Digital Commons Network^™

Statmod: A Tool For Interfacing Arcview® Gis With Statistical Software To Facilitate Predictive Ecological Modeling, Christine M. Garrard

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

As geographical information systems and spatial data become more accessible, predictive spatial modeling in ecology is becoming more common. Unfortunately, not all ecologists possess the necessary skills to successfully combine statistical models and geographical information systems. In response to this problem, I wrote an extension for ArcView^® GIS called StatMod. This extension interfaces ArcView GIS with SAS^® and S-PLUS^® statistical software and walks the user through creating and mapping logistic regression and classification and regression tree models.

StatMod was then used to run a series of analyses that would have been difficult without such a tool. A …

Patterns And Processes Of Population Differentiation In The Chuckwalla (Sauromalus Obesus) In Southern Nevada, Paul C. Ustach

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

I examined both present-day and historical patterns in the herbivorous desert lizard, Sauromalus obesus (chuckwalla), within the Mojave Desert ecoregion in Nevada. My goal was to determine the process or processes that led to their present-day distribution. I expected to recover distinct haplotypes unique to each mountain range. These unique haplotypes were expected to reveal a pattern of geographic partitioning with sequence divergence among populations increasing as a function of distance. I characterized the distribution of chuckwallas in Nevada by means of a simple model using a geographic information system (GIS). This simple model was used to enhance sampling efficiency …

Affinity Purification And Characterization Of E. Coli Molecular Chaperones, Seung-Hee Nam

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The molecular chaperones are a group of proteins that are effective in vitro and in vivo folding aids and show a well documented affinity for proteins lacking tertiary structure.

Heat-induced Escherichia coli BL21 cell lysate (10 mg protein) was applied to immobilized ɑ-casein (45 mg/g beads) or β-casein (30 mg/g beads) column. After removing a majority of nonspecifically bound proteins with 1 M NaCl, the molecular chaperones were eluted with cold water, 1 mM Mg-ATP, or 6 M urea. Western analysis identified five Escherichia coli molecular chaperones including DnaK, DnaJ, GrpE, GroEL, and GroES. Among samples, ATP eluates showed the …

Physiological Importance Of 1,25(Oh)2D3 Membrane-Initiated And Nuclear Actions In Chickens As A Function Of Growth, And Maturation In Male And Female Chickens, Birgitta Larsson

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

It is well established that l,25(OH)₂D₃ is a major regulator of calcium homeostasis. The steroid exerts its effects on its target organs by two mechanisms, a slow mechanism mediated by nuclear vitamin D receptors (nVDR), and a rapid mechanism mediated by the l,25(OH)₂D₃ membrane-associated rapid response steroid binding protein (l,25D₃-MARRS bp). In this dissertation, the physiological relevance of membrane initiated steroid signaling was investigated by studying the correlation of age in male and female chickens with the magnitude of responses to l,25(OH)₂D₃ in duodena from 7-, 14-, 28-, and …

The Relationship Between The Educational And Occupational Aspirations Of Latino Youth And Their Parents, Andrew O. Behnke

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This study used the qualitative technique of focused interviewing to understand the educational and occupational aspirations of ten Latino youth and their parents in a small town in rural Utah. The qualitative nature of this study allowed for an in-depth look into each parent's aspirations for themselves and for their youth, each youth's aspirations, the barriers to aspirational attainment for both parents and youth, the perceived parental support in these families, and their perceived needs for aspirational attainment. This study used two open-ended interview forms and a 12- question demographic questionnaire to collect data from each of the 30 persons. …

Psychoeducation Groups For Parents Adopting Special-Needs Children, Korinne Knowlton Bouwhuis

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This thesis evaluated training groups for adoptive parents of special-needs children. It was hypothesized that training would influence parenting stress, stress symptoms, and marital satisfaction, and that helpfulness of training sections would depend upon the status of the participants' children (i.e., foster, adopted, or adoption in process). Data were collected from 15 participants who were sampled through agencies that typically interact with adoptive parents.

Repeated measures ANOYAs were computed to compare scores on the PSI/SF Parental Distress Subscale, OQ-45, and RDAS across three time intervals. No significant differences were found. Data from a scale of helpfulness were analyzed using descriptive …

The Role Of Parents As Formal Math Instructors Of Prekindergarten Children, Monica Jane Blanch

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This study was designed to explore the relationship between maternal attitudes about math, mothers' attitudes about their prekindergarten child's math abilities, mother-child math interactions, and prekindergarten children's math achievement. Using a Vygotskian framework, an intervention was developed. An intervention group of 18 mother-child dyads from Hyrum, Utah, area and a comparison group of 17 mother-child dyads from the Weston, Idaho, area were invited to participate in this research project. Measures included the Early Mathematics Concepts (EMC) assessment, the School Readiness Composite (SRC) of the Bracken Basic Concepts Scale-Revised (BBCS-R), My Attitudes Scale (MAS), and My Attitudes About My Child's Abilities …

Parents' Marital Quality And Interactions In Relation To Child Well-Being, Spencer C. Leavitt

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Using a large national data set, this study was among the first to examine direct associations between parents' marital relationships and children's emotional, academic, and behavioral characteristics. The mediating effect of children's home environments, as well as relationships between children and parents, also were analyzed. The research design was longitudinal. Marital variables were measured in 1994, intervening variables in 1996, and children's outcome variables in 1998. It was expected that children would be influenced by three different aspects of their parents' marriage: marital happiness, marital interactions, and marital arguments. The parent/child relationship (parent/child closeness) and the children's home environments were …

Fear Of Crime And Perceptions Of Law Enforcement Among American Youth, Bruce K. Bayley

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Fear of crime and the public's satisfaction with police has been a focus of criminologists for a number of years. Most studies, however, have focused on the general population as a whole. What is not known is how fearful American youth are of the crime in their neighborhoods and how they perceive those in law enforcement. The purpose of this study was to explore this subgroup of the population and to begin the investigation of youths' fear of crime and their perceptions of law enforcement.

Using a national sample of 1,897 youth ages 16-25 collected from 12 cities throughout the …

Post-Tillage Dynamics Of Soil Structural And Hydraulic Properties Induced By Capillary Forces And External Loading, Teamrat Afewerki Ghezzehei

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Tillage modifies the soil structure to create conditions favorable for plant growth. However, the resulting loose structure is susceptible to collapse by internal capillary forces and external compactive stresses with concurrent changes in soil hydraulic properties. Presently, limited understanding of these complex processes often leads to consideration of the soil plow-layer as a static porous medium. The objective of this dissertation was to develop physically based modeling of soil structural dynamics at the pore scale, based on soil mechanical and rheological properties. The basic geometrical framework of the models was based on regular packing of monosized spherical aggregates forming unit-cells. …

Correlates Of Antidepressant Medication Compliance Use Among Depressed Women, Pamela Linton

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Medication compliance/noncompliance was examined in context of: severity of symptoms; medical side effects; medication education; perceived stigma; and effects on family/social support system. A null hypothesis was formulated for each correlate, stating that those patients who reported a high level of an independent variable (IV) would not be any more likely to discontinue their medication than patients who reported a low level of an IV. To obtain data, a medical usage questionnaire and a depression, assessment (OQ™-45.2) were used. Statistical significance was not obtained for any of the hypothesized relationships but trends were consistent with the established literature. The implication …

Juvenile Females Who Sexually Offend: A Beginning Typology, Jason M. Nelson

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This study was broken into two sections, the first being a comprehensive meta-analysis describing a profile of the juvenile female who sexually offends. The second section was the collection of data of juvenile females who sexually offend in the State of Utah. After the data were collected, a profile was described and compared to that found in the Review of the Literature and a typology was presented.

Ecosystemic legacies were shown to be passed down from one generation to the next. The juveniles were found to come from highly chaotic homes, and subject to maltreatment. Diagnostically, they show symptoms of …

Recreation, Livestock Grazing, And Protected Resource Values In The Grand Staircase-Escalante National Monument, Lael Palmer

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This thesis reports the results of a project which identified differences in characteristics of Grand Staircase-Escalante National Monument user groups as they related to their perceptions of how they experience the Monument as recreationists. It explored opinions of four groups: hikers vs. hunters and pre-designation users vs. post-designation users. Responses of these groups were compared for attribution of perceived resource damage, feelings of crowding, acceptability of management action, and importance of identified monument values to their visit. In addition, characteristics of the users were examined to determine if demographic characteristics accounted for differences in perception toward the resources. Finally, how …

Establishing Reinforcing Properties In Neutral Stimuli Through Observational Learning With Children, Andrew Waine Gardner

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The purpose of this study was to observe and analyze the factors that lead to a child's increase in responding to a previously neutral stimulus after observing another child's behavior and consequences in the same setting. The effects of five video presentations on rate of button-pressing responses were observed across four students. Rates of button-pressing behavior on an FR3 schedule of reinforcement were collected for each student using a computer and a metal apparatus with two flat push buttons. Each student completed two baseline phases to establish neutrality of stimuli, and viewed a total of five video presentations. Each video …

Internalizing Symptoms In Adolescents: Assessment And Relationship To Self-Concept, Sue Ann Dowd

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Internalizing disorders cause serious psychological problems for many adolescents. The effects can be both debilitating and long lasting. However, assessment of internalizing disorders has been plagued by limited measurement strategies. Historically, individual measures were developed to assess the narrow-band symptoms that are subsumed under the broad construct of internalizing disorders (e.g., depression, anxiety, somatic complaints, and social withdrawal). Recently, the Internalizing Symptom Scale for Adolescents has been created. The Internalizing Symptom Scale for Adolescents is a short screening measure that includes newer models of affect such as the tripartite model of affect. Additionally, there has been limited research on the …

The Minnesota Multiphasic Personality Inventory-2 And Low Back Pain Surgery Outcome, David S. Shearer

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Chronic back pain is a serious problem in the U.S. for which about 10% of back pain sufferers will undergo elective surgery. Unfortunately, back surgery is not successful in alleviating back pain in a substantial number of surgery patients. Various psychological and psychosocial variables have a demonstrated relationship to back surgery outcome. The most widely used personality test used to predict back surgery outcome is the Minnesota Multiphasic Personality Inventory (MMPI). Past research has shown that elevations on three MMPI clinical scales (Hs, D, and Hy) are positively correlated with poor back surgery outcome. The current prospective study shows a …

Testing Models Of Depression And Paranoia In Men And Women: The Role Of Cognitive Style, Guilt, Shame, And Defense Mechanisms, Chad Sombke

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Gender differences in psychopathology have long been of interest in the fields of clinical, developmental, and personality psychology. Lewis proposed two models to explain the emergence of the development of gender differences in depression and paranoia. Lewis stated that gender differences in depression and paranoia can be traced to corresponding gender differences in cognitive style, guilt-proneness, shame-proneness, and the use of specific defense mechanisms. Although research evidence has validated certain components of these two models, neither model has ever been tested in its entirety. This research project intended to test Lewis's models in their entirety by utilizing structural equation modeling. …

The Effect Of Parental Divorce On Young Adult Women's Marital Attitudes, Anne Catherine Schmidt

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This study examines how the experience of a parent's divorce during adolescence affects young adult women's attitudes about relationships, marriage and divorce.
Research questions looked at how participants felt about marriage, their relationship with their parents following the divorce, and how the experience of parental remarriage shapes attitudes about marriage. Fifteen young adult women were interviewed.

The most significant findings were that experiencing a parental divorce leads to
fee lings of ambivalence about marriage. Religious beliefs and positive role models can alleviate some of the negative feelings about marriage that may be present following a parental divorce. Experiencing parental conflict …

Perceived Family Relationships Associated With Coming Out Of Mormon Male Homosexuals, Brad Benson

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This study is one of the first to include data from both male homosexuals and their family members to investigate disclosure of sexual orientation. Being homosexual in U.S. society can be particularly traumatic for males because strong pressures oppose the violation of masculine gender norms. Being homosexual and Mormon has unique complications. Reactions from the Mormon community toward individuals of homosexual orientation is defined by prevailing attitudes toward homosexuality, which are largely based on existing theories of etiology, attribution of etiology, and the religious and cultural beliefs extant in the community. The role of family relationships in the coming out …

Development Of A Bird-Avoidance Model For Naval Air Facility El Centro, California, Edward J. Zakrajsek

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Bird strikes (collisions between birds and aircraft) pose a significant threat to aviation safety. For example, Naval Air Facility El Centro, California, lost an F-18 jet to a bird strike in October 1995. To help combat the bird-strike threat at Naval Air Facility El Centro, I developed a bird-avoidance model as a risk-management tool for the installation. It can be used to schedule flights at NAF El Centro and its two associated practice-bombing ranges during times of low-bird activity. I calculated bird-strike risks and published them in web-page format on both the installation's server and the USGS/Utah State University, College …

Biochemistry And Application Of Exopolysaccharide Production In Mozzarella Cheese Starter Cultures, Brent Petersen

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This study sought to investigate the role of the C₅₅ undecaprenol lipid carrier in the production of exopolysaccharide (EPS), the effect of exopolysaccharide producing (EPS⁺) starter cultures on the viscosity of Mozzarella cheese whey, and the possible protective characteristics of capsular EPS against freezing and freeze drying. Efforts to investigate the role of the lipid carrier in EPS production employed pAMbacA, a plasmid that encodes an enterococcallipid kinase that confers bacitracin resistance by increasing intracellular levels of undecaprenol phosphate lipid carrier. Unfortunately, this avenue of study was thwarted by the inability to demonstrate bacA …

The Effects Of Parental Modeling On The Health-Related Behaviors Of American Indian Adolescents: A Culturally Specific Investigation Of Social Learning Theory, Amy Jo Williams

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Health-compromising behavior is a leading cause of death among American Indian (Al) adolescents. Examples of these behaviors include: smoking, alcohol consumption, drug use, and lack of seatbelt use. Theories that predict which Al youth are most at risk for executing these behaviors are needed.

Social learning theory (SL T) has shown adolescents' behaviors are sometimes highly correlated with their parents' behaviors across different ethnic groups. However, there has been little previous research done with Als.

The present study attempted to determine if SLT was applicable to Al adolescents and their parents with regard to four health-related behaviors: cigarette smoking, alcohol …

Benthic Invertebrate Assemblage Structure In Mountain Streams: The Influence Of Spatial Scale Of Observation And Organism Size On Relationships With Environmental Factors, James N. Hogue

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The description of pattern in nature depends on the size and scale of both the observer and the phenomena being observed. The relative influence that different environmental factors have on organism distributions depends not only on scales of variation inherent to each factor, but also on the size and scale of the organisms. 

I used data from 649 sites within 45 mountain streams in California to quantify relationships between environmental factors and organism distribution. I compared these relationships across analyses conducted at different spatial and biotic scales of resolution. I also examined relationships between environmental variation and assemblage size structure …

Morphometric Evaluation Of The Whitefish Complex In Bear Lake, Utah/Idaho, Alan Ward

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Whitefish populations around the world have long been difficult to categorize taxonomically. The whitefish of Bear Lake, Utah/Idaho are no exception. There are three recognized species of Prosopium that are endemic to the lake. Two of these species, Prosopium spilonotus and Prosopium abyssicota, have previously been indistinguishable outside of spawning times. Previous studies have proposed additional taxa within P. spi/onotus to further complicate the identification among these taxa.

Morphological characteristics were quantified on wild whitefish from Bear Lake, as well as from progeny reared in the laboratory from the wild adult fish. The purported taxa were separated in the field …

Female Adolescent Role Models And Body Image, Tracy L. Funk

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This study primarily examined the relationship between role model choices and body image of female adolescents. More specifically this study sought to examine the relationship between the reasons that adolescent females give for choosing a role model and body image. Because body image dissatisfaction has been found to be associated with self-esteem and eating disorders such as anorexia and bulimia nervosa, these variables also were investigated. Body image was examined by using two measures of the body image construct· the Figure Rating Scale and the Multidimensional Body-Self Relations Questionnaire (MBSRQ). Both were used in order to capture a greater portion …

Therapeutic Benefits Of A Wilderness Therapy Program And A Therapeutic Community Program For Troubled Adolescents, Kreg J. Edgmon

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Wilderness therapy is increasingly seen as a viable treatment alternative for troubled youth, yet there is a noticeable dearth of research comparing the effectiveness of wilderness therapy with more traditional treatment programs. To help address this research need, this study conducted an exploratory analysis of the therapeutic benefits of a wilderness therapy program, Wilderness Quest (WQ), compared to a therapeutic community program, Life-Line (LL). The WQ and LL programs both are based on a 12- step recovery philosophy and emphasize the integral role of the family in adolescent treatment.

The study employed a qualitative methodology, beginning with an extended period …

Language, Social Interactions, And Attention As Predictors Of Reading Development In Second Grade, Lisa A. Newland

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Social interactions between 153 mother-infant dyads in the laboratory were examined for associations with language and play preferences when infants were 14 months old. Later associations with reading skills, attention, and book reading were examined at the end of second grade. Mothers and infants were videotaped in a 20-minute laboratory observation at 14 months, and joint visual attention and social toy play were coded from the interactions. Language was assessed at 14 months using a standardized instrument, and mothers rated their own and their infants' preferences for specific types of play. A follow-up study, conducted at the end of second …

Reproductive Allocation And Survival In Grasshoppers: Effects Of Resource Availability, Grasshopper Density, And Parasitism, David Heath Branson

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

A major challenge in ecology is to understand intraspecific variation in life histories. Variation in resource availability can lead to differences in reproductive allocation and life histories. Grasshoppers are a good organism for the study of variation in life histories, since they exhibit life history plasticity in response to biotic and environmental factors. An optimality model for grasshoppers was developed that predicts optimal total allocation to reproduction and optimal effort-per-offspring as functions of resource availability and mortality. Relative allocation to reproduction is predicted to increase with resource availability, while relative allocation to survival declines. A resource-based trade-off between egg size …

Rangeland Resources Monitoring: Concepts And Practical Applications, Benny R. Bobwski

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

How does one person manage and monitor a half million acres of rangelands towards a sustainable future? Through a journey that begins with the understanding of sustainability, I explore the monitoring concept, two of its applications, and summarize with an emphasis on the art and science of management. Sustainability is a concept that confuses many managers because it is so complex. However, if one considers adaptability as the complement to sustainability, and realizes that an adaptable organism is a sustainable organism, then a manager can relate because the emphasis shifts from that of stability for the future to that of …

Energy, Fractal Movement Patterns, And Scale-Dependent Habitat Relationships Of Urban And Rural Mule Deer, Mark F. Mcclure

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

I studied the behaviors, movement dynamics, habitat relationships, and population characteristics of Rocky Mountain mule deer (Odocoileus hemionus) using urban and rural winter ranges in Cache Valley, Utah, from January 1994 to February 1998. There were 2 goals to my research endeavors. The first was to assess how and why the behaviors and demographic characteristics of urban deer differed from those of rural deer. The second was to assess the scale-dependent responses to habitat and the scale-dependent patterns of habitat use by deer living in each area. To accomplish the first goal, I compared the prevalence of migration, the spatial …