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 28 for “"Light/dark Cycle"”.
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Effect of light on the circadian activity rhythm of the slow loris, Nycticebus coucang
… was monitored under an experimentally varied light regime. During the process of reversing their day-night cycle, activity was monitored for a light-dark cycle roughly correlating to the external day-night, a free-running period in total darkness followed by a reversed day- night light …
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Circadian desynchrony in the mouse: how does chronic exposure to rotating shift work-like patterns of light/dark affect circadian rhythms and neurobehavioural outcomes
… system entrains to alternative sleep/wake cycles such as those found in shift work schedules or what the resulting physiological and neurobehavioural changes as a result of a round-the-clock activity regime might be. The present study examines male CD-1 mice treated with three different …
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Circadian and Circatidal Rhythms of Protein Abundance in the Intertidal Mussel Mytilus californianus
… that fluctuates 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 …
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Integrated Entrainment of the Suprachiasmatic Clock by the Two Neurotransmitters of the Retinohypothalamic Tract, Glutamate and PACAP
… phase advance in the SCN slice as well as the light-induced phase advance in vivo. In the early night, PACAP enhanced Glu-induced delay while PACAP antagonists inhibited it. Anti-PACAP reagents also decreased the basal level of cAMP suggesting a tonic release of PACAP. Thus, through the …
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Primary Factors Affecting Growth of Microalgae Optimal Light Exposure Duration and Frequency
… the same time optimize the land use, the optimal light exposure duration and frequency are important factors in the design a photobioreactor which contained two parts was tested. One part of the PBR was exposed to the light, while another part of the PBR was placed underground without light. …
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The role of the intergeniculate leaflet in the circadian response to light
… for synchronization of rhythms to environmental light-dark cycles. In contrast, although the IGL is strategically located to convey light information to the SCN, a role for the IGL in photic entrainment has not been established. IGL-lesioned hamsters have been shown to entrain normally to …
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Insect Faunal Succession and Development of Forensically Important Flies on Deer Carcasses in Southwest Virginia
… conditions were 30" C, 75% RH and 14:10 hour light dark cycle. Significant differences in lengths of 3rd instar and combined overall maggot lengths were found for maggots reared on the different meat sources. Mean adult weights and wing lengths of venison-reared flies were significantly …
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Connecting the Circadian Clock with Chemosensation
… daily changes in its external environment, e.g., light-dark cycle. A resettable timekeeping mechanism called the circadian clock internally drives these cyclical changes with a ~24 hour period. Using electrophysiological, behavioral and molecular analyses, I tested where and how these two …
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Effect of Food Restriction on Serum and Pineal Indoles
… determined in adult male Wistar rats. Under a lighting regimen of 14 h light and 10 h dark, 3 weeks of 50% food restriction led to a reduction in 24 h mean serum tryptophan and serum serotonin levels but an increase in serum melatonin levels. The duration of the night-time melatonin rise was …
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Exteroceptive and Interoceptive Stimuli in the Contextual Control of Behavior by Circadian Rhythm in Mice
… 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 used renewal/reinstatement preparations to 1) determine if circadian rhythm could serve as a context for …
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Early Life Circadian Rhythm Disruptions Alters Brain and Behavior in Adulthood
… sleep/wake rhythms were impaired with disrupting light-dark cycle imposed the day of birth until weaning. At around 3 months of age, animals were evaluated on executive functioning (i.e., series of behavioral tests to assess anxiety level, spatial memory, and working memory), circadian …
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Low Dose, Low Disturbance: PET and PLA Microplastics Show Limited Effects on Soil Microbes via PLFA Analysis
… exposed a set of microcosms to a diurnal light/dark cycle while another set was held under continuous dark conditions. Phospholipid fatty acid (PLFAs) biomarkers were used to identify and evaluate soil microbial biomass and community composition in the presence and absence of plastics. In …
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Mathematical Modeling of Circadian Rhythms in Drosophila melanogaster
Circadian rhythms are periodic physiological cycles that recur about every 24 hours, by means of which organisms integrate their physiology and behavior to the daily cycle of light and temperature imposed by the rotation of the earth. Circadian derives from the Latin word circa "about" and dies …
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ECOLOGICAL AND PHYSIOLOGICAL MECHANISMS OF BIOLOGICAL RHYTHMS IN A POLAR-BREEDING SEABIRD
… circle, the primary timing cue, the geophysical light-dark cycle, is highly attenuated or absent, yet some animals will exhibit diel rhythms of behavior and physiology under these conditions. How and why diel rhythms persist under this ‘polar day’ remains to be fully explored. This work builds on …
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The Aerobic Metabolism and Behavior of the Burrow-dwelling Mantis Shrimp, HEMISQUILLA ENSIGERA CALIFORNIENSIS
… The animals were maintained under a 1OL:140 light-dark cycle and monitored on a 24-hour basis using a time-lapse video recorder. Infrared lamps were used for observations within the burrow and at night. Metabolic rates, as a function of oxygen tension, were measured in respirometry chambers …
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Plant-Like Cryptochrome Does Not Promote Blue Light-Induced Resetting of the Circadian Clock in <i>Chlamydomonas Reinhardtii</i>
… upon environmental time cues such as the daily light/dark and temperature cycles. The unicellular green alga <em>Chlamydomonas reinhardtii</em> is a useful model organism for circadian clock research. It shows several well-characterized circadian rhythms of behavior, and the monitoring of its …
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The effect of a tryptophan-depleted diet on voluntary exercise in mice
… was monitored every 12 hours corresponding to a light/dark cycle. An analysis of this data revealed a significant post-test rise in the activity levels of the mice in group EW compared to the activity of group CW. The wheel revolutions per 24 hours dropped by 17% in group CW while group EW’s …
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Circadian Secretion of Glucagon-like Peptide-1
… to pre-defined environmental changes, mainly the light-dark cycle. Interestingly, metabolic tissues, which have been found to express cell-autonomous clocks that are entrained by food intake, are largely responsible for establishing diurnal metabolic homeostasis. The incretin hormone glucagon-like …
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Molecular and Genetic Analysis of Neuropeptide Signalling in Mammalian Circadian Timekeeping
… an adaptive phase relationship with the light-dark cycle via projections from the retina. Intercellular communication between SCN clock neurons synchronises their oscillations, resulting in coherent output signals to the periphery. Vasoactive intestinal peptide (VIP), a neuropeptide …
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The interdependent regulation of photosynthesis and the circadian clock in wheat
… and behavioural processes with the natural light dark cycle. Synchronisation between the circadian clock and environment in plants provides a fitness advantage (Dodd et al. 2005) and in wheat several circadian clock genes are candidates for flowering time QTLs. In Arabidopsis a number of …
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