Circadian Rhythms
Mostrando 1-12 de 309 artigos, teses e dissertações.
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1. Genetic variations in circadian rhythm genes and susceptibility for myocardial infarction
Abstract Disruption of endogenous circadian rhythms has been shown to increase the risk of developing myocardial infarction (MI), suggesting that circadian genes might play a role in determining disease susceptibility. We conducted a case-control study on 200 patients hospitalized due to MI and 200 healthy controls, investigating the association between MI a
Genet. Mol. Biol.. Publicado em: 14/05/2018
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2. Night work and BMI: is it related to on-shift napping?
ABSTRACT On-shift napping can benefit night workers regarding sleep loss, synchronization of circadian rhythms, and alertness. However, few studies on napping can be found in the literature focused on possible health benefits. This cross-sectional study has investigated the role of on-shift napping on the association between night work and BMI in 409 night-s
Rev. Saúde Pública. Publicado em: 17/11/2017
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3. 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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4. 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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5. Changes in the suprachiasmatic nucleus during aging: implications for biological rhythms
Animals have neural structures that allow them to anticipate environmental changes and then regulate physiological and behavioral functions in response to these alterations. The suprachiasmatic nucleus of the hypothalamus (SCN) is the main circadian pacemaker in many mammalian species. This structure synchronizes the biological rhythm based on photic informa
Psychol. Neurosci.. Publicado em: 2013-12
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6. Biological rhythms and vector insects
The adjustment of all species, animals and plants, to the Earth’s cyclic environments is ensured by their temporal organisation. The relationships between parasites, vectors and hosts rely greatly upon the synchronisation of their biological rhythms, especially circadian rhythms. In this short note, parasitic infections by Protozoa and by microfilariae hav
Mem. Inst. Oswaldo Cruz. Publicado em: 2013
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7. Circadian rhythms in insect disease vectors
Organisms from bacteria to humans have evolved under predictable daily environmental cycles owing to the Earth’s rotation. This strong selection pressure has generated endogenous circadian clocks that regulate many aspects of behaviour, physiology and metabolism, anticipating and synchronising internal time-keeping to changes in the cyclical environment. I
Mem. Inst. Oswaldo Cruz. Publicado em: 2013
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8. Ontogênese do ritmo de consumo de oxigênio em operárias de Melipona quadrifasciata (Hymenoptera; Meliponini): a influência da luz / Ontogenesis of respiratory rhythms in Melipona quadrifasciata workers: the influence of light
As operárias de Melipona quadrifasciata exercem diferentes funções na colônia, segundo sua faixa etária. No interior da colônia, os indivíduos mais jovens, nutrizes, ficam localizados na região mais interna e aproximam-se progressivamente das regiões periféricas à medida que envelhecem. Os indivíduos mais velhos, forrageiras, saem da colônia dia
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/04/2012
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9. Daily anticipatory rhythms of behavior and body temperature in response to glucose availability in rats
When food is available recurrently at a particular time of day, several species increase their locomotion in the hours that precede food delivery, a phenomenon called food anticipatory activity (FAA). In mammals, many studies have shown that FAA is driven by a food-entrained circadian oscillator (FEO) that is distinct from the light-entrained pacemaker in th
Psychol. Neurosci.. Publicado em: 2012-12
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10. 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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11. 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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12. 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