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 54 for “"adaptive radiation"”.
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Adaptive Radiation Therapy Of Prostate Cancer
… actual dose delivered to the patient. Then the adaptive plans were compared to the original plan to evaluate tumor control and normal tissue complication using radiobiological model. Different PTV margins were also studied to access margin reduction techniques. If the actual dose delivered to …
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p53 in a Genetic Model: Illuminating Adaptive Radiation Responses
… the tumor suppressor protein p53 promotes adaptive responses, including cell cycle arrest, DNA repair, or apoptosis. How these distinct fates are specified through an action of a single protein is not known. To study its functions in vivo we produced a targeted mutation at the Drosophila …
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Genetic basis of adaptive radiation in East African cichlids
… African cichlids are a paramount example of adaptive morphological radiation. The most dramatic difference among species occurs in oral jaw design and correlates with ecological niche partitioning. Convergent evolution of trophic forms between lakes suggests a common mechanism. What …
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Adaptive radiation and speciation in African weakly-electric fish
… Mormyridae) have undergone an outstanding adaptive radiation, putatively owing to their ability to communicate through species-specific Electric Organ Discharges (EODs) produced by a novel, muscle-derived electric organ. Indeed, such EODs might have acted as effective pre-zygotic isolation …
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Macroevolution and phylogenomics in the adaptive radiation of Heliconiini butterflies
… and patterns across the rich diversity of the adaptive radiation. The relative importance across adaptive radiations of allopatry, changing ecological pressures, adaptive morphology and introgression promoted by natural and sexual selection remains unknown. I combine phylogenetics, genomics and …
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The generation and maintenance of diversity in a rapid adaptive radiation
… cichlid fishes are a pre-eminent example of adaptive evolutionary radiation. The diversity of species (nearly 1000 extant) is mirrored by an array of variation in dozens of phenotypes (e.g. trophic morphology, tooth shape, color patterns, behavior, development). The unique characteristics of …
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Improving Cone-Beam Computed Tomography Based Adaptive Radiation Therapy with Deep Learning
During radiation therapy, patient anatomical changes may compromise treatment quality if the treatment plan, prepared prior to therapy, remains unchanged throughout the course. Adaptive radiation therapy (ART) has been developed to address this issue by adapting the treatment plan based on …
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Adaptive radiation, speciation, and reproductive isolation in African weakly electric fish : (Genus Campylomormyrus, Mormyridae, Teleostei)
… the relevance of weak electricity in the adaptive radiation of the African mormyrid fish. The chosen model taxon, the genus Campylomormyrus, exhibits a wide diversity of electric organ discharge (EOD) waveform types. Their EOD is age, sex, and species specific and is an important character …
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Development of Advanced Mr-Guided Adaptive Radiation Therapy Methods For Head & Neck Cancers On The 1.5T Mr-Linac
… neck cancers (HNC). This device enables on-line adaptive radiation therapy (ART) based on anatomical changes throughout treatment and variations in patient position. This novel technology also has the potential for advanced ART strategies such as dose-optimized ART, in which the treatment plan is …
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Assessing the drivers of adaptive radiation in a complex of gall midges: A multitrophic perspective on ecological speciation
… physiological, and behavioral divergence in adaptive radiations have received very little attention. Until recently, the focus has been on primary resource competition as a major driver of trait divergence in adaptive radiations. Here I consider the role of natural enemies specifically in …
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Comparative Genomics Insights into Speciation and Evolution of Hawaiian Drosophila
… provides a natural arena for understanding adaptive radiation and speciation, and genomics and bioinformatics offer new approaches for studying these fundamental processes. The mode of speciation should have profound impacts on the genomic architecture and patterns of reproductive isolation …
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Pollination and the evolution of floral traits : selected studies in the Cape flora
… unrelated lineages (2) floral mimicry and (3) adaptive radiation within genera.
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Dispersal, gene flow, niche divergence and local adaptation in the hyper-diverse ruschioid Aizoaceae: testing alternative modes of speciation in the Knersvlakte quartz field flora of the Succulent Karoo, South Africa
… Karoo (SK), which has hosted the spectacular radiation of the ecologically dominant ruschioid Aizoaceae, a succulent group which exhibits extreme morphological diversity and convergence. This thesis focused on ruschioid Aizoaceae in the Knersvlakte, a small region of the SK which holds a …
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Evolution in biological radiations; insights from the Triassic archosaur radiation
Adaptive radiations, or evolutionary diversifications, are the evolutionary divergence of a single lineage into many different adaptive forms. They play a critical role in the history of life as groups of organisms speciate and fill new ecological roles over geologically rapid time intervals. There …
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Transcriptomic Insights into the Morphological Variation Present in Bromeliaceae
… including dry ones. Many attribute the large adaptive radiation of Bromeliaceae throughout the Neotropics to three main features: absorptive trichomes, tank reservoirs, and CAM photosynthesis. Based on leaf morphology and arrangement, root type, and nutrient acquisition, Pittendrigh (1948) …
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Radiation of the bark louse genus Kilauella across the Hawaiian Islands
… diversification within these islands. Studies of adaptive radiation on Hawaii could promote understanding of the evolutionary process underlying diversification patterns, but studies of Hawaiian taxa from a systematics standpoint are limited. The bark louse genus Kilauella (Psocoptera: …
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Adaptation and niche construction by Pseudomonas fluorescens SBW25
The mechanisms underlying adaptive radiation or evolution have been extensively investigated using experimental bacterial populations in liquid cultures, referred to as microcosms. Evolving populations of <i>Pseudomonas fluorescens</i> SBW25 in static microcosms reproducibly lead to the emergence …
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Using parasite communities to discriminate between sympatric morphs of threespine sticklebacks (Gasterosteus aculeatus) in lake Þingvallavatn, Iceland
Fish in lake systems can undergo adaptive radiation when different groups within a species occupy distinct parts of the lake, reducing competition between them and leading to resource-based polymorphism. This enables the morphs to specialize within their habitats, giving rise to rapid divergence, …
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Genetic structure and inversions in the Lake Malawi cichlid radiation
Adaptive radiations produce biodiversity at an accelerated rate. Traditionally, these ‘natural experiments’ have been central to studying the underlying evolutionary processes of adaptation and speciation. The modern synthesis unified evolutionary biology and genetics, fundamentally reorienting …
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Sexual Dimorphism and Trophic Trait Evolution in the Carolina Bay Fundulus Complex
… been considered in the studies of speciation and adaptive radiation. In the present study I investigated a to date little studied system, the Carolina Bay Fundulus species complex, in which patterns of convergence and divergence of body shape (and even speciation) have been suggested to be driven …
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