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 25 for “"light regimes"”.
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Chronic toxicity of phthalates, biphenol and a Canadian bottled water stored under different light regimes using the Cnidarian Hydra Viridissima©
… water was analyzed over four months (stored in light and dark conditions) along with lab water similarly stored in glass, polycarbonate and polyethylene bottles. Following 2, 4, 8 and 16 weeks in each of the two treatments, hydra bioassays were conducted. Chronic toxicity tests were also …
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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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Stomatal acclimation to dynamic light: implications for photosynthesis and water use efficiency
… at global scales. Plant acclimation to growth light environment has been studied extensively; however, the majority of these studies have focused on constant light intensity and photo-acclimation, with few studies exploring the impact of dynamic growth light on stomatal acclimation and …
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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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Photoprotection and chloroplast regulation in the green algae Chlamydomonas reinhardtii
Absorbed light energy in excess of a cell's photosynthetic capacity can lead to production of reactive oxygen species (ROS) causing cell damage and death. Plants and algae have evolved conserved photoprotective responses that, at the level of light harvesting, are collectively measured as …
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The effects of intermediate-scale wind disturbance on forest composition, structure, and succession with implications for management
… and compare canopy structure, understory light regimes, woody species composition, and species diversity along a gradient of canopy disturbance and to analyze the influence of intermediate-scale disturbance on the successional trajectory of an upland hardwood forest. We found no …
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Canopy, microenvironment, and nitrogen effects on summer recovery of tall fescue
… heights with a seventh unmowed check. Canopy light regimes, leaf area index, and regrowth of tillers were monitored along with soil, fair, and shoot temperatures in stubbles after the June harvest. Mowing more frequently in spring decreased canopy yields of the June harvest, but increased leaf …
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Glycerol from novel strains of halophytic microalgae
… exposed to salinity stress under continuous light or dark regimes. (c) Maximize glycerol recovery from microalgal cultures using novel supercritical carbon dioxide (SC-CO2) extraction technology. Dunaliella and Asteromonas strains were shown to withstand large variations in the salinity of …
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Mechanisms determining the coexistence of open- and closed-canopy biomes
… environments tend to be fire-prone with higher light, but lower nutrient and water availability than closed environments. Environmental heterogeneity could select for divergent floristic assemblages and adaptive traits, from which emergent differences in resource availability and fire incidence …
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Level of UV-B Radiation Influences the Effects of Glyphosate-Based Herbicide on Fitness of the Spotted Salamander
… conditions that reflect open and closed canopy light regimes. Larval salamander responses to glyphosate-based herbicide varied depending on UV-B conditions. In general, it appears that an open canopy (i.e. greater UV-B exposure) may confer fitness benefits. In the presence of herbicide, survival …
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The Influence Of The Circadian Clock On Stomal Conductance And Carbon Assimilation In Arabidopsis thaliana
… with fixed external signals, such as the light intensities at dawn and dusk. This study investigated the influence of the circadian clock on stomatal conductance and carbon assimilation and the decoupling of these processes. Timing of Cab (TOC1) and Circadian Clock Associated 1 (CCA1) …
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Documenting the association between a non-geniculate coralline red alga and its molluscan host
… designed under both fluorescent (rich in blue light) and incandescent light (rich in red light) to ascertain whether the coralline had a preference for O. sinensis over the similar O. tigrina. This experiment was inconclusive as no recruitment was obtained under either of the light regimes. A …
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Recovery of southern Appalachian streams from historical agriculture
… agricultural streams) had higher temperatures, light inputs, nutrients, and suspended sediments than forested streams and contained smaller substrate, dominated by sand and silt. Temperature and light regimes recovered in streams of reforested catchments, but the other aspects of stream …
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Changes in climate and catchment processes over the middle and late Holocene in the boreal region of northeastern Ontario, Canada
… studies. This thesis also examines the role of light attenuation in structuring modern diatom assemblages within lakes. Diatoms collected from surface sediments in depth-gradient transects suggest that light attenuation is a strong driver of benthic-planktonic (B:P) assemblage separation …
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Photoprotective role of beta -carotene and antioxidant enzymes: A shield against ultraviolet damage in Dunaliella bardawil
… to high red (wavelengths > 590 nm) or blue light (390-540 nm; 150 mumol photons·m -2·s--1), ultraviolet-A (320-400 nm) or ultraviolet-B (290-320 nm), independently, for 24 hour test periods. Ascorbate and glutathione concentrations, ascorbate peroxidase activity, photosynthetic …
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Termitophile encounter may be costly to the termite host
… we additionally check the effects of cold white lights and infrared lights on termites survival. The results showed that the termitophile presence was costly to termites, reducing their survival, while the termite presence was beneficial to the beetles delaying their time until death. …
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Seeing the light: germination, growth and flowering responses in wildflowers under artificial nighttime lighting
The introduction of artificial nighttime lighting due to human settlements and transport networks is increasingly altering the timing, intensity and spectra of natural light regimes worldwide. Artificial light at night (ALAN) is predicted to constitute a significant anthropogenic pressure on …
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Restoration through reassembly: evaluating the role of native plants in combatting Chinese tallow
… hereafter tallow, across different flooding and light regimes, I investigated how restructuring native communities with valuable native species will prevent the reestablishment of tallow. I studied the changes in morphological and physiological traits of tallow when growing with water tupelo …
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Efficient Use of Photons in a Photobioreactor
… be developed, three main elements of the system (light, photosynthetic microorganism and nutrients) need to be optimized incorporating concepts from multiple disciplines. This dissertation deals only with one main element, light optimization. To understand light optimization, an understanding of …
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Characterization of Alternaria alternata isolates causing brown spot of potatoes in South Africa
… to understand the extent to which different light regimes influence radial growth, sporulation and pathogenicity of this pathogen. The role of low temperatures on initial sporulation was also investigated. Exposure of isolates to low temperatures (4°C) in the dark increased number of spores …
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