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 80 for “"rhythmicity"”.
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Reliability and circadian rhythmicity of blood lactate
… different sampling times. Eventhough circadian rhythmicity was not a confounding factor in blood lactate concentration during exercise, the low correlations and the large SEM across times suggest that sampling time should be standardized.
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Circadian rhythmicity of rat neuroendothelial cells at the blood-brain interface
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-02-04 without embargo terms
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Rates and dates: Evaluating rhythmicity and cyclicity in sedimentary and biomineral records
It is important to evaluate periodic fluctuations in environment or climate recorded through time to better understand the nature of Earth's history as well as to develop ideas about what the future may hold. There exist numerous proxies by which these environmental patterns can be demonstrated and …
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Temporal organization of cry sounds: a comparison of cry rhythmicity in infants with and without colic
The temporal organization underlying durational components of naturally occurring infant cries was examined in 46 1-month-old infants, half of whom had been diagnosed as having colic. In a standard 90-sec crying bout for each infant, the presence or absence of expired cry sound was determined at …
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Lack of Rhythmicity in the Honey Bee Queen: An Investigation of Temporal Behavioral Patterns in <em>Apis mellifera ligustica</em>.
… determine if mated honey bee queens possess diel rhythmicity in behavior, we observed them in glass-sided observation hives using three types of observation regimes: focal studies consisting of 2-hour and 24-hour continuous observations as well as scan-sampling of multiple queens. All behaviors …
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Conditional Loss of Engrailed 1/2 in Rhombic Lip-Derived Neurons Increases Intrinsic Rhythmicity and Decreases Overall Variability of Eupneic Respiration
… (CV), and a unique measure of intrinsic rhythmicity called CV2. Linear regression analyses revealed that mutant animals had decreased overall variability and increased intrinsic rhythmicity (as measured by CV and CV2, respectively) compared to their control littermates, but we found no …
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The Pacemaker Function of the Small Intestine
… some extent the significance of the gradient of rhythmicity in the small intestine of the unanesthetized dog. The gradient of rhythmicity was studied on five dogs prepared with duodenal fistulas. Rhythmic contractions were recorded from the small intestine by a small rubber balloon. The gradient …
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Drumming Trees and Stone Percussion: An Evolution of Rhythm
… novel methodologies to visualise and evaluate rhythmicity. The first half of the thesis focuses on buttress drumming in wild chimpanzees as a cultural communication system. The second half of the thesis examines rhythmicity in tool use and manufacture, culminating in an experimental archaeology …
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Circadian rhythm, activity level, training habits and sports performance : the molecular and subjective components
Circadian rhythmicity, which is driven by a circadian clock, is a property of a biological process that displays an oscillation of approximately 24-hours even in the absence of external time cues. Individual differences in the preferred times of waking, activity and rest (sleep) are known as …
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Functional investigation of PERIOD in the mammalian circadian clock
… Per clock genes are essential for circadian rhythmicity, little is known about the cell-autonomous mechanisms that confer 24h organisation to the activity and subcellular localisation of PER-containing complexes. In this study, I aimed to provide a molecular understanding for the rhythmic …
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Molecular and Genetic Analysis of Neuropeptide Signalling in Mammalian Circadian Timekeeping
… the VIP and VPAC2 cells in controlling circadian rhythmicity, and to elucidate the mechanisms of VIP signalling that underpin these roles. The first two experimental chapters utilise intersectional genetics and viral transduction to address separable roles for the VIP and VPAC2 cell populations. …
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Conservation of Timeless in the Mammalian Circadian Clock
These data indicate that mTim is required for rhythmicity and is a functional homolog of dTim on the negative feedback arm of the mammalian molecular clockwork. This models supports conservation of transcriptional elements that are the basis for the molecular generation of circadian rhythms.
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Role of UV90 Gene in the FRQ-Less Oscillator of the Neurospora Crassa Circadian System
… compromises FRQ-less rhythms and also affects rhythmicity when FRQ is functional, demonstrating the close integration between the TTFL and FLO(s). My PhD dissertation research is focused on the uv90 mutation. The gene it affects has now been identified as gene number NCU05950. The uv90 mutation …
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Chronobiology and psychiatry : development of a conceptual model and integrative approach for South African psychiatrists
… developed slowly after it was recognised that rhythmicity was a fundamental property of life. However, the principles of chronobiology are not well integrated in clinical practice. Therefore, this dissertation aims to integrate neuroscientific knowledge in a curriculum for chronobiology to be …
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Identification of Gene Expression Changes in Sleep Mutants Associated With Reduced Longevity in Drosophila
… wild type group, I discovered large scale rhythmicity changes in the experimental groups. Aged wild type flies predominantly showed a gain of rhythmicity, while loss of rhythmicity was more evident in sleep mutants. Furthermore, with the transcriptome data as input, I developed a …
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Early Life Circadian Rhythm Disruptions Alters Brain and Behavior in Adulthood
… on executive functioning and circadian rhythmicity in adulthood. In the first phase of the study, sleep/wake rhythms were impaired with disrupting light-dark cycle imposed the day of birth until weaning. At around 3 months of age, animals were evaluated on executive functioning (i.e., …
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Modulation of Nocturnin Phosphatase Activity through the Disordered Amino Terminus
The endogenous circadian clock controls the rhythmicity of behavioral and physiological processes and this is entrained by the daily fluctuations in light and dark. Nocturnin (Noct) is a rhythmically expressed gene regulated by the circadian clock that belongs to the CCR4 family of …
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Comparisons of harmony and rhythm of Japanese and English through signal processing
… The rhythm of the language is measured by "rhythmicity", which relates to the periodic structure of speech in time and identifies the overall periodicity in continuous speech. Lower rhythmicity values indicate that the speech for one language is more rhythmic than another. The rhythmicities …
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Metabolic Regulation of Circadian Timekeeping
… might be essential for maintenance of circadian rhythmicity within cells, even in the absence of nascent transcription. The first portion of this thesis investigates the contribution of primary carbohydrate metabolism to cellular timekeeping, with particular emphasis on the pentose phosphate …
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