Digital Commons Network^™

Uptake And Transformation Of Trichloroethylene By Hybrid Poplar: Laboratory Studies, Julie K. Chard

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Trichloroethylene (TCE) was widely used as an industrial solvent and degreasing agent for most of the twentieth century. It is now a widespread groundwater contaminant. Phytoremediation may be a cost-effective cleanup method for TCE-contaminated soils and groundwater. Studies of environmental TCE fate are complicated by its volatility. The literature reports both significant and insignificant plant uptake of TCE. Conflicting findings may be due to differences in exposure level, conditions, and duration of the studies, or to experimental artifacts from laboratory systems.

This research quantified plant uptake and volatilization of TCE using a unique laboratory system. Hybrid poplar trees were exposed …

Evaluating Snowmelt Runoff, Infiltration, And Erosion In A Sagebrush-Steppe Ecosystem, Eric K. Duffin

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Production of low-level radioactive waste (LLRW) has created a need for safe storage facilities. These facilities must be capable of isolating radioactive waste and preventing contamination from physical or biological intrusion until the waste material is isotopically stable. At the present time, managers of the Idaho National Engineering and Environmental Laboratory (INEEL) have a substantial database characterizing rainfall events and the subsequent impact on integrity of shallow land burial sites used for storage of LLRW. Little information has been gathered describing the processes of snow accumulation/ablation and the resulting impact on storage facilities. This study examines snowmelt runoff, infiltration, and …

Prevalence And Possible Causes Of Vitamin B-6 Deficiency Among Women In The Philippines, Siew Sun Wong

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Recently maternal intake of multivitamins has been associated with a reduced risk of orofacial clefts (OFC) in human epidemiologic studies. In the Philippines, vitamin B-6 deficiency was found to be associated with increased risk of OFCs. The birth prevalence of OFCs in the Philippines is among the highest known, but Filipino emigrants in the United States have lower rates, indicating that environmental factors may play an important role in causing OFCs in the Philippines.

The prevalence and possible causes of vitamin B-6 deficiency were investigated through dietary and biochemical assessments in case-control study in Negros Occidental, Philippines. Mothers with OFC …

Energy Conservation With Irrigation Water Management, Robert Hill

All Current Publications

Irrigators in Utah experienced rapidly increasing energy costs from the mid 1970s to the late 1980s. These costs remain relatively high. Those who are pumping from deep wells are particularly interested in ways to cut back on energy use without doing away with profitability or production

Relating Children's Social Competence To Maternal Beliefs And Management Strategies Of Peer Relationships, Eryn D. Hamel

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This study explored the links between maternal beliefs about the importance of children's social skills, modes of obtaining social skills, management strategies, and children's social competence. Subjects were 67 mothers whose 3- and 4-year-old children attended one of five preschools in Cache Valley, Utah. Mothers completed questionnaires assessing their beliefs about the importance of social skills, their beliefs about how children acquire social skills, and the ways they are involved in their children 's peer relationships. Demographic measures were also completed by the mothers. Classroom teachers completed the Child Behavior Scale on every child in their class, regardless of maternal …

Temperament, Attachment, And Parenting Stress In Infancy: Relations To Social Competence Of Second Graders, Gina A. Cook

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The importance of social competence in children's development has been recognized, and evidence has been found that children who are socially incompetent are at risk for academic problems. Yet the influences that may be involved from infancy, such as temperament and attachment, have not been explored longitudinally. The purpose of this study was to investigate the influence of infant temperament characteristics on later social development and to explore the idea that this influence may be affected by the infant's attachment security mediated by parenting stress.

Eighteen-month-old infants, from a previous study, were studied as second graders to examine whether their …

Forced Sexual Intercourse In Relation To Female Adolescents' Risky Sexual Behavior, Psychopathology, And Behavior Problems, Mathew Christensen

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

During 1995, over 20,000 adolescents completed the in-home interview for The National Longitudinal Study of Adolescent Health (Add Health). One question asked females if they had ever been forced to have sexual intercourse (FSI). In addition, they were asked about other sexual behavior, their psychological well-being, and behavior problems. The present study examines the associations between FSI and 26 outcome variables, comparing adolescent females who reported FSI with females who reported voluntary intercourse, and with females who reported no intercourse. In addition, the large Add Health sample allowed comparisons between five race/ethnicity groups and four adolescent groups broken down by …

Containment To Enlargement: America's National Security Policy, Linda J. Thayne

Undergraduate Honors Capstone Projects

With the demise of the Cold War, an internationalist philosophy towards national security has gained prominence among many of the political, social and economic leaders of the United States. Internationalists believe that the United States has a new role of advancing global peace and prosperity. This internationalist perspective has led to a reformulation of the United States' national security agenda. This thesis reviews the administrations new philosophical outlook on national security by examining the core premises and structural framework contained in the administrations new foreign policy agenda. The paper will briefly examine the motivation behind the reshaping of U.S. foreign …

Conceptual Education Master Plan For The Utah Botanical Center: Part One: Natural Resources, Gregory J. Wright

All Graduate Plan B and other Reports, Spring 1920 to Spring 2023

The purpose of this study was to assess the needs of four potential target audiences that would be using the Utah Botanical Center (UBC) for educational purposes. The target audiences included school children, college students, nursery and landscape industry, and the general public. The UBC is relocating to a larger site that has wetlands and ponds. The UBC has taken this opportunity to define its mission and goals. Part of its mission is to broaden its educational programming from horticulture based to programming including natural resource conservation topics. This study provides recommendations regarding what educational topics should be covered at …

Evaluation Of A Collaborative Model Using A Case Study Analysis Of Watershed Planning In The Intermountain West, Gary Bentrup

All Graduate Plan B and other Reports, Spring 1920 to Spring 2023

Planning methods that involve collaboration are gaining popularity and currently being applied in a variety of resource management issues . Based on current planning theory, researchers have proposed a conceptual collaborative model for environmental planning and management . This thesis evaluates the usefulness of the model to describe the range of factors important for the establishment and operation of collaboration in environmental planning. This iterative model suggests that collaboration emerges from a series of antecedents and then proceeds sequentially through problem setting, direction setting, implementation, and monitoring and evaluation phases. The evaluation was based on three case studies of watershed-based …

Home Range (?) Of The Flat-Tailed Horned Lizard Phrynosoma Mcallii, Peggy Anderson Miller

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Area used by male and female Phrynosoma mcallii (Hallowell) was studied in a population located on the Barry M. Goldwater Aerial Gunnery Range near Yuma, Arizona. Area used by males and females shifted through time and did not fit the definition of home range. Summer male and female area used was not significantly different (F=2.625, df=1, P=0.131), but male areas used were significantly larger for 15-day time periods (F=9.67, P=0.0003). Males overlapped the area they occupied in consecutive 15-day time periods more often than did females. Female area used never overlapped within a 15-day time period. Male area used overlapped …

Growth Of Clostridium Sporogenes Pa3679 In A Vacuum-Packaged Meat-Vegetable Product, Julie M. Racz

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Clostridium sporogenes PA 3679 spores were inoculated into a meat-vegetable mixture before extrusion, cooking, and vacuum packaging into "stewsticks" to simulate Clostridium botulinum growth. The experiment was a 3 x 5 x 2 x 3 factorial which determined the influence of pH, water activity, initial spore load, and storage period on spore survival. Spore levels decreased throughout storage for all treatments. Spore levels decreased linearly (P = 0.02) as water activity increased, in samples that were heated to kill vegetative cells and activate spores. Other significant interactions of heat-treated samples were observed with inoculum level (P < 0.01) and storage time (P < 0.01). Spore levels in stored products were also significantly affected by water activity * inoculum level (P = 0.03), pH * time, water activity * time (P = 0.01), inoculum level * time (P < 0.01), and water activity * inoculum levels * time (P < 0.01). The interaction between pH * water activity * time tended towards significance (P = 0.06). Most probable number estimates in nonheated samples accounted for naturally occurring viable cells and spores, and added spores and were significantly affected by the main effects of inoculum level (P < 0.01) and time (P < 0.01). The two-way interactions of water activity * inoculum level (P = 0.04), pH * inoculum level (P < 0.01), water activity * time (P < 0.01), and three-way interaction of pH * inoculum level * time (P = 0.03) were significant. Spore levels approached 10², or less …

Influence Of Carbohydrate Starvation On The Culturability And Amino Acid Utilization Of Lactococcus Lactis, Mark R. Stuart

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Lactococci are widely used in the cheese industry as a starter culture. Starter cultures face carbohydrate starvation due to the absence of a fermentable carbohydrate in the cheese curd after pressing. Starvation leads to a decreased ability to synthesize ATP, generate a proton motive force, and accumulate nutrients necessary to maintain viability. The aim of this work was to investigate the culturability of lactococci grown with and without lactose in a chemically defined medium, and to define the metabolic changes that occur during carbohydrate starvation.

Lactose metabolism provided energy for logarithmic phase growth and greater cell density in L. lactis …

Influence Of Commercial Starter Media On Biochemical Characteristics Of Lactococcus Lactus, Norman Bart Devries

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Five strains of Lactococcus lactis were inoculated individually into six commercial bulk set growth media, 11% non-fat dry milk (NDM), and Elliker's broth. After growth in each medium the strains were tested for rate of acid production, and activities of proteinase, aminopeptidase, and lipase/esterase. Growth in commercial starter media significantly influenced acid production rate (P = 0.040), aminopeptidase activity (P < 0.0001), and lipase/esterase activity (P < 0.0001) .

For selected strain/media combinations, the duration of induced aminopeptidase and lipase/esterase activity was followed. The chosen strains were grown in selected commercial bulk set media, reinoculated into 11% NDM, and enzyme activity was examined for five successive …

In Vitro Growth Of Muscle Satellite Cells Isolated From Normal And Callipyge Lambs, Beatriz T. Rodriguez

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The muscle hypertrophy of lambs expressing the Callipyge phenotype is possibly linked to characteristics of their muscle satellite cells. Therefore, characteristics (proliferation, fusion %, and protein accretion) of cultured satellite cells isolated from the longissimus muscle of Callipyge (n = 3) and normal (n = 3) lambs were compared in this study. In the first experiment, we tested whether or not the lll proliferation rates differ for satellite cells isolated from Callipyge or normal sheep when cultured in the presence of different serum types (horse, normal lamb, or Callipyge lamb). The average population doubling time (PDT, h) during log phase …

Hydrogeomorphic Factors Influencing Clonal Recruitment Of Cottonwoods In Mountain Valleys, Michael D. Roberts

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Riparian cottonwoods (populus spp.) are keystone pioneer species that contribute to critical streamside and in-stream habitats, water quality, and aesthetic and recreational value. Land use and river regulation have caused a widespread reduction in the extent and regeneration of this genus. The majority of research on Populus species' reproduction has examined seedling recruitment that dominates in wide alluvial valleys. In contrast, I evaluated reproductive strategies of Populus angustifoliain mountain valleys. Research was conducted in northern Utah on the Little Bear River, a gravel-bedded stream that flows north out of the Bear River Range onto deposits of Ancient Lake …

Student Stress: An Analysis Of Stress Levels Associated With Higher Education In The Social Sciences, Darcy A. Keady

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

A university sample of 238 undergraduate and graduate students between the ages of 19 and 58 completed the Student Stress Measure. Specifically, upper-division undergraduate students and clinical/nonclinical graduate students in social science programs (FHD, Social Work, Sociology, Psychology) were measured for stress level differences due to their particular academic requirements.

Results indicate that, overall, graduate students are more stressed than undergraduate students. Of the graduate students, Sociology students were most stressed in terms of Lifestyle stress scores. The comparison of clinical and non-clinical graduate students shows that there is no difference in stress levels. The Psychology and MFT graduate student …

Adolescent Protective Factor Attainment: An Exploratory Study Of Two Select Populations, Victor W. Harris

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Eighty-four adolescents responded to the survey administered for this study. Thirty-eight members were from the nonadjudicated community sample (e.g., from a semirural Utah community); 46 members of a juvenile court adjudicated group (e.g., juveniles from Cache County, Utah, who were currently on probation) also responded to a paper-pencil survey asking about protective/deficit factors and involvement in problematic behaviors.

Results illustrate the differences in levels of protective/deficit factors and problem behaviors attained between these two convenience samples for a number of variables. The findings showed that the nonadjudicated group consistently reported higher levels of protective factors and lower levels of problem …

Using Maslow's Needs Model To Assess Individuals' Attitudes Toward Money, Mark D. Oleson

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Few things occupy as central a place in our lives as money. Although the study of money has a long history in the behavioral sciences, others have only recently begun examining this important topic. The purpose of this study was to explore the relationship between basic human need levels and money attitudes in a university-age cohort utilizing a theory of hierarchical needs. Needs theory, introduced by Abraham Maslow, suggests that as we interact with the environment we accumulate specific needs that motivate us to respond to life experiences.

Three hundred thirty-eight college students attending Utah State University satellite campuses responded …

Four Levels Of Sexual Involvement, And Their Association With Dating Patterns, Family Relationships, And Other Related Factors, Bruce H. Monson

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This study examined four levels of sexual involvement among adolescents. Levels of sexual involvement were (1) adolescents who had experienced sexual intercourse; (2) adolescents who had been involved in petting but had never had intercourse; (3) adolescents who had made out but had never petted or had sexual intercourse; and (4) adolescents who had never made out, petted, or had sexual intercourse. The sample consisted of 308 eleventh graders from a semi-rural area of the state of Utah.

Dating patterns, particularly early age at first date, were found to be significantly associated with most levels of sexual involvement. Early age …

Fathers And Sons: An Examination Of Distancing Patterns During Adolescence, Mark Ogletree

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Although there has been a new wave of research on fathering, little has focused specifically on the father and son relationship during adolescence. Previous research has documented that fathers and their daughters tend to distance themselves and disengage at the onset of menarche; however, the study and analysis of what happens to fathers and sons during the onset of puberty has been practically neglected. Several studies through the mid 80s and early 90s documented that parents and children tend to separate during adolescence, but only scant research has been conducted since that time. The goal of this study was to …

Influence Of Type Of Supplemental Carbohydrate On Ruminal Responses And Methane Output From Ruminants Consuming Low-Quality Forage, Raul J. Lira

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

In a completely randomized design with a factorial arrangement, three energy supplements and two species (cows and ewes) were evaluated in two identical experimental periods: gestation and lactation. The three supplement treatments were a control, barley, and sugar beet pulp (SBP). The basal diet was tall wheatgrass straw (5.52% CP).

Forage and total dry matter intake (FDMI and TDMI, respectively) interacted (P=.04) with species, supplements, and physiological stages.

An interaction of physiological stage and sampling time occurred for pH. Supplement and sampling time interacted for butyric acid proportion and total VFA concentration.

Diet digestibility displayed an interaction between …

A Survey Of The General Public Assessing Public Attitudes Toward Animal Damage Control Management Policy, Douglas K. Reiter

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

A mail survey of randomly selected stratified U.S. households assessed general attitudes toward wildlife and specific concerns about wildlife damage management and the federal Animal Damage Control program. Respondents strongly supported federal government's role in ensuring public safety, engaging in public education, and continuing research into nonlethal control methods. Weaker support was found for lethal control of predators and crop depredators, and financial compensation for losses due to wildlife activities was generally opposed. Lethal methods of control were generally considered to be inhumane and nonlethal methods humane. When asked to rank the importance of factors to be considered when selecting …

Ultraviolet-B Radiation: Effects On Pollen Of 34 Taxa, And Inheritance Patterns And Carryover Of Radiation Response In Arabidopsis, Javad Torabinejad

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Although considerable research has addressed effects of elevated ultraviolet-B (UV-8) radiation on vegetative plant structures and processes, the reproductive biology and patterns of inheritance of UV-B tolerance have received much less attention. I examined the effects of UV-B radiation on pollen of 34 taxa. I also addressed questions concerning the patterns of inheritance of UV-B tolerance in Arabidopsis thaliana and examined potential cumulative carryover effects of UV-B exposure through multiple generations of this species.

In the first study, a significant reduction in pollen germination occurred in only five species, but pollen tube growth in more than half of the species …

Efficacy Of Guard Llamas (Lama Glama) In Reducing Canid Predation On Domestic Sheep, Laurie E. Meadows

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Predation, especially by canid predators, is a significant cause of sheep loss for many producers. In recent years, the use of llamas to protect sheep from predators has gained recognition as a depredation control method. I conducted a field experiment to test the effectiveness of llamas in reducing canid predation on domestic sheep. Twenty-one llamas were placed with Utah sheep producers. Data collected from these flocks over 20 months were compared to similar data collected from flocks without llamas. Comparisons between treatment and control flocks included (1) proportion of flocks with losses to predators, (2) mean predation rates on ewes …

The Impact Of The Ideal Thin Body Image On Women, Nicole Hawkins

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Researchers and clinicians have postulated that the thin-ideal image portrayed in the media leads to body dissatisfaction and negative self-appraisals among women; however, there is little research that has directly examined the effects of these images on women. The purpose of this research investigation was to experimentally examine the effects of exposure to the thin-ideal on women's affect, self-esteem, body satisfaction, and level of internalization of the thin body image. This study also assessed how the thin-ideal image differentially impacted women with a diagnosed eating disorder. College women (N = 145) were randomly exposed to photographs from popular magazines …

Navajo Adolescent Pregnancy: Identifying Ecocultural Factors Among Adolescent Mothers And Their Infants, Jessiline Anderson

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Understanding the adaptational responses and ecocultural niche of the Navajo adolescent mother from her perspective provides a richness of information about a little-studied population. The overall purpose of this study was to explore the ecocultural factors determined to be significant in the decision of a Navajo adolescent mother to remain in high school or drop out of high school. Thirty Navajo adolescent mothers recruited from two small reservation towns in eastern Arizona participated in the study. Navajo adolescent mothers in the study participated in a one and one half hour semistructured accommodations interview, and completed a Family Resource Scale and …

Effects Of Perceived Sugar Or Chocolate Intake On Self-Reported Food Cravings, Mood States, And Food Intake: A Double-Blind, Placebo-Controlled Study, Lara J. Schultz

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Many dieters and compulsive overeaters report that sugar and chocolate are the most commonly craved foods. Further, many individuals have proclaimed themselves to be "addicted" to sugar or chocolate. It remains unclear, however, what factors lead to report of specific food addictions. A number of researchers have suggested that highly repetitive consumption of sugar and chocolate may result from various physiological processes (e.g., neurochemical imbalances, glucose/insulin malfunctioning). However, there is also considerable evidence that psychosocial factors (i.e., expectancies, classical, and operant conditioning) play the major role in the development and maintenance of excessive sugar/chocolate intake. Empirical studies examining factors that …

The Effects Of Gender And Behavior On Elementary Teachers' Attributional Assumptions About Children With Attention Deficit Hyperactivity Disorder, Lisa Rollins

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Questionnaires compromised of (a) a description of a child (either male or female) exhibiting attention deficit hyperactivity disorder (ADHD) behaviors (either predominately hyperactive/impulsive or predominately inattentive) and (b) 13 questions about the description were completed by 562 regular elementary education teachers in the state of Utah. The questions, which offered teachers a range of responses on a 5 point Likert scale, were designed to assess the extent to which the gender and behaviors of the child described affected the extent to which teachers were able to identify the child as being representative of a child with ADHD, teachers' attributional assumptions …

A Social Analysis Of Grazing Management On National Forest Lands: A Case Study In Catron County, New Mexico, Alexis S. Watts

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The rural west in this country faces increased national pressure concerning the management of natural resources on public lands. Issues regarding natural resource management are becoming more important as they continue to affect rural communities and capture the attention of a variety of interest groups. Natural resource managers are increasingly required to consider social dimensions of resource use and management. Lack of consideration in these areas can lead to dissatisfied, and even hostile, local residents and interest groups. Often land managers face criticism from many groups at once as a result of management decisions.

This study analyzed a particular resource …