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 58 for “"evolutionary change"”.
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Evolutionary change in the development of enabling technologies : a strategic perspective for advanced systems design
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1996.
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Organisational adaptation or environmental selection? An enhancement of the evolutionary change theory based on a study of the New Zealand electricity industry
… political conditions demand that organisations change to survive under new settings. Hence, the study of organisational change is an important topic within organisational studies as theorists continue to examine "how" and "why" organisations change. The Evolutionary Change Theory proposed by Van …
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Molecular Evolution of Anthocyanin Biosynthesis in Morning Glories
… of adaptation has become a central focus of evolutionary biology, and the incorporation of increasingly sophisticated analytical tools from molecular biology has made identifying causal genes a practical reality. The work presented herein addresses the effects of pleiotropic constraint on …
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Factors affecting the phenologies of life history traits in two summer annual plant species
… the potential for natural selection to effect evolutionary change in the phenologies of life history events. Three studies were undertaken to document the amount of phenotypic variation in the phenologies of life history traits, the degree to which selection is acting on these phenologies, and …
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The Dynamics of Animal Distribution: An Evolutionary/ecological Model (Zoogeography, Biogeography)
… Populations are thereby viewed as tending to change range in common directions, though at overall rates remaining peculiar to each. This interpretation is shown to lend itself to a synthesis of ecological and evolutionary approaches to distributional controls, and to suggest some novel …
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Metromorphosis : evolution on the urban island
… in the London tube system. Cities are hotbeds of evolutionary change, and regardless of whether or not new forms of life are destined to arise, they may help shed light on the origin of species.
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The street, the wall, and the corner
… rooms, neighborhoods. This room is in constant evolutionary change as it continues to define itself physically for its time and place in history. But the city is not just a physical thing, it is also a sense of place, of belonging to a moment in history, and to a distinct place in the world.
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A Study of Unionization in the Field of Nursing
Far reaching changes have occurred in the nursing area of health care during the past decades. Both nurses and nursing health care administrators need a perspective from which future attitudes and procedures can be charted. This overview of the evolution of nurse labor-management relationships …
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Events that shape genomes
… were used to identify and answer questions of evolutionary interest in four case studies. In doing so, a wide assortment of methodologies were used and developed, taking full advantage of the versatility that whole genome sequencing can provide. The genome of the Natal Long Fingered Bat, …
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Molecular Epigenetics in Evolution and Development
The dominantly held view in evolutionary theory focuses on gradual or punctuated change, primarily via natural selection, as the mechanism by which novel traits arise and evolution occurs. Noticeably absent from this portrayal of evolution is mention of the conservation of general characteristics, …
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Molecular evolution of the p53 network in reptiles
… we tested the related hypothesis that the evolutionary dynamics of, and mode of selection on, genes within the p53 network differs between reptiles and mammals, and that these differences may underlie the evolution of stress response diversity. We analyzed 32 genes of the p53 network in …
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Habit Preferences and Fidelity in the Cotesia Flavipes Complex (Hymenoptera: Braconidae): Current Preferences and the Potential for Change Through Learning and Selection
… at risk. I then examine two potential routes for change in the plant preferences of these parasitoids; learning and evolutionary change. I show that the hostplant of their larval host is unlikely to change the plant preferences of the adult wasp. Moreover, through an artificial selection regimen, …
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Carbon and sulfur isotopic constraints on Ediacaran biogeochemical processes, Huqf supergroups, Sultanate of Oman
The link between environmental and evolutionary change is investigated in the Ediacaran Period (- 635 - 541 million years ago (Ma), an interval where we see the emergence of macroscopic animals along with large perturbations to the carbon and sulfur cycles. Paleoenvironmental reconstruction used …
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The Evolution of Fitness After Prolonged Sperm Storage
… and while there was some evidence of evolved change, these results were not consistent. Although the data at hand do not substantiate a detailed characterization, both sexes in the experimental populations demonstrated increased fitness after extended mate-deprivation, thus evolutionary change …
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Sylvatic dengue: evolution, emergence, and impact on human health
… and evolutionarily distinct. The independent evolutionary events that resulted in the emergence of DENV were facilitated by the expansion of DENV progenitors’ host range in Asia to new vectors and hosts that occurred gradually over a period of several hundred years. Emerging viral pathogens …
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Interplay between competition and evolution in invaded and native plant communities
… and these processes can also produce rapid evolutionary change in plant communities. Although our understanding of ecological and evolutionary interactions is growing, so far little is known about how competition among plants interacts with evolution to shape communities. In my dissertation, …
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Interplay between competition and evolution in invaded and native plant communities
… and these processes can also produce rapid evolutionary change in plant communities. Although our understanding of ecological and evolutionary interactions is growing, so far little is known about how competition among plants interacts with evolution to shape communities. In my dissertation, …
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Hiding in plain sight: accounting for rate heterogeneity in trait evolution models
… is not independent of other phenotypes. Changes in a particular character may influence changes in another and modeling these characters in isolation can mislead our inferences. Second, evolutionary change is heterogeneous. Not all species are going to change in the same way at all times …
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Meramecian conodonts and biostratigraphy of the (upper Mississippian) Greenbrier Limestone (Hurricane Ridge and Greendale Synclines), southwestern Virginia and southern West Virginia
… elements of the K. levis-K. tenuis group. Evolutionary change from K. levis to K. tenuis is marked by slight Sa and Sb element changes, and the addition of an X element, DE Lambdagnathus fragilidens. Species of Kladognathus are promising Meramecian biostratigraphic markers. Also recognized …
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