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 1298 for “"niche"”.
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Phylogenetic Niche Modeling
Projecting environmental niche models through time is a common goal when studying species response to climatic change. Species distribution models (SDMs) are commonly used to estimate a species' niche from observed patterns of occurrence and environmental predictors. However, a species niche is …
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Niche-adaptive evolution in Campylobacter jejuni
… research predicted that due to sharing a host niche commonly associated with C. coli, the porcine ST403CC may show evidence of increased recombination with C. coli, however this was not observed. Six ST403CC isolates of porcine origin were subjected to phenotype testing and whole genome …
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The cultural niche of sublimated creativity
The dearth of empirical research on sublimation may be demonstrating the inherent difficulty scholars in the past have experienced in capturing the process of sublimation in the lab (Baumeister, Dale, & Sommer, 1998). Given the suspected difficulty of empirically capturing the process of …
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Niche strategies in the healthcare industry
This paper examines niche strategies in the healthcare industry. I begin by discussing productivity trends in large firms. In order to understand trend shifts in productivity from a focus on output to a focus on input, I examine the competitive strategy frameworks of Duncan Simester of MIT, and …
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Unearthing an educator's ecological niche: A heuristic inquiry
<p>The purpose of this study is to better understand how the natural environment influences who we have become as adults. Recognizing the importance of childhood experiences, with and within nature, the intent of this study is to interpret the essential meanings associated with these experiences …
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Empirical Evidence of Pricing Efficiency in Niche Markets
Unique and proprietary data of the illiquid, one-year non cancelable for three month Bermudan swaps (1Y NC 3M swaps) and one-year non callable for three months Bermudan CDs (1Y NC 3M CDs), provides evidence of market efficiency. The 1Y NC 3M swap and 1Y NC 3M CD markets efficiently reflected …
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Niche construction and plant-use in the Mesolithic
… Mesolithic people actively constructed their own niches through the use and possible management of wild plants, and by creating and maintaining woodland clearances to increase their control over animal and plant resources. Recently, it was suggested that Mesolithic people in Ireland may have …
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Adult Neural Stem Cells and Their Perivascular Niche
Stem cells reside in specialized niches that support their selfrenewal and differentiation. A balance between intrinsic and extrinsic signals mediates stem cell quiescence, activation and proliferation. In the mammalian subventricular zone (SVZ), the stem cells are a subset of GFAP+ astrocytes. A …
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Adaptation and niche construction by Pseudomonas fluorescens SBW25
… the original environment to establish two new niches corresponding to a high-O<sub>2</sub> region at the A-L interface and a low-O<sub>2</sub> region lower down the liquid column. Greater O<sub>2</sub> availability at the A-L interface was found to provide the selective pressure driving the …
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Life history implications of the mother's choice for a larval habitat. Niche choice and niche conformance in the fire salamander, Salamandra salamandra
… Amphibians might shift to different habitats or niches (niche choice), adjust their phenotype to match the given habitat (niche conformance) or change the environment to match their phenotype (niche construction). This research aims to investigate niche choice and niche conformance in the …
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Molecular insights into the niche of harmful brown tides
… insight into the fundamental and ecological niche space of this harmful algal species with respect to N and P and provide a platform for assaying nutrient controls on natural brown tide blooms.
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Refining Our Understanding of the Hematopoietic Stem Cell Niche
… maintenance. However, the identity of the HSC niche is still poorly understood. One new model of the HSC niche is that HSCs, periarteriolar stromal cells, and nerve fibers are closely associated in rare periateriolar niches. Using a novel marker to identify HSCs in three-dimensional confocal …
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A Phenomenological Study Into Niche Marketing In Higher Education
… themselves from competing institutions through niche marketing initiatives. This qualitative, phenomenological study developed existing research and addressed a gap in the literature as it relates to niche marketing in higher education. The research objective of this study was to illustrate the …
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Social niche construction: evolutionary explanations for cooperative group formation
… a positive feedback process that we call social niche construction.<br/><br/>We argue that this process is necessary in providing an adaptive explanation for some of the major transitions in evolution (such as from single- to multi- celled organisms, and from solitary insects to eusocial …
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Niche Differentiating Mechanisms in Two Sympatric Species of Swallows
The present study considers certain aspects of the ecologies of cliff swallows (Petrochelidon pyrrhonota) and bam swallows (Hirundo rustica) in an area of overlap, where both species are found nesting together and foraging over the same fields. Careful attention was given to foraging flight …
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Microscale Tissue Engineering and Contributors of the Cellular Niche
… cells is modulated by their microenvironment or ‘niche’. While cellular therapies offer promising curative solutions for many diseases, the efficacy of transplanted cells is often hampered by a suboptimal microenvironment. One strategy to overcome this limitation is to reconstruct the niche of the …
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Transitioning to sustainable urban development: a niche-based approach
… with alternatives incubated in socio-technical niches, or networks of actors that play by different ‘rules of the game.’ This dissertation looks specifically to the relationship between local urban development regimes and ecovillages—grassroots niche projects ideologically committed to …
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Lean product development for the automotive niche vehicle marketplace
The automotive low volume niche vehicle marketplace is growing, evidenced by increasing media coverage and fierce competition between original equipment manufacturers. Development of niche vehicles must be lean and therefore fast to beat competitors and keep customers interested. This thesis case …
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