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Identification of environmental determinants of behavior disorders through functional analysis of precursor behaviors

Methods for the determining the functional properties of problem behaviors are necessary for the design of successful treatments. Many of the currently utilized methodologies are chosen based on their speed, ease of application or for the perceived risk-reduction they afford. However, when thoroughly analyzed many of these methods fall short of their intended purpose. The current study attempted to assess dangerous problem behavior through a functional assessment of functionally related precurs… more

Date: May 2001

Creator: Churchill, Robert

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

Fathers' and mothers' childcare ideas and paternal childcare participation.

The relationship between fathers' and mothers' gender-role ideas and fathers' level of participation in general housework has been well documented. Data from a study in 1998 were used to explore specific aspects of this relationship. In particular, fathers' and mothers' genderrole ideas with regard to childcare (childcare ideas) was examined to see whether these ideas influence paternal childcare participation. Specifically, what impact they had on performance of childcare tasks and the time fa… more

Date: May 2001

Creator: Fletcher, Ryan G.

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

An NMR study of 2-ethyl-1-butyllithium and of 2-ethyl-1-butyllithium/lithium 2-ethyl-1-butoxide mixed aggregates

A 1H, 13C, and 6Li NMR study of 2-ethyl-1-butyllithium indicated that 2-ethyl-1-butyllithium exists only as a hexameric aggregate over the entire temperature range of 25 to - 92.1 ° C in cyclopentane. Reacting 2-ethyl-1-butyllithium with 2-ethyl-1-butanol resulted in alkyllithium/lithium alkoxide mixed aggregates, apparently of the form Ra(RO)bLia+b. A multinuclear, variable temperature NMR study of samples with O:Li ratios of 0.2 and 0.4 showed, in addition to the alkyllithium, the formation o… more

Date: May 2001

Creator: Ferreira, Aluisio V. C.

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

The uninvestigated factors: Dimensions of personality and psychopathology in sex offenders

Understanding the relation between personality characteristics, psychopathology, and sexual offenses can contribute to developing more effective treatment interventions. Previous research with sex offenders has focused on general personality traits or inconsistently classified sex offenders based on psychopathology. It was hypothesized that combining personality and psychopathological traits can assist in understanding sex offenders. The current study evaluated 88 male sex offenders in a court-… more

Date: May 2001

Creator: Briley, Josh

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

Media Influence on Executive Police Decision-Making: A Case Study of Police and Media Interaction During the Oklahoma City Bombing Investigation and Trials

Because media influence public opinion, it is often surmised that media also influence the decisions of police executives. This exploratory case study examined the relationship between police and media during the Oklahoma City bombing investigation and subsequent trials of Timothy McVeigh and Terry Nichols. Findings indicate that media influence police executive decisions when police and media interact closely. It was found that during the Oklahoma City bombing investigation and trials, police… more

Date: May 2001

Creator: Bellew, Steven S.

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

Disturbing the Peace

Disturbing the Peace is a short, 16mm sync-sound fiction film. Alone one stormy night, a woman must contend with an intruder breaking into her home. The intruder turns out to be a teenage boy. He claims to have broken in only to retrieve a family heirloom he hid there when he and his parents lived in the same house years ago. When the boy finds the heirloom, the woman begins to believe his story, and soon realizes he doesn't have a good home life. The boy asks permission to stay until the storm… more

Date: December 1997

Creator: Hatton, William, 1972-

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

GABAᴀ Receptors in Rat Whisker Barrel Cortex: Effects of Sensory Deprivation

The GABAergic system in adult sensory cortex is affected by sensory deprivation, but little is known about how this predominant inhibitory system is affected during ontogeny. The present study investigates developmental effects of whisker trimming on GABAa receptors in rat barrel cortex. Rats trimmed for 6 wk beginning at birth and adulthood showed similar decreases in [3H]muscimol binding in deprived relative to non-deprived barrels, suggesting absence of a critical period.

Date: August 1995

Creator: Salazar, Eduardo, 1962-

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

The Effects of Project PACE on Adolescent Females' Physical Activity Readiness

This study evaluated the effects of Project PACE, a program designed to increase physical activity, on the physical activity level and selected psychosocial variables of sedentary adolescent females ages 12 to 18. Psychosocial variables included self efficacy, attitude, perception of barriers, perceived social support, and knowledge. Of the 69 participants, 40 were enrolled in the treatment group and 29 were enrolled in the control group at the start of the study. The only significant differenc… more

Date: May 1998

Creator: Williams, Christy Nicole

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

N-Acylethanolamines and Plant Phospholipase D

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 mar… more

Date: December 1998

Creator: Brown, Shea Austin

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

Construction of a Physical Map of Moraxella (Branhamella) catarrhalis Strain ATCC25238

In order to gain a better understanding of this microorganismand its role in human pathogenesis, a physical map of Moraxella catarrhalis type strain ATCC25238 was constructed using pulsed field gel electrophoresis (PFGE) in combination with Southern hybridization techniques. Restriction endonucleases Not I, Rsr II, and Sma I were used to digest the chromosomal DNA. An overlapping circular map was generated by cross-hybridization of isolated radiolabeled fragments of Moraxella catarrhalis genomi… more

Date: May 1999

Creator: Nguyen, Kim Thuy

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

Upper and Lower Temperature Tolerances of Three Freshwater Game-Fish Species Exposed to Cycling Temperatures

A total of 670 critical thermal maxima (CTMax) and minima (CTMin) were determined for three freshwater fishes acclimated to three constant temperatures and a diel regimen cycling between the lowest and highest acclimation temperatures. In all species temperature tolerance was directly related to acclimation temperature and slopes relating these variables indicate that acclimation temperature has a greater influence on tolerance of low rather than high temperatures. CTMax and CTMin values genera… more

Date: August 1995

Creator: Currie, Rebecca J. (Rebecca Jean)

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

Attenuation of Escherichia Coli Aspartate Transcarbamoylase Expressed in Pseudomonas Aeruginosa Mutant and Wild Type Strains

No apparent repression of pyr gene expression in Pseudomonas aeruginosa is observed upon addition of exogenous pyrimidines to the growth medium. Upon introduction of the subcloned Escherichia coli pyrBI genes for aspartate transcarbamoylase (ATCase) into a P. aeruginosa pyrB mutant strain, repression was observed in response to exogenously fed pyrimidine compounds. The results proved that it is possible to bring about changes in pyrimidine nucleotide pool levels and changes in transcriptional r… more

Date: December 1994

Creator: Liu, Haiyan, 1966-

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

Evaluation of a Constructed Wetland to Reduce Toxicity from Diazinon at the Pecan Creek Wastewater Treatment Plant, Denton, TX

The City of Denton Pecan Creek Wastewater Treatment Facility has periodically failed effluent toxicity testing. A Toxicity Identification Evaluation has determined that Diazinon in the effluent is contributing to the observed toxicity. Chlorpyrifos is also implicated as a factor. The City of Denton constructed a half acre experimental wetland to remove Diazinon related toxicity. Results from spiking and microcosm experiments indicate that the wetland can reduce the Diazinon.

Date: May 1996

Creator: Baerenklau, Amy L. (Amy Lyn)

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

Timed vs. Untimed Initiation Intervals and the Effects of Confidence on a Golf Putting Task

Low, moderate, and high handicap golfers, while wearing glasses with a blinder on the side, attempted 9 putts differing in length from 5 to 21 ft under timed (less than 3.5s from grounding of club to initiation of back swing) and untimed conditions in a counterbalanced design. Confidence ratings were taken prior to and following each putt. The results revealed a significant condition by handicap group interaction (p=.021). The lower handicap group had a more consistent and lower initiation inte… more

Date: August 1999

Creator: Sundberg, Jeffrey D.

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

Heat Shock Proteins in Ascaris suum

Ascaris suum were exposed to a number of stressors, including heavy metals and both high (40°C) and low (18°C) temperatures. The 70kD and 90kD heat shock proteins (HSPs) in the different A. suum tissues were analyzed by Western blot and quantitated by Macintosh Image Program.

Date: August 1995

Creator: Chao, Sheng-Hao

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

Subcloning and Nucleotide Sequence of the xylO/PUWCMA Region from the Pseudomonas putida TOL Plasmid pDK1

The TOL plasmids of Pseudomonas putida encode enzymes required for the oxidation of toluene and other related aromatic compounds. These genes are organized into two operons, the xylUWCMABN operon (upper), and the xylXYZLTEGFJQKIH operon (lower). Here we report the nucleotide sequence of a 7107 bp segment of the TOL pDK1 plasmid encoding the region just upstream of the "upper" operon through the genes encoding xylUWCMA. Sequence analysis, comparison of base-usage patterns, codon-usage patterns, … more

Date: December 1997

Creator: Guigneaux, Michelle M. (Michelle Marie)

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

A Comparison of Predicted and Actual Trophic Status of Lake Ray Roberts, Texas Based on Chlorophyll A

Two years before impoundment, the trophic status of Lake Ray Roberts was predicted by applying the total phosphorus input into the Organization for Economic Cooperation and Development (OECD) eutrophication model. Predicted mean summer epilimnetic (MSE) chlorophyll a of Elm Fork arm, Isle duBois arm and Main Body were in the eutrophic category of the OECD model. Observed MSE chlorophyll a two years after impoundment of Elm Fork arm, Isle duBois and Main Body had not reached their predicted mean… more

Date: May 1999

Creator: Lytle, Lili Lisa

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

Commitment as an Indicator of Turnover in First Line Manufacturing Supervision

Organizational commitment is most commonly defined as a measure of an employee's commitment to the company or larger organization. In a longitudinal study, the Organizational Commitment Questionnaire was administered to 123 first line manufacturing supervisors in a defense contracting firm. After a one year check, subjects were grouped into categories of voluntary and involuntary turnover. The results suggest that significant relationships exist among the variables of departmental commitment, t… more

Date: August 1994

Creator: Tuggle, Tamara K. (Tamara Kay)

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

A Laboratory Study of the Asiatic Clam (Corbicula fluminea Müller) as Influenced by Substrate, Food Source and Water Type

Growth of Corbicula fluminea was monitored in the laboratory. Three experiments were conducted. Experiment I utilized three substrates and one food type. Experiment II utilized three substrates and two food types. Experiments I and II were conducted to determine if substrate type or food type effected growth. Experiment III used no substrates, one food type and was conducted to determine growth response to different types of water. Clams were maintained in three substrates: sand, gravel and cla… more

Date: May 1995

Creator: Halbrook, Courtney (Courtney Ann)

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

Parent Responses to the Birth and Rearing of a Child with Down Syndrome : The Application of Engel's 3-stage Theoretical Model of Grieving

The purpose of this study was twofold: 1) To analyze the similarities and differences between parent responses to the birth and rearing of a child with Down syndrome and; 2) To document the characteristics of grieving described in Engel's 3-stage model of grieving. A questionnaire was used to assess responses from randomly chosen parent members of the Dallas Down Syndrome Guild. Qualitative data analysis was conducted, using the methodology of triangulation.

Date: August 1995

Creator: Smith, Jenette L.

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

Alcohol Use, Violence, and Psychological Abuse in Intimate Relationships

Women in distressed relationships who had sustained severe psychological abuse and either no, moderate, or severe violence from their partner were included (N = 93). Men's and women's alcohol use did not differ with level of violence. Different patterns were found in the moderate violence group regarding women's beliefs about their partner's substance problem, men's psychological abuse, and the relationship of men's and women's quantity of alcohol use and times intoxicated. Uncertainty resultin… more

Date: August 1998

Creator: Falla, Karen M.

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

Examining the Relationship between Variability in Acquisition and Variability in Extinction

Using the "revealed operant" technique, variability during acquisition and extinction was examined with measures of response rate and a detailed analysis of response topography. During acquisition, subjects learned to emit four response patterns. A continuous schedule of reinforcement (CRF) for 100 repetitions was used for each pattern and a 30 min extinction phase immediately followed. One group of subjects learned the response patterns via a "trial-and-error" method. This resulted in a wide r… more

Date: December 1997

Creator: Neff, Bryon (Bryon R.)

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

Site Directed Mutagenesis of β-Ketoadipate Succinyl-Coenzyme A Transferase II from Acinetobacter Calcoaceticus

The role of specific amino acid residues in β-ketoadipate succinyl-coenzyme A transferase II from Acinetobacter calcoaceticus was investigated. A 1412 base pair BamiHI-EcoRI fragment carrying the catIJ genes was amplified by polymerase chain reaction and inserted into pUCl9 to generate the plasmid pCATEl9. Escherichia coli DH5α (pCATEl9) carrying only the catlJ genes expressed 3-fold higher enzyme activity than the parent strain. Two mutants were constructed by site directed mutagenesis so that… more

Date: August 1993

Creator: Sheng, Mei

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

The Effects of Modeling, Roleplaying and Feedback on the Performance of Teachers of Children with Autism

Teachers providing treatment to children with autism are responsible for implementing numerous procedures. Teacher training has not been addressed extensively in the literature. This study employed a multiple baseline design to evaluate the effects of a training package incorporating modeling, roleplaying and feedback on teacher performance. Results indicated that the teacher implemented correct teaching episodes following training. Changes in teacher performance were only observed when the tra… more

Date: August 1999

Creator: Edwards, Carla Ward

Item Type: Thesis or Dissertation

Partner: UNT Libraries