Digital Commons Network^™

Advancing Global Tobacco Control: Exploring Worldwide Youth Attitudes And Behaviors Toward Tobacco Use And Control, Sreenivas Phanikumar Veeranki

Electronic Theses and Dissertations

Tobacco use continues to be the leading cause of preventable death in the world. The disproportionate increase in tobacco use in low- and middle-income countries needs immediate attention. Many smokers begin smoking as adolescents and are most likely to become permanent smokers. Moreover, youth are highly targeted by tobacco industry strategies. However, a gap exists in literature to understand worldwide youth tobacco use and control. The purpose of this study is to 1) identify factors that influence never-smoking youths‟ smoking susceptibility, 2) explore characteristics that influence youth exposure to environmental tobacco smoke (ETS) and 3) to delineate key determinants of …

Impact Of Hybrid Rice On Food Security: A Spatial Equilibrium Analysis Of Global Adoption And Diffusion Of Hybrid Rice Varieties, Till Ludwig

Graduate Theses and Dissertations

Rice is the staple crop for most consumers in Asia. More than half of the global population depends on rice. However, scarce resources for agricultural production and unfavorable conditions will make it hard to meet future demand in rice and threaten future food security. Hybrid rice technology is a method to increase the productivity of resources needed for rice production. Current developments show not only yield improvements in comparison to existing conventional and hybrid varieties, but also fuel hopes for new abiotic and biotic stress tolerance. The objective of this study is to determine what impact hybrid rice varieties can …

Assessing Knowledge Acquisition Through Lecture And Cooperative Learning: Traditional And Non-Traditional Secondary Students In Agriculture, Beth Ann Jean Bills-Hunt

Graduate Theses and Dissertations

Currently, students entering secondary agricultural education programs have less knowledge and hands-on experience about agriculture than previous generations. Agricultural educators are challenged to vary teaching practices to meet student needs. The purpose of this study was to determine if there is a difference in knowledge acquisition between students enrolled in secondary agricultural education classes taught by cooperative learning and lecture instruction. Additionally, this study explored the knowledge acquisition of traditional and non-traditional secondary agricultural education students and perceptions of instructional methods presented. Eight schools participated in the study. No significant difference was seen in test scores between methods of instruction, …

Mass Latex Balloon Releases And The Potential Effects On Wildlife, Stephan Irwin

All Dissertations

The first component of the study examined the fate of balloons after release to determine aspects of where, in what state, and how long they persist in the environment to assess potential risk of exposure to wildlife. Tagged balloons from sporting events gave estimates of mean distances traveled from releases. Effects on the structural integrity of the latex balloon as it reaches the upper atmosphere were also tested to determine the physical state when fragments landed. Degradation studies were conducted to determine the length of time latex can persist in the environment after exposure to various environmental conditions (sun, shade, …

Toward A Theory Of Media Reconciliation: An Exploratory Study Of Closed Captioning, Nicole Snell

All Dissertations

This project is an interdisciplinary empirical study that explores the emotional experiences resulting from the use of the assistive technology closed captioning. More specifically, this study focuses on documenting the user experiences of both the D/deaf and Hearing multimedia user in an effort to better identify and understand those variables and processes that are involved with facilitating and supporting connotative and emotional meaning making. There is an ever present gap that defines closed captioning studies thus far, and this gap is defined by the emphasis on understanding and measuring denotative meaning making behavior while largely ignoring connotative meaning making behavior …

Lignin Modification In Arabidopsis And Populus For Studies Of Gene Function And Improving Lignin Degradation, Yi Xu

All Dissertations

Lignin is one of the most abundant biopolymers in plants and plays an important role in plant structure and stress defense. Lignin is also considered to be a hallmark of vascular plants because of its crucial role in plant terrestrialization. However, lignin is an undesired component in the pulp and paper industry, bioethanol production, and forage digestibility. Thus, understanding the functions and the evolution of lignin biosynthesis genes can not only advance our knowledge of the evolution of land-adaptation for vascular plants but also help guide the effort to exploit the potential for genetic manipulation of lignin for desirable traits …

Adolescent Perceptions Of Digital Play: A Study In Third-Person Effects, Wendy Blanchard

All Dissertations

ADOLESCENT PERCEPTIONS OF DIGITAL PLAY:
A STUDY IN THIRD-PERSON EFFECTS
ABSTRACT
With the third-person effect as a conceptual framework, this study examined perceived effects of digital media and electronic devices among charter high school students in the Southeastern United States. In studying third-person perceptions, the study built on research by Schmierbach, Boyle, Xu and McLeod (2011), who analyzed perceived effects of digital gaming among college students.
In addition to items addressing the positive and negative effects of digital media and electronic devices, participants in the current research responded to questions about time spent exercising and in the outdoors, time spent …

The Influence Of Flagship Species On In Situ And Ex Situ Wildlife Tourists' Connection To Wildlife And Pro-Conservation Behaviors, Jeffrey Skibins

All Dissertations

Annually, millions of tourists visit natural areas and zoos primarily to view flagship species such as lions and elephants. Venues rely on the inherent charisma of these species to increase visitation and anchor conservation efforts. Expected visitor outcomes from the use of flagships include raised levels of awareness and pro-conservation behaviors. However, the role of flagships in wildlife tourism has been criticized for not delivering conservation benefits for species of interest or biodiversity, and producing negative site impacts. Furthermore, little is known about how the connection to a species influences conservation behaviors. This dissertation addresses this gap in knowledge by …

Ecology And Phylogeny Of The Biting-Midge Genus Culicoides (Diptera: Ceratopogonidae), Dustin Swanson

All Dissertations

Flies of the genus Culicoides are small, biting midges in the family Ceratopogonidae. These flies are of medical, veterinary, and economic importance because their blood-feeding behavior can cause stress to hosts and transmit disease agents. Despite the importance of these flies, little is known about their biology, especially the ecology of the immature stages and the phylogenetic relationships among taxa. The objectives of my study were to address these two areas of Culicoides biology.
Larval Culicoides were collected from aquatic habitats in four ecoregions of South Carolina, USA. Eleven ecological variables were recorded for each sample. Larvae were identified by …

Avian Phenology, Climate, And Land-Use Conservation Assessed At Broad Spatial And Temporal Scales Using Interdisciplinary Approaches And Citizen Science, Jason Courter

All Dissertations

Current natural resource challenges include global alteration of land cover, loss of biodiversity, impacts from increasing demands for agricultural products, and climate change. Birds are often used to assess the effects of ecological stressors because they are sensitive to environmental changes, ubiquitous and charismatic, and long-term monitoring programs have been in place for more than a century. I demonstrate the effects of climate change on avian migration and nesting dates and the potential value of using interdisciplinary approaches and citizen science to address contemporary ecological challenges. I examine Ruby-throated Hummingbird (Archilochus colubris) migration in the eastern United States from 1880-2010 …

Purdue University's Foundations Of Excellence Final Report: A Roadmap For Excellent Beginnings, Office Of The Provost, Purdue University

Office of the Provost Publications and Reports

This report lays the groundwork for a new campus culture focused on excellent, intentional, and integrated curricular and co-curricular efforts for all students, according to their specific needs, so that they can achieve academic and personal success. In addition, it provides a blueprint for coordinating assessment and dissemination of findings to foster continuous improvement among the University’s overall student success efforts.

Relationship Of A Nutrition Intervention Class For Middle School Students On Nutrition Knowledge And Attitudes, Kathy Hood

Doctoral Dissertations and Projects

A pre-test post-test nonequivalent group design was utilized to investigate the role nutrition education has on a student's choice to eat healthy foods. The Nutrition Essentials: Teaching Tools for Healthy Choices nutrition module was used to teach clinically based nutrition. The research used rural Georgia seventh and eighth grade students' to evaluate the effects of nutrition education on the students' nutrition knowledge and attitudes using the SPAN student questionnaire. MANOVA was used to determine if changes occurred between the control and experimental groups. Results of the study showed that the short term study did not improve student nutrition knowledge or …

Pastoral Care: A New Model For Assessing The Spiritual Needs Of Hospitalized Patients, Douglas Robinson

Doctoral Dissertations and Projects

Hospitalized patients are at an elevated risk of suffering from spiritual distress. Patients value and expect having spiritual and emotional needs met when hospitalized. A direct correlation exists between spiritual and physical health, making spiritual assessment and care a pastoral priority. Research indicates a lack of proper training for pastors making hospital visits. The purpose of this project is to provide pastors with resources and understanding of spiritual assessment of hospitalized patients. This project also provides pastors with a template for a new model of spiritual assessment to aid with establishing a spiritual assessment tool to meet their ministry needs, …

Understanding The In Vivo Uptake Kinetics Of A Phosphatidylethanolamine-Binding Agent 99mTc-Duramycin, Said H. Audi, Zhixin Li, Joseph Capacete, Yu Liu, Wei Fang, Laura G. Shu, Ming Zhao

Biomedical Engineering Faculty Research and Publications

Introduction

^99mTc-Duramycin is a peptide-based molecular probe that binds specifically to phosphatidylethanolamine (PE). The goal was to characterize the kinetics of molecular interactions between ^99mTc-Duramycin and the target tissue.

Methods

High level of accessible PE is induced in cardiac tissues by myocardial ischemia (30 min) and reperfusion (120 min) in Sprague–Dawley rats. Target binding and biodistribution of ^99mTc-duramycin were captured using SPECT/CT. To quantify the binding kinetics, the presence of radioactivity in ischemic versus normal cardiac tissues was measured by gamma counting at 3, 10, 20, 60 and 180 min after injection. A partially inactivated form of …

An Exploration Of The Relationships Among Connectedness To Nature, Quality Of Life, And Mental Health, Peter G. Tauber

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

In recent decades, a new branch of psychology has emerged—ecopsychology. This field looks at the complex relationship between human beings and the natural world. Previous research has shown the importance of direct experiences in nature for the promotion of human health and well-being. However, it is still not understood why these experiences in nature carry so much importance.

It is possible that the concept of connectedness to nature (CTN) plays a role in this relationship between nature and wellness. CTN is defined as feelings of close affiliation with the natural world in a physical, cognitive, and emotional manner. Previous research …

Effects Of Planting Date, Harvest Date, And Environmental Conditions On Germination Of Forage Kochia Accessions, Cody F. Creech

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Forage kochia is used to re-seed areas in harsh environments that have been infested by annual weeds or disturbed by repetitive fires. It is an introduced perennial semi-shrub that is valuable to livestock and wildlife as a forage. The seed of forage kochia is very unpredictable and successful establishment in areas of low precipitation where it is utilized has often been erratic. Forage kochia seeding failures are costly and leave the land vulnerable to further degradation and erosion. This study was conducted to investigate how germination of forage kochia is affected by different harvest and planting dates, age of seed, …

Reinforcer Magnitude And Resistance To Change Of Forgetting Functions And Response Rates, Meredith Steele Berry

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Enhanced memory that is less susceptible to disruption has been demonstrated previously, by presenting more reinforcement for correct responses (e.g., a higher probability of reinforcement) in a conditional discrimination task. The purpose of the present experiment was to extend our current understanding of this phenomenon to a different dimension of reinforcement (i.e., magnitude). This would offer additional techniques for delivery of reinforcement within applied settings (e.g., a classroom) that could promote accurate and persistent memory. The present experiment, therefore, was conducted to investigate the effects of reinforcer magnitude on resistance to disruption of remembering and response rates. Pigeons were exposed …

The Effects Of Habitat Manipulations On Utah Prairie Dogs (Cynomys Parvidens) And Their Habitat On The Awapa Plateau Recovery Area In South-Central Utah, Gretchen Elizabeth Caudill

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Utah prairie dogs have been listed, in some capacity, under the Endangered Species Act since 1972. The lack of suitable habitat, particularly cool season grass cover,
has been identified as the primary factor impeding species recovery. Due to reproduction costs, Utah prairie dogs require a large quantity of cool season grasses. Lack of recovery has also been attributed to poor juvenile survival. Increased resources have been shown to increase weights, which would increase survival through the winter.

Beneficial habitat management techniques for Utah prairie dogs have yet to be determined for the Awapa Plateau recovery area. Utah prairie dogs require …

Estimating Willingness To Pay For Continued Use Of Plastic Grocery Bags And Willingness To Accept For Switching Completely To Reusable Bags, Jarod Dunn

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This thesis demonstrates a surveying method to collect data to obtain tax levels for plastic grocery bag usage. This data was collected through asking respondents about a hypothetical situation in which they were required to pay a tax for using plastic bags or whether they would instead switch to using reusable bags that could be purchased at the grocery store. The respondents were also asked if they already were using reusable bags, how much would the store have to pay them for them to use reusable bags for all grocery shopping trips. From our analysis, people who use reusable bags …

Farmer, Miner, Ranger, Writer: Interpreting Class And Work In The Writing Of Wendell Berry And Edward Abbey, Tyler Austin Nickl

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This study compares some of the essays and novels of two well known, environmental writers: Wendell Berry and Edward Abbey. Usually, these writers are discussed for their environmental politics and representations of nature, but this study examines the ways in which each of these writers discusses class and manual labor. This aspect of Abbey’s and Berry’s works has not yet received the attention it deserves. With this focus in mind, I make the following conclusions: 1) An author’s view of society (as expressed by their opinions of class and socioeconomic status) necessarily affects their view of nature. 2) Berry’s occupational …

Continental-Scale Characterization Of Molecular Variation In Quaking Aspen, Colin M. Callahan

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Quaking aspen has the largest natural distribution of any tree native to North America, ranging from Alaska through the breadth of Canada and south to mid-Mexico. Recent studies suggest a general decline of aspen throughout much of the range since at least the mid-20th century, though these findings remain inconclusive. Regardless, factors such as climate change, periods of drought, soil nutrient deficiencies, pathogens, insects, and encroachment by other tree species all pose risks to the health and maintenance of aspen across the continent. This situation is exemplified in the western United States where climate change is forecasted to have an …

Experimental Studies Of Vertical Mixing In An Open Channel Raceway For Algae Biofuel Production, Ram Sudheer Voleti

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The USU BioEnergy Center has been successful in developing algae feedstocks for renewable biofuels and bioproducts. The concept is to utilize and maximize algae feedstocks for liquid transportation fuels, biomass for burning and digestion, and high value co-products. It is theorized that increasing the mixing in open and closed algal production systems improves the productivity of the algae culture. A raceway cultivation system was chosen to examine the phenomena of mixing. Vertical mixing will provide more uniform exposure to sunlight for all of the algae in the raceway. The main focus of this research was to increase vertical mixing. Delta …

Characterization Of The Involvement Of Integrins, Focal Adhesion Kinase, And Phospholipase C Enzymes Endogenous To The Oocyte In Bovine Fertilization And Oocyte Activation, Benjamin Rand Sessions

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The Center for Integrated Biosystems (CIB) and Animal, Dairy, and Veterinary Sciences (ADVS) Department at Utah State University propose a multi-year molecular study of cattle gamete interactions to improve our basic understanding of fertilization. The CIB and ADVS will utilize existing collaborations in addition to recruiting state and federal funding sources to complete the extensive project.

Various laboratory techniques will be used to discover the molecular players of fertilization in hopes of shedding light on a variety of human infertility issues due to problems at the gamete level. A more complete understanding of fertilization could also lead to the development …

Genetic Characterization Of Fine-Leaved Festuca Valesiaca Germplasm And Evaluation Of Their Relationship To The Festuca Ovina Complex, Yingmei Ma

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Fine-leaved Festuca valesiaca has stress tolerance. However, its agronomic performance in the western United States and its genetic relationship to species of the Festuca ovina complex has not been investigated. Also, natural hybridization makes them difficult to identify. Given the species' potentials, our project was designed to identify Festuca valesiaca accessions that possess high biomass and seed yield and to examine their relatedness with the Festuca ovina complex.

The Festuca valesiaca accessions examined produced many small seeds. Seed production was correlated with the total biomass, plant height, and plant vigor. The Festuca valesiaca accessions examined were shorter than the control …

The Remarkable Life Of Sanak, Roly Russell, Nancy J. Huntly, Spencer Wood, Bruce Finney, Dieta Hanson

Biology Faculty Publications

Life on Sanak is remarkable—from the brilliant orange of lichens clinging to life high on wave-beaten and barren rocks to the raspy bark of an introduced arctic fox or a vole's abstract bouquet of drying tundra flowers. In this chapter we will explore a limited selection of the diverse cast of characters that inhabit the Sanak Islands, ranging from the tiny and cryptic to the large and charismatic.

The Ecological Interactions Of Sanak, Nancy Huntly, Spencer Wood, Roly Russell

Biology Faculty Publications

Ecology is not only about the interesting biology of organisms, as described for Sanak Island in the last chapter, but also about interactions: interactions between animals (including people), plants, microbes, the habitats that they live in, and the environments that surround them. The ecology of Sanak Island today reflects not only today's conditions, but also shows the imprint of the distant history of interactions of the island, especially, as we will see below, the imprint of the Aleut people that have made this island their home.

How Sanak Aleut Fit Into The Intertidal Food Web, Jennifer A. Dunne, Spencer Wood, Roly Russell, Nancy Huntly, Matthew Betts, Herbert Maschner

Biology Faculty Publications

Almost everyone learns about the concept of ecological "food chains" in grade school. An example of a marine food chain is shown on the left-hand side of the chart to the left: phytoplankton are eaten by mussels, which are eaten by octopus, which are eaten by sea otters, which are eaten by humans. These feeding interactions can be abstractly represented as five "nodes" connected in a single chain by four links, as shown on the right-hand side of the diagram to the left. The food chain shown is one of the thousands of interlinked food chains that make up the …

Compulsory Vaccination Laws: Searching For A Policy-Making Process Immune To Bias, Natalie A. Dana

Seton Hall Journal of Legislation and Public Policy

No abstract provided.

Wobble, Said The Hedgehog, Mary Elder

UNLV Theses, Dissertations, Professional Papers, and Capstones

My thesis is called "Wobble, Said the Hedgehog." However, there are also things in it that are neither hedgehogs nor wobbly. These include, but are not limited to, the body, kingship, Catholicism, cats, mice, betrayal between friends, jam, alcohol, badgers, love and the military. There is less actual discussion of sex than one might expect. For the purposes of describing my project as an assembled whole, however, this prospectus will attempt to transcend "badgers" as a summary. (This is not to say that "badgers" isn't a useful signifier. It should be referred to almost as often as "Catholicism.")

II. Image …

Impact Of Secondary Treatment Types And Sludge Handling Processes On Estrogen Concentration In Wastewater Sludge, Erica J. Marti

UNLV Theses, Dissertations, Professional Papers, and Capstones

Endocrine-disrupting compounds (EDCs), such as estrogen, are known to be present in the aquatic environment at concentrations that negatively affect fish and other wildlife. Wastewater treatment plants (WWTPs) are major contributors of EDCs into the environment. EDCs are released via effluent discharge and land application of biosolids. Estrogen removal in WWTPs has been studied in the aqueous phase; however, few researchers have determined estrogen concentration in sludge. This study focuses on estrogen concentration in wastewater sludge as a result of secondary treatment types and sludge handling processes. Grab samples were collected before and after multiple treatment steps at two WWTPs …