Cyclic Rhythms
Mostrando 1-10 de 10 artigos, teses e dissertações.
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1. 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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2. Influence of scheduled restricted feeding on reentrainment of motor activity rhythm after a 6-h light-dark advance in rats
Circadian rhythms are entrained to cyclic environmental cues such as the light-dark cycle and food availability. The suprachiasmatic nucleus of the hypothalamus is the main circadian oscillator in mammals and is entrained primarily by the light-dark cycle, although in some experimental situations food availability can affect its oscillation. Here we tested w
Psychology & Neuroscience. Publicado em: 2011-12
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3. O ciclo do tempo : processos de composição
Este trabalho apresenta os procedimentos composicionais das peças Murlidhar, Mahakal, Miniatura e O ciclo do tempo. Sendo esta ultima a principal, devido as ferramentas composicionais terem sido experimentadas com maior liberdade. As peças deste projeto utilizaram mitos e ritos do hinduísmo e conceitos da filosofia do Raja Yoga como motivadores para a ima
Publicado em: 2010
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4. DAILY RHYTHMS IN HEPATIC POLYSOME PROFILES AND TYROSINE TRANSAMINASE ACTIVITY: ROLE OF DIETARY PROTEIN
Hepatic polysome profiles vary in untreated rats as a function of time of day. The ratio of polysomes to total ribosomes increases from 50 to 73 per cent in darkness. There is also a daily rhythm in tyrosine transaminase activity which resembles but does not coincide with the polysome rhythm. Both rhythms are dependent on the cyclic ingestion of dietary prot
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5. Role of Cyclic mPer2 Expression in the Mammalian Cellular Clock
To explore the role of mPer2 in the circadian oscillation in the mammalian cellular clock, we established fibroblast cell lines in which expression of mPer2 is controlled through a tetracycline-regulatable promoter. We revealed that constitutive expression and overexpression of mPer2 mRNA severely impair serum shock-induced cyclic circadian clock gene expres
American Society for Microbiology.
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6. Circadian rhythms of melatonin release from individual superfused chicken pineal glands in vitro.
The pineal gland of birds contains one or more circadian oscillators that play a major role in overall temporal organization. We have developed a flow-through culture system for the isolated pineal by which we can measure the release of melatonin continuously from superfused glands over long periods of time. Chicken pineals release melatonin rhythmically, an
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7. Circadian secretion of cortisol and melatonin in cluster headache during active cluster periods and remission.
The cyclic nature of cluster headache warranted a study of the 24-hour rhythms of serum cortisol and melatonin. They were both altered during cluster periods as compared with periods of remission and healthy controls. The 24-hour mean and maximal cortisol levels were higher and the timing of the cortisol minimum was delayed as compared to the same patients i
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8. The Mechanism of Rhythmic Ethylene Production in Sorghum. The Role of Phytochrome B and Simulated Shading1
Mutant sorghum (Sorghum bicolor [L.] Moench) deficient in functional phytochrome B exhibits reduced photoperiodic sensitivity and constitutively expresses a shade-avoidance phenotype. Under relatively bright, high red:far-red light, ethylene production by seedlings of wild-type and phytochrome B-mutant cultivars progresses through cycles in a circadian
American Society of Plant Physiologists.
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9. Photoperiodic Effects on the Emanation of Volatiles from Alfalfa (Medicago sativa L.) Florets 1
Alfalfa (Medicago sativa L.) plants acclimated to photoperiods of 18 hours light, 6 hour dark in plant growth chambers exhibited a daily cyclic pattern of floret volatile emanation with a maximum emanation of about 6.5 nanograms of hydrocarbons/floret·30 minutes. This maximum was reached about 6 to 8 hours into the light period. After 8 hours of light, eman
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10. cGMP induces phase shifts of a mammalian circadian pacemaker at night, in antiphase to cAMP effects.
The suprachiasmatic nuclei (SCN) of mammals contain a circadian clock that synchronizes behavioral and physiological rhythms to the daily cycle of light and darkness. We have been probing the biochemical substrates of this endogenous pacemaker by examining the ability of treatments affecting cyclic nucleotide-dependent pathways to induce changes in the phase