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 21 for “"dim light"”.
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A very dim light, a very steep hill: women in the Victorian Branch of the Australian Labor Party
This thesis presents a contemporary approach to the problem of the lack of recognition of women in Australian society and politics using the Australian Labor Party (ALP) as background and the Victorian Branch of the Australian Labor Party as a test case. It examines the paradox that women have had …
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The Effects of Low Intensity Ambient Lighting on Refractive Development in Rhesus Monkeys (Macacca mulatta)
PURPOSE: Elevated ambient lighting levels protected animals from certain forms of experimental myopia, suggesting that alterations in ambient lighting levels influence refractive development. The purpose of the studies reported in this dissertation was to evaluate the extent to which low ambient …
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Light-At-Night and Mood: Examining The Role Of Sex In C57Bl/6 Mice
… and it has recently been postulated that dim nocturnal light may contribute to depression symptoms in humans and in rodents. Sex is also a very important factor in affective disorders, with prevalence rates of major depression twice as high in females than in males. We set out to test the …
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Evolution and functional specializations in nocturnal environments: insights from visual pigments in Chiroptera
… initiated through activation of visual pigments, light-sensitive complexes expressed in photoreceptor cells in the retina that have been shown to evolve in response to changes in ecology and light environment. In this thesis, I employ molecular evolutionary analyses and experimental …
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Molecular Evolution and Functional Characterization of the Visual Pigment Proteins of the Great Bowerbird (Chlamydera nuchalis) and Other Vertebrates
Visual pigments are light sensitive receptors in the eye that form the basis of sensory visual transduction. This thesis presents three studies that explore visual pigment proteins in vertebrates using a number of computational and experimental methods in an evolutionary framework. The objective is …
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Visual Opsin Diversity in Anurans
… sensitivity of visual pigments and thus alter dim-light and color vision. Some of the amino acid changes observed are known to tune spectral sensitivity in other vertebrates, and tests for positive selection revealed additional candidate tuning sites in LWS. The observed variation cannot fully …
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Methods for monitoring the human circadian rhythm in free-living
… is influenced primarily through exposure to light. A direct pathway from the eyes to the suprachiasmatic nucleus, where the circadian clock resides, is used to synchronise the circadian clock to external light-dark cycles. In modern society, with the ability to work anywhere at anytime and a …
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Aptamer-Based Detection of Salivary Melatonin for Circadian Rhythm Sleep Disorders Monitoring
… (which lack objectivity), and/or on dim light melatonin onset tests (which are costly, cumbersome, and lack sensitivity), thereby leaving a lot to be desired. Salivary melatonin profiling can serve as a cost-effective and convenient method for diagnosing circadian rhythm sleep …
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PHYSIOLOGICAL CONSEQUENCES OF CIRCADIAN DISRUPTION BY NIGHTTIME LIGHT EXPOSURE
… circadian rhythms which are synchronized to this light/dark cycle. In recent years, daily light schedules have become artificial and irregular due to the use of electric lighting. In this dissertation, I propose that exposure to light at night (LAN) disrupts the circadian system altering …
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True Real Time Pose Independent Face Detection Using Color Information and Skin Region Segmentation
… illumination conditions such as bright sunlight, sufficient light, and dim light conditions, and different orientations of the individuals in the videos were gracefully handled by the system. The time taken to detect and store the normalized faces was comparable to the length of the video …
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Factors Affecting Epithecal Growth Lines in Four Coral Species, with Paleontological Implications
… <p>The number of growth lines formed during light-dark cycles of 16, 24 and 32 hours were compared for M. annularis, M. cavernosa, Porites astreoides and Tubastrea aurea. The variability among colonies from the same species was in many cases more significant than that among light treatments. …
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From Furnace to Fairness: Atmospheric Sequences in Steel Museum Spaces
… by hazardous conditions, limited natural lighting, and uncomfortable indoor temperatures. Visitors are transported to the 19th-century factory workers' world, experiencing the dim light from above, sweltering heat, dirt on the ground, and the large scale of the production space. This …
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Being in the right place at the right time : time of day discrimination by pigeons, Columba Livia
… mechanisms underlying the timing behaviour. Lights-on time was shifted back by 6 hr and no decrease in performance was found during the first session following this phase shift. This finding rules out an interval timer and suggests that a circadian type of timing mechanism, with a …
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Organization of the Clare-Bishop Area of Cat Visual Cortex (Extrastriate)
… findings suggest that the MIN is related to dim light vision. (ii) Associational input from area 18 is organized into a stripe-like pattern of inputs to the Clare-Bishop area that is under control of layer A. The influence of the MIN appears to be maximal in an interdigitating series of …
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Impulsivity and Sleep and Circadian Rhythm Disturbance as Interactive Risk Factors for Bipolar Disorder Mood Symptom and Episode Onset: Evidence from an Ecological Momentary Assessment (EMA) Study
… symptoms. Interaction analyses suggested that dim light melatonin onset time, total sleep time, and sleep onset latency moderated the relationship between impulsivity and mood symptoms (both next-day and at 6-month follow-up). Results are discussed in terms of their contribution to the existing …
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Causes and consequences of patchy spatial distribution in male and female fairy shrimp, Eubranchipus bundyi
… data, suggest E. bundyi may be attracted to dim light and seek shade and structure within the water column (vegetation, sticks, roots, the bases of trees, rocks, etc.) when light levels are high. At midday, fairy shrimp seem to cluster among shaded structured regions of the pond; for …
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Sun-compass orientation in the treefrogs, Hyla crucifer and Pseudacris triseriata triseriata
… skies after ten days of constant temperature, dim-light conditions in the laboratory did not orient (n=10, p >0.10).Adult chorus frogs captured as they left the breeding pond and tested under sunny skies did not orient on the Y-axis of the nearest shoreline (n=33, p >0.10), and neither did …
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Measuring college students' sleep, stress, mental health and wellbeing with wearable sensors and mobile phones
… sleep and GPA, and provided a measure of dim light melatonin, enabling circadian phase to be measured. To investigate the value of the data, I examined a subset of the large set of questions that these new data enable us to answer: I examined the associations between sleep regularity and …
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Vision and Bioluminescence in Cephalopods
… among animals are potentially continuous. The light environment in the midwater habitat is highly structured due to light scattering and absorption. Downwelling sunlight becomes exponentially dimmer, bluer, and more diffuse with depth. This optical structure means that an animal’s depth and …
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PERIOD3 variable number tandem repeat genotype associations with performance, injury, illness and re-entrainment
… might explain individual sensitivity to bright light and has been reported to be associated with sleep pressure- an increase in the brain's pressure and need for sleep, following an extended period of awakening. Individuals homozygous for the longer variant of the gene (i.e. PER3⁵⁄⁵) experience …
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