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 396 for “"Niches"”.
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Cultic Niches in the Nabataean Landscape: A Study in the Orientation, Facade Ornamentation, Sanctuary Organization, and Function of Nabataean Cultic Niches
<p>Niches are common features in the Nabataean landscape (Healey 2001; Starcky 1966: cols. 1008-10; Patrich 1990:50-113). From their frequent appearance in the archeological record, it is evident that the Nabataeans placed great importance on these cultic features. However, very little is known …
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Identification and characterization of epithelial progenitor niches in skin
… was to identify additional epithelial progenitor niches in the skin and characterize them. I focused on identifying and investigating the role of epithelial progenitors residing in two discrete compartments, the upper isthmus (UI) of the hair follicle and the touch dome (TD) in the epidermis, …
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Determinants of the structural niches of columnar cacti in the Southwest
I evaluated whether morphological differences among populations of Carnegiea gigantea and Pachycereus pringlei actually represent evolutionary adaptation, different developmental responses to the environment, or simply differences in population age structure. Populations of Carnegiea running east …
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Neural and Physical Niches Orchestrate Skeletal Remodelling and Promote Cartilage Regeneration
The skeleton is densely innervated by sympathetic noradrenergic and cholinergic nerve fibres. While several studies suggest the bone-catabolic nature of noradrenergic innervation in decreasing osteoblast activity and promoting osteoclastogenesis, there is little known on the development and …
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Ecological Niches, Species Distributions, And Biogeographic Processes In Rodents On Neotropical Sky Islands
… can lead to exaggerated estimates of their niches and potential geographic distributions due to issues of variable choice and resolution. In the second chapter, I demonstrated how the approach developed in Chapter 1 improved the ability of ENMs to detect an obvious environmental barrier …
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Seed dormancy and germination niches of Mediterranean species along an altitudinal gradient in Sardinia
The most crucial environmental factor for the failure of seedling emergence / establishment is temperature stress; consequently, seed germination should be triggered by favourable temperature conditions for the further development of the seedling. Therefore, temperature is the primary environmental …
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The Gratification Niches of Internet Social Networking, E-mail, and Face-to-face Communication
… to hang out — combining its relatively broad niches in Gratifications Opportunities and Entertainment gratifications, but shows little support for a displacement effect caused by its adoption.</p>
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Making Stem Cell Niches: An Ethnography of Regenerative Medicine in Scotland and the United States
This thesis presents the findings from an ethnography of stem cell science based on fieldwork with researchers in two connected laboratories in Scotland and the United States. It explores stem cell scientists' complicated interactions with live stem cell cultures within national projects of …
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Characterization of Cu-rich aggregates in neurogenic niches of the rodent brain by X-ray fluorescence microscopy
<p>Copper is an essential element in the brain playing several critical roles ranging from neurotransmitter synthesis to ATP production. As Cu is typically present in micromolar concentrations and has a spatially capricious distribution in the brain, determining concentrations has historically been …
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Modelling spatio-temporal changes in the ecological niches of major domesticated crops in China: Application of Species Distribution Modelling
… of crops in the past related to their ecological niches. In particular, it presents the niche models for five historically significant crops in China: rice, millet, wheat, barley and buckwheat. These models are rooted in the Species Distribution Modelling (SDM) methodology and infer the potential …
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Maculinea arion as an indicator of rare niches in semi-natural acid grasslands in South West England and the role of Myrmica species of ant
… V. lactea replacing V. riviniana in the hottest niches. Boloria euphrosyne oviposition sites are also influenced by microclimate and coincide with the niche of M. sabuleti, straddling the warmest microclimates occupied by V. riviniana and the coolest ones occupied by V. lactea. B. selene inhabits …
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The Late Cenomanian Anoxic Event; implications for foraminiferal evolution
… levels permitting recolonization of the vacated niches. On the latter, the OAE caused extinctions but resulted in a low oxygen tolerant fauna which slowly evolved into the vacated niches on the post-OAE recovery of oxygen levels. The changes in the foraminiferal populations have been integrated …
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The Nature of Niching: Genetic Algorithms and the Evolution of Optimal, Cooperative Populations
… of the general case of multiple overlapping niches. We discover that calculating the equilibrium point for three or more niches under resource sharing can be computationally expensive, as evidenced by the difficulty that GA selection has in reaching it. We present some evidence that …
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Histone Demethylase LSD1 Restricts the Size of the Germline Stem Cell Niche in Drosophila Ovaries
Specialized microenvironments called niches keep stem cells in an undifferentiated and self-renewing state by producing a variety of factors. The size and signaling output of niches must be finely tuned to ensure proper tissue homeostasis. I use the Drosophila female germline as an excellent model …
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The effects of local-scale resource heterogeneity on tropical tree communities
… examines the soil resource and topographic niches of tropical forest tree species and how they affect local (< 1 km) tree community structure. This research draws upon data from eight large (24-50 ha) tropical forest plots located around the globe, for which all trees > 1 cm in diameter have …
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Evolution of the diets of Australian Possums (Marsupialia: Phalangeriformes) from the Etadunna Formation in the Lake Eyre Basin, South Australia
… can help further narrow down possible dietary niches. Microwear refers to the microscopic pits and grooves in teeth created by food substrate grinding against the teeth during chewing. The ratio of scratches to pits is determined by the physical qualities of the food, including its hardness, …
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Stability and Dynamics of Resource Consumer Ecosystems
… resources that promote growth (defined as niches) and those predominantly consumed. This instability emerges when the discrepancy between consumption and growth exceeds the differences among nearest niches, indicating that species are more likely to encroach upon the niches of others rather …
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Empirical Evidence of Changes in the Coffee Market After Liberalization: A Case of Northern Tanzania
… research in input marketing and output market niches for Tanzanian coffee farmers. It recommends interventions to reduce credit problems, and to encourage market coordination.
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