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 23 for “"Genetic exchange"”.
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Sociality in African mole-rats : exploring how rainfall affects dispersal and genetic exchange in the Natal mole-rat (Cryptomys hottentotus natalensis)
… on capture. Tissue samples were collected for genetic analysis and then they were implanted with a passive integrated transponder for identification at recapture. Groups were captured every six months over the course of 2 years. Both environmental factors and population demographics can have …
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Domestic greywater systems: a potential reservoir of antibiotic resistance genes transfer
… and biofilm samples, which suggests that genetic exchange occurs amongst bacteria in greywater and biofilm samples. Our findings support the hypothesis that greywater systems are colonised by resistant bacteria, which can form stable communities within the water environment which allows …
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From genomes to metagenomes: Big data analysis of microbes related to public health
… response during diarrhea episodes, and recent genetic exchange is spatial and functional biased, it can be rampant, and is largely driven by selection pressures (e.g., antibiotic treatment). Therefore, these findings advance our knowledge on the diversity and dynamics of microbial communities …
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Phylogenetic History, Morphological Parallelism, and Speciation in a Complex of Appalachian Salamanders (Genus: Desmognathus)
… correlation between morphological similarity and genetic exchange within and among nominal species due to a pattern of high discordance between the two. Phylogeographic hypotheses are tested for populations of the D. quadramaculatus species complex throughout southern Appalachia by combining …
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Lateral Transfer of DNA in Protocell-like Synthetic Cells
… could have promoted the horizontal movement of genetic material among protocells. Additionally, this work highlights key experimental challenges in modeling prebiotic genetic exchange, while also contributing to the development of synthetic biological systems that emulate early evolutionary …
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Factors influencing the spread and selection of drug resistance in Human African Trypanosomiasis
… using mini/microsatellite marker analysis. Genetic diversity was observed to be more intra than inter regional. Multilocus genotype data analysis revealed the Omugo, Arua, population was genetically distinct from the Moyo population (Nei’s genetic distance=0.176). The evidence indicated …
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A study of the ecology & diversity of bacteriophages
… shown that bacteriophages do undergo extensive genetic exchange with one another (Hendrix et al., PNAS, 96,2192-97), however, these have examined bacteriophages from varied locations. Unlike previous studies, this work examines the ecology of phages and their hosts in a single soil source. By …
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Population ecology of the dinoflagellate species Lingulodinium Polyedrum in southern California
… of the population dynamics and the intraspecific genetic diversity of this species in coastal waters of Southern California. The life cycle experiments showed that processes such as gametogenesis and ecdysis of L. polyedrum are influenced by photon flux density (PFD) and gave a first indication …
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The Consequences of Plant Anatomy on Viral Co-Infection
… to interact, so that it can be determined where genetic exchange events occur in the future. I investigated the viral population dynamics of tobacco etch virus (TEV, genus Potyvirus) within the plant host Nicotiana benthamiana using both whole plant and microscopic fluorescence imaging. To …
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Investigating the relationships between biotic and abiotic factors affecting migratory behavior in Westslope Cutthroat Trout within the Priest River System
… for various reasons, facilitating genetic exchange between populations and yielding larger-sized females with increased fecundity relative to residents. This study took place in northern Idaho, within the lower Priest River system, which is highly susceptible to degrading habitat. …
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A Molecular Anthropological Study of Altaian Histories Utilizing Population Genetics and Phylogeography
This dissertation explores the genetic histories of several populations living in the Altai Republic of Russia. It employs an approach combining methods from population genetics and phylogeography to characterize genetic diversity in these populations, and places the results in a molecular …
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Identifying natural modifiers of meiotic crossover frequency in Arabidopsis thaliana
… chromosomes pair and undergo reciprocal genetic exchange, producing crossovers. This generates genetic diversity and is required for balanced homolog segregation. Despite the critical functions of crossovers, their frequency and distribution varies extensively within and between species. …
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The study of ancient viral class II envelope fusion proteins within the viral retroelements of Nematoda and the nuclear plasmids of Dictyostelium
… of envs and the importance of selfish genetic elements (i.e. viruses, plasmids, and transposons) in host genomic evolution, horizontal gene transfer, and virus evolution. The work presented in this thesis highlights the role viral fusion proteins and their homologues in biological …
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Reproductive ecology of Vestimentifera (Polychaeta: Siboglinidae) from hydrothermal vents and cold seeps
… Their mechanisms of propagation, dispersal and genetic exchange have been widely discussed. Direct sperm transfer from males to females has been documented in two species, Ridgeia piscesae and Tevniajerichonana, but others were believed to spawn primary oocytes. Brooding of embryos have never …
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Effects of altered expression of the sumo conjugating enzyme, UBC9 on mitosis, meiosis and conjugation in Tetrahymena thermophila
… distinct nuclei in <em>T. thermophila</em> using genetic analysis combined with proteomics study. We found that complete deletion of the <em>UBC9</em> gene is lethal. Rescue of the lethal phenotype with a <em>GFP-UBC9</em> fusion gene driven by a metallothionein promoter generated a cell line with …
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The Bioarchaeology of An Sơn and Hòa Diêm: Biosocial Insights into Prehistoric Southern Vietnam
… both An Sơn and Hòa Diêm support the notion of genetic exchange between indigenous and migrating populations, albeit of different groups during different time periods. These observations play directly into what we know about connectivity and the complexity of regional mobility in the past. Large …
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The Bioarchaeology of An Sơn and Hòa Diêm: Biosocial Insights into Prehistoric Southern Vietnam
… both An Sơn and Hòa Diêm support the notion of genetic exchange between indigenous and migrating populations, albeit of different groups during different time periods. These observations play directly into what we know about connectivity and the complexity of regional mobility in the past. Large …
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Collective Evolution of Biological and Physical Systems
… of the universality and optimality of the genetic code, and the emergence of genome biases. I present a new phase-field model of solidification which allows efficient computations in the regime when interface kinetic effects dominate over capillary effects. The asymptotic analysis required …
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The genetic structure of New Zealand's coastal benthos: using the estuarine clam Austrovenus stutchburyi, to determine rates of gene flow and population connectivity
… disturbed or degraded habitats and achieve genetic exchange between geographically separated subpopulations. While it is widely accepted that the dispersal process is important in determining the dynamics of many marine communities, difficulties associated with the direct measurement of …
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Riverscape Community Genomics of Ozark Fishes: A Comparative Framework to Infer Ecological and Evolutionary Determinants of Genetic Diversity
<p>Genetic variation is a crucial component of biodiversity and represents the variability and spatial structure of alleles within and among organisms. Evolution modulates this variability over time through mutation, selection, gene flow, and genetic drift. However, our capacity to test …
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