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Recent Submissions

  • Survey Determining Involvement of Certified Athletic Trainers in Return to Activity/Play Decisions and Concussion Education

    Olla, Danielle; The University of Arizona College of Medicine - Phoenix; Hirsch MD, Handmaker
    In the some states a Certified Athletic Trainer (AT) has the ability to determine if a player can return to activity or play (RTP) following a mild Traumatic Brain Injury (mTBI), also known as a concussion. Premature return to activity or RTP and sustaining another concussion can result in further axonal damage, prolonged complications and rarely, death. There currently is no standardized education and certification for ATs regarding concussion management, and no data exists determining how often ATs are involved in return to activity or RTP decisions. The aim of this study was to survey ATs and establish a baseline of their involvement in return to activity and RTP decisions and determine what type and amount concussion education ATs are completing at the present time. A twenty (20) question electronic survey was sent to 2084 randomly selected ATs registered with the National Athletic Trainer Association (NATA). 382 responses were collected in a 38‐day period. The survey was successfully completed by a total of 356 ATs from across the United States.

    O'Connor, Devin; The University of Arizona College of Medicine - Phoenix; Brady MD, Michael
    Background This systematic review focuses on discussing the critical shortage of surgeons and access to surgical services in many low income African nations and the difficulties encountered by non-physician clinicians who are trained to increase the surgical workforce by carrying out less severe surgeries and peri-operative care. By critically assessing the literature this review seeks to present the benefits to surgical task shifting and the most commonly encountered problem with this type of healthcare intervention
  • An Unusual Complication of Gastrografin®: Gastric Precipitation

    Bergin, Edward; The University of Arizona College of Medicine - Phoenix; The University of Arizona College of Medicine - Phoenix.; vanSonnenberg MD, Eric
    Gastrografin®, an oral contrast agent, is important for non-operative management of small bowel obstruction and post-operative ileus. However, Gastrografin® can cause complications with its propensity to precipitate in an acidic environment. We describe a case of Gastrografin® precipitation in the stomach that resulted from delayed gastric emptying and increased gastric acid secretion in an elderly woman.
  • Predicting Postpartum Hemorrhage: A Retrospective Study

    Amaya, Stephanie; The University of Arizona College of Medicine - Phoenix; Gerkin MD, Richard; Mattox MD, John
  • Geographic correlation between nonmedical exemption rates in Arizona kindergarten classes and rates of community pertussis infection

    Sun, Sophie; The University of Arizona College of Medicine - Phoenix; Villarroel MD, Lisa (The University of Arizona., 2018-04-09)
    Background: Every state in the US mandates specific vaccinations for all children prior to school entry. However, many states, such as Arizona, are permit nonmedical exemptions (NMEs), and thus, communities with high levels of NMEs are potentially more vulnerable to outbreaks of vaccine preventable diseases. Objective: The objective of this study was to detect spatial clusters of pertussis cases and kindergarten NMEs of DTaP vaccine in Arizona. Methods: Data detailing kindergarten NMEs for each AZ school in the 2012-13 and 2013-14 school years and pertussis cases with report dates during those time periods were obtained from the Arizona Department of Health Services databases. Addresses for each school and pertussis case were geocoded, and the coordinates were obtained for each corresponding census tract. Using a purely spatial analysis with Poisson probability model, areas with high rates of pertussis or NMEs were identified with SaTScan. Clusters for both the number of NMEs and pertussis cases were detected and presented in maps. Extremely large (>50km radius) clusters extending beyond state boundaries were considered irrelevant and removed. Results: Multiple clusters of NMEs and pertussis cases were identified in two school years. While the clusters were generally in highly populated regions, they were not located at the same region in both years. The NME clusters and case clusters did not always overlap. Conclusions: The current analysis does not support an association between kindergarten NME frequency and pertussis outbreaks within these time periods. Clusters of both NMEs and pertussis cases were located in different regions each year. Since kindergarten NMEs vary from year to year, it is possible that these NME rates are not reflective of those in the community. Further studies with larger datasets will be important in elucidating the spatial distribution of pertussis cases and NMEs.
  • Epidemiology of Post-Traumatic Brain Injury-Induced Hypothalamic Pituitary Dysfunction in Arizona AHCCCS Patients

    Sukhina, Alona; The University of Arizona College of Medicine - Phoenix; Lifshitz PhD, Jonathan (The University of Arizona., 2018-04-09)
    Introduction: Traumatic brain injury (TBI) in children can result in cognitive, emotional and somatic neurological impairments. In adults, post-traumatic hypopituitarism can extend or exacerbate these impairments, likely due to mechanical damage to the pituitary and hypothalamus. The pituitary in the pediatric brain likely suffers similar mechanical damage, inducing endocrinopathies as in adults, but injury-induced endocrinopathies are infrequently reported in children. Unrecognized hypopituitarism may lead to elevated risks of metabolic syndrome, diabetes, delayed or absent puberty, short stature, and other endocrinopathies. However, screening for endocrine deficiencies in susceptible patients and initiating appropriate hormone replacement therapy may prevent these sequelae and improve the prospects for recovery. Results: We determined that TBI victims were 3.18-times higher risk of developing a central endocrinopathy compared with the general population (CI=0.264), pediatric AHCCCS patients with a central endocrinopathy had a 3.2-fold higher odds of a history with TBI than those without a central endocrinopathy (CI=0.266), of the central endocrinopathy in TBI victims is attributable to the TBI, and the number of patients who need to be exposed to a TBI for 1 patient to develop an endocrinopathy was 154.2 (CI=7.11). We also determined that more males than females presented with central endocrinopathies after TBI compared with the general population of TBI victims.
  • Musculoskeletal Biopsies: It Is Training, Not Site of Service, That Matters

    Stockwell, Erin; The University of Arizona College of Medicine - Phoenix; De Comas MD, Amalia (The University of Arizona., 2018-04-09)
    Background and Significance: Percutaneous needle biopsy has been found to be a safe and accurate method for initial investigation of soft tissue masses. The notion exists that needle biopsies should be performed in specialized sarcoma centers, which can place financial burden on patients without a sarcoma center near their place of residence. There is no consensus in the current literature regarding the diagnostic accuracy and clinical utility of clinic-based percutaneous core needle biopsy performed by community orthopedic surgeons with fellowship training in musculoskeletal oncology.
  • Novel Approach to Determine the Effect of Sub-Optimal Semen Analysis Parameters on Obtaining Euploid Blastocysts after Intracytoplasmic Sperm Injection

    Savage, Narry; The University of Arizona College of Medicine - Phoenix; Lipskind MD, Shane
    Preimplantation genetic screening (PGS) is a method of screening a blastocyst for chromosomal abnormalities during in vitro fertilization (IVF) by performing a karyotype on a single cell from the blastocyst. PGS was previously offered to couples with advanced maternal age, recurrent pregnancy loss, repeated implantation failure, or severe male factor infertility. Now PGS is common practice for all IVF cycles to improve outcomes by selecting chromosomally normal (euploid) embryos for transfer. This investigation aims to study the effect of male semen parameters on the likelihood of obtaining chromosomally normal embryos using ICSI. A unique approach was taken by comparing the outcomes between multiple “paired couples” who have utilized donor eggs obtained from the same donor in the same cycle. This model was adopted to minimize oocyte variation as a confounding variable. Using retrospective record review and data analysis, the relationship between optimal vs suboptimal sperm parameters and the resultant percentage of euploid embryos obtained after ICSI was evaluated.
  • The Emission Lines in the Vicinity of Hydrogen Alpha in dMe Flare Star Spectra

    Worden, S. P.; Peterson, B. M.; Univ Arizona, Steward Observ (Steward Observatory, The University of Arizona (Tucson, Arizona), 1976)
    High resolution spectral data obtained in the vicinity of hydrogen alpha have been obtained for a number of dMe stars. Centrally reversed Ha emission profiles appear to be a general feature of dMe spectra. Possible mechanisms related to solar phenomena are discussed for forming this type of profile.
  • Discrete States of Redshift and Galaxy Dynamics. III. Abnormal Galaxies and Stars

    Tifft, W. G.; Univ Arizona, Steward Observ (Steward Observatory, The University of Arizona (Tucson, Arizona), 1976)
    The redshift pattern in M82 is shown to be consistent with the multiple redshift concept as are redshift differentials in other active objects. The presence of multiple redshift states and the general lack, therefore, of violent motion appears consistent with all types of galaxies. Within our own Galaxy evidence is examined for effects of multiple redshift effects in stars. Four possibilities are considered; interstellar material, pre main sequence objects, rotation In massive stars, and highly evolved or peculiar stars. All classes show evidence of the predicted redshift periodicity. Stellar rotation in particular, is shown to occur preferentially in steps of 72.5 km s-1. Implications of the correlations are briefly discussed.
  • Discrete States of Redshift and Galaxy Dynamics. II. Systems of Galaxies

    Tifft, W. G.; Univ Arizona, Steward Observ (Steward Observatory, The University of Arizona (Tucson, Arizona), 1976)
    In the first paper in this series, a basic model was developed, for individual galaxies, consisting of two expanding opposed streams of material differing systematically in redshift. I.n this paper, galaxies in pairs and groups are shown to show no evidence of gravitational interaction. Redshift differentials between pairs of galaxies and between galaxies in clusters are found to take on preferred values which are various multiples of a basic 72.5 km s-1. There is also direct evidence that the redshift periodicity phases together between groups to imply that there is also no large scale motion between clusters of galaxies. The various mass discrepancies or peculiarities arising from a dynamical interpretation of differential redshifts are also shown to be of a form that no gravitational interaction and no significant motion requires.
  • Discrete States of Redshift and Galaxy Dynamics. I. Internal Motions in Single Galaxies

    Tifft, W. G.; Univ Arizona, Steward Observ (Steward Observatory, The University of Arizona (Tucson, Arizona), 1975)
  • Galaxies, The Redshift, and Gravity

    Tifft, W. G.; Univ Arizona, Steward Observ (Steward Observatory, The University of Arizona (Tucson, Arizona), 1974-04)
    When apparent velocities of galaxies in clusters, measured by the red - shift, are correlated against magnitude and morphology, strong non -dynamical correlations emerge. The details of the correlations are used to develop a logical theory for the existance of multiple substates of matter, presumably involving the substructure of fundamental particles. Transitions between substates in a time systematic sense are presumed to occur under the ultimate conditions existant in the cores of black holes in galaxy nuclei. Subsequent separation of states and the interrelations between galaxies require that different substates of matter be non -interactive gravitationally.
  • Are All Blue Stragglers Binaries?

    Hintzen, P. M. N. O.; Scott, J. S.; Whelan, J. A. J.; Univ Arizona, Steward Observ (Steward Observatory, The University of Arizona (Tucson, Arizona), 1974)
    Radial velocity studies for five bright blue stragglers are reported and cluster membership is confirmed for four of them. Two of the stars show no significant radial velocity variations on a timescale of about 75 days and two others show no significant variation on timescales of 15 and 30 days respectively. The star for which cluster membership is uncertain may be a velocity variable. The data do not support the theory of blue straggler production involving mass transfer in a close binary. A spread in formation time of the stars in a cluster is shown to be a plausible explanation of the blue stragglers studied.
  • G 240-72 -- A New Magnetic White Dwarf with Unusual Polarization

    Angel, J. R. P; Hintzen, P. M. N. O.; Strittmatter, P. A.; Martin, P. G.; Univ Arizona, Steward Observ (Steward Observatory, The University of Arizona (Tucson, Arizona), 1974)
    GD 240 72 ( =LP44 -113), a DC white dwarf, is found to show elliptical polarization. There is no evidence of variability. The circular component, typically 0.5 %,changes sign with wavelength, being negative in blue light a and positive in red. There is /relatively strong component of linear polarization, 1.4% in blue light.
  • The Effects of the 35 Day X-Ray Cycle on the Light Curve of HZ Herculis

    Grandi, S. A.; Hintzen, P. M. N. O.; Jensen, E. B.; Tydgren, A. E.; Scott, J. S.; Stickney, P. M.; Whelan, J. A. J.; Worden, S. P.; Univ Arizona, Steward Observ (Steward Observatory, The University of Arizona (Tucson, Arizona), 1974)
    We report extensive photoelectric UBV photometry of the variable star HZ Her, originally undertaken to discover possible correlations between variations in its 1.7 day light curve and the 35 day cycle of the X -ray source Her X -1. Correlations recently reported by other groups are confirmed. These, as well as other features observed, are provisionally analyzed using a model consisting of a primary star, filling its Roche lobe and being illuminated by X -rays. The X -rays are emitted in a beam fixed in a rotating, precessing, neutron star secondary. Additional light is being contributed by material being transferred from the primary to the secondary.
  • A Comparison of Variable and Non-Variable Stars in the Cepheid Strip

    Schmidt, E. G.; Rosendhal, J. D.; Jewsbury, C. P.; Univ Arizona, Steward Observ (Steward Observatory, The University of Arizona (Tucson, Arizona), 1974)
    Spectra of three Cepheids (RX Aur, X Cyg and T Mon) and 11 non -variable supergiants are analyzed. Additional evidence is presented for the presence of non -variables within the Cepheid strip. Temperatures determined from Ha line profiles and broad band photometry were used together with model atmospheres and line strengths from the spectra to determine the gravities, turbulent velocities and element abundances. The gravities of the Cepheids appear to be lower than for the non -variables at the same luminosity while the turbulent velocities are higher. No differences of significance are found in the element abundances. The gravity differences can be explained either in terms of mass loss in the Cepheids or very low helium abundance in the non -variables. The former interpretation fails to explain why some Cepheid strip stars do not vary while the latter raises problems in connection with the origin of the elements. If we assume that pulsation causes some mass loss a more consistent picture emerges in which only moderate helium deficiencies are required in the non-variables.
  • Fine Structure Within the Redshift-Magnitude Correlation for Galaxies : Proceedings of the 58th IAU Symposium (1973)

    Tifft, W. G.; Univ Arizona, Steward Observ (Steward Observatory, The University of Arizona (Tucson, Arizona), 1973-08-01)
    Previous work on the redshift- magnitude banding correlation is briefly reviewed. New tests of the concept are applied successfully to a second cluster (A2199) and the outer portions of the Coma cluster. Using more than 200 redshifts in Coma, Perseus, and A2199 the presence of a distinct band - related- periodicity in redshift is indicated. Finally, a new sample of accurate redshifts of bright Coma galaxies on a single band is presented, which shows a strong redshift periodicity of 220 km sec -1. An upper limit of 20 km sec -1 is placed on the internal Doppler component of motion in the Coma cluster. Redshift- magnitude bands are, therefore, now recognized to consist of discrete "spin states" organized into "spin groups" which show strong mor- phological associations. Bands are probably in turn organized into band systems. The individual spin states are suggested to represent distinct configurations of matter at the nuclear or fundamental particle structure level. Transitions between states in a time systematic sense of decreasing redshift (increasing internal binding) is suggested to occur in galaxy nuclei. Energy released in such transitions is suggested as the driving energy in radio sources and related objects.
  • The Color Structure and the Distribution of Neutral Hydrogen Within Messier 51

    Worden, S. P.; Univ Arizona, Steward Observ (Steward Observatory, The University of Arizona (Tucson, Arizona), 1973)
  • Diffraction Effects in Pulsating Radio Sources

    Hopf, F. A.; Cocke, W. J.; Lubart, N. D.; Univ Arizona, Steward Observ (Steward Observatory, The University of Arizona (Tucson, Arizona), 1975)
    A pulsar radio emission model is developed to explore the effects of diffraction on pulsar beaming. At very low frequencies (y < 10 MHz), we predict an increase of pulse width and the discovery of new pulsars. The pulse width increase would be very difficult to untangle from interstellar scintillation effects. Observation of these diffraction effects would place restrictions on the size and radius of curvature of the emission regions.

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