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  Partner: UNT Libraries
 Collection: UNT Theses and Dissertations
The North Texas Region and the Development of Water Resources in the Trinity River Basin of Texas, 1840-1998

The North Texas Region and the Development of Water Resources in the Trinity River Basin of Texas, 1840-1998

Date: August 1999
Creator: Sparkman, Michael D.
Description: This study focuses on the development of water resources in the Trinity River basin for navigation, flood control, water supply, recreation, and allied purposes. Special emphasis is given to the development of the upper Trinity River basin through the influence of community leaders in Dallas and Fort Worth. A desire harbored for generations by upper basin residents for creating a navigable waterway on the Trinity River coalesced in the twentieth century into a well organized movement for all facets of water resources development. Sources include correspondence, speeches, and promotional materials of civic leaders, politicians, and other citizens, as well as works by the United States Army Corps of Engineers.
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A Novel Mechanism for Site-Directed Mutagenesis of Large Catabolic Plasmids Using Natural Transformation

A Novel Mechanism for Site-Directed Mutagenesis of Large Catabolic Plasmids Using Natural Transformation

Date: August 2001
Creator: Williamson, Phillip C.
Description: Natural transformation is the process by which cells take up DNA from the surrounding medium under physiological conditions, altering the genotype in a heritable fashion. This occurs without chemical or physical treatment of the cells. Certain Acinetobacter strains exhibit a strong tendency to incorporate homologous DNA into their chromosomes by natural transformation. Transformation in Acinetobacter exhibits several unique properties that indicate this system's superiority as a model for transformation studies or studies which benefit from the use of transformation as an experimental method of gene manipulation. Pseudomonas putida is the natural host of TOL plasmids, ranging between 50 kbp and 300 kbp in size and encoding genes for the catabolism of toluene, meta-toluate, and xylene. These very large, single-copy plasmids are difficult to isolate, manipulate, or modify in vitro. In this study, the TOL plasmid pDKR1 was introduced into Acinetobacter calcoaceticus strains and genetically engineered utilizing natural transformation as part of the process. Following engineering by transformation, the recombinant DNA molecule was returned to the native genetic background of the original host P. putida strain. Specific parameters for the successful manipulation of large plasmids by natural transformation in Acinetobacter were identified and are outlined. The effects of growth phase, total ...
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A Novel Process for GeSi Thin Film Synthesis

A Novel Process for GeSi Thin Film Synthesis

Date: December 2007
Creator: Hossain, Khalid
Description: A unique process of fabricating a strained layer GexSi1-x on insulator is demonstrated. Such strained heterostructures are useful in the fabrication of high-mobility transistors. This technique incorporates well-established silicon processing technology e.g., ion implantation and thermal oxidation. A dilute GeSi layer is initially formed by implanting Ge+ into a silicon-on-insulator (SOI) substrate. Thermal oxidation segregates the Ge at the growing oxide interface to form a distinct GexSi1-x thin-film with a composition that can be tailored by controlling the oxidation parameters (e.g. temperature and oxidation ambient). In addition, the film thickness can be controlled by implantation fluence, which is important since the film forms pseudomorphically below 2×1016 Ge/cm2. Continued oxidation consumes the underlying Si leaving the strained GeSi film encapsulated by the two oxide layers, i.e. the top thermal oxide and the buried oxide. Removal of the thermal oxide by a dilute HF etch completes the process. Strain relaxation can be achieved by either of two methods. One involves vacancy injection by ion implantation to introduce sufficient open-volume within the film to compensate for the compressive strain. The other depends upon the formation of GeO2. If Ge is oxidized in the absence of Si, it evaporates as GeO(g) resulting in spontaneous ...
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Novel Role of Trypsin in Zebrafish

Novel Role of Trypsin in Zebrafish

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Date: May 2013
Creator: Alsrhani, Abdullah Falleh
Description: It has been shown previously in our laboratory that zebrafish produce trypsin from their gills when they are under stress, and this trypsin is involved in thrombocyte activation via PAR2 during gill bleeding. In this study, I investigated another role of the trypsin that is secreted from zebrafish. This investigation has demonstrated a novel role of trypsin in zebrafish. Not only did this investigation demonstrate the role of trypsin in zebrafish behavior, but also it showed that PAR2 might be the receptor that is involved in trypsin-mediated behavioral response. In addition, we have shown that Gq and ERK inhibitors are able to block the trypsin pathway and prevent the escaping behavior. Finally, the results of this investigation suggest that the cells that respond to trypsin are surface cells, which have an appearance similar to that of neuromast cells.
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Las Novelas de Gregorio López y Fuentes

Las Novelas de Gregorio López y Fuentes

Date: 1951
Creator: Fulwider, James H.
Description: This thesis considers the novels of Gregorio Lopez Y Fuentes.
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Novelas Indigenistas Representativas de America

Novelas Indigenistas Representativas de America

Date: May 1969
Creator: Rodríguez, David R.
Description: In this thesis have been included six novels of the indigenous type that represent four countries of Latin America: Mexico, Ecuador, Bolivia, and Peru. This type of novel contains elements of social protest, and therefore it is appropriate to examine the problem of the "indio" or (Indian) in relation to the countries where the majority of the population is comprised of "Indians".
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The Novels of Juan Valera

The Novels of Juan Valera

Date: August 1973
Creator: Davis, Chloanne Cole
Description: This study is an attempt to analyze the novels of Juan Valera y Alcala Galiano, with particular attention to the characterization of the principal figures.
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The Novels of Marta Brunet

The Novels of Marta Brunet

Date: August 1969
Creator: LaFon, Ben H.
Description: It will be the purpose of this thesis to comment upon the eight novels by Marta Brunet. The novels will be examined in detail, giving special consideration to her emphasis on fatalism and destiny, and will examine critical opinion of her work and draw conclusions as to the author's place in the modern Latin American novel.
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The Novels of Shirley Jackson: A Critical-Analytical Study

The Novels of Shirley Jackson: A Critical-Analytical Study

Date: January 1970
Creator: Ferguson, Mary G.
Description: This study will discuss each of Shirley Jackson's six novels. The discussions will concentrate on plot, setting, theme, characterization, and style.
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Novice Generalist and Content teachers’ Perceptions of Contextual Factors Affecting Personal Teaching Efficacy

Novice Generalist and Content teachers’ Perceptions of Contextual Factors Affecting Personal Teaching Efficacy

Date: August 2011
Creator: Hooten, Dorleen Billman
Description: New teachers begin the school year with optimism and enthusiasm, but their excitement quickly wanes as they encounter the realities of the everyday life of a teacher. When they do not experience the successes they predicted, many begin to doubt their capabilities, which results in a lowered sense of teaching efficacy. This descriptive study was designed to identify the contextual factors novice teachers perceive as influences on personal teaching efficacy and to examine the relationships between the factors. Two groups of novice teachers who were concurrently enrolled in a post-baccalaureate accelerated educator preparation program and working as first-year teachers were the participants in the study. Data were gathered for the study through focus group activities, twice weekly journal entries completed during the teaching year, and a culminating “lessons learned” paper written during the last month of the first year of teaching. Each of the two focus groups identified nine contextual factors they perceived to affect personal teaching efficacy. Six factors were identified by both groups: parental involvement, support from administrators and colleagues, classroom discipline, testing results, teaching strategies and outcomes, and relationships with administrators and colleagues. The groups, however, perceived the relationships between the contextual factors differently. The generalists perceived ...
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