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O-Acetylserine Sulhydralase-A from Salmonella typhimurium LT-2: Thermodynamic Properties and SPectral Identification of Intermediates

Description: O-Acetylserine Sulfhydrylase (OASS) is a pyridoxal phosphate enzyme that catalyzes the reaction of O-acetyl-Lserine with sulfide to give L-cysteine. OASS is present as two isoforms, designated -A and -B. The kinetic mechanism of OASS-A is well known and there is also much known concerning the acid-base chemistry of the enzyme. However, little is known concerning the location of the rate determining steps, the sequencing of chemical steps that occur at the active site, or the nature of the rate determining transition states. The studies performed to help elucidate these aspects of the OASS-A mechanism included determination of the thermodynamics of both half reactions, along with studies utilizing substrate analogs of OAS halting the reaction at specific points along the reaction pathway allowing the identification of reaction intermediates. The free energy change of the first half reaction was shown to be -5.7 Kcal/mole while the second half reaction was shown to be, for all intents and purposes, irreversible. Intermediates along the reaction pathway that have been previously identified include the internal Schiff base and the a-aminoacrylate. The external Schiff base was identified using the analogs cysteine, alanine, and glycine while the geminal diamine was identified using the analog serine. Formation of the external aldimine was shown to be pH dependent with a pK of 8.1 ± 0.3 most likely representing a general base that accepts a proton from the a-amine of cysteine to facilitate a nucleophilic attack on C4r of the PLP imine. Formation of the geminal diamine was also shown to be pH dependent with two pK values having an average value of 8.1. One of the groups most likely represents the general base which accepts a proton from the a-amine of cysteine while the second group likely interacts with the amino acid side chain to orientate the amino acid ...
Date: August 1993
Creator: Simmons, James Walter
Partner: UNT Libraries

Active or Passive Voice: Does It Matter?

Description: This thesis reports on the use of active and passive voice in the workplace and classroom through analysis of surveys completed by 37 employees and 66 students. The surveys offered six categories of business writing with ten sets of two sentences each, written in active and passive voice. Participants selected one sentence from each set and gave a reason for each selection. The participants preferred active over passive 47 to 46 percent of opportunities, but they preferred mixed voice over both, 49 percent. The participants preferred active only for memos to supervisors; in the other five categories they preferred passive or mixed voice. Both males and females preferred mixed voice, and age appeared to influence the choices. They cited context as the most common reason for using passive.
Date: December 1993
Creator: Watson, Rose E. (Rose Elliott)
Partner: UNT Libraries

Acts of Survival: the Plight and Prospects of Dallas Theatre

Description: A comprehensive investigation examines the decline and changes that have affected Dallas regional theatre development from the dream of Margo Jones in the 1940s to the proliferation of emerging theatres in 1993. Changing economic conditions, lack of audience support, and shortages of performance space have contributed to an exodus of Dallas actors and artists. Reviewed are measures to reverse this trend, including funding changes, awareness campaigns, improved inter-theatre cooperation, and guidelines for audience development. The study's conclusion notes that theatres do, indeed, have a natural life cycle, but with renewed emphasis on audience development and self-sufficiency, theatres in Dallas can endure and contribute to an enlarged sense of civic pride.
Date: December 1993
Creator: Leeman, Patricia Diane
Partner: UNT Libraries

N-Acylethanolamines and Plant Phospholipase D

Description: Recently, three distinct isoforms of phospholipase D (PLD) were identified in Arabidopsis thaliana. PLD α represents the well-known form found in plants, while PLD β and γ have been only recently discovered (Pappan et al., 1997b; Qin et al., 1997). These isoforms differ in substrate selectivity and cofactors required for activity. Here, I report that PLD β and γ isoforms were active toward N-acylphosphatidylethanolamine (NAPE), but PLD α was not. The ability of PLD β and γ to hydrolyze NAPE marks a key difference from PLD α. N-acylethanolamines (NAE), the hydrolytic products of NAPE by PLD β and γ, inhibited PLD α from castor bean and cabbage. Inhibition of PLD α by NAE was dose-dependent and inversely proportional to acyl chain length and degree of unsaturation. Enzyme kinetic analysis suggested non-competitive inhibition of PLD α by NAE 14:0. In addition, a 1.2-kb tobacco (Nicotiana tabacum L.) cDNA fragment was isolated that possessed a 74% amino acid identity to Arabidopsis PLD β indicating that this isoform is expressed in tobacco cells. Collectively, these results provide evidence for NAE producing PLD activities and suggest a possible regulatory role for NAE with respect to PLD α.
Date: December 1998
Creator: Brown, Shea Austin
Partner: UNT Libraries

An Adaptive Linearization Method for a Constraint Satisfaction Problem in Semiconductor Device Design Optimization

Description: The device optimization is a very important element in semiconductor technology advancement. Its objective is to find a design point for a semiconductor device so that the optimized design goal meets all specified constraints. As in other engineering fields, a nonlinear optimizer is often used for design optimization. One major drawback of using a nonlinear optimizer is that it can only partially explore the design space and return a local optimal solution. This dissertation provides an adaptive optimization design methodology to allow the designer to explore the design space and obtain a globally optimal solution. One key element of our method is to quickly compute the set of all feasible solutions, also called the acceptability region. We described a polytope-based representation for the acceptability region and an adaptive linearization technique for device performance model approximation. These efficiency enhancements have enabled significant speed-up in estimating acceptability regions and allow acceptability regions to be estimated for a larger class of device design tasks. Our linearization technique also provides an efficient mechanism to guarantee the global accuracy of the computed acceptability region. To visualize the acceptability region, we study the orthogonal projection of high-dimensional convex polytopes and propose an output sensitive algorithm for projecting polytopes into two dimensions.
Date: May 1999
Creator: Chang, Chih-Hui, 1967-
Partner: UNT Libraries

Addition, Omission and Revision: the Stylistic Changes Made to Zehn Variationen über ein Präludium von Chopin by Ferruccio Busoni

Description: This study examines what Busoni meant by "formal deficiencies" when he described his 1884 version of Chopin Variations, and reveals that changes made to the 1884 version during its process of revision in 1922 correct the "formal deficiencies" and show a fundamental change in Busoni's compositional style and perception of musical motion. Including a detailed analysis of the modifications, omissions, and additions made to the 1922 version (including an examination of the Chopin Prelude in C minor, op. 28, No. 20 as a theme to reveal aspects of its construction used in the variation process), which shows how these changes affect the work's compositional structure.
Date: December 1994
Creator: Yoon, Soomee
Partner: UNT Libraries

Adhesion/Diffusion Barrier Layers for Copper Integration: Carbon-Silicon Polymer Films and Tantalum Substrates

Description: The Semiconductor Industry Association (SIA) has identified the integration of copper (Cu) with low-dielectric-constant (low-k) materials as a critical goal for future interconnect architectures. A fundamental understanding of the chemical interaction of Cu with various substrates, including diffusion barriers and adhesion promoters, is essential to achieve this goal. The objective of this research is to develop novel organic polymers as Cu/low-k interfacial layers and to investigate popular barrier candidates, such as clean and modified tantalum (Ta) substrates. Carbon-silicon (C-Si) polymeric films have been formed by electron beam bombardment or ultraviolet (UV) radiation of molecularly adsorbed vinyl silane precursors on metal substrates under ultra-high vacuum (UHV) conditions. Temperature programmed desorption (TPD) studies show that polymerization is via the vinyl groups, while Auger electron spectroscopy (AES) results show that the polymerized films have compositions similar to the precursors. Films derived from vinyltrimethyl silane (VTMS) are adherent and stable on Ta substrates until 1100 K. Diffusion of deposited Cu overlayers is not observed below 800 K, with dewetting occurred only above 400 K. Hexafluorobenzene moieties can also be incorporated into the growing film with good thermal stability. Studies on the Ta substrates demonstrate that even sub-monolayer coverages of oxygen or carbide on polycrystalline Ta significantly degrade the strength of Cu/Ta chemical interactions, and affect the kinetics of Cu diffusion into bulk Ta. On clean Ta, monolayer coverages of Cu will de-wet only above 600 K. A partial monolayer of adsorbed oxygen (3L O2 at 300 K) results in a lowering of the de-wetting temperature to 500 K, while saturation oxygen coverage (10 L O2, 300 K) results in de-wetting at 300 K. Carbide formation also lowers the de-wetting temperature to 300 K. Diffusion of Cu into the Ta substrate at 1100 K occurs only after a 5-minute induction period. This induction period increases ...
Date: December 1999
Creator: Chen, Li
Partner: UNT Libraries

Adjustment of Kindergarten Children through Play Sessions Facilitated by Fifth Grade Students Trained in Child-Centered Play Therapy Procedures and Skills

Description: This research study investigated the effectiveness of the application of child-centered play therapy procedures and skills by trained fifth grade students in play sessions with kindergarten children who had adjustment difficulties. Specifically, this research determined if play sessions with trained fifth grade students facilitated change in kindergarten children's self concept, internalizing behavior, and externalizing behavior and their parents' stress level.
Date: May 1999
Creator: Baggerly, Jennifer N. (Jennifer Nalini)
Partner: UNT Libraries

Adlerian Counseling and the Early Recollections of Children

Description: This investigation used a descriptive approach to explore and evaluate early recollection changes of children in Adlerian counseling. The study addressed seven research questions regarding early recollection change for children in Adlerian counseling as compared with children not in Adlerian counseling. The treatment group was engaged in Adlerian counseling for 10 weeks. The investigator conducted pre-counseling and post-counseling interviews to collect six total early recollections from 9 subjects. The comparison group was not engaged in treatment for counseling. The investigator conducted interviews at an interval of 10 weeks to collect six total early recollections from 9 subjects. The Manaster-Perryraan Manifest Content Early Recollection Scoring Manual was used for analysis of early recollection content. Following training sesions, raters scored absence or presence of content variables in early recollections. Tables were employed to reveal findings of early recollection content change as addressed by the seven research questions of this study. A descriptive evaluation of' the data indicated that the treatment group manifested greater change in early recollection content as compared to the comparison group in six of seven research questions. On the basis of these findings, this study concluded that early recollections of children are a valid source of potential in measuring therapeutic progress and are a reliable measure of the thematic apperception of children. The data from this study provide a foundation from which to build the clinical utility of the early recollections of children. In view of these results, this study recommended the routine use of early recollections of children in Adlerian counseling.
Date: May 1990
Creator: Statton, Jane Ellis Porter
Partner: UNT Libraries

Adlerian Life Style and the Myers-Briggs Type Indicator

Description: The possibility of a relationship between Adlerian life style, as measured by the Life Style Personality Inventory (LSPI), and the Myers-Briggs Type Indicator (MBTI) was examined by this research. The goal of this study was to clarify the relationship between these instruments to broaden the applicability of both instruments for both research and clinical endeavors. Life style is a concept which is vital to therapeutic intervention from an Adlerian frame of reference. Assessment of life style typically involves lengthy therapist interviews. Both the LSPI and the MBTI are questionnaires designed to measure personality variables. The 117 subjects for this study were solicited from individuals seeking counseling from an urban community counseling center. The individuals served by this agency are primarily those diagnosed with Adjustment Disorders. The LSPI and the MBTI were administered individually to each subject. Means and standard deviations were computed for the seven LSPI themes and the MBTI total. Due to a lack of research support for Theme 4 by the LSPI author, the data for this theme were disregarded. The same research indicated a strong bipolar relationship for Themes 7 and 8 (Displaying Inadequacy and Social Interest), which prompted the inclusion of Theme 8 in subsequent data analysis. A correlation analysis was developed. Using the correlation matrix, a factor analysis program was run using the SPSS-X statistical package. The principal components analysis extracted three factors which were refined by a factor rotation using the varimax rotation option. To clarify Factor 3, further analysis was performed with the MBTI data divided by continuum and a second factor analysis was run. Four factors emerged from the data with Factors 1 and 2 remaining unchanged. Factor 1 (Emotional Focusing) and Factor 2 (Confrontation) were loaded with the LSPI themes. Factor 3 (Temperament) and Factor 4 (External-Internal) were loaded with the ...
Date: May 1993
Creator: Doss, Carol Rose
Partner: UNT Libraries

Adlerian Personality Priorities of Siblings of Individuals with Tourette Syndrome

Description: This study was designed to examine Adlerian personality priorities of siblings of individuals with Tourette Syndrome (TS). This study aimed to investigate whether a difference exists between TS siblings and siblings of those without disabilities on variables related to personality priorities. It was hypothesized that TS siblings would score significantly higher than the control group on the superiority and pleasing personality priorities and significantly lower on the comfort and control personality priorities. Both of the hypotheses were rejected. First, no significant difference was found between TS siblings and the control group on the superiority and pleasing personality priorities. Second, no significant difference was found between TS siblings and the control group on the comfort personality priority, and TS siblings scored significantly higher than the control group on the control personality priority.
Date: August 1998
Creator: Sims, Deanna
Partner: UNT Libraries

The Administration of Auxiliary Services in Texas Public Universities: Analysis and Proposed Integrated Model

Description: The problem of this study was to develop a model for the administration of auxiliary enterprises in Texas higher education as a cooperative effort of administrators and input from other sources. The purposes were to determine which administrators currently have the responsibility for the management of auxiliary services, to evaluate the correlation between the type of administrator and the concern for fiscal and student needs, to identify problems and opportunities for useful administration, and to develop a model integrating the strengths of each administrator and the implementation of new ideas to improve auxiliary enterprise management. A survey instrument consisting of three types of questions was mailed to both Vice Presidents of Fiscal Affairs and Student Affairs at all 26 four-year public institutions in Texas. Part I questions were informational, designed to determine who administers auxiliary services. Part II consisted of 20 questions on a Likert scale to obtain both opinions on the theories of the research, and specialized knowledge of the administrators. Part III was free response to solicit ideas from the administrators for the construction of the model. Paired t-tests were performed to determine knowledge strengths of the administrators. All other information was presented in frequency tables or narrative summaries.
Date: May 1994
Creator: Yarbrough, Marianne (Marianne June)
Partner: UNT Libraries

Adolescent Discouragement: Development of an Assessment Instrument

Description: The Adolescent Discouragement Indicator (ADI) was developed to assess the Adlerian construct of discouragement. The 75-item ADI contains five subscales corresponding to the five life tasks specified in Individual Psychology and is specifically designed to pinpoint the area and degree of adolescent discouragement. Item selection was based on ratings by five prominent Adlerians and item correlation with subscale scores. Age and sex norms for the ADI were established on 225 females and 299 males 12 to 18 years of age. Findings indicate that female adolescents are less discouraged than male adolescents on all scales except the love scale and both sexes reported the least amount of discouragment on the love scale. The only significant difference among the age groups is between the 13-year-olds and the 15, 16, and 17-year-olds on the love scale. An internal consistency coefficient of .95, a 2-week test-retest coefficient of .89, and a 4-week test-retest coefficient of .92 indicates that the ADI is a reliable instrument. Negative and significant (p < .001) correlations between the ADI and Social Interest Index (Greever, Tseng, & Friedland, 1973) and between the ADI and the Social Interest Scale (Crandall, 1975) contribute to construct validity and support Adler's belief that discouragement and social interest are inversely related. Results of behavioral and academic comparisons on a sample of adolescent males (N=57) seem to indicate a link between behavior, academic performance, and levels of discouragement. Results of factor analysis and interscale correlations are presented. Implications for further research include continued validation using behavioral criteria associated with discouragement, refinement of the subscales and establishment of score ranges to indicate when an adolescent is considered discouraged.
Date: May 1990
Creator: Lingg, MaryAnn
Partner: UNT Libraries

Adolescent Pregnancy: Voices Heard in the Everyday Lives of Pregnant Teenagers

Description: The purpose of this study is to examine the problems that pregnant teenagers encounter at school and at home while they are trying to complete their high school education. Data were collected by in-depth interviews. Twenty pregnant adolescents, who were between the ages of 15 through 18, and were participants in a special teen pregnancy program were interviewed. The major findings in this study included the respondents': 1) unstable family life histories, 2) denial that they were pregnant, 3) need for self-identity as an adult, 4) conflict with parents and 5) motivation to complete their high school education. This study points to the need for more research on the problems that pregnant adolescents encounter in their everyday lives.
Date: December 1995
Creator: Oviedo, Sonia
Partner: UNT Libraries

Adult Age and Ethnicity as Factors in Success on the TASP : A Measurement of the Texas Academic Skills Program (TASP) Test

Description: This study examined the association among ethnicity, age, and scores on selected portions of the TASP and MAPS tests. This study further examined if the TASP could identify students for success in college level course work as well or better than selected portion of the MAPS test.
Date: August 1991
Creator: Friedman, Linda A. (Linda Anne)
Partner: UNT Libraries

Adult Attention Deficit Hyperactivity Disorder Personality Characteristics and Comorbidity

Description: Attention-deficit/hyperactivity disorder (ADHD) is surrounded by confusion and controversy regarding its definition, course, etiology and treatment. Among adults, ADHD is rarely considered a diagnostic reality of primary importance and is often overlooked. This study provides descriptive validity for adult ADHD in distinguishing it from controls, and identifying both a pure condition and one wrought with comorbidity.
Date: August 1998
Creator: Austin, Karla Michele
Partner: UNT Libraries

Adult Christian Education for Baby Boomers: a Descriptive Case Study of Three American Churches

Description: American churches seeking to assimilate baby boomers are struggling to meet the adult educational needs of this group. To determine what models of church-based adult education are used to meet the educational needs of this group, three large, growing American churches known for attracting boomers were identified as sites for research. A qualitative case study research design was used and results were compared using cross-case analysis. Initial data collection included a three-day visit at each church. Data were collected in three phases: Phase One consisted of personal interviews with staff and lay leaders; Phase Two focused on observation of adult education events which took place during the visitation period; Phase Three involved gathering materials that described adult education programs. To optimize the reliability and accuracy of the findings data were subjected to examination by peers, collection methods were applied consistently in each research phase, follow-up contacts were made with each church to verify observations and findings, and case records were created for each site. Eleven categories were selected and the data were presented by category. Within each category, data were delineated and organized into three areas: trends among the churches, noteworthy comments about individual programs, and comparison to the literature in the adult education field.
Date: August 1994
Creator: Donahue, William P. (William Paul)
Partner: UNT Libraries

Adult Discouragement: Parents of Children with Craniofacial Anomaly

Description: The Discouragement Scale for Adults (DSA) was developed to assess for the Adlerian construct of discouragement in adults age 18 years and over. Data were collected from three samples: norm (n=586), presumed discouraged (n=47), and parents of children with craniofacial anomaly (n=105). Five subscales corresponding to life tasks identified in Adlerian literature as work, love, society, self-significance, and spirituality underlie the 60 item DSA. Item selection was based on ratings by five notable Adlerians and item correlations with scale scores. Gender, age, and ethnicity norms were established for the norm, presumed discouraged, and craniofacial samples. Across three samples, no significant ethnic differences were found. Normative findings indicated females are less discouraged than males on the Total DSA, the society and spirituality subscales. Age findings indicated the 18-34 year old sample is more discouraged than other ages on the Total DSA, the work, society, and spirituality subscales. Presumed discouraged findings indicated females are less discouraged than males on the society subscale. Craniofacial findings indicated females are less discouraged on the society subscale, but more discouraged on the self-significance subscale than males. Age findings indicated the 18-34 year old sample is more discouraged than other ages on the self subscale. Research on CPA parents' relationship status, CPA child's birth order, parental role of adult to CFA child, length of time the parent has cared for CFA child, the CFA child's age, CFA parent's education level, and CFA child's craniofacial anomaly diagnosis was conducted. Findings indicated birthmothers are less discouraged than birthfathers on the society subscale, but more discouraged on the self-significance subscale. Internal consistency ratings of the DSA were .9392, .9496, and .9365 for three samples. Correlations to measures of social interest were negative and significant, reflecting an inverse relationship between discouragement and social interest. Factor analysis and interscale correlations are presented. ...
Date: August 1996
Creator: Jones, Melissa Taylor Watson
Partner: UNT Libraries

Adult Discouragement: Traditonal College Students

Description: This study resulted in the development of the Discouragement Scale for Adults (DSA), an assessment instrument for the Adlerian construct of discouragement in adults more than 18 years of age. The DSA is a 60-item instrument that contains five sub-scales corresponding to five life tasks identified in Adlerian literature as work, love, society, self, and spirituality. Age, gender, and ethnicity norms were established for the DSA using a diverse sample (N=586). Additional normative data was developed with a presumed discouraged sample (N=47), and a special sample of traditional college students aged 18-27 years (N=531). Findings on the norm sample indicated that females are less discouraged than males on the Total DSA and on society and spirituality sub-scales. The 18-34 year old group was more discouraged than other age groups on the Total DSA and on work, society, and spirituality sub-scales. Presumed discouraged sample findings indicated that females were less discouraged than males on the society sub-scale. College student findings indicated that females were less discouraged than males on the Total DSA and sub-scales of love, society, spirituality, and work. A significant difference was found among ethnic groups in self sub-scales. Students with no absences per week were less discouraged than students with two absences per week. Students with lower grade point averages (GPA) were more discouraged on the Total DSA and work sub-scales. DSA internal consistency coefficients were .9392, .9496, and .9327 for norm, presumed discouraged, and college student samples respectively. Correlations between DSA and two social interest surveys reflect an inverse relationship between discouragement and social interest. Results indicate that the DSA is a useful assessment instrument for research and counseling purposes with college students. Further research should include greater geographical and ethnic diversity as well as validation among diverse college samples and non-traditional students. Additionally, a standard range ...
Date: December 1996
Creator: Haggan, Paul S. (Paul Stephen)
Partner: UNT Libraries

An Adult Educational Research Model for Developing an Evaluation System for Clergy

Description: Formal job performance evaluation of a church's pastoral staff has been almost nonexistent in many churches. While business and education have been making strides in evaluation techniques during the past three decades, the church is just beginning to notice the need for this kind of accountability and ongoing professional development. In this research, the author applied the evaluation techniques of education to church pastoral staff members. Evaluation can be understood as both a formative process and a summative decision. The steps to planning an evaluation that will be both formative and summative are discussed. Qualifying the ministerial tasks through objective job descriptions will enable the church to quantify the job performance through evaluation. Suggestions are given for developing a ministerial evaluation instrument. In this research a model from educational evaluation was adapted for use in a local church setting. One denomination was selected to demonstrate the process of evaluation development. Denominational governments differ considerably. Therefore, the key stakeholders of the church for the chosen denomination were identified as pastors and church board members. These stakeholders were used as a "panel of experts." The Delphi technique was used to develop consensus from the participants concerning (1) the core skills of ministerial effectiveness and (2) the quality indicators to measure those core skills. This required two rounds, one for identifying the core skills and one for identifying quality indicators. Each round consisted of three surveys. The research identified seven core skills for ministerial effectiveness and a number of quality indicators to measure each core skill. The results were used to demonstrate how an evaluation tool could be developed from the data. This evaluation tool was the consensus of the panel of experts in this study. While the process is a model that could be similar for any church's "panel" of participants, the ...
Date: August 1998
Creator: Burnside, Burnie R.
Partner: UNT Libraries

Adult Survivors of Childhood Sexual Abuse : Characteristics of the Mother-child Relationship

Description: This qualitative study examined the characteristics of the mother-child relationship of adult survivors of childhood sexual abuse at the time of the abuse. The study consisted of data from the McMaster Family Assessment Device (FAD), the Family of Origin Scale (FOS), and a set of structured interview questions designed by the researcher. Autonomy/intimacy concepts from the FOS examined constructs of clarity of expression, responsibility, respect, openness, acceptance of loss and separation, expression of a wide range of feelings, conflict resolution, mood and tone, and empathy.
Date: December 1994
Creator: Motley, Rebecca Roper
Partner: UNT Libraries