Now showing items 11740-11759 of 14830

    • The Role of the Medial Temporal Lobes in Older Adults' Associative Deficit: A Behavioral Study

      Glisky, Elizabeth; Bisbee, Molly; Ryan, Lee; Nadel, Lee (The University of Arizona., 2012)
      It is well established that older adults show a deficit in episodic memory. The associative deficit hypothesis (ADH) (Naveh-Benjamin, 2000) suggests that an age-related reduced ability to create links between units of information is a major contributor to the episodic deficit. It has been a robust finding that older adults show a disproportionate decline in associative memory relative to item memory when compared to young adults. Previous researchers have investigated the role of the frontal lobes (FL) by studying the effect of reduced attentional resources in the associative deficit. However, they have not found that divided attention in young adults produces the disproportionate associative decline seen in aging and it is thought that some cognitive process other than the allocation of attentional resources may contribute to the associative deficit. The present study intended to use a divided attention (DA) task that also engages medial temporal brain regions (MTL) in order to tax additional parts of the network involved in creating associations and provide indirect support for the role of the MTL in the associative deficit. However, the associative memory deficit in older adults was not replicated due to unique poor associative memory performance of some young adults in the study. Analyses excluding these participants show support for the role of the MTL in the associative deficit. However, the young poor performers may provide support for the role of FL function in the associative deficit and show that poor associative memory may not be limited to the older adult cohort.
    • The role of the recall of judges issue in the struggle for Arizona statehood

      La Cagnina, Yolanda, 1928- (The University of Arizona., 1951)
    • The Role Of The Small GTPASE RAB14 In Apical ProteinTraffic And Maintenance Of Cell Polarity

      Wilson, Jean M.; Jacobson, Noelle C; Wilson, Jean M. (The University of Arizona., 2005)
      The establishment and maintenance of cell polarity during development is an active process that requires specific protein sorting and targeting to apical and basolateral regions of the cell. Our lab has identified an apical early endosomal marker, endotubin, in developing rat intestine, which we have used to label specialized apical endosomal tubules, and to probe for components of the apical sorting machinery. Studies with endotubin have implicated the small GTPase Rab14 as part of the sorting machinery for apical targeting. The current work pursues further study of the interaction between Rab14 and endotubin, as well as the role for Rab14 in the establishment of cell asymmetry. Interestingly, even nonpolarized cells may utilize polarized trafficking components for proper sorting and dynamics of endotubin.
    • The role of the social worker at the Arizona State Hospital

      Rosenberg, Adeline, 1913- (The University of Arizona., 1942)
    • The role of the United States in the development of the Republic of Liberia

      Freeman, Robert Michael, 1943- (The University of Arizona., 1968)
    • The Role of the Ventral Tegmental Area in the Extinction of Probabilistic Rewards

      Song, Minryung; Fallous, Jean-Marc (The University of Arizona., 2011)
      Because most of the events in the world are probabilistic and changing, the extinction of probabilistic events that no longer occur is important for survival. Here, we investigated the effect of reward probability on the rate of extinction using behavioral and pharmacological experiments in rats and temporal difference model simulations. Our experimental results suggested that ambiguity during extinction and the value of probabilistic reward are the two major causes that resulted in the inverted U-shaped relationship between the rate of extinction and reward probability. Using pharmacological activation and inactivation of midbrain dopamine neurons, we reasoned that ambiguity may not be signaled by dopamine neurons. By adding an ambiguity signal into an existing temporal difference model, we reproduced the inverted U-shape for the first time and supported our conclusion. Our study provides insights into the extinction of probabilistic rewards and gives a useful computational model for further investigation.
    • The role of U Thant, the United Nations Secretary General, in the 1967 Arab-Israeli crisis

      Boerlage, Peter Joseph, 1908- (The University of Arizona., 1969)
    • The Role of Water Speedwell in the Distribution and Rates of Metal Removal from Pinal Creek, Near Globe, Arizona

      Conklin, Martha H.; Robbins, Elizabeth; Conklin, Martha H.; Harvey, Judson W. (The University of Arizona., 2003)
      Aquatic plants can be significant sinks for dissolved metals in metal contaminated streams. This study found water speedwell (Veronica anagallis aquatica) growing in Pinal Creek both bio-accumulates metals (Mn, Zn, Ni, and Co) and provides surfaces for metal precipitation. Analysis of plant tissue found that roots accumulate up to 80 g Mn/kg dry root, with the majority of metals associated with the external plant surface. Fine sediments around water speedwell colonies have 2-10 times higher metal concentrations than surrounding sediments. SEM photos of the plant surface show clumps of manganese oxides associated with what appear to be manganese-oxidizing bacteria. First order metal removal rates by water speedwell of 1 x 10^-3, 2 x 10^-3, and 5 x 10^-3 per hour for manganese, nickel, and cobalt, respectively were estimated by laboratory experiments. Water speedwell enhances metal removal in streams by providing surfaces conducive for metal oxyhydroxides precipitation.
    • The Role of Women in The Merchant of Venice: Wives and Daughters Ahead of Their Time

      Dickey, Jerry; Bazzell, Jennifer Diane; Dickey, Jerry; Cole, Carrie; Helinsky, Heather (The University of Arizona., 2008)
      This thesis explores the role of the female characters in Williams Shakespeare's play The Merchant of Venice. Through contextualizing the characters of Portia, Nerissa and Jessica within the world of early modern England, this study explores the ways in which these characters do not conform to traditional Renaissance values regarding the role of women as daughters and wives. By using historical documents such as behavioral manuals, sermons, and "defenses" of women from the late sixteenth and seventeenth century, this thesis explores the ways in which Shakespeare's female characters challenge traditional social norms. Through the comparison of the female characters with Queen Elizabeth and Patient Griselda, this study discusses the implications of the rebellious behavior of the women in The Merchant of Venice. This thesis concludes that Shakespeare purposely challenges strict social views put forward on women by creating female characters who challenge male authority and are celebrated for their behavior.
    • Role Perceptions of Guardians Ad Litem and Children's Attorneys in Dependency Cases

      Beck, Connie; Duchschere, Jennifer Elizabeth; Beck, Connie; Becker, Judith B.; Bowen, Anne (The University of Arizona., 2016)
      The State of Arizona remains one of the few states where the number of children entering care is increasing rather than remaining stable or decreasing (U.S. Department of Health and Human Services, 2015). Although there is no research delineating the reasons for this trend, there are a multitude of challenges within Arizona’s child welfare system. This study examines one of the challenges within this system: the specific roles of two different legal representatives for children in dependency cases. The study aimed to discover how guardians ad litem (GAL) and children’s attorneys (CA) in Arizona perceive and execute their roles, as well as to better understand their needs. Qualitative, semi-structured interviews were conducted with five GALs, four CAs, and one attorney who identified as both. Results indicated both types of attorneys perceived their roles to be distinct statutorily, subjective, and an opportunity to provide their child clients with assistance in a variety of ways. Attorneys described execution of their roles through descriptions of general legal duties, communication with child clients, and interactions with other professionals. Lastly, attorneys detailed four challenges to successful execution of their roles including: coping with their own mental health, overwhelmed courts, limited training, and a lack of community resources. This study was limited by a homogeneous sample, in regard to both race (all Caucasian), as well as location which limits generalizability. Further, only one researcher conducted analyses. Future research should seek to better understand others' perspectives regarding child welfare cases, such as judges, parents' attorneys, Department of Child Safety (DCS) caseworkers, or the child clients. Research could also be helpful in creating specific guidelines in determining the "best interests" of a child, or developing materials and trainings that would assist attorneys in their current roles.
    • Role transition into fatherhood

      Warren, Leslie Feezer (The University of Arizona., 1979)
    • Role transitions of single-parent fathers

      Smith, Craig Wyatt, 1952- (The University of Arizona., 1977)
    • Roles of transfer factor in allograft transplantation in guinea pigs

      Murray, Henry Edward, 1946- (The University of Arizona., 1976)
    • Roman intervention in the Punic west: a study of its probable causes

      Fort, Thomas Allen (The University of Arizona., 1978)
    • Roman Pederastic Poetry: The Problem of the Puer Delicatus

      Skinner, Marilyn B.; Harvey, Elizabeth Gabrielle; Skinner, Marilyn B.; Waddell, Philip T.; Groves, Robert (The University of Arizona., 2017)
      This thesis examines the poetry of Catulus, Catullus, Horace, Tibullus, and Statius in an attempt to trace the development of a Roman pederastic poetics. This project aims to demonstrate how the status of the puer delicatus constitutes a point of contention for the Roman poets as they attempt to craft an elevated literature for the homoerotic amor between Roman citizen and subaltern. To legitimize an otherwise commonplace and inherently unequal configuration between citizen and slave, the poets participate in a project of assimilation that refigures the subaltern puer as a citizen youth and, in the poetry of Statius, even re-imagines the puer as a quasi-citizen within the aristocratic Roman family. To conclude, this study urges scholars to reevaluate Roman pederastic poetry as a cultural elaboration that attests to the problem that the stigma of the beloved's status posed to a standard homosexual configuration at Rome.