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 37 for “"Population Variation"”.
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Relationships Between Population Variation and Ecological Variability
The recognition that populations generally harbor large quantities of variation has resulted in a wide ranging effort to relate this variation to that of the environment. There have been primarily two approaches to the question. The population genetics approach is to examine the level of population …
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The Importance of Individual and Population Variation to Human Stature Estimation
… from a data set of an entirely different population. This research explores the necessity for the unknown individual to be similar on a number of points to the known population that makes up the equation. Populations are highly variable, and one or two equations should not be applicable …
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The Importance of Individual and Population Variation to Human Stature Estimation
… from a data set of an entirely different population. This research explores the necessity for the unknown individual to be similar on a number of points to the known population that makes up the equation. Populations are highly variable, and one or two equations should not be applicable …
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Population variation in the life history traits and thermal responses of Atlantic cod, Gadus morhua L.
… interest to discover the extent to which such variation depends on genetic as opposed to environmental differences. A first step towards disentangling these effects is to use an empirical approach known as the common environment method in which wild-caught juveniles from different regions are …
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Leveraging cell micropatterning technology for rapid cell-based assessment of chemical toxicity and population variation in toxicity susceptibility
… assay's sensitivity and reproducibility, a small population of 56 healthy volunteers were recruited to give blood samples. Isolated lymphocytes from different individuals show significant differences in repair kinetics of oxidative damage and a sevenfold variation in repair rates. Taken together, …
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Population variation within the Iron Age of southern Africa: an assessment using dental anthropological and cranio-mandibular metric techniques
… Ceramic evidence connects these (cultural) populations to the second millennium Iron Age sites in eastern Botswana. This material culture differs from second millennium Late Iron Age (LIA) sites in South Africa which are attributed to migrations from east Africa and are connected, via the …
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Population Variation in the Mitochondrial-DNA of Two Marine Organisms: The Hard Shell Clam <i>Mercenaria spp.</i> and the Killifish, <i>Fundulus Heteroclitus</i>
… occurred at a frequencies of 0-89% in clam populations. Restriction site heteroplasmy occurred in 12% of the 317 individuals assayed. Results of the study indicated that although harbouring a wealth of genetic variation, clams from northern regions were similar and lacked evidence of …
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Combined Roles of Glandular-haired Alfalfa and Natural Enemies in Alfalfa Pest Managment in Virginia
… well, but this was not unexpected. The genetic variation of <i>B. anurus</i> was surveyed at both study sites using RAPD-PCR to establish or eliminate the possibility that differences in parasitization levels between the Piedmont and southwestern regions could be attributed to the presence of …
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Statistical analysis of short template switch mutations in human genomes
… scales in studies of genetic variation by using methods for structural variant calling. However, the genomic and evolutionary consequences of replication-based rearrangements remain poorly characterised at smaller scales, where they are usually interpreted as complex clusters …
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Establishing design vehicles for the hang-up problem
… choosing design vehicles for the vehicle population, variation in vehicle population, the ramifications of using a limited number of vehicles, and local conditions were considerations in selecting design vehicle types.;Wheelbase, front/rear overhang, and ground clearance, were collected …
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Patterns, maintenance and the evolution of behavioral variation and covariance: the presence of personalities in kangaroo rats
My dissertation examined patterns of variation and covariation among multiple behaviors in Merriam's kangaroo rats (Dipodomys merriami). I also examined the mechanisms that may be responsible for the maintenance of variation within and between natural populations of D. merriami and investigated the …
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Using Matched Craniometric and Genetic Data to Assess the Population Structure of Texas-Mexico Border Migrants
Human population structure studies suggest that craniometric and genetic data demonstrate similar genetic distances within and between populations. However, few studies use craniometric and genetic data from the same individuals to conduct comparative analyses. Therefore, it is necessary to assess …
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Modelling geometric uncertainties in prostate radiotherapy
… which differentiates betweengenuine measured variation and measurement uncertainty. A deformable model of theprostate is developed which encompasses population variation, interfractionalvariation and observer variability. Ultimately a simulation tool is produced to testdifferent schemes for …
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Human skeletal asymmetry. A study of directional and fluctuating asymmetry in assessing health, environmental conditions, and social status in English populations from the 7th to the 19th centuries.
… levels of asymmetry in English archaeological populations in order to distinguish between normal population variation and increased developmental instability or biomechanical stress. Directional and fluctuating asymmetry is assessed through a database of a comprehensive selection of …
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Inclusive and adaptive assessment of cardiorespiratory fitness for population health research
… fitness (i.e., fitness) in large population studies, overcoming logistical constraints and safety considerations associated with exercise testing that often lead to selection bias and distorted health associations. It presents the development, validation, and application of a …
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Nymphaea odorata (Water-lily, Nymphaeaceae): Analyses of molecular and morphological studies
… sequence repeat (ISSR) markers determined the variation present between and within two species of Nymphaea. The ITS region resulted in a phylogeny depicting strong separation between species (N. mexicana and N. odorata) and some separation between N. odorata's subspecies. The ITS region …
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From Ecological Epitome to Medical Model: An investigation into Applications for the use of Daphnia in Heart Science.
… are inappropriate in this context due to high population variance and sensitivity to small, subtle, environmental changes. A new aim was developed to determine whether beat-to-beat variation could be correlated with an individual’s response to toxic insult. Further, to develop more accurate and …
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Towards a sustainable production of Osmundea pinnatifida:: insight into the cultivation and biochemical composition of the species
… of O. pinnatifida. Phylogenetic analyses of populations along the West coast of Scotland were conducted, to identify the species prior cultivation experiments, but also to explore population variation within the frame of possible genetic pollution due to introduction of alien species for …
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Spatial structuring in trait variation in Polyommatus icarus in a functional context
… butterfly with marked within and between population variation in morphology, thermal biology, and voltinism. These traits together with allozymes and a neutral DNA marker (AFLP) variation are studied here to understand how geographic trait variation is related to environmental variation. …
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Habitat Mapping and Predator-Prey Dynamics in Ohio Resevoirs
… finding these drivers lies in helping to explain population variation. Saugeye Sander vitreum ¿ X S. canadense ¿ are stocked with varying success in Ohio reservoirs. As a step toward understanding what might be limiting saugeye in some reservoirs, we used spatially explicit information about …
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