Now showing items 8123-8142 of 15247

    • Is the constitution of a greenway trail network associated with cycling commuter use?

      Stoltz, Ronald R.; Sager, Brian A. (The University of Arizona., 2002)
      This study of the physical composition of greenway trail networks focuses on how a trail system interacts with a city, and how the city's population interacts with the trail system. Previous studies have suggested that a trail system's use and length have a symbiotic relationship, while other studies propose that a trail is used in accordance with its location within the city. Most current transportation and ecological studies focus on linkage, and present connectivity as the best condition of a linear system. Sixteen case studies are presented and critiqued according to criteria developed in the paper. Statistical analysis is employed to analyze the numeric data, and recommendations are distilled from the statistical analysis and literature review. It is proposed that the physical nature of a greenway system does not effect the city's commuter cycling levels, and a city's cycling culture is the most influential factor in commuter cycling levels.
    • Is there competition between exotic and native cavity-nesting birds in the Sonoran Desert: An experiment

      Mannan, R. W.; Bibles, Brent Dean, 1965- (The University of Arizona., 1992)
      I examined the relationship between exotic and native cavity-nesting birds in the Sonoran desert near Tucson, Arizona during 1988 and 1989. I attempted to limit cavity availability in 1989 by plugging cavities that were unused, or used by exotics, in 1988 with rubber test tube stoppers. Numbers of nests of any species did not significantly change between 1988 and 1989. Control plots showed similar results. I found no significant negative correlations between number of nests of European starlings (Sturnus vulgaris) and any other cavity-nesting species. Of the cavity characteristics examined, species only differed in size of cavity openings. My data indicate that exotic and native cavity-nesting birds were not competing for nest cavities. An excess of available nest cavities is the probable reason for this lack of competition. Temporal differences in cavity use among species may have helped contribute to the abundance of cavities.
    • Isaria fumosorosea (Hypocreales: Clavicipitaceae) And Beauveria bassiana (Hypocreales: Cordycipitaceae) as Potential Biocontrol Agents for Blue Alfalfa Aphid Acyrthosiphon kondoi (Hemiptera: Aphididae) in Alfalfa Medicago sativa

      Stock, S P.; Mostafa, Ayman M.; Howes, Rebecca Louise; Hunter, Martha S. (The University of Arizona., 2021)
      Alfalfa (Medicago sativa L.) is a commonly grown crop in the low desert region of Arizona. One of the most damaging insect pests in this system is the blue alfalfa aphid, Acyrthosiphon kondoi (Hemiptera: Aphididae). Reports of aphids developing resistance to chemical pesticides and interest in conserving insect natural enemies, has renewed interest in developing biological control approaches for this pest. Recent observations of epizootic fungal infections in Arizona alfalfa aphid populations indicates entomopathogenic fungi could serve as biological control agents. Entomopathogenic fungi are a commonly used biological control for aphids. There are several species of entomopathogenic fungi currently commercially available for use as formulated insecticides. In this project I tested two commercially available mycopesticide formula, Isaria fumosorosea Apopka strain 97, PFR-97TM 20% WDG (Certis Biologicals, , Columbia, MD, USA) and Beauveria bassiana (Bals.), strain GHA, CX-10282 (Certis, USA) against a lab colony of A. kondoi. Direct and indirect application methods were used to determine the virulence of the tested fungi. Direct application of I. fumosorosea resulted in the highest observed mortality (47%) for the 1mg/mL dose, I. fumosorosea resulted in a lower mortality rate (33.2%) when applied with the indirect method. With respect to B. bassiana, the direct application of the highest tested dose (1mg/mL) yielded 33.6% aphid mortality, while the indirect application method resulted in a very low 18% mortality. These results provide guidance for the future consideration of the tested entomopathogenic fungi formulation in the control of blue alfalfa aphids.
    • "Ism-schism" worldview and the demise of nature: Ecofeminism as a viable alternative

      King, David A.; Liska, Joyce, 1955- (The University of Arizona., 1995)
      This paper suggests that environmental degradation is a symptom of a corrupt worldview. The dominant Western worldview construes the world as an aggregate of component parts having an antithetical, competitive relationship. This dualistic arrangement which divides and then negates the "other" conditions people to value aggression and power, and inevitably results in violence. Nature, in this hierarchical caste system is regarded as inferior, inert, or evil. Behavior and social institutions, such as the Christian religion, science and capitalist economy both reflect and reproduce these destructive values. Ecofeminism, by contrast, offers an alternative worldview more conducive to environmental prosperity. It regards the cosmos holistically, with all components having an equally valid, albeit distinctive, significance. This orientation emphasizes compassion and communion rather than fear and subjugation. Dissociating from the ego-based mindset of domination which underpins social and environmental decay allows the possibility of transforming consciousness and establishing an ecological worldview.
    • The Isolated Human Bone From Grasshopper Pueblo (AZ P:14:1[ASM])

      Margolis, Michael Martin; Pavao-Zuckerman, Barnet; Beck, Lane; Reid, J. Jefferson; Pavao-Zuckerman, Barnet (The University of Arizona., 2007)
      This paper presents research on isolated human remains from Grasshopper Pueblo and analyzes the processes by which bone becomes displaced from burials. Isolated human bone has never been systematically examined, which represents a significant gap in the study of the prehistoric American Southwest. This research is important because it is the first determination of the pattern of isolated bone found at an archaeological site and the formation processes that are responsible. It is also relevant for the creation of a standard isolated bone methodology and because it enables a better understanding of burial assemblages and anomalous assemblages of culturally modified bone.Subadults dominate the assemblage and larger elements are better represented than smaller elements. Most of the modifications present are postmortem but perimortem breakage and toolmarks are also present. This research produced a baseline of detailed data on isolated human bone in which patterns and anomalies can be inferred; the results suggest multiple causes of the isolation of the specimens, including prehistoric cultural disturbance, rodent disturbance, and the process of excavation.
    • The isolation and analyses of the hemicelluloses of the heart- wood of black-locust

      Redd, John Coleman, 1915- (The University of Arizona., 1938)
    • The isolation and analysis of hemicelluloses from rind of corn stalks, Zea mays.

      Scott, Donald Albert, 1917- (The University of Arizona., 1941)
    • The isolation and analysis of the hemicelluloses from white birch wood

      Westerbeke, Donald, 1916- (The University of Arizona., 1938)
    • The isolation and analysis of the hemicelluloses obtained from lemon wood

      Stewart, William Thomas, 1915- (The University of Arizona., 1938)
    • The isolation and analysis of the hemicelluloses of rice hulls, Oryza sativa, L.

      Pickering, John Edward, 1918- (The University of Arizona., 1941)
    • Isolation and characterization of a vacuolar Na⁺/H⁺ exchanger in Salicornia bigelovii Torr.

      Schumaker, Karen S.; Kshirsagar, Meenakshi K. (The University of Arizona., 2002)
      The work in this thesis provided critical information about the vacuolar Na⁺/H⁺ exchanger in Salicornia bigelovii with a goal to understand its role in plant salt tolerance. A cDNA (SbNHX1) was isolated and showed 87% identity to the Na⁺/H⁺ exchanger from the glycophyte, Arabidopsis thaliana. DNA blot analysis suggests the presence of a family of Na⁺/H⁺ exchangers in Salicornia bigelovii . An increase in SbNHX1 transcript was seen in shoots of 200 mM NaCl-grown plants compared to transcript levels in 5 mM NaCI-grown plants. To understand whether the SbNHX1 cDNA conferred increased salt tolerance by virtue of its unique sequence, the coding region of SbNHX1 was cloned for expression in Arabidopsis thaliana . Potential Ca⁺² regulation of vacuolar Na⁺/H⁺ exchange is shown using transport experiments. The isolation of a vacuolar Na+/H+ exchanger from Salicornia bigelovii and its functional expression in Arabidopsis thaliana will provide information on the salt tolerance mechanisms used by halophytes. (Abstract shortened by UMI.)
    • Isolation and characterization of high copy number suppressors of the SOS system in Escherichia coli

      Mount, David; Hunter, Rosalyn Alexandria, 1966- (The University of Arizona., 1993)
      In an attempt to find new genes that are involved in the induction of the SOS system of Escherichia coli, a plasmid library of Escherichia coli K-12 DNA cut with EcoRI was created in a pUC plasmid. The plasmids were transformed into the Escherichia coli strain AT492 containing a sulA::lacZ fusion. Colonies which did not show lacZ expression when the SOS systems had been induced by Mitomycin C were isolated. Four plasmids were found to suppress SOS induction when they were highly expressed. Kohara phage hybridization and restriction mapping suggest that these plasmids contain the genes for lexA and a truncated recA gene ending at the EcoRI site at basepair 1016.