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 446 for “"primordial"”.
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Dynamics of primordial phase transitions, primordial magnetic fields, and Big Bang nucleosynthesis
… Specially, I have studied the dynamics of primordial phase transitions, primordial magnetic fields, and Big Bang Nucleosynthesis. In particular, (1) I have derived the effects of magnetic fields on nucleon and particle reaction rates of astrophysical significance. The sensitivity to the …
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Idenficiation of the zebrafish primordial germ cells
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Biology, 1997.
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Primordial evolution of cosmological perturbations: Theory and computation
… results in theoretical cosmology related to the primordial evolution of cosmological perturbations with the help of numerical analysis. Primordial fluctuations are thought to be the seeds of large-scale structure, therefore modelling their initial conditions and evolution is key to understanding …
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Probing primordial non-Gaussianity using large scale structure
… limit, which is consistent with vanishing primordial non-Gaussianity, although some triangular configurations on their own suggest a non-zero bispectrum which, if confirmed, would have a profound effect on modern cosmology.
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Molecular Mechanisms in Primordial Germ Cell Development in Zebrafish
In vielen Organismen, Primordiale Keimzellen, werden in frühen Entwicklungsstadien, entfernt von der Region wo sich die Gonaden entwickeln werden, spezifiziert. Daher müssen die Zellen zu dieser Region migrieren, wo sie sich dann in Spermien bzw. Oozyten differenzieren. Eine allgemeine Eigenschaft …
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Formalism for the rapid evolution of primordial black holes
This thesis presents two different formalisms which can be used together to evolve a density perturbation produced during inflation forwards in time in the radiation-dominated era of the early universe. The first formalism, based on early work by Misner and Sharp, is for the evolution of a perfect …
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Constraining the kinetically dominated Universe: Bayesian methods and primordial cosmology
… is taken to the study of the generation of primordial perturbations from a nite amount of cosmic in ation. It is demonstrated how a pre-in ationary stage that is kinetically dominated causes features in the primordial power spectrum. These features can be associated with cosmological …
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Primordial imperatives and the evolution of control of endolysosomal trafficking
… of the second law of thermodynamics. The primordial imperatives of the first and second law of thermodynamics underlie the evolution of the processes regulating membrane traffic. In order to meet the needs of maintenance of membrane integrity and osmotic stress with energy production, the …
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Signalling and transcriptional regulation of human primordial germ cell specification
Primordial germ cells (PGCs), the precursors of gametes, are specified in early post-implantation human embryos, which are inaccessible for direct investigation. This process can however be modelled using human embryonic stem cells (hESCs) for in vitro derivation of human PGC-like cells (hPGCLCs). …
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Illuminating the Cosmos: dark matter, primordial black holes, and cosmic dawn
… Second, I have investigated the formation of primordial black hole dark matter in a general model for inflation with multiple scalar fields. I have identified the space of models that can generate primordial black holes while remaining in compliance with observational constraints using a …
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Primordial black hole seeding from hybrid inflation : the direct integration approach
We examine the notion that supermassive black holes at the centre of galaxies, such as the Milky Way, could have been seeded in the early universe by the mechanisms of hybrid inflation. Using luminosity data, we estimate the current density of supermassive black hole. We develop the formalism of …
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Toward a Criticism of Theological Reason : Time and Timelessness as Primordial Presuppositions
<p>This investigation studies the possibility of developing a theological criticism of Christian theological reason. The investigation proceeds by developing a phenomenological analysis of three major contexts within which reason has been interpreted and utilized by Christian theology for the …
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The identification of novel factors required for the development of primordial germ cells
… fitness of the offspring. It has been shown that primordial germ cells (PGCs), the germ cells specified during embryonic development, have the highest mutation frequency compared to germ cells belonging to other stages of gametogenesis. Furthermore, mutations in PGCs are particularly important …
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Cosmic Echoes of the Early Universe: From Primordial Black Holes to Gravitational Waves
Our framework for describing physics on quantum scales, the Standard Model of particle physics, is both gloriously successful and self-evidently incomplete. Generations of particle physicists have hoped to fill the gaps in our framework by looking for new physics in a few specific ways. For …
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Molecular Mechanisms Regulating Neonatal Oocyte Survival and Primordial Follicle Formation in the Mouse Ovary
<p>In mammals, formation of the primordial follicle is a complex process involving the breakdown of germ cell cysts, where oocytes must separate from each other and subsequently become surrounded by somatic cells. As cysts separate, a large number of germ cells are lost by apoptosis, however the …
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Claiming Primordial Landscapes: Science and Imperialism in Turn-of-the-Century Science Fiction Novels
<p>This thesis argues that the relationship between nineteenth-century geology and paleontology play a role in imperial ambitions of countries and characters in science fiction novels. Two novels are analyzed—<em> Journey to the Centre of the Earth </em>by Jules Verne and <em>The Lost World </em>by …
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THE USE OF REPLICATION-DEFECTIVE ADENOVIRAL VECTORS FOR EXPRESSION OF PRIMORDIAL ATHEROGENIC LIPOPROTEINS IN MICE
… controversy exists as to the nature of the primordial lipoprotein and the requirement for MTP.
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Vascular Disease Pathogenesis In Smooth Muscle Dysfunction Syndrome and Majewski Osteodysplastic Primordial Dwarfism Type Ii
… Syndrome (SMDS) and Majewski Osteodysplastic Primordial Dwarfism Type II (MOPDII). SMDS is a rare condition due to pathogenic variants in <em>ACTA2 </em>p.Arg179, which lead to dysfunction of smooth muscle cells (SMCs) throughout the body. Complications of SMDS include early-onset thoracic …
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