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 72 for “"day & night"”.
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Day-night and energy variations for maximal neutrino mixing angles
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Physics, 1999.
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Individual Differences in Preschool Aged Children's Inhibitory Control: Adding Borders to the Day/Night Task
… thesis study, I added a mixed condition to the day/night inhibitory control task in preschool children using methodological design features from the Dimensional Change Card Sort (DCCS) Task. This addition allowed the day/night task to serve as a better analogue to the Stroop task, which is an …
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Structural dynamics of community gene expression In a freshwater cyanobacterial bloom over a day-night cycle
… cyanobacterium Microcystis aeruginosa over a day-night cycle. Cyanobacterial blooms are a major problem in eutrophic lakes and reservoirs, negatively impacting the ecology of the water body through oxygen depletion upon bloom decay and in some cases through production of toxins. Waterborne …
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Mechanisms Controlling Day/Night Changes in CAM Tissue Volume, With a Focus on the Kansas Cactus, Opuntia macrorhiza
Day/night changes in organs volume of Crassulacean Acid Metabolism (CAM) plants have been observed. The objective of this study is to determine the most important mechanism that controls day/night changes of organ thickness in CAM plants. In this study, day/night changes in organ volume and morning …
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Effect of light on the circadian activity rhythm of the slow loris, Nycticebus coucang
… 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 regime.</p> <p>Under constant conditions an endogenous …
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Evaluation of physiological and morphological basis for drought resistance in maize and sorghum
… under constant environmental conditions (12/12h day/night, 28-32/17 °c day/night temperature, 60-80% RH and PPFD of 1200-1400 umol m-2 S-1), at the Department of Botany, University of Cape Town.
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THERMAL FATIGUE DAMAGE OF ASPHALT PAVEMENT
… at the surface. Like traffic loading, repeated day-night temperature cycle causes damages in AC. Damage due to a single day-night temperature fluctuation may be small. However the accumulated damage due to a large number of day-night temperature cycles may not be small. In this study, fatigue …
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Regulation of (1,3;1,4)-beta-glucan synthesis in barley (Hordeum vulgare L.) endosperm and leaf tissues.
… is re-synthesized upon re-exposure to a normal day/night cycle. Thus, to investigate the regulation of leaf (1,3;1,4)-β-glucan, the transcript levels of (1,3;1,4)-β-glucan synthase genes and related genes were profiled during (1,3;1,4)-β-glucan mobilization upon dark incubation. Some of the …
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Coordination of the Arabidopsis thaliana circadian clock
… circadian clock, that times key processes to the day-night cycle. These clocks are aligned to the day-night cycle by multiple environmental signals that vary across the plant. Thus, the clock may be set separately in cells creating discrepancies in timing. However, cells and tissues often must act …
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Structural and functional heterogeneity of cells in the rat hippocampus
… coming into the DG. Additionally, time-of-day significantly influences hippocampal neuronal excitability and functions in both CA1 and DG, including long-term potentiation, memory acquisition, and recall of learned tasks (Chaudhury et al., 2005). However, mechanisms underlying these diurnal …
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Regulation of Adaptive and Innate Immunity by the Circadian Transcription Factor NFIL3
The day-night cycle has a profound impact on animal physiology, which has been shown to be mediated by an intracellular timing system called the circadian clock. However, little is known about whether and how the day-night cycle and the circadian clock influence host immunity. Here, I show that the …
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Transplantation of the Mammalian Pineal Gland: Studies of Survival, Revascularization, Reinnervation and Recovery of Function
… abundant in some regions than in others.</p> <p>Nighttime serum melatonin levels increased significantly in pinealectomized rats with transplants into either the third cerebral ventricle or the anterior eye chamber. This increase might reflect graft reinnervation. Yet day-night differences in …
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Individual Differences in Inhibitory Control Skills at Three Years of Age
… In contrast, performance on two other IC tasks, Day-Night and Less is More, was not related to measures of language or frontal EEG, perhaps because children performed at chance level on these tasks, indicating that these tasks may be too difficult for 3-year-old children. Implications of these …
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Sferic propagation in the cutoff region of the earth-ionosphere waveguide
… the change in ionosphere height through the day-night boundary. The observed ionospheric heights are found to be dependent on the three kinds of source-receiver paths: daytime, nighttime and mixed. Accurate locations for individual events are obtained from the National Lightning Detection …
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Language as a Mediator between Home Environment and Prefrontal Functioning in Early Childhood
… through performing two verbal tasks, namely the Day/Night task and the Yes/No task and a non-verbal task, the Tapping task. Language, in turn, was assessed through the Peabody Picture Vocabulary Test (PPVT-III). The criteria proposed by Baron and Kenny (1986) were followed to test for the …
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Development of a Fast Method to Analyze Patterns in Airport Noise
… modeling flights from a single “representative day,” which lacks detail arising from the natural dispersion of flight tracks and variety in airport operations occurring throughout an entire year of operations. A framework for processing actual flight data and applying an existing, fast noise …
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Characterization and source apportionment of ambient PM2.5 in Atlanta, Georgia: on-road emission, biomass burning and SOA impact
… (EC), ionic species, and tens of trace metals. Day-night, seasonal and spatial variations of PM2.5 characterization were also studied. Contributions of PM2.5 major sources were identified quantitatively through the receptor source apportionment models. These modeling results, especially on-road …
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Circadian rhythms of redox state and regulation of neuronal excitability in suprachiasmatic nucleus of rodents
… metabolism, and behavior parallel the day-night cycle. They are driven by the central circadian clock in the brain, the suprachiasmatic nucleus (SCN), where a genetic oscillator plays an essential role. Clock-gene transcription/translation is sensitive to metabolic (redox) change; …
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Millikelvin temperature control system for the ExoplanetSat Imager
… from low Earth orbit, going through an orbit day-night cycle. In order to limit the noise induced by variable temperature, the temperature of the imaging device needs to be controlled within a steady level over the approximately 30 minutes of orbit night when the telescope is actively …
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Temperature and photoperiod effects on growth and development of day-neutral, junebearing and everbearing strawberries
Responses of day-neutral (DN) strawberries (Fragaria X ananassa Duch.) to photoperiod and temperature under controlled environment conditions were studied and compared to those of Junebearers (JB) and everbearers (EB). At a constant 21°C, DN cultivars flowered under 9 hour days (SD), night …
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