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 “"morphological variations"”.
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Molecular, cytogenetic, anatomical, and morphological variations associated with polyploids of prairie cordgrass
… diversity, chromosome structural changes, and morphological variations within the species. Through chloroplast DNA (cpDNA) phylogenetic analyses, three distinct genetic haplotypes were identified, which are relatively associated with geographic distribution and ploidy level. Genetic diversity …
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Assessing the Impact of Femur Morphological Variations on Pediatric Hip Joint Biomechanics Using Statistical Shape Modeling
<p>This dissertation aimed to (1) quantify morphological variations in the pediatric hip joint and (2) evaluate the sensitivity of an infant musculoskeletal model (MSM) to these variations, considering hip joint center estimation errors. A shape statistical model (SSM) of decedent infant femurs …
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The interplay of structure and optical properties in individual semiconducting nanostructures
… improvement of optoelectronic devices. Nanoscale morphological variations can drastically affect overall nanostructure properties because the investigation of nanostructure assemblies convolves nanoscale fluctuations to produce an averaged result. The investigation of individual nanostructures is …
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Senescence of Native Perennial Warm Season Grasses Senescence Associated Switchgrass Transcriptome
… synthesis in late senescencing switchgrass. Morphological variations between the two germplasms prolong the growing season of late senescencing switchgrass, maximizing yield. Expression of mRNA as senescence progresses and between the two genotypes reveals potential targets and genes of …
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Exploring Eastern Musk Turtle (Sternotherus odoratus) Population Dynamics and Phenotypic Plasticity in Comal Springs, Texas
… toward these gastropods are associated with variations in head and body morphology. Seventy-one individuals were captured in June and July 2024. Morphometric data and fecal samples were collected to assess diet composition and morphological variations. Dietary analyses identified Tarebia …
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Using parasite communities to discriminate between sympatric morphs of threespine sticklebacks (Gasterosteus aculeatus) in lake Þingvallavatn, Iceland
… habitats, giving rise to rapid divergence, both morphological and genetical, sometimes eventually resulting in reproductive isolation and sympatric speciation. The threespine stickleback (Gasterosteus aculeatus) is a good example of this phenomenon, where different morphs exhibit morphological …
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Morfologia comparada do estômago e da junção gastroduodenal de morcegos da família Phyllostomidae (Mammalia, Chiroptera)
Comparative morphological study of the stomach and the gastroduodenal junction is undertaken in 12 genera of bats representing five sub-families of the family Phyllostomidae. We dissected and prepared histological sections of the stomach and gastroduodenal junction of 80 microchiropteran specimens. …
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Single nephron structure and function, and renal effects of catecholamines in the dogfish, Scyliorhinus canicula
… primary processes and interdigitating pedicels. Morphological variations were common, with areas of flattening and broadening of these structures. 3. The nephron was found to be composed of Bowman's capsule, neck segment, first, second and third proximal segments, and distal segment, identified …
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Biological Control of Marmara gulosa Guillén and Davis in the San Joaquin Valley
… parasite of <em>M. gulosa</em>. Newly discovered morphological variations within the species are reported, including the first description of the male. New biological information including preferred life stage of host for parasitism, clutch sizes, male to female ratios and meconial positioning are …
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Aspectos da variação morfométrica em Triacanthagyna septima (Selys, 1857) (Insecta, Odonata, Aeshnidae), com notas sobre a sua taxonomia
… to Southeastern Brazil. This species shows morphological variations of discrete nature in some structures of the wing venation. These variations were analyzed, using statistical methods, in 225 specimens from Southeastern Brazil. This analysis was carried out with the aim of describing the …
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In vivo knee biomechanics and implications for total knee arthroplasty implant design
… can be obtained by incorporating gender specific variations into TKA designs. With regards to the first objective, significant differences were noted between the trochlear groove geometry of standard TKA implant and the normal knee, which could lead to non-physiologic patellar tracking post-TKA. …
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Durability study of proton exchange membrane fuel cells via experimental investigations and mathematical modeling
… The behavior is explained on the basis of the morphological variations of hydrophilic channels, accompanied by the rotation, orientation and disentanglement of the copolymer chains in the hydrophobic domains, as illustrated with the help of our bundle-cluster model. Finally, the long-term aging …
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An ecological study of the cricket frog, Acris crepitans, in northeastern Kansas
… habitats separated by only a few miles. Morphological variations have been used as criteria for taxonomic studies for years, but ecological criteria have come into use only recently. However, little is known concerning ecological variation within a local area. Since Acris crepitans lives …
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A chemical and mechanical evaluation of interfacial fracture in dicyandiamide cured epoxy/steel adhesive systems
… addition of toughener drastically impacted the morphological, bulk mechanical, and adhesive properties in these latent cure systems. Modulus values decreased and bulk fracture toughness values increased with increasing toughener content. Static double cantilever beam (DCB), fatigue DCB, and …
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Variation drives response to urbanisation: Evolutionary ecology of two introduced birds within anthropogenic environments : A thesis submitted in partial fulfilment of the requirements for the Degree of Doctor of Philosophy at Lincoln University
… as well. Populations will show behavioural and morphological variation along an urban-rural gradient in response to accompanying environmental changes. Certain behaviours, risk-taking, aggression and exploratory behaviour, will increase opportunities for populations to establish and maintain …
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Stem cells and neoplasia a study of acquired melanocytic naevi
… analysis. Yet, these cells showed important morphological variations and were distinct from differentiated epidermal melanocytes. Furthermore, although studies have suggested regional variations in naevi and a possible Schwann cell lineage, there was no evidence in support of a Schwann cell …
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Machine Learning Approaches for Biosonar Systems: Investigating Dynamic Sensing in Complex Natural Environments
… This dissertation investigates how both static morphological variations and dynamic shape changes in biomimetic receiver structures can encode reliable information within these random echoes, progressing from linear acoustic effects to nonlinear Doppler-based signatures. The first component of …
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The eco-physiology of New Zealand forest lichens with special reference to carbon dioxide exchange
… increase was 7.0 mm yr⁻¹. (ii) The intraspecific morphological variations of Pseudocyphellaria dissimilis populations are assessed and are related to the nitrogenase activity and water relations of each population. The effect of thallus water content on CO₂ exchange in eight lichen and one …
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A Computational Study on the Structure, Dynamics and Mechanoelectric Transduction of Vestibular Hair cell
… enables us (1) to study how the hair cells' morphological variations are related to their function; (2) to investigate the hair cell mechanoelectric transduction at the single channel level, in silico, as opposed to the statistical approach; (3) to test the response of hair cells under in …
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