investigation of neural correlates of the behavior of non human animals in aversive situations. Moreover, many studies suggest that these behavioral processes are affected by the circadian timing system. The procedures of classical aversive conditionin
Publicado em: 2009
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6. Daily rhythm of aggregation in the haematophagous bug Triatoma infestans (Heteroptera: Reduviidae)
Triatomine bugs show a temporal modulation of many activities. Here, we analyse the daily modulation of the aggregation behaviour of Triatoma infestans larvae and its chronobiological basis. In the laboratory, groups of six bugs were released over an experimental arena during six consecutive days, where their aggregation behaviour was quantified every hour.
Memórias do Instituto Oswaldo Cruz. Publicado em: 03/05/2007
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7. Estampa temporal na memória de reconhecimento em estudantes universitários
Several studies have shown that there is a circadian modulation of explicit memory. This modulation can occur independently in each one of the mnemonic processes. The aim of this study was to evaluate the influence of time of training on short-term memory (STM) and long-term memory (LTM), using a recognition task. Moreover, a possible circadian modulation in
Publicado em: 2007
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8. Modulação dos genes de relógio Per1, Cry1b, Clock e da melanopsina por endotelina-1 em células embrionárias de Danio rerio / Modulation of clock genes Per1, Cry1b, Clock and of melanopsin by endothelin-1 in Danio rerio embryonic cells
Biological clocks are endogenous timekeepers that are present both in eukaryotic as in prokaryotic organisms. Different clocks have different periods, and those that have about 24h of oscillation are called circadian clocks. In mammals, the first identified circadian clock is located in the suprachiasmatic nucleus, in the hipothalamus. It is now well known t
Publicado em: 2007
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9. Modulação do sistema nervoso autônomo mensurado pela análise da variabilidade da freqüência cardíaca em pacientes com fibromialgia / Modulation of autonomic nervous system measured by heart rate variability in patients with fibromyalgia
INTRODUÇÃO: Pacientes com fibromialgia (FM) apresentam distúrbios no sistema de resposta ao estresse, o qual é composto pelo eixo hipotalâmico-pituitário-adrenal (HPA) e pelo sistema nervoso autônomo. Recentemente, tem havido muito interesse na possível função do sistema nervoso autônomo na patogênese da FM. O objetivo deste estudo foi avaliar a
Publicado em: 2007
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10. Modulação circadiana da aprendizagem e memoria em pombos : analise da sensibilização e do condicionamento classico aversivo da resposta ao som / Circadian modulation of learning and memory in pigeons: analysis of sensitization and classical fear conditioning of acoustic response
O comportamento exploratório garante a inspeção, a localização, a identificação e a avaliação precisa de eventos ambientais. A exploração também é abordada como sendo relacionada com a curiosidade do animal direcionada a novos estímulos. Os comportamentos reflexos que precedem as reações exploratórias, caracterizando-se, portanto, como compo
Publicado em: 2006
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11. Circadian modulation of complex learning in diurnal and nocturnal Aplysia
Understanding modulation of memory, as well as the mechanisms underlying memory formation, has become a key issue in neuroscience research. Previously, we found that the formation of long-term, but not short-term, memory for a nonassociative form of learning, sensitization, was modulated by the circadian clock in the diurnal Aplysia californica. To define th
National Academy of Sciences.
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12. Circadian modulation of long-term sensitization in Aplysia
As the mechanisms for learning and memory are elucidated, modulation of learning and memory becomes a central issue. We studied the modulation of learning and memory by investigating the circadian regulation of short- and long-term sensitization of the siphon withdrawal reflex in Aplysia. We found that Aplysia exhibited diurnal and circadian rhythms of long-
National Academy of Sciences.