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Comparison of Aspartate Transcarbamoylase Activity Between Pseudomonas Aeruginosa Which Has One Chromosome and Burkholderia Cepacia Which Has Three Chromosomes

Comparison of Aspartate Transcarbamoylase Activity Between Pseudomonas Aeruginosa Which Has One Chromosome and Burkholderia Cepacia Which Has Three Chromosomes

Date: August 2012
Creator: Nusair, Arwa Y.
Description: The pyrimidine biosynthetic pathway is essential and similar in all bacteria. The pathway from Pseudomonas is regulated by nucleotides which bind to the upstream region of the pyrBC’ gene complex. Work in our lab mapped the genes and showed that the pyrB and pyrC’ were part of an overlap complex. The Pseudomonas aeruginosa has one circular chromosome. A former Pseudomonas now called Burkholderia cepacia is similar to P. aeruginosa except that it contains three circular chromosomes (CI, CII, CIII) and one large plasmid. The primary chromosome named CI contains the pyrBC’. To our knowledge there has been no report of the activity of ATCase in Pseudomonas and contrasted with that of Burkholderia. Here, we compare the activity of ATCase in P. aeruginosa and B .cepacia. Cells of both organisms were grown in Pseudomonas minimal medium and in Enriched medium. The ATCase was extracted and partially purified from each sample. It is hypothesized that the B. cepacia has greater activity for ATCase than do the Pseudomonas.
Contributing Partner: UNT Libraries
Techniques for Improving Uniformity in Direct Mapped Caches

Techniques for Improving Uniformity in Direct Mapped Caches

Date: May 2011
Creator: Nwachukwu, Izuchukwu Udochi
Description: Directly mapped caches are an attractive option for processor designers as they combine fast lookup times with reduced complexity and area. However, directly-mapped caches are prone to higher miss-rates as there are no candidates for replacement on a cache miss, hence data residing in a cache set would have to be evicted to the next level cache. Another issue that inhibits cache performance is the non-uniformity of accesses exhibited by most applications: some sets are under-utilized while others receive the majority of accesses. This implies that increasing the size of caches may not lead to proportionally improved cache hit rates. Several solutions that address cache non-uniformity have been proposed in the literature. These techniques have been proposed over the past decade and each proposal independently claims the benefit of reduced conflict misses. However, because the published results use different benchmarks and different experimental setups, (there is no established frame of reference for comparing these results) it is not easy to compare them. In this work we report a side-by-side comparison of these techniques. Finally, we propose and Adaptive-Partitioned cache for multi-threaded applications. This design limits inter-thread thrashing while dynamically reducing traffic to heavily accessed sets.
Contributing Partner: UNT Libraries
Principals' Leadership Beliefs: Are Personal and Environmental Influences Related to Self-Efficacy?

Principals' Leadership Beliefs: Are Personal and Environmental Influences Related to Self-Efficacy?

Date: December 2008
Creator: Nye, Gary D.
Description: The purpose of this study was to determine if there was a relationship between principal self-efficacy and personal characteristics, school conditions, and professional preparation among a selected group of Texas, public school principals. The survey instrument included the Principal Self-Efficacy Scale (PSES) developed by Tschannen-Moran & Garies in 2004, and other items. The survey instrument was electronically distributed to a random sample of 965 Texas, public school principals. From that population, 289 principals completed the survey for a response rate of 30%. Statistical Package for the Social Sciences (SPSS) was used for the analyses which included descriptive statistics, correlations, and analysis of variance. Additionally, factor analysis and reliability were calculated for the PSES. The factor structure and reliability found in this study closely mirrored the results of earlier investigations, providing further support for the reliability and validity of the PSES. Out of 12 variables examined in relation to principal self-efficacy, a statistically significant relationship was found for gender, years of teaching experience, level, SES, parental involvement, and student discipline. However, all six of the statistically significant variables had a small effect size indicating limited practical significance. The results of this study support the need for continued research of principal self-efficacy ...
Contributing Partner: UNT Libraries
A comparison of aural and visual instructional methodologies designed to improve the intonation accuracy of seventh grade violin and viola instrumentalists.

A comparison of aural and visual instructional methodologies designed to improve the intonation accuracy of seventh grade violin and viola instrumentalists.

Date: May 2002
Creator: Núñez, Mario Leoncio
Description: The purpose of the study was to compare two instructional methodologies designed to improve the intonation accuracy of seventh grade violin and viola instrumentalists. The collection of data was in regard to (1) instructional methodology: aural and aural/visual, (2) performance tasks: A, B, and C; (3) individual pitches (seven from each of the music tasks), and (4) differences between instrument groups: violin and viola. Sixty-eight seventh grade string students from three string classes of two middle schools were randomly assigned to two experimental groups: (a) aural and (b) aural/visual. The instructional period was implemented daily in ten-minute sessions during twenty days by the orchestra instructors of each school. A pretest-posttest format was used to determine if there were any changes in the subjects' intonation accuracy from prior to after the instructional phase was implemented, and if these changes could be attributed to any of the methodologies. The testing material used on both testing sessions included three performance tasks composed of seven notes each. Subjects were recorded on both testing occasions. The data were the scores of absolute pitch deviation, measured in cents from equal temperament, from the pre- and postest; these were treated with analysis of variance. The ANOVA on ...
Contributing Partner: UNT Libraries
Formation of a Receptive Vocabulary and its Effect on the Rate of Acquisition of its Expressive Counterpart in an Autistic Child

Formation of a Receptive Vocabulary and its Effect on the Rate of Acquisition of its Expressive Counterpart in an Autistic Child

Date: December 1972
Creator: O'Banion, Dan R.
Description: The purpose of this study was to examine the relationship between receptive oral expressive vocabularies. It was hypothesized that receptive discrimination pretraining has a greater influence on the reate of acquisition of its expressive vocal counterpart as compared to the reate of vocal acquisition of words without receptive pretraining.
Contributing Partner: UNT Libraries
The Interface of Personality Processes and Cognitive Abilities: A Comparative Study of Elderly and Young Adults

The Interface of Personality Processes and Cognitive Abilities: A Comparative Study of Elderly and Young Adults

Access: Use of this item is restricted to the UNT Community.
Date: August 2000
Creator: O'Brien, Dina Paige Ragow
Description: Although research has shown that the complex constructs of intelligence and personality are necessarily intertwined, studies exploring this issue in elderly individuals are rare. The importance attached to this interface in older adults becomes particularly clear in light of the debate over the cause and extent of age-related decrements in cognitive performance as well as whether such losses can be ameliorated or not, especially given societal shifts toward increased life expectancies. The present study explored the basis for shifts in personality-ability relationships in adulthood by comparing two samples of older adults, one of which was assessed in 1975 (N = 102, M age = 68.4), and the second of which was assessed in 1995 (N = 100, M age = 72.0), and a sample of younger adults (N = 100, M age = 21.8), also assessed in 1995. Each participant was administered the Holtzman Inkblot Technique and the Gf-Gc Sampler, a measure of crystallized (Gc) and fluid (Gf) abilities. LISREL analyses of both age-related and historical shifts in personality-ability relationships suggested that not only were such shifts associated with cohort differences as reflected in factor loading (lambda) differences between the older samples and the younger sample, as well as between ...
Contributing Partner: UNT Libraries
A Comparison of the Guilford-Zimmerman Temperament Scales of Psychiatric and Non-Psychiatric Registered Nurses for Use in Personnel Selection

A Comparison of the Guilford-Zimmerman Temperament Scales of Psychiatric and Non-Psychiatric Registered Nurses for Use in Personnel Selection

Date: August 1964
Creator: O'Brien, John Jude
Description: The problem of this study was to determine if psychiatric registered nurses differ significantly in certain personality and temperament trait characteristics from non-psychiatric registered nurses. The characteristics investigated were scores make on the individual scales of the Guilford-Zimmerman Temperament Survey.
Contributing Partner: UNT Libraries
An Exploration of the Relationship between Worry and Other Verbal Phenomena

An Exploration of the Relationship between Worry and Other Verbal Phenomena

Date: May 2008
Creator: O'Brien, Karen M.
Description: This study hypothesized a direct relationship among three verbal phenomena: derived relational responding, verbal intelligence, and worry. It also hypothesized that experiential avoidance would mediate the relationship between derived relational responding and worry. Overall, results from this study failed to support a relationship between worry and the other two verbal phenomena, however, results did support a relationship between derived relational responding and verbal intelligence. Additionally, results indicated a significant relationship between experiential avoidance and worry. Future research should clarify the relationship among the three primary variables of interest, improve measurement of these variables, be more sensitive to external validity, and promote the study of acceptance-based treatments that target experiential avoidance.
Contributing Partner: UNT Libraries
A Comparative Study of the D Cells of Certain Mammalian Islets of Langerhans

A Comparative Study of the D Cells of Certain Mammalian Islets of Langerhans

Date: August 1954
Creator: O'Brien, Larry Joe
Description: The purpose of this study is to describe and compare the D cells of the islets of Langerhans in six different species of mammals.
Contributing Partner: UNT Libraries
The List

The List

Date: December 2009
Creator: O'Brien, Tanner Chase
Description: The List is a collection of short stories focusing on the inability to adapt, or learn from self-destructive patterns, and the bizarre ways people reach out for one another when they don't know what else to do.
Contributing Partner: UNT Libraries