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 Collection: UNT Theses and Dissertations
Manipulating Sucrose Proton Symporters to Understand Phloem Loading

Manipulating Sucrose Proton Symporters to Understand Phloem Loading

Date: August 2013
Creator: Dasgupta, Kasturi
Description: Phloem vascular tissues transport sugars synthesized by photosynthesis in mature leaves by a process called phloem loading in source tissues and unloading in sink tissues. Phloem loading in source leaves is catalyzed by Suc/H+ symporters (SUTs) which are energized by proton motive force. In Arabidopsis the principal and perhaps exclusive SUT catalyzing phloem loading is AtSUC2. In mutant plants harboring a T-DNA insertion in each of the functional SUT-family members, only Atsuc2 mutants demonstrate overtly debilitated phloem transport. Analysis of a mutant allele (Atsuc2-4) of AtSUC2 with a T-DNA insertion in the second intron showed severely stunted phenotype similar to previously analyzed Atsuc2 null alleles. However unlike previous alleles Atsuc2-4 produced viable seeds. Analysis of phloem specific promoters showed that promoter expression was regulated by Suc concentration. Unlike AtSUC2p, heterologous promoter CoYMVp was not repressed under high Suc conc. Further analysis was conducted using CoYMVp to test the capacity of diverse clades in SUT-gene family for transferring Suc in planta in Atsuc2 - / - mutant background. AtSUC1 and ZmSUT1 from maize complemented Atsuc2 mutant plants to the highest level compared to all other transporters. Over-expression of the above SUTs in phloem showed enhanced Suc loading and transport, but against ...
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Manuel M. Ponce: A critical study of his Concierto Romántico for piano and orchestra.

Manuel M. Ponce: A critical study of his Concierto Romántico for piano and orchestra.

Date: August 2007
Creator: Vázquez, Carlos Balam
Description: The Concierto Romántico for Piano and Orchestra is one of Manuel M. Ponce's outstanding compositional accomplishments from his Romantic period, reflecting both the state of Mexican music at the turn of the 20th century, and his early nationalist tendencies. However, it remains the only concerto in Ponce's output in need of a more comprehensive analysis. This treatise focuses on a global investigative that examines descriptive and analytic references to the work, as well as a comparison and clarification of the existing score sources. An analytical and stylistic musical study using conventional theoretical techniques leads to a musicological interpretation of the work's extra-musical meaning, based on close assessments of Ponce's compositional practice and social principles.
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The Map and the Territory in the Poetry of Wallace Stevens

The Map and the Territory in the Poetry of Wallace Stevens

Date: December 2009
Creator: Thompson, Erik Robb
Description: In this dissertation, Wallace Stevens' imagination-reality problem as depicted in his poetry is discussed in terms of an eco-critical map-territory divide. Stevens's metaphor of "the necessary angel" acts to mediate human necessity, the map, with natural necessity, the territory, in order to retain contact with changing cultural and environmental conditions. At stake in this mediation are individual freedom and the pertinence of the imagination to the experience of reality. In Chapter 2, the attempt at reconciliation of these two necessities will be described in terms of surrealism. Stevens's particular approach to surrealism emphasizes separating and delineating natural necessity from human necessity so that through the poem the reader can experience the miracle of their reconciliation. In Chapter 3, this delineation of the two necessities, map and territory, will be examined against Modernist "decreation," which is the stripping bare of human perception for the purpose of regaining glimpses of the first idea of the external world. And in Chapter 4, Stevens's approach to the problem of the map-territory divide will be considered against his alienation or internal exile: balancing nature and identity through mediating fictions results in a compromised approach to the marriage of mind and culture in a historically situated ...
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Map-based cloning of the NIP gene in model legume Medicago truncatula.

Map-based cloning of the NIP gene in model legume Medicago truncatula.

Date: May 2007
Creator: Morris, Viktoriya
Description: Large amounts of industrial fertilizers are used to maximize crop yields. Unfortunately, they are not completely consumed by plants; consequently, this leads to soil pollution and negative effects on aquatic systems. An alternative to industrial fertilizers can be found in legume plants that provide a nitrogen source that is not harmful for the environment. Legume plants, through their symbiosis with soil bacteria called rhizobia, are able to reduce atmospheric nitrogen into ammonia, a biological nitrogen source. Establishment of the symbiosis requires communication on the molecular level between the two symbionts, which leads to changes on the cellular level and ultimately results in nitrogen-fixing nodule development. Inside the nodules hypoxic environment, the bacterial enzyme nitrogenase reduces atmospheric nitrogen to ammonia. Medicago truncatula is the model legume plant that is used to study symbiosis with mycorrhiza and with the bacteria Sinorhizobium meliloti. The focus of this work is the M. truncatula nodulation mutant nip (numerous infections and polyphenolics). The NIP gene plays a role in the formation and differentiation of nodules, and development of lateral roots. Studying this mutant will contribute knowledge to understanding the plant response to infection and how the invasion by rhizobia is regulated. Previous genetic mapping placed NIP ...
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Marcel Mihalovici: A Critical Evaluation of His Solo and Chamber Works for Clarinet, A Lecture Recital, Together with Three Recitals of Selected Works by Bozza, Uhl, Martino, Sowerby, Kalliwoda, Bax, and Others

Marcel Mihalovici: A Critical Evaluation of His Solo and Chamber Works for Clarinet, A Lecture Recital, Together with Three Recitals of Selected Works by Bozza, Uhl, Martino, Sowerby, Kalliwoda, Bax, and Others

Date: December 2006
Creator: Evans, Garry Windel
Description: The clarinet works of Marcel Mihalovici (1898-1985) represent significant contributions to the twentieth-century clarinet repertoire. Metric and rhythmic variability, melodic primacy, counterpoint, structural clarity, and elements of Romanian folk music permeate his writing and reflect a highly developed musical language. Mihalovici's educational background and cultural heritage provide important clues toward understanding his artistic legacy. His clarinet works are musically demanding and contain some of the most technically challenging passages in the repertoire, while at the same time, exhibit a distinctively French style influenced by traditional Romanian music. Mihalovici's writing follows familiar but variable formal procedures and conveys a diverse, modally influenced approach to tonality. While his harmonic language is frequently dissonant, his clarinet music offers a unique variety of musically rewarding styles.
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Margaret Dale, Adapting the Stage to the Screen: Aesthetic, Appropriation, and Intimacy in Ballet Programming for Post-War BBC Television

Margaret Dale, Adapting the Stage to the Screen: Aesthetic, Appropriation, and Intimacy in Ballet Programming for Post-War BBC Television

Date: December 2010
Creator: Escue, Jessica Margaret
Description: This thesis examines the aesthetic of ballets adapted for BBC Television by producer Margaret Dale, beginning with her entrance to the BBC's training program in 1955 and culminating with her commissioned work Houseparty, which aired in 1964. A historical and organizational framework is discussed regarding the BBC's cultural mission and view of arts programming, as well as general developmental milestones in programming contextualizing Dale's working conditions. Particular focus is placed upon the appropriation of Romantic narrative ballets and their significance in reinforcing an aristocratic and culturally divisive structure in the arts. Textual analyses consider issues of restaging, camera placement, and lighting, as well as television's intimacy and relationship to characterization in ballet narratives.
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Maria Edgeworth as a Precursor of Realism

Maria Edgeworth as a Precursor of Realism

Date: August 1958
Creator: Farr, Carie Jane
Description: The purpose of this thesis is to study the novels of Maria Edgeworth in an attempt to discover whether or not her novels have merit beyond their representation of the manners and morals of her historical period. This involves first an examination of her novels in the light of such criticism as has given rise to the question of their importance.
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Mariama Bâ: un féminisme né à l'intersection de deux cultures.

Mariama Bâ: un féminisme né à l'intersection de deux cultures.

Date: August 2006
Creator: Perret, Arnaud
Description: Many critics consider Mariama Bâ as a feminist writer, but the reader of her two novels might wonder what characterizes her work as such. Therefore, the aim of each chapter, in order of appearance, is to analyze first the genres, then the elements of African tradition and Western modernity, the characters of both works and the themes of the novels, with the intention of defining the author's feminism, which takes its source in dichotomies, paradoxes and contradictions. In order to expose the author's point of view on the condition of women, it appears important to situate the diegesis in its context. Also, the study is supported by references on the Senegalese culture, by genres, narrative and feminist theories and by critiques on the work itself.
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Mariano Azuela, Novelist of the Mexican Revolution

Mariano Azuela, Novelist of the Mexican Revolution

Date: 1946
Creator: Erickson, Marcia
Description: This thesis discusses the life and works of the Mexican novelist Mariano Azuela, who lived and wrote during the time of the Mexican Revolution.
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Marine Defense Battalions, October 1939 - December 1942: their Contributions in the Early Phases of World War II

Marine Defense Battalions, October 1939 - December 1942: their Contributions in the Early Phases of World War II

Date: December 1996
Creator: Maynard, Stephen Ronald
Description: This thesis explores the activities of the U.S. Marine defense battalions from October 1939 to December 1942. More specifically, it explains why Headquarters Marine Corps (HQMC) decided to continue the defense battalions as separate entities when, by mid-1943, it needed additional men to replace its combat losses and to create new divisions. In this process HQMC disbanded other special units, such as the raider battalions, parachute battalions, barrage balloon squadrons, and the glider squadrons. It retained, however, the defense battalions because of their versatility and utility as demonstrated during the various operations they conducted in Iceland and the Central and South Pacific. In these locations defense battalions performed as: (a) island garrisons, (b) antiaircraft artillery units, and (c) landing forces. Their success in carrying out these missions led to their retention as separate entities throughout World War II.
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