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 189 for “"Clocks"”.
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Odds and Clocks
Odds and Clocks explores different versions of reality as they emerge through Annabel, Beatrice and Charlie’s attempts to construct meaning and make sense of the world. As soon as the characters of the play find themselves trapped in a dark, empty space, they realize that they cannot explain their …
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Towards Water-Soluble Peroxyl Radial Clocks
… acyl xanthates as precursors to peroxyl radical clocks. These radical precursors offer the advantage that they have a pronounced ultraviolet absorption that tails into the visible, permitting efficient photochemical generation of the same alkyl radicals, but at longer wavelengths than that which …
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Biological Clocks, Inflammation, and Multiorgan Damage In Sickle Cell Disease
<p>Sickle cell disease (SCD) is a dangerous condition caused by a genetic mutation on the human beta-globin gene that contributes to erythrocyte sickling, the hallmark of the disease. Previous metabolomics studies have confirmed that elevated sphingosine kinase 1 (SphK1) mediates …
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Micro-fabricated diffractive optics for quantum sensors and atomic clocks
This thesis describes the design, construction and experimental realisationof a cold-atom, atomic clock. Diffractive optics are used to address the size constraints of the typical laser cooling apparatus to facilitate a portable device. The design and measurement of a wide range of grating …
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REGULATION OF CIRCADIAN CLOCKS AND METABOLISM BY ARYL HYDROCARBON RECEPTOR
… which AhR contributes to regulation of circadian clocks, fat metabolism and glucose homeostasis. In the first aim, I have tested whether AhR interacts with the core clock gene, brain and muscle AhR nuclear translocator like-1(BMAL1), disrupting circadian locomotor output cycle kaput (CLOCK)/BMAL1 …
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Investigating Transcription Factor Networks That Drive Biological Clocks and Oscillators
<p>Biological systems are highly dynamic, yet our temporal resolution of such</p><p>dynamical processes is often limited or difficult to test in the laboratory. The 24-hour</p><p>circadian rhythm and the approximately 75-minute cell cycle of a budding yeast cell are</p><p>both examples of dynamical …
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FROM CLOCKS TO EXERCISE, FROM METABOLISM TO PERFORMANCE: A CHRONOPHYSIOLOGICAL APPROACH
… the central biological clock and peripheral clocks is described, with a focus on clock genes such as Cry1 and Cry2, which are crucial in regulating metabolic processes and circadian rhythms. Then, experimental studies are presented, which demonstrate the effects of sleep impairments, …
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Cellular clocks on steroids: the mechanism of circadian entrainment by glucocorticoids
… GCs synchronize and reset the phase of cellular clocks is not completely understood. A plausible model has been proposed, following the classical genomic signalling pathway of its cognate nuclear hormone receptor, the glucocorticoid receptor (GR). The GR activates the transcription of the Period …
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Predicting the future of atomic clocks using the Theory of Evolution
… is very mature and the demand for this type of clocks expected to be flat. A size reduction is possible due to new physics improvement by using optical pumping technique, but no major changes in performance and prices are expected. The masers outperform the high performance cesium clocks for a …
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REGULATION OF CIRCADIAN CLOCKS AND METABOLISM BY SYNTHETIC AHR AGONIST BETA-NAPHTHOFLAVONE IN MICE
… the pace-maker and maintaining synchrony among clocks found in every organ system throughout the body. The core molecular clock consists of two interconnected transcriptional-translational feedback loops comprising core clock components: Brain and Muscle Arnt-Like protein1 (BMAL1), Circadian …
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Advancing Optical Lattice Clocks: Accurate Measurements on a Bosonic System and Development of a Hybrid Cavity-Lattice Clock
L'abstract è presente nell'allegato / the abstract is in the attachment
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Radical rearrangement in the spiro(cyclopropane-1,1'-indan) and 3',4'-dihydrospiro(cyclopropane-1,1'(2H)-naphthalene) systems. An investigation of fast radical clocks
The ring opening rearrangements of cyclopropylcarbinyl radicals incorporated in rigid indanyl and tetrahydronaphthyl frameworks were investigated by the competitive tin hydride method. At 75$\sp\circ$C, the spiro (cyclopropane-1,1$\sp\prime$-indan) -2$\sp\prime$-yl and …
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Chronobiological plasticity in Honeybee and its association with differences in the organization of the molecular pathway between central and peripheral clocks: the brain and flight muscle tissues.
… to the kind of relationships between different clocks, involving eventually total and partial autonomy, especially in such an excellent model in chronobiology: the Honeybee.
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Stability enhancement of atomic timekeeping using Raman adiabatic rapid passage
Current state-of-the-art atomic clocks span the range from large accurate fountain clocks such as the NIST-F2 to relatively small inaccurate chip scale clocks. Small clocks with higher accuracy could greatly expand the range of applications for precision timekeeping, and enable cheaper …
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From Scenarios to Optimally Allocated Timed Automata
… we consider the problem of optimally allocating clocks in timed automata. Reducing the number of clocks in a timed automaton is important, as it directly affects the complexity of the verification problem. Given a timed automaton, it is undecidable, in general, to check whether there exists …
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The role of a circalunar clock in speciation
… reproductive timing is controlled by biological clocks; endogenous molecular mechanisms that track environmental cycles. Given their prevalence, ecological relevance, and potential to isolate reproduction, biological clocks may play an important role in sympatric speciation. In my thesis, I …
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Quantitative characterisation of single-cell circadian rhythms in cyanobacteria Synechococcus elongatus
… surroundings. To perform their functions, the clocks must be sensitive to the entraining cues and simultaneously resilient to perturbations in their environments. It is unclear how clocks have evolved to find this balance in any species. Here, we used the cyanobacterium *Synechococcus …
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A spread-spectrum clock generator using phase interpolation for EMI reduction
… process. It takes in quadrature, differential clocks at either 2.5GHz or 5GHz, and provides quadrature output clocks at 625MHz or 1.25GHz. The output spectrum of the clock can be attenuated up to 19.6dB relative to the spectrum of an unspread clock. The core of the SSCG is a phase interpolator, …
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High-performance reference frequency generation techniques
… synthesizers that generate high-frequency clocks in modern wireline/wireless transceivers require high-frequency reference clocks to achieve excellent noise performance. In the first part of this work, we present ways to generate such reference clocks at 4 times the frequency of a standard …
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Opportunistic clock synchronization for ad hoc networks
… the participating computing nodes with logical clocks whose di erences can be bounded. Several traditional distributed clock synchronization algorithms use strict communication structures such as spanning trees. In such protocols, a node corrects its logical clock when it receives a new …
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