Now showing items 9117-9136 of 14719

    • N2O emissions from wheat agro-ecosystems under elevated atmospheric CO2

      Weber, Marie Aimee.; Matthias, A.; Leavitt, Steven W.; Riley, James J. (The University of Arizona., 1997)
      Fertilizer-derived nitrous oxide, N20, may cause an increase of tropospheric N20, which could contribute to the destruction of the ozone layer and enhance the "greenhouse effect". The impact of fertilizer on tropospheric N20 may be enhanced by increased carbon dioxide, CO2, which may alter soil N dynamics. The goal of this research was to measure N20 emissions from soil within a field of wheat grown under two levels of atmospheric CO2 (ambient and ambient plus 200 ppm), two irrigation levels (15 and 30% depletion of available water in the root zone), and two levels N-fertilizer (15 and 350 kg N/ha). Spring wheat (Triticum aestivum L. cv. Yecora Rojo) was planted at the University of Arizona Agricultural Center, Maricopa, Arizona, December 1996 and harvested May 1997 in conjunction with a Free Air CO2 Enrichment (FACE) experiment. Chamber measurements of N20 emissions were made five days during the season. The results showed that emissions were not different for the two different irrigation levels. There was, however, a positive correlation between emissions and air temperature. The elevated CO2 had no statistically significant effect on the N20 emissions.
    • A Nahuatl method of compound word structure: Addition and multiplier junctures

      Zepeda, Ofelia; Amador, Tomas Gonzales Xocotl (The University of Arizona., 2001)
      This work intends to analyze Nahuatl mathematical structures and a minimal relationship to text, speech and literal ideographic writing. In section I there will be a historical background of language concepts in compound nouns and verbs. In section II questions will be listed concerning multiplier junctures, and section III the methods that will be used to obtain data and create a list of literal roots and stems of ideographic-image compound elements. Section IV will list the ideographic categories of the roots and stems of compound words. Section V through XII is the body of this work, compound number structures, singular and dual compound expressions with compound word trees, translation applications and cross reference matching. Mathematical structures and graphic representations of compound words will include literal morphological glosses. Translation applications will show the results of the juncture root or stem method of analysis. Multiplier structure with plurals will be addressed.
    • Nanoparticles Of PLGA With Encapsulated Insulin For Oral Controlled Release For Diabetes Treatment

      Guzman, Roberto; Abduljawad, Marwan; Guzman, Roberto; Gervasio, Dominic; Sorooshian, Armin (The University of Arizona., 2015)
      Insulin, a relatively low molecular weight protein has been used for decades in the treatment of diabetes; it has well-defined properties and delivery requirements. Due to the current increase of diabetes in the world improved insulin delivery systems could significantly influence the treatment of diabetes and the quality of life of the affected people. The main objective of this work was to encapsulate insulin in polymer nanoparticles of Poly (DL-Lactic-Co-Glycolic Acid) (PLGA) and poly vinyl alcohol (PVA). Preliminary results of these functional therapeutic nanoparticles prepared with PVA and PLGA by using a double emulsion method (water/oil/water) were obtained in terms of encapsulation efficiency and effective insulin release from the nanoparticles. Assessing the bioactivity of insulin once encapsulated and released is not trivial, thus an indirect protein assay was developed to effectively and easily assess the activity of proteins going through these processes. Trypsin, a proteolitic enzyme was used as model protein to investigate the biological activity of encapsulated and released biomolecules. The activity of trypsin towards a synthetic substrate, DL-BAPNA was used to measure the enzyme kinetics and activity before encapsulation, while encapsulated and after the enzyme was released from the nanoparticles. Results show that the enzyme maintained substantial activity while encapsulated and after its release. It is anticipated that the biological activity after being released from the nanoparticles will remain biologically active, however, biological assays remain to be performed to corroborate this argument. In addition to release experiments with trypsin and insulin, other proteins were also studied. In all cases the release form the nanoparticles at 37 °C exhibited a three stage release process, The release process will be modeled according to developed mathematical models that consider initial burst of molecules, degradation of polymer and diffusion of molecules from the nanoparticles.
    • Narrative for orchestra

      Williams, Leland Page, 1942- (The University of Arizona., 1966)
    • Nasal air flow during normal speech production

      Thompson, Amy Elizabeth (The University of Arizona., 1978)
    • Nation and church: a synthesis in the fight of the Romanian Bishop Inocențiu Micu

      McCormick, Timothy Thomas, 1948- (The University of Arizona., 1977)
    • The National Front Government in Colombia: success or failure?

      Grossarth, Galen William, 1937- (The University of Arizona., 1970)
    • National recreation areas: Landscape planning for outdoor recreation

      Zube, Ervin H.; Dorrance, Richard Adams, 1951- (The University of Arizona., 1992)
      This thesis is an examination of National Recreation Areas managed by the National Park Service, the Forest Service, and the Bureau of Land Management. It is exploratory in nature and seeks to illustrate their history, how well they are working today, and prospects for the decade of the 1990's. Included is information about the history, benefits, and trends of federal provision of outdoor recreation opportunities. Also included is a section on planning theory and conceptual frameworks--the concept of Multiple-Use, and the theory of Transactive Planning, as developed by John Friedmann. Managers of thirty-six of thirty-seven existing national recreation areas were interviewed by telephone concerning area attributes, the designation process, public support, enabling legislation, impacts of designation, and management mechanisms. A second research effort consisted of the creation of a computer database that serves as an index to the enabling legislation of all thirty-seven areas.
    • National sovereignty and the legal status of outer space

      Vosburgh, John A., 1933- (The University of Arizona., 1969)
    • National survey of hospital drug-use evaluation programs

      Draugalis, Jolaine R.; Terry, Allan Keith, 1952- (The University of Arizona., 1992)
      A self-administered, mail questionnaire was used to assess the current state of hospital drug-use evaluation (DUE) programs within short-term, general U.S. hospitals. During February-March 1992, two mailings were sent to pharmacy directors at 491 randomly selected institutions. A net response rate of 66.6% (327/491) was achieved. The level of pharmacist participation in DUE program activities was found to be very high and to have a significant, positive correlation with the rated effectiveness of current DUE programs and the rated importance of pharmacist participation in DUE program activities. Pharmacists were members on 97.9% of responders' DUE (sub)committees, while 65.5% of pharmacist members held voting privileges. Pharmacists devoted an average of 11.27 hours per week to DUE-related tasks. Wide variation was demonstrated in rationale used to select DUE study drugs, interventions employed, use of DUE study results, and methods selected to evaluate DUE program effectiveness.
    • The national survey of hospital pharmaceutical services in the Republic of China

      Larson, Lon N.; Lu, Jyh-Cherng, 1959- (The University of Arizona., 1990)
      A study of hospital pharmacy practice in the Republic of China was conducted in the Summer of 1987. The status of selected innovative pharmaceutical services and the attitudes of pharmacy directors toward developing and implementing those services were assessed. The innovative services were unit dose drug distribution, pharmacy-prepared i.v. admixtures, pharmacy computerization, drug information and clinical pharmacy services. A questionnaire was used to obtain data and information from a random sample of hospitals in Taiwan, R.O.C.. Most of selected services were performed in about 25% of the surveyed hospitals. The i.v. admixture program was performed by the lowest percent of general hospitals as compared to the other services in this study. Pharmacy directors indicated that their attitudes toward selected innovative pharmaceutical services in terms of seven possible effects or outcomes were positive, but the scores relating to the other professionals and operating expenses were neutral or negative.
    • Native American art and visual culture education through skateboards

      Garber, Elizabeth; Shin, Ryan; Badoni, Georgina; Garber, Elizabeth; Shin, Ryan (The University of Arizona., 2009)
      In this thesis, contemporary Native American images on skateboards that extend Native American art beyond such traditional crafts as beadworks and pottery are explored. The study reveals that Native American skateboard graphics express history, culture, and myths. Native American curriculum, Native American art, and Native American stereotyping in visual culture are critically examined. The purpose of the study is to provide additional Native American art and visual culture examples and methods for the development of Native American art curricula.
    • Native American women in children's literature

      Tippeconnic Fox, Mary Jo; Hay, Jody L. (The University of Arizona., 2002)
      This thesis focuses on the roles of Native women in children's literature. The study explores the works of five Native women writers in the United States that have successfully published adult literature and at least one children's book since 1990. The purpose of the research is to gain a better understanding of what these writers reveal about the roles of Native women in their literature for children. The data was collected using content analysis on the books and a questionnaire to determine (1) what roles the Native writers convey in their children's literature; and (2) what these women are writing in this field and their perspectives on the writing process. The findings of this research discuss these writers' portrayals of the complexity of Native women's roles as well as offer insight into their craft.
    • Native Americans in social studies curriculum: An Alabama case study

      Lomawaima, K. Tsianina; Barragan, Denise Eileen (The University of Arizona., 2000)
      This study describes how some members of the Cherokee Tribe of Northeast Alabama, a state recognized community, reacts to the ways in which Native peoples are represented in the social studies curriculum of DeKalb County, Alabama. Tribal members, ages 30--80 were interviewed about their educational experiences, as well as about their perspectives on the current curriculum. Social studies curricula of this school district, as well as elsewhere in the Alabama public school system, portrays Native peoples in a negative manner, and through the interviews and an extensive analysis of the curriculum, specific examples of these negative portrayals are pinpointed. This study specifically looks at the content, language and illustrations of seven state adopted textbooks, resulting in some specific recommendations on how teachers, as well as administrators, could improve the curriculum.
    • NATIVE CHANNELS: SOME AMERICAN INDIAN COMMUNICATIONS STRATEGIES

      Wheelock, Richard Martin (The University of Arizona., 1984)
    • Native movements: the American Indians respond to European contact

      Rich, Stephen Thomas, 1945- (The University of Arizona., 1969)
    • Nativistic religious movements among Indians of the United States

      Daugherty, Mary Ann Parke, 1940- (The University of Arizona., 1964)