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 101 for “"Light exposure"”.
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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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The Effect of Acute Bright Light Exposure on Social Affiliation
In recent decades, bright light has emerged as a useful tool in numerous clinical and non-clinical applications, with the potential to influence circadian rhythms, sleep, mood, and several other functional domains. However, despite the existence of plausible neurological pathways through which …
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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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Influence of Light Exposure on the Melanopsin Driven Pupil Response and Circadian Rhythm
Exposure to increasing amounts of artificial light during the night may contribute to the high prevalence of reported sleep dysfunction. Release of the sleep hormone melatonin is mediated by the intrinsically photosensitive retinal ganglion cells (ipRGCs). ipRGCs signal environmental light, with …
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Hemispheric reactivity to bright light exposure: a test of the relationship between age, hemi-activation and depression
… the finding in a single-case study that ambient light and noise have a differential effect on behavior presumed to be representative of the left and the right cerebral hemispheres. The left hemisphere appears to be more responsive to ambient light level, with the right hemisphere being more …
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Light Transmission Properties of Lentil (Lens culinaris Medik.) Seed Coat and Effect of Light Exposure on Cotyledon Quality
… seed coat types and to determine the effect of light treatment, seed coat presence, and seed coat type on color loss in lentil cotyledon. Light transmission properties of seed coat types were obtained to find out if they differ in their light-blocking ability and protection of the underlying …
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Effect of shelf-life and light exposure on acetaldehyde concentration in milk packaged in HDPE and PETE bottles
… amber PETE, clear PETE, and clear PETE with UV light block and was exposed to fluorescent light of 1100-1300 lux (100-120 FC) at 4oC for 18 days. Sensory and chemical analysis and was done on milk from all containers over a period of 18 days. Emphasis was on oxidation, acetaldehyde and lacks …
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Studio dei ritmi circadiani in pazienti in stato vegetativo
… (VS) in basal condition and after nocturnal blue light exposure. Methods: Eight patients in VS underwent two experimental sessions of 48 consecutive hours polysomnography with body core temperature (BCT) measurement separated by a 1-week interval. For a week between the two experimental sessions, …
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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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Oxidation barrier and light protective packaging properties for controlling light induced oxidation in milk
Fluorescent light exposure has well documented negative effects on fluid milk through oxidation reactions. A shift to light-emitting diode (LED) lights in retail dairy cases has occurred due to increased energy efficiency, but the effects of LED light on fluid milk are not known. The objective was …
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Variations in Phenotypic Plasticity and Fluctuating Asymmetry of Leaf Morphology of Three Quercus (Oak) Species in Response to Environmental Factors
… (black oak). It was hypothesized that light exposure, individual trees, leaf position, and other leaf traits will influence variation in these species. Leaves were sampled from trees of these species and their morphological traits were measured. Absolute asymmetry of leaf width and area …
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Influence of light conditions on the dynamics of Tetranychus urticae and its control by the predatory mite Neoseiulus californicus
… This study investigates the impact of LED light exposure on the dynamics of the two-spotted spider mite (Tetranychus urticae) and its control by the predatory mite Neoseiulus californicus. Three light treatments were applied: natural light, 12h LED light and 12h dark, and continuous 24h LED …
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Multiphase Aging of Atmospheric Biomass Burning Brown Carbon
… on climate through their ability to absorb light, and potentially contributing to warming effects. Due to the expected increase of wildfire activity in the upcoming years, this source of particulate emission is also expected to increase. Oxidative and photochemical aging in the atmosphere, …
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Sleep, cardiometabolic health, and neurocognitive performance in esports players
… by unique behaviors, including prolonged exposure to blue light from electronic screens, extended periods of sedentary behavior, irregular sleep patterns due to late-night matches or competitions, and high levels of stress, all of which may be undertaken to improve or maintain their …
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Efficiency Improvement of Cross-Compound Parabolic Concentrator for Silicon and Dye-sensitised Solar Cells
… UV adhesive and evaluated under varying incident light angles and light exposure durations to study the electrical performance and thermal behaviour, respectively. A reflective film deposited by magnetron sputtering was applied to the escaping edges, which are positioned above the receiver edges …
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Development of new adaptive materials based on spiropyran molecular photoswitches
… merocyanine form (MC), i.e. SP → MC (UV light), MC → SP (green, white light). Furthermore, the MC form possesses a phenolate group that can reversibly bind metal ions and this ion binding is also photo-reversible, as when the MC-ion complex reverts to the passive SP form (upon green/white …
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The role of Biophotons in cellular senescence.
… intrinsic biophotonic emissions and extrinsic light exposure on cellular senescence. To achieve this, I developed, utilising doxorubicin (Dox), four different senescence models: two cancer (MCF7 breast and A549 lung) and two non-cancer cell lines (MCF10A breast and IMR-90 lung fibroblasts). …
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Investigation of Factors Influencing Niche Differentiation of Ammonia-oxidizing Archaea and Bacteria in Freshwater Environments
… concentration, oxygen concentration, pH, and light exposure). Data from these experiments indicated that ammonium and oxygen concentrations and light exposure, would be the strongest factors driving niche separation of AOA and AOB. Chemostat competition experiments were conducted using one …
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EFFECTS OF EXTERNAL FACTORS ON CONSUMER’S PERCEPTION OF FOOD
… discussed include the influence of environmental light exposure on the sensory quality of milk and soybean oil, the application of an artificial eating context to a consumption situation, delivered through virtual reality technology, and the influence of cues regarding health messaging on …
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Phototoxic target lipid model for predicting the toxicity of polycyclic aromatic hydrocarbons and petroleum to aquatic life
… PAHs and heterocyclic PAHs some of which absorb light in the ultraviolet light (UV) and visible (VIS) regions. The result is increased photo-enhanced toxicity, by a factor of two to greater than 1000 in the presence of light. -- The PAHs in petroleum differ in their properties, such as …
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