Now showing items 6103-6122 of 14721


      Chaille, John Sheridan. (The University of Arizona., 1983)

      Oksasoglu, Ali, 1960- (The University of Arizona., 1987)
    • Gain-bandwidth effects on the resonator filter

      Huelsman, Lawrence P.; Merrill, Douglas Richard, 1962- (The University of Arizona., 1992)
      The purpose of this study is to analyze the resonator filter, and to determine the effects of gain-bandwidth on the dominant complex conjugate pole pair. Optimization methods are then used as a design tool to determine the compensation required to shift the dominant pole pair back to their original design locations. New design values resulting from the compensation are used for the final circuit. Simulations are run to verify that the new design produces the desired magnitude response. The roots of the characteristic equation are checked to verify the proper location of the dominant pole pair. A comparison is made between the third order approximation and the fifth order one.
    • Galsworthy and the theme of the unhappy marriage

      Bingham, Fern Catherine, 1913- (The University of Arizona., 1937)
    • Galsworthy's "Spire of Meaning"

      Becker, Barbara E., 1911- (The University of Arizona., 1933)
    • The galvanic skin response as an indicator of selective attention

      Shean, Glen (The University of Arizona., 1964)
    • The game "Planet"

      Meehan, Matthias Patrick, 1942- (The University of Arizona., 1973)
    • The gamma member of the Kaibab Formation (Permian) in northern Arizona

      Lipinski, Paul William, 1951- (The University of Arizona., 1976)
    • Gamma ray dosimetry using Compton scattered electrons

      Myers, Dennis Michael, 1944- (The University of Arizona., 1970)
    • GAPs in Plant Reproduction: Uncovering the Role of Glycosylphosphatidylinositol-Anchoring of Proteins in Arabidopsis Gametophyte Function

      Palanivelu, Ravishankar; Desnoyer, Nicholas James; Yadegari, Ramin; Beilstein, Mark (The University of Arizona., 2019)
      Glycosylphoshpatidylinositol (GPI) is a complex glycolipid molecule biosynthesized in eukaryotic cells that can be post-translationally attached to a broad range of proteins by the transamidase complex (GPI-T) to serve as a membrane anchor. Apart from tethering GPI-anchored proteins (GAPs) to the extracellular leaflet of plasma membranes, GPI confers many molecular attributes to the proteins it attaches to. While the synthesis and structure of GPI is well conserved within eukaryotes, the utility of GPI-anchoring as a mode of protein membrane attachment shows striking variation among the eukaryotic kingdoms. For example, in protozoan parasites, GAPs are the major form of cell surface proteins and can shield the cell from host defenses during infection. Fungi such as yeast produce GPI anchors that can covalently link to polysaccharides in the cell wall to regulate its architecture. Animal GAPs are essential for coordinated growth during embryonic development and can act as signaling molecules to mediate cell-cell communication. In land plants, GAPs play roles in the directional growth and expansion of sporophytic tissues and are critical for the fertility of the gametophyte generation. Despite GAPs constituting about 1% of the Arabidopsis thaliana genome, it is poorly understood how this family of proteins function in plant development. Therefore, in this thesis, I investigated the role of GPI in plant reproduction by reviewing all 19 A. thaliana GAPs described to date with mutant fertility defects and annotated the expression of all 250 predicted GAPs in the A. thaliana gametophytes. Additionally, I analyzed mutations in two components of the GPI-T complex to investigate the importance of GPI-anchoring in male and female gametophyte functions. I showed that GPI-anchoring in the female gametophyte is apparently dispensable but is essential in the male gametophyte for pollen tube germination and growth. Based on my work, I propose that key differences in the structure and development of the male and female gametophytes may account for the difference in necessity of GPI-anchoring within their compartments. Thus, any conclusion regarding the importance of GPI-anchoring of proteins in the female gametophyte must consider these unique attributes. Lastly, because at least two GAPs involved in the female gametophyte function associate with receptor-like kinases (RLKs) to initiate signal transduction, we established several tools that can be used to elucidate the binding site of a well-studied GAP-RLK pair, the LORELEI-FERONIA co-receptor complex. The conclusions and tools generated in this study will help close the gaps in our understanding of the role of GAPs in plant reproduction.
    • Garnering public acceptance of restoration options in midwestern ecosystems via education dissemination.

      Daniel, Terry; Hill, Dawn Marie (The University of Arizona., 2004)
      This study investigated the effects of ecological information/education on perceptual evaluations of a sample of woodland sites in Midwestern USA. A computer-administered perceptual survey presented digital video images of 45 sites, ranging from relatively open savannah to dense woodland, to separate groups of college students who provided ratings of either perceived scenic beauty or acceptability (of environmental policy outcomes). Subjects in the education condition were first presented with a brief verbal and pictorial message emphasizing the history and the biological/ecological benefits of either savannah ecosystems (emphasizing the importance of "openness and open areas") or woodland ecosystems (emphasizing the importance of "protective cover and maintaining tree density"). Subjects in the non-education conditions received only general information about environmental and ecological management on public lands in the Midwest. Subjects in all conditions exhibited strong and internally consistent aesthetic and policy preferences across the 45 sites presented. There were consistently strong positive correlations between scenic beauty and policy acceptance ratings. In spite of the education manipulations intended to foster differential preferences for more open sites (savannah education) versus more dense sites (woodland education) correlations were uniformly strong and positive between savannah and woodland instructed groups, as well as between education and non-education groups for both scenic beauty and policy acceptability ratings. (Abstract shortened by UMI.)

      Waterson, Charles Kent. (The University of Arizona., 1984)

      Khan, Mohammad Bilal. (The University of Arizona., 1984)
    • Gas Phase Structures and Molecular Constants Of a Hydrogen Bonded Dimer and an Inorganic Molecule Determined Using Microwave Spectroscopy

      Kukolich, Stephen; Mitchell, Erik Gordon; Aspinwall, Craig; Denton, Bonner; Kukolich, Stephen (The University of Arizona., 2012)
      Pulsed-beam Fourier transform microwave spectroscopy (PBFTMS) was used to determine the rotational structure of N-hydroxypyridine-2(1H)-thione. PBFTMS was also used to determine the rotational structure of a hydrogen dimer between propiolic acid and formic acid. Rotational constants and quadrupole coupling constants were determined. Calculations (MP2/DFT) were utilized in predicting the isotopic structures. Isotopic data (D, and ¹³C) and normal isotopomers collected were used in establishing of key structural parameters such as bond length and bond angles.
    • Gas-solids mixing in incipiently fluizized beds of nonuniform cross-sectional area

      Miller, Kalman Joseph, 1940- (The University of Arizona., 1963)
    • Gaseous transport in the vadose zone : computer simulations using the discrete state compartment model

      Seidemann, Rick Hugh,1960-; Simpson, Eugene S.; Evans, Daniel D.; Bently, Harold (The University of Arizona., 1988)
      Past disposal practices of TricNoroethylene (ICE) and other halogenated hydrocarbons have resulted in the contamination of groundwater in part of the Tucson Basin, Tucson, Arizona. At the Carranza site, known to overlie a ICE groundwater contamination plume, a nest of gas sampling piezometers was constructed to measure the vertical distribution of TCE vapor in the vadose zone. The distribution of TCE vapor in the vadose zone was found to be nonmonotonically decreasing from the water table to the atmosphere. To investigate this ICE concentration profile, simulation studies were performed using the Discrete State Compartment model to test various hypotheses concerning the transport mechanisms of TCE vapor in the vadose zone. The studies showed that unless a high permeable column by which diffusing gas could by-pass low permeable layers was included in the simulation molecular diffusion alone could not produce the concentrations measured at the Carranza site. The simulation also showed that a nonmonotonic concentration profile similar to the measured concentration profile could be produced if multiple sources are assumed in the vadose zone. Soil gas advection by barometric pressure fluctuations was shown to increase concentrations at all depths in the vadose zone but the effect was minor compared with the effect of the high permeability column bypass for TCE diffusional transport.
    • Gastrointestinal toxicity of carrageenan in the newborn guinea pig

      Nyman, David William (The University of Arizona., 1981)