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.
Results
Showing 1 to 20 of 21 for “"light regime"”.
-
Study of Plasmonic Properties of the Gold Nanorods in the Visible to Near Infrared Light Regime
… behavior in the visible to near-infrared light range. Gold nanostructures exhibit a particularly strong plasmonic response for these wavelengths of light. In this study we have investigated optical enhancement and absorption of gold nanorods with different thickness using finite element …
-
The Photosynthetic Action Spectra of the Phytoplankton and Their Role in Governing Spatial and Temporal Distribution: A Numerical Modeling Approach
… carbon synthesis along various marine light regime gradients. A radiative transfer model taking into account both Rayleigh and Mie atmospheric optical properties is employed to define the light regime incident on the sea surface. The hydrospheric light regime is defined by an …
-
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 …
-
The Analysis of a Substrate Preference of PEROMYSCUS (Rodentia: Cricetidae)
… were encased in plastic and were under a normal light regime. When allowed a choice between an empty dark compartment and an empty lighted compartment exposed to a normal light regime, they preferred the darkened compartment I conclude that preference for the rocks is elicited by both the shading …
-
Visible and ultraviolet integrated photonics for addressing atomic systems
… has been given to applications in the visible light regime. This thesis is concerned with furthering the development of integrated photonics for controlling atomic systems, in particular individual trapped atomic ions. Nature places strict constraints on the frequency of the lasers used to …
-
PHOTOADAPTIVE RESPONSES IN THE TROPICAL BROWN SEAWEED, LOBOPHORA VARIEGATA (LAMOUR) WOMERS
… to determine if natural growth irradiance regimes influence the pigment content and/or photosynthesis-irradiance relationships of the tropical brown seaweed, Lobophora variegata. Pigment analyses were performed on samples collected from a series of depths between 9 and 49m. Chlorophyll a, …
-
Quality and Yield Responses of Seven Warm Season Forage Grasses to Partial Shading in a Simulated Silvopasture in East Texas
… simulated the quantity, quality, and overall light regime found beneath loblolly pine stands arranged for silvopasture. The forages selected for the study included ‘Tifton 9’ bahiagrass (<em>Paspalum notatum</em>), ‘Tifton 85’ bermudagrass (<em>Cynodon dactylon</em>), ‘Alamo’ switchgrass …
-
The role of forest stream corridor characteristics in influencing stream and riparian ecology
… utilised by many taxa. However, conversely, light regime was found to be fundamental in shaping production and community structure within these ecosystems. Consequently, here I explore a number of different trophic scale responses to riparian conditions in order to define the biotic responses …
-
Nanophotonics for tailoring light-matter interaction/
… nanophotonics phenomena which enable strong light-matter interaction. The first phenomenon is plasmonic resonance, where the surface plasmon mode at metal and dielectric boundaries significantly enhances the optical response of nanoparticles. We propose an optimization-based theoretical …
-
Characterization of the composition and activity of the photosynthetic apparatus in chloroplasts
The effect of growth light intensity on the photosynthetic apparatus of pea thylakoid membranes was investigated. Peas were grown either in a growth chamber at light intensities that ranged from 8 to 1050 $\mu$E/m$\sp2$ $\cdot$ s, or outside under natural sunlight. In thylakoid membranes the …
-
Characterizing ancient chemoclines through the use of pigment biomarkers and sedimentary stable isotope signatures
… of how depth, and by extension changing light regime, can affect microbial community structure and the production of light harvesting vs. photoprotective pigments. It was found that the concentration of the photoprotective pigment scytonemin and its abundance relative to that of …
-
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 …
-
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 …
-
Population Biology of the Tan Riffleshell (<I>Epioblasma florentina walkeri</I>) and the Effects of Substratum and Light on Juvenile Propagation
… μm; and mixed sediment, < 1400 μm) and two light treatments in open versus covered recirculating troughs (2.8 m). Juveniles in fine sediment substratum and covered troughs fared poorest, with 7% survival and growth to only 0.86 mm in length after 16 wk. Juveniles in mixed sediment and open …
-
Selective excitation of adsorbate vibrations on dissipative surfaces
… excitation in the ultraviolet / visible (UV/Vis) light regime ("vibrationally mediated chemistry"). For adsorbates on surfaces it has been theoretically predicted that IR preexcitation will lead to higher UV/Vis photodesorption yields and larger cross sections for other photoreactions. In a recent …
-
Some studies on the genus Acaena
… germination studies showed a warm day/cold night regime to be the most effective. A.magellanica seedlings grew at a much higher rate than those of A.tenera, but seedling production on a per head basis was similar for both species. Under a given light regime there was a linear rate of leaf …
-
The environmental and photo-physiological control of microphytobenthos primary production on an intertidal mudflat
… changes in the biomass of microphytobenthos. The light regime at each station was characterised by a model which combined the changes in daylight irradiance with the timing and duration of low tide. At the low shore stations total light availability during low tide was limiting in spring and …
-
Effects of artificial light at night on benthic primary producers in freshwaters
… worldwide, imposing an increase of nocturnal light levels and a disruption of natural cycles of light and dark that have been stable over geological and evolutionary time scales. This wide-spread alteration of the natural light regime by artificial light at night (ALAN) is contributing to …
-
Modeling gap dynamics, succession, and disturbance regimes of mangrove forests
… investigate the influence of natural disturbance regimes on the mangrove forest dynamics focusing in particular on the ecological role of disturbances, disturbance patterns, forest structure, succession behavior and long-term vulnerability evaluation. The study areas were set in the Indian River …
-
Exploring the Function of Cytochrome c6A
… background. Exposure to a harsh fluctuating light regime, named DISCO Light, in photomixotrophy was found to lead to a growth penalty in the absence of c6A. No other significant growth phenotypes could be observed in continuous light, continuous darkness, or milder fluctuating light regimes …
Page 1 of 2