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 18 of 18 for “"Effect of light on."”.
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The effect of light on a rat model of depression
Background: Depression is a debilitating mood disorder, negatively affecting an individual’s health and well-being. Despite this, the aetiology of depression remains poorly understood. Consistently, depression treatments are far from satisfactory due to limited efficacy and adverse side effects …
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Effect of light on the circadian activity rhythm of the slow loris, Nycticebus coucang
<p>In this study, the locomotor activity of a nocturnal prosimian, the slow loris (<em>Nycticebus coucang</em>), 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 …
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Adaptations of Terrestrial Isopods to Varying Wavelengths of Light
The problem. The purpose of this investigation was to determine the response of terrestrial isopods that were subjected to prolonged periods of varying wavelengths of light, and to measure this adaptability by locomotor activity. Procedure. Terrestrial isopods were randomly collected from their …
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Increased phenotypic plasticity linked to broader geographic range size in sunflower (Helianthus) species
… vulnerable rare species. Plant species can respond to environmental changes via adaptation and/or acclimation or migration, yet limited genetic diversity and fitness in rare species can hinder these processes. Changes in light availability from human activities impact the growth and fitness of …
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Characterising responses of the seagrass Posidonia Sinuosa to changes in light availability
The unrelenting threat of seagrass loss resulting from reduced light availability has motivated this characterisation of responses of Posidonia sinuosa Cambridge et Kuo to light availability and their application as monitoring tools. The study comprised of three major components: an assessment of …
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Accelerated, graft-based germplasm conservation of American chestnut (Castanea dentata) in the South
Asexual propagation through grafting is a low-tech, noninvasive method for conservation of rare American chestnut germplasm. Particularly when in situ conditions prevent trees from reaching sexual maturity, graft-propagation allows release from shade conditions and disease pressure to promote …
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The effect of photoperiod on the gonads and basophilic adenohypophyseal cells of the rough-skinned newt, Taricha granulosa granulosa
The function of light in the reproductive cycle in amphibians has not been extensively studied. However, Farner (1965) feels that the small amount of experimental evidence suggests that photoperiod may play a role in the testicular cycle of Rana esculenta. The purpose of this paper is to study the …
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A study of photoperiodic inhibition of flower development in Lemna Persusilla 6746
… perpusilla</i> 6746, a short day plant on Hutner's medium, is induced to flower by a single long night. Resulting flower primordia develop normally in short days but regress in unfavorable photoperiods such as long days or continuous white light. Flower development following a single …
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Adolescent sleep and the circadian pacemaker
Adolescence is a critical time of social, physical, and mental development. Adolescents often exhibit a circadian phase delay in which they tend to go to bed later and wake up later compared to adults. This thesis seeks to understand the adolescent phase delay and its relationship to the circadian …
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Shedding light on E. coli phototaxis
My thesis work has been focused on phototaxis response in E. coli. I will review the current state of knowledge on chemotaxis and phototaxis and discuss the motivation behind this project in Chapter 1. In Chapters 2 and 3, I will describe a high-throughput framework for studying phototaxis in …
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Heart rate and oxygen consumption during the critical prenatal period in chicken embryos (Gallus gallus): Influence of light cues and the onset of pulmonary ventilation.
… can be entrained in either heart rate or oxygen consumption in late stage embryos (days 17-19.5) with light as a zeitgeber, chicken embryos were incubated in complete darkness (D:D) and 12:12 light:dark cycle (L:D). Light had no impact on oxygen consumption (390 µL O2∙min-1∙egg-1) but increased …
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The Effect of General Anaesthesia on Circadian Rhythms in Mice
After GA (general anaesthesia), patients often report symptoms of circadian misalignment that can last up to five days. Animal studies have now demonstrated that GA may be, at least in part, responsible for these effects, causing timedependent shifts on circadian rhythms of behaviour, physiology, …
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Diurnal and stimulated astrocyte morphology dynamics in the rodent central nervous system
Cellular heterogeneity between brain regions has been attributed to differences in neurons, although differences between astrocytic glia of distinct brain regions are emerging. Relatively little is understood concerning heterogeneity in astrocyte structural dynamics between brain regions. The …
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Development of novel approaches to study Cuscuta campestris biology
… a host to complete its lifecycle. Parasite-host connections occur via an haustorium, a unique organ that acts as a bridge for the exchange of water, nutrients, macromolecules like mRNA, microRNA, and proteins, and microorganisms. Studies of Cuscuta spp. are challenging due to its dependence on the …
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The Antioxidant Function of Lutein in Controlling Photo-Oxidation of a Colloidal Beverage System
The effect of light on a model colloidal beverage system under two different test conditions, refrigerated storage (14 d, 4°C) and accelerated storage at room temperature (12 hr, 25°C), was investigated. The addition of lutein to provide protection against photo-oxidation of susceptible compounds …
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The role of redox oscillation in circadian physiology of the suprachiasmatic nucleus and hippocampus
The suprachiasmatic nucleus (SCN) of the hypothalamus is the master regulator of the circadian clock in mammals. It generates daily rhythms of behavior, metabolism, and other important physiological processes. Misalignment of this internal circadian clock with the external environment can lead to …
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CONTACT PRESSURE MEASUREMENT
The knowledge of the correct clamping force in a bolted joint is important in the prevention of leakage and in extending the life span of the joint. One of the methods to tighten the joints to the correct clamping force would be to use torque wrenches but this and other techniques do not indicate …