Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 22 for “"Circadian cycle"”.
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Protein localization during the cyanobacterial circadian cycle
Circadian clocks are ubiquitous throughout the living world. Of these circadian clocks, the simplest one is found in cyanobacteria - unicellular, photosynthetic marine organisms. Studies of the circadian clock of Synechococcus Elongatus PCC 7942 have shown that the circadian clock is independent of …
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Biochemical and Structural Studies of the Role of FKBP(L)s in the fly and Mammalian Circadian Cycle
… molecular trafficking, RNA splicing and cell cycle regulation among others. Bride of Doubletime (BDBT) previously designated as CG17282 in the flybase was identified as a circadian clock component that stimulates DBT’s circadian function. Here, we have used biochemical and structural …
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CHARACTERIZING INTRA-ANNUAL XYLEM CELL FORMATION AND CIRCADIAN CYCLE DYNAMICS OF JACK PINE (PINUS BANKSIANA) IN THE NORTHERN BOREAL FOREST, YELLOWKNIFE, NORTHWEST TERRITORIES
Xylem cell formation and stem radial fluctuations for jack pine in Yellowknife, NT were assessed during the 2017 season. The characterization of the timing of the onset of xylogenesis reactivation, period(s) of rapid cell development, and termination of seasonal stem growth were recorded over the …
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Regulation of Adaptive and Innate Immunity by the Circadian Transcription Factor NFIL3
The day-night cycle has a profound impact on animal physiology, which has been shown to be mediated by an intracellular timing system called the circadian clock. However, little is known about whether and how the day-night cycle and the circadian clock influence host immunity. Here, I show that the …
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Circadian, Light and Low Temperature Regulation of Nitrate Reductase in Tomato
… novo transcription regardless of the time in the circadian cycle that the chilling episode is initiated causing an increase in both NR protein and activity. The untimely depletion of reductant and TCA carbon skeletons as well as accumulations of toxic byproducts of nitrogen assimilation that this …
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Genetic Studies on the Circadian Clock in the Model Organism Drosophila Melanogaster
… the basic neural mechanism that regulates circadian behavior in Drosophila is known in quite some detail, several aspects of this biological process still remain to be elucidated. In this study a variety of genetic and molecular approaches was used to identify and characterize genes that …
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Exteroceptive and Interoceptive Stimuli in the Contextual Control of Behavior by Circadian Rhythm in Mice
… (stimulation from organisms' own bodies). Circadian rhythm (patterns of physiological activity and behavior organized around approximately 24-h cycles) is an important factor in determining behavior, and it is comprised of both exteroceptive and interoceptive stimulus factors. This study …
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Daily Temperature Rhythm in Hospitalized Female Patients
… with replacement therapy affect the thermal circadian cycle. Previous studies indicated that the temperature peak occurs in afternoon or early evening, but there were no investigations to determine if aging, sex, or menopause affects the temperature cycle.</p> <p>The sample included 62 female …
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Spring Forward or Fall Back? Redox State as a Determinant in Glutamate Signaling Pathways Adjusting Our Brain Clock
… nucleus (SCN) of the hypothalamus is the master circadian clock in mammals. Nocturnal light, acting via neurotransmitter glutamate, synchronizes this clock to changes in the external environment by adjusting the phase of the SCN. The phase-resetting response depends on the temporal state of the …
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Multiscale, multiparadigm metabolic modeling of the keystone diazotrophic cyanobacterium, Trichodesmium erythraeum
… carbon, nitrogen, and phosphorus biogeochemical cycles. It ties these models to experimentation, both personally conducted and from literature, anchoring the findings to biological reality and determining the needs of the field. It progresses to generate a MultIscale MultiObjective Systems …
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Effect of Melatonin and Dopamine in Site Specific Phosphorylation of Phosducin in Intact Retina
… in the retina vary reciprocally during the circadian cycle, with dopamine high during the day and melatonin high during the night. Together, they control numerous aspects of light and dark adaptation in the retina. In this study, we have investigated the possible roles of dopamine and …
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Action Spectrum for Photoentrainment of the Circadian Clock in Wild-Type <i>Chlamydomonas reinhardtii</i>
<p>The circadian clock is an endogenous timer that oscillates with a period of approximately 24 hours and is reset upon environmental time cues such as the daily light/ dark or temperature cycles. <em>Chlamydomonas reinhardtii</em> is an ideal model organism for research on the circadian clock, …
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Circadian and Circatidal Rhythms of Protein Abundance in the Intertidal Mussel Mytilus californianus
… with the 12.4-h tidal and 24-h light/dark cycle to predictably alter food availability, temperature, air exposure, wave action, oxygen partial pressure, and osmotic conditions. Intertidal sessile bivalves exhibit behavioral or physiological changes to minimize the persistent challenges of …
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Cells, circuits, and development of the mouse lateral geniculate nucleus
… its influence on programming an individual's circadian cycle, mood disorders, fear perception, and perception and interaction with the environment. We employed state-of-the-art single-nucleus sequencing to identify a comprehensive list of cells in both dLGN and vLGN. Using this knowledge, we …
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Is there a role for NF-κB in the suprachiasmatic circadian clock?
Circadian rhythms are recurring patterns in behavioural, physiological, and other parameters that display periods of approximately every twenty four hours. The molecular basis of the circadian timekeeping involves clock genes which act as transcription factors in a serious of feedback loops. …
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Functional investigation of PERIOD in the mammalian circadian clock
Circadian rhythms are cell-autonomous biological oscillations with a period of approximately 24 hours. They are observed across all kingdoms of life and allow the organisation of physiology to anticipate and accommodate the different environmental and energetic demands of day and night. In human …
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The cortisol awakening response: neuropsychological correlates and implications for function in healthy humans
… cortisol secretory activity shows a marked circadian rhythm. This rhythm is characterised by a declining pattern across the day, reaching a nadir in the late evening and early part of sleep, before gradually increasing during late sleep to reach peak levels upon subsequent morning awakening. …
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IDENTIFICATION OF LOCI CONTRIBUTING TO THE SMITH-MAGENIS SYNDROME-LIKE PHENOTYPE AND MOLECULAR EVALUATION OF THE RETINOIC ACID INDUCED 1 GENE
… in development, neurological function, and circadian rhythm. Using a ChIP-chip based approach we identified 257 transcripts we believe RAI1 regulates. Following up on these transcripts, using in vitro and in vivo methods, we have been able to conclude that RAI1 is a positive regulator of …
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Acer, a homologue of the human angiotensin-1 converting enzyme, modulates the response of sleep, glycogen storage, lifespan, fecundity and stress resistance to diet in Drosophila melanogaster
… enzymes in dietary effects on ageing-related and circadian health, function and metabolism we are studying ACER, a homologue of human ACE, in the fruit fly Drosophila melanogaster. Previous studies (Taylor, et al., 1996; Carhan, et al., 2010) have shown that Acer is expressed in the embryonic …
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Investigating Transcription Factor Networks That Drive Biological Clocks and Oscillators
… to test in the laboratory. The 24-hour</p><p>circadian rhythm and the approximately 75-minute cell cycle of a budding yeast cell are</p><p>both examples of dynamical processes that contain precisely ordered events, repeating</p><p>over each cycle. Organisms utilize such biological clock …
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