Animal Circadian Rhythms
Mostrando 1-12 de 19 artigos, teses e dissertações.
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1. Differential susceptibility of BALB/c, C57BL/6N, and CF1 mice to photoperiod changes
Objective:Circadian disturbances common to modern lifestyles have been associated with mood disorders. Animal models that mimic such rhythm disturbances are useful in translational research to explore factors contributing to depressive disorders. This study aimed to verify the susceptibility of BALB/c, C57BL/6N, and CF1 mice to photoperiod changes.Methods:Th
Rev. Bras. Psiquiatr.. Publicado em: 24/03/2015
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2. Estudo de associações entre o gene PER3 e a sincronização de ritmos circadianos pelo claro/escuro / Study of association between PER3 gene and circadian rhythms synchronization to light/dark]
O gene Per3 está envolvido na regulação de mecanismos de temporização circadiana. Sua real função ainda não está totalmente elucidada. Algumas hipóteses atuais nos levam a crer que este gene tenha algum papel no mecanismo de sincronização ao estímulo luminoso em ciclos claro/escuro. O principal objetivo deste trabalho foi investigar as possívei
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/09/2011
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3. Estudo da ontogênese dos ritmos biológicos em neonatos humanos e ratos. / Study of the ontogenesis of biological rhythms in newborns humans and rats.
Fatores ambientais podem modificar o desenvolvimento dos ritmos biológicos em neonatos, como já demonstrado em ratos. Neste contexto insere-se o estudo de recém-nascidos pré-termo mantidos em unidades de cuidado neonatal. Descrevemos neste trabalho a evolução da ritmicidade no ciclo vigília/sono, atividade/repouso, temperatura do punho e alimentação
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 04/08/2011
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4. Papel da melatonina na regulação da ritmicidade circadiana de tecidos periféricos envolvidos com o metabolismo energético: avaliação do perfil diário da expressão dos genes relógio (clock genes). / Role of melatonin in regulating circadian rhythms in peripheral tissues involved in energy metabolism: evaluation of the daily profile of the expression of clock genes.
O metabolismo energético é dependente, dentre outros fatores, de uma temporização circadiana entre os tecidos participantes da regulação metabólica. O processo de sincronização parece depender da expressão dos genes relógio e de mediadores como a melatonina, que associam o oscilador central e os osciladores periféricos. Investigamos o papel da me
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/07/2011
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5. Caracterização do perfil diário da lipólise e lipogênese no tecido adiposo de ratos adultos e a influência da pinealectomia. / Characterization of the daily profile of lipolysis and lipogenesis in adipose tissue of adult rats and the influence of pinealectomy.
O objetivo do trabalho foi investigar se há ritmicidade dos eventos lipolíticos e lipogênicos no TA peri-epididimal e caracterizar se a pinealectomia interfere nesse processo. O sacrifício dos animais, controles e pinealectomizados, foi realizado de quatro em quatro horas. Em relação a lipogênese observaram-se diferenças significativas entre os horá
Publicado em: 2010
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6. Temporal organization in Pyrrhura lepida lepida / Organização temporal em Pyrrhura lepida lepida
The behaviours of many animals are organized in the rhythmic pattern as mechanism of the adaptation in a cyclical environment. The goal of this research was describe the daily distribution of the behaviors in Pyrrhura lepida lepida, to characterize your temporal organization. It was observed, individually, the behaviour of four birds that are living at the Z
Publicado em: 2008
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7. COMPORTAMENTO DE PEQUENOS FELINOS NEOTROPICAIS EM CATIVEIRO
The lack of information concerning the small neotropical felids can be related to their predominant nocturnal activity, use of dense vegetation and hunting that threats natural populations. Therefore, research with captive animals may supply essential information for the development of effective conservation plans and strategies. The aim of this work was to
Publicado em: 2008
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8. PERIOD2::LUCIFERASE real-time reporting of circadian dynamics reveals persistent circadian oscillations in mouse peripheral tissues
Mammalian circadian rhythms are regulated by the suprachiasmatic nucleus (SCN), and current dogma holds that the SCN is required for the expression of circadian rhythms in peripheral tissues. Using a PERIOD2::LUCIFERASE fusion protein as a real-time reporter of circadian dynamics in mice, we report that, contrary to previous work, peripheral tissues are capa
National Academy of Sciences.
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9. Disruption of circadian regulation by brain grafts that overexpress Alzheimer beta/A4 amyloid.
Alzheimer disease patients exhibit irregularities in the patterns of normally circadian (daily) rhythms. Alzheimer-type pathology has been reported in the hypothalamus and in the suprachiasmatic nuclei, the putative site of the circadian oscillator. We examined the relationship between the neuropathology of Alzheimer disease, as modeled by an animal system,
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10. A recessive mutant of Drosophila Clock reveals a role in circadian rhythm amplitude
The transcription factor Clock (Clk) plays a critical role in animal circadian rhythms. Genetic studies defining its function have relied on two dominant negative alleles, one in Drosophila and one in mice. Here we describe a novel recessive allele of Drosophila Clock, Clkar. Homozygous Clkar flies are viable and behaviorally arrhythmic. The Clkar phenotype
Oxford University Press.
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11. Photoperiodic information acquired and stored in vivo is retained in vitro by a circadian oscillator, the avian pineal gland
Endogenous circadian rhythms have been described in a wide range of organisms from prokaryotes to man. Although basic circadian mechanisms at the molecular level are genetically fixed, certain properties of circadian rhythms at the organismic level can be modified by environmental conditions and subsequently retained for some time, even in organisms shi
The National Academy of Sciences.
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12. The Circadian Clock That Controls Gene Expression in Arabidopsis Is Tissue Specific1
The expression of CHALCONE SYNTHASE (CHS) expression is an important control step in the biosynthesis of flavonoids, which are major photoprotectants in plants. CHS transcription is regulated by endogenous programs and in response to environmental signals. Luciferase reporter gene fusions showed that the CHS promoter is controlled by the circadian clock both
American Society of Plant Physiologists.