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Evolution Of Vernalization And Photoperiod-Regulated Genetic Networks In The Grass Subfamily Pooideae, Meghan Mckeown
Evolution Of Vernalization And Photoperiod-Regulated Genetic Networks In The Grass Subfamily Pooideae, Meghan Mckeown
Graduate College Dissertations and Theses
Flowering time is a carefully regulated trait that integrates cues from temperature and photoperiod to coordinate flowering at favorable times of the year. This dissertation aims to understand the evolution of genetic architecture that facilitated the transition of Pooideae, a subfamily of grass, from the tropics to the temperate northern hemisphere approximately 50 million years ago. Two traits hypothesized to have facilitated this evolutionary shift are the use of long-term low-temperature (vernalization) to ready plants for flowering, and long-day photoperiods to induce flowering. In chapter one I review literature on the regulation of grass flowering by vernalization and photoperiod, and …
Exercise In Developing Rats Promotes Plasticity In The Prefrontal Cortex: Behavioral And Neurobiological Indications, Meghan Eddy
Exercise In Developing Rats Promotes Plasticity In The Prefrontal Cortex: Behavioral And Neurobiological Indications, Meghan Eddy
Graduate College Dissertations and Theses
Physical exercise has repeatedly been shown to trigger positive effects on brain function including improved learning, memory, and executive functions. In addition, corresponding physiological changes have been observed, such as increased neurotrophic factors, changes in neurotransmitter concentrations, and increased dendritic spines. However, these changes have not been well described outside of the hippocampus, including the medial prefrontal cortex (mPFC), and have not been directly compared at different points of development. Because the prefrontal cortex is one of the last brain areas to fully mature, considering the age at which intervention, such as exercise, takes place is particularly important. Additionally, in …
Parental Tobacco Use: Impact On Child Emotion Identification Ability, Allison R. Giroux
Parental Tobacco Use: Impact On Child Emotion Identification Ability, Allison R. Giroux
UVM Patrick Leahy Honors College Senior Theses
Although the physical effects of tobacco on an individual are well-known, the impacts that smoking has on social skills of family members are less understood. The ability for children to identify emotions is crucial for normal social functioning, and the impact of parental tobacco use during child development of this skill is not known. The proposed research compares parent-reported tobacco use to child emotion identification ability (EIA). Information regarding parental tobacco use history was gathered from a structured diagnostic interview of DSM-IV symptoms called the Composite International Diagnostic Interview. Child EIA was assessed using a paradigm called Emotional Faces, which …