Synchronized Oscillators
Mostrando 1-7 de 7 artigos, teses e dissertações.
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1. 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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2. Extração de contornos de figuras via sincronismo em redes de osciladores com acoplamento dinâmico
Uma variante do modelo de Kuramoto para osciladores de fase com acoplamento dinâmico é estudada. A intensidade do acoplamento é ajustada pela diferença de fases dos osciladores, de forma que a conexão é reforçada para osciladores sincronizados e enfraquecida para osciladores não sincronizados. As soluções de equilíbrio e suas estabilidades são ap
Publicado em: 2006
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3. Influência da auto seleção à luz no ritmo circadiano de atividade motora em Callithrix Jacchus / The influence of self-selection of light on motor activity circadian rhythm in Callithrix jacchus
Marmosets, Callithrix jacchus, are strictly diurnal animals. The motor activity rhythmicity is generated by the circadian timing system and is modulated by environmental factors, mainly by photic stimuli that compose the light-dark cycle. Photic stimuli can reset the biological oscilators changing activity motor pattern, by a mechanism called entrainment. Ot
Publicado em: 2006
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4. Expression of tobacco genes for light-harvesting chlorophyll a/b binding proteins of photosystem II is controlled by two circadian oscillators in a developmentally regulated fashion.
Light-induced expression of genes encoding the light-harvesting chlorophyll a/b binding proteins of photosystem II (Cab) was shown to be controlled by a circadian oscillator coupled to the red-light-absorbing plant photoreceptor phytochrome. Here we show that a red-light-insensitive oscillator is also involved in regulating the expression of the Cab genes. W
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5. Temperature-compensated circadian clock in the pineal of Anolis.
The pineal organ of the lizard Anolis carolinensis can be maintained for up to 10 days in superfused organ culture. During this time it synthesizes and releases melatonin into the medium flowing slowly over it. Collection of timed aliquots of medium and subsequent analysis for melatonin by radioimmunoassay reveal circadian rhythms of melatonin output by the
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6. New perspectives in brain information processing
Brain cortex activity, as variously recorded by scalp or cortical electrodes in the electroencephalography (EEG) frequency range, probably reflects the basic strategy of brain information processing. Various hypotheses have been advanced to interpret this phenomenon, the most popular of which is that suitable combinations of excitatory and inhibitory neurons
Springer Netherlands.
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7. Circadian Clock-Regulated Expression of Phytochrome and Cryptochrome Genes in Arabidopsis1
Many physiological and biochemical processes in plants exhibit endogenous rhythms with a period of about 24 h. Endogenous oscillators called circadian clocks regulate these rhythms. The circadian clocks are synchronized to the periodic environmental changes (e.g. day/night cycles) by specific stimuli; among these, the most important is the light. Photorecept
American Society of Plant Physiologists.