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Biological Indicators Of Compost-Mediated Disease Suppression Against The Soilborne Plant Pathogen Rhizoctonia Solani, Lynn Fang

Graduate College Dissertations and Theses

Compost can suppress soilborne plant pathogens that cause significant damage on globally important food crops. However, reports of plant pathogen suppression are inconsistent likely because there are no established standards for feedstock material, application rate, and maturity age upon application. Excellent results can be achieved in greenhouse trials, but field applications are much less reliable. Disease suppression occurs through the activity of biocontrol organisms (direct antagonism), and general microbial competition. Biocontrol species are hypothesized to colonize the pile during the curing phase, but single species may not be as important as microbial consortia. Substrate composition during maturation may give rise …

The Interaction Mechanisms Of A Screw Dislocation With A Defective Coherent Twin Boundary In Copper, Qiongjiali Fang

Graduate College Dissertations and Theses

Σ3{111} coherent twin boundary (CTB) in face-centered-cubic (FCC) metals and alloys have been regarded as an efficient way to simultaneously increase strength and ductility at the nanoscale. Extensive study of dislocation-CTB interaction has been carried out by a combination of computer simulations, experiments and continuum theory. Most of them, however, are based on the perfect CTB assumption. A recent study [Wang YM, Sansoz F, LaGrange T, et al. Defective twin boundaries in nanotwinned metals. Nat Mater. 2013;12(8):697-702.] has revealed the existence of intrinsic kink-like defects in CTBs of nanotwinned copper through nanodiffraction mapping technique, and has confirmed the effect of …

Amygdala Pacap As A Mediator Of The Emotional Components Of Pain, Galen Missig

Graduate College Dissertations and Theses

Chronic pain alters sensory responses and carries a strong emotional component. Persistent pain can heighten pain experiences, resulting in hyperalgesia and allodynia. Further, patients suffering from chronic pain are more prone to experience a range of affective disorders including depression, sleep dysregulation, panic disorders, anxiety abnormalities and stress-related disorders including post-traumatic stress disorder (PTSD). Hence while pain serves a protective function to prevent additional physiological harm by driving behavioral and cognitive responses, chronic or persistent pain can lead to maladaptive nociceptive responses and exacerbate psychopathologies. Among brain regions, the amygdala is centrally situated to integrate the many descending and ascending …

Nicotinic Signaling: Alpha3 Beta4 Heteromers, Alpha5 Subunits, And The Prototoxin Lypd6b, Vanessa Ochoa

Graduate College Dissertations and Theses

Prototoxin proteins have been identified as members of the Ly6/uPAR super family whose three-finger motif resembles that of α-bungarotoxin. Though they are known to modify the function of nAChRs, their specificity is still unclear. Our lab identified three prototoxin proteins in the chicken ciliary ganglion: Ch3ly, Ch5ly, and Ch6ly. Ch6ly was later identified as prostate stem cell antigen (PSCA), and specifically decreased the amount of calcium influx through the homomeric α7 nAChR subtype. I then identifiedCh3ly and Ch5ly as LY6E and LYPD6B, respectively. I focused my attention onLYPD6B because of its expression in the brain. This dissertation tests whether LYPD6Bis …

Lake Trout Spawning Site Use In Lake Champlain & The Development Of The Binomial Rolling Residence Test, Victoria M. Pinheiro

Graduate College Dissertations and Theses

Lake trout populations were extirpated from the lower four Great Lakes by 1960 and from Lake Champlain by 1900. The decline of lake trout populations fueled a wave of restoration-based research that spanned the Great Lakes and filled in many of the gaps in our knowledge of lake trout behavior and ecology. However, remarkably little is known about lake trout spawning behavior, even less about sex-specific differences in spawning site use. Lake trout use specific spawning sites, and may return to the same site year after year. More males are caught on spawning sites than females and are present at …

Toward An Understanding Of The Breakdown Of Heat Transfer Modeling In Reciprocating Flows, Ian Pond

Graduate College Dissertations and Theses

Reynolds average Navier-Stokes (RANS) modeling has established itself as a critical design tool in many engineering applications, thanks to its superior computational efficiency. The drawbacks of RANS models are well known, but not necessarily well understood: poor prediction of transition, non-equilibrium flows, mixing and heat transfer, to name the ones relevant to our study. In the present study, we use a direct numerical simulation (DNS) of a reciprocating channel flow driven by an oscillating pressure gradient to test several low- and high-Reynolds' RANS models. Temperature is introduced as a passive scalar to study heat transfer modeling. Low-Reynolds' models manage to …

Teenagers' Mode Choice To And From School And Technology Use For Transportation: Analysis Of Students From Five High Schools In Vermont And California, Paola Rekalde Aizpuru

Graduate College Dissertations and Theses

The carhops and drive-ins of the 1950s are symbolic of the freedom that the automobile has granted Americans. What the general public has gained from the automobile, however, may come at the expense of independent mobility and choices for today's adolescents, particularly those not yet old enough to drive or those from lower income families. Sprawl land use development patterns and limited transportation choices in most American cities often hold teenagers and their chauffeuring parents captive to the automobile. At the same time, information and communication technology is fast evolving and changing the ways in which teenagers live, interact, and …

Becoming Transdisciplinary: Exploring Process In A Research Initiative On Climate Change, Emil Tsao

Graduate College Dissertations and Theses

The subject of this case study is the Vermont Agricultural Resilience in a Changing Climate initiative, a transdisciplinary research team at UVM that has maintained success in meeting research and outreach objectives despite collaborating in a way that does not follow any particular ideal-type transdisciplinary process. In following recent science and technology (STS) studies' accounts of cross-disciplinary collaboration, the hypothesis pursued is that the transdisciplinary study of messy or "wicked" problems like climate change brings forth an array of responses from researchers whose disciplinary backgrounds already position them to pursue their research differently, particularly when they involve outside stakeholders in …

Grass-Based Dairy In Vermont: Benefits, Barriers, And Effective Public Policies, Serge William Wiltshire

Graduate College Dissertations and Theses

A comprehensive literature review was undertaken in order to define and assess the sustainability and resiliency characteristics associated with grass-based and confinement dairy farming. Primarily as a result of reduced input costs, grass-based dairy farming often enhances profitability over confinement systems, especially on small farms. Further, conversion of tilled soil to permanent pasture has been shown to significantly reduce harmful sediment and nutrient transport into waterways. Perennial forage also acts as a carbon sink, curtailing or even negating a grass-based farm's carbon footprint. Finally, social benefits derived from enhanced nutrition and higher quality of life are also associated with grass-based …

Analysis Of Function Of The Son1-Interacting Protein, Lnk2 In Arabidopsis Thaliana, Prince Kudjoe Zogli

Graduate College Dissertations and Theses

The Arabidopsis SON1 F-box protein was implicated in regulating a pathogen defense pathway, but its exact function in wild-type plants is unknown. As an F-box protein it was predicted that SON1 would assembles into a SON1-SCF ubiquitin ligase complex that recruits specific plant defense-related proteins for proteolysis. The yeast 2-hybrid assay was used to screen for potential substrates for a putative SON1-SCF ligase, leading to the identification of Arabidopsis LNK2 as a SON1-binding factor.

Comprehensive protein-protein interaction analysis has shown that the binding of SON1 to LNK2 protein is specific, because closely related, full-length Arabidopsis F-box proteins do not interact …

A Science Instrument For The Digital Age: #Scistuchat Participants' Perceptions Of Twitter As A Tool For Learning And Communicating Science, Ryan Liss Becker

Graduate College Dissertations and Theses

The integration of digital technologies in K-12 education is ubiquitous. Web 2.0 technologies enable students who were once passive consumers to become active participants in, and even creators of, dynamic digital experiences. Social media, in particular, can connect disparate populations, minimizing traditional barriers such as time, space and geography. Similarly, science communication has also been influenced by an expanding array of media through which scientists can now connect directly with the public. #Scistuchat, the focus of this study, uses the social media platform Twitter to bring together scientists, secondary science students and teachers outside of school in monthly, science-focused Twitter …

Using The Community Readiness Model As A Framework To Understand A Community's Preparedness To Increase Food Access, Kristyn Dumont Achilich

Graduate College Dissertations and Theses

The work described herein is situated in a larger study investigating regional food systems as a method for improving food access for vulnerable communities. This research is part of the United States Department of Agriculture's Agriculture and Food Research Initiative project titled Enhancing Food Security in the Northeast for Underserved Populations (EFSNE). This work is ongoing and currently in year five of five. One of the primary objectives in year five is to facilitate the development of Learning Communities in each of the eight communities participating in the study. To do so, the research team planned to develop tools and …

An Evaluation Of Vermicompost As A Fast-Acting Nitrogen Amendment To Mitigate Nitrogen Deficiencies In Organic Vegetable Production, Peter Dalton Austin

Graduate College Dissertations and Theses

For sustained production, organic agriculture depends on plant needs being synchronized with the release of nutrients from organic amendments during decomposition within the soil. Because decomposition is strongly dependent on soil moisture and temperature, nutrient needs may not always be met as planned or synchronous with plant need. Unlike conventional agriculture, fast acting amendments are not readily available. Much of the evidence that vermicompost benefits crop production comes from studies on seed germination and production of starts in greenhouses. Yet, there is a dearth of information derived from field studies. Soil, soil and water nitrogen, plant development, and marketable yield …

Physical Activity In Nature And Children's Mental Health, Stephanie Marcia Bless

Graduate College Dissertations and Theses

The aim of this study was to determine if there is a relationship between children's physical activity and wellbeing, and if that relationship is enhanced by physical activity in nature. This study was a non-experimental retrospective multi-informant data review conducted at an outpatient pediatric psychiatric clinic in the Northeast. The theoretical framework used to guide this study was the Health Promotion Model, suggesting Advanced Practice Nursing investigate the relationship between health promoting behaviors and personal factors that support mental wellness in children and protect against mental illness. Data collected included age, sex, and exercise and wellbeing subsections of the Vermont …

Characterization Of Real-World Particle Number Emissions During Re-Ignition Events From A 2010 Light-Duty Hybrid-Electric Vehicle, Matthew Beach Conger

Graduate College Dissertations and Theses

Despite the increasing popularity of hybrid-electric vehicles (HEVs), few studies have quantified their real-world particle emissions from internal combustion engine (ICE) re-ignition events (RIEVs). RIEVs have been known to occur under unstable combustion conditions which frequently result in particle number emission rates (PNERs) that exceed stabilized engine operation. Tailpipe total PN (5 to 560 nm diameter) emission rates (#/s) from a conventional vehicle (CV) and hybrid electric vehicle (HEV) 2010 Toyota Camry were quantified on a 50 km (32 mi) route over a variety of roadways in Chittenden County, Vermont using the Total On-board Tailpipe Emissions Measurement System (TOTEMS). While …