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.
Results
Showing 1 to 20 of 239 for “"Ontogeny"”.
-
On Thymic Regulatory T-Cell Ontogeny
… provide a detailed picture of thymic Treg-cell ontogeny in native conditions. Finally, we applied our timestamping strategy to compare the function difference of T cells derived at neonatal and adult stages and demonstrated that neonatal-derived cells are more active. Thus, the developmental …
-
The Ontogeny of Antigen-Binding Cells
… selection is not likely to operate during ontogeny. This has several implications for theories on the origin of antibody diversity, and in particular suggests that positive selection may not be required for somatic diversification to occur. These results also suggest that the sharply …
-
Ontogeny within a convergent evolutionary context
… qualitative and quantitative study of phytosaur ontogeny and addresses the following research questions: (1) How do the crania and postcrania change through ontogeny in a single phytosaur genus, 'Redondasaurus'? (2) How do traits related to rostral morphologies (i.e., dental alveolus dimensions) …
-
Ontogeny of Prepulse Inhibition Across Sensory Systems
<p>Prepulse inhibition (PPI), employed as a measure of sensorimotor gating, is operationally defined by the presentation of a weak (prepulse) stimulus immediately prior to a startling stimulus, causing a reduction in the magnitude of the startle response. Alterations in gating are observed in …
-
Anti-Predator Responses of Squid Throughout Ontogeny
… ecological, and behavioral changes throughout ontogeny, the goals above were all investigated across different life history stages. To test the respective roles of vision and the lateral line analogue, squid of different life stages were recorded in the presence of natural predators under light …
-
Giraffa camelopardalis: limb bone histology through ontogeny
… specifically on osteohistological changes during ontogeny. The current study investigates the microanatomy and histology of giraffe limb bones through ontogeny. Mid-diaphyseal sections of humeri, radii, metacarpals, femora, and tibiae of 14 individuals representing individuals of known sex, as …
-
Inference of ecology from the ontogeny of microfossils
This work comprises three detailed studies of ontogeny and ecology. In the first chapter, four living species of the ostracode genus Cyprideis were studied both morphologically and ecologically to determine whether differences in age at maturity are correlated with heterochrony as expected; …
-
Locomotor Ontogeny and the Evolution of Avian Flight
… interact and potentially tradeoff during ontogeny and evolution. Using birds as a focal group, I have thus pursued two questions: (1) How does cooperative use of wings and legs help to bridge the developmental transition from an obligately-bipedal juvenile to a flight-capable adult? (2) Do …
-
Locomotor Ontogeny and the Evolution of Avian Flight
… interact and potentially tradeoff during ontogeny and evolution. Using birds as a focal group, I have thus pursued two questions: (1) How does cooperative use of wings and legs help to bridge the developmental transition from an obligately-bipedal juvenile to a flight-capable adult? (2) Do …
-
The ontogeny and function of intestinal dendritic cells
… expression of CD11b. In paper II, we assess the ontogeny and in vivo functions of intestinal CD103+CD11b- and CD103+CD11b+ intestinal cDCs. cDC subset development depends on distinct transcription factors (TFs) and while the development of CD103+CD11b- cDC depends on the TFs Id2, IRF8 and BatF3, …
-
Inference of ecology from the ontogeny of microfossils
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1989.
-
Ontogeny and evolutionary morphology of the skeleton in frogs
… two projects illuminate the relationship between ontogeny and the evolution of skeletal morphology in frogs. In the first part of this dissertation, I examine the evolution of skull development in pipoid frogs, a group that is exceptional in both morphology and life history. Two methods are used. …
-
Urbanization's Effects on Avian Morphology, Hormones, and Behavior Across Ontogeny
As the human population continues to grow at an unprecedented rate, anthropogenic changes are rapidly altering the remaining natural areas of the world. Urban-related stressors, such as lower food availability, the urban heat island, artificial light at night, and other pollution directly impact …
-
Ontogeny of contextual fear conditioning: behavioral, neuropharmacological and molecular mechanisms
This dissertation characterizes learning-related molecular changes in developing rodents using a variant of contextual fear conditioning called the context preexposure facilitation effect (CPFE). The CPFE is a variant of contextual fear conditioning in which acquisition of the contextual …
Page 1 of 12