Now showing items 1087-1106 of 14781

    • Babocomari Indian village located on the Babocomari River; an archaeological site in southeastern Arizona.

      Di Peso, Charles C. (Charles Corradino); Getty, Harry T. (The University of Arizona., 1950)
    • Bach editions; a comparative study

      Cole, Walton Smith, 1921- (The University of Arizona., 1950)
    • Background characteristics of four Latin American armed forces and modernization

      Mengel, Russel William, 1941- (The University of Arizona., 1971)
    • The background of a student union food service director

      Dudczak, Michael Stanley, 1936- (The University of Arizona., 1968)
    • Background of Lizardi's El Periquillo Sarniento

      Christianson, Carl Trygve, 1906- (The University of Arizona., 1941)
    • Background to violence: Colombia 1930-1948

      Derryberry, Donald Ray, 1948- (The University of Arizona., 1972)
    • Backwash: expansion relationships in filter beds

      Ruggles, Gordon Charles, 1943- (The University of Arizona., 1968)
    • Bacteria-Based Molecular Assay Detection System (B-Mad)

      Hoying,Jay; Dion, Greg; (The University of Arizona., 2005)
      Bacteria possess natural mechanisms allowing them to adapt to the environment and communicate with each other, processing large amounts of information in parallel. Cyanobacteria survive in a variety of environments and respond to light. Vibrio harveyi, a marine bacteria, and Pseudomonas aureofaciens, a wheat bacteria, communicate using small molecules; V. harveyi bioluminesces in response to an inter-species signaling molecule, while P. aureofaciens produces phenazine in response to its intra-species signaling molecule. These inherent signaling mechanisms can be engineered to create rapid, specific, modular Bacteria-Based Molecular Assay Detection (B-MAD) systems. ABMAD system designed to detect the human pathogen Clostridium perfringens serves as proof of concept for completely biological information processing units. The B-MAD system consists of three engineered cyanobacteria cells used in combination to detect Clostridium perfringens, a causative agent in gas gangrene, food poisoning and antibioticassociated diarrhea. The B-MAD system is activated by blue/UV-A light and responds to AI-2, a small molecule produced by C. perfringens and perfringolysin 0, a C. perfringens pore-forming toxin. It is possible, using the yellow fluorescence and bioluminescence outputs from the B-MAD system, to unambiguously detect C. perfringens. The design of the B-MAD system as well as the fabrication of components for the Blue Light Converter are reported.
    • Bacterial attachment in porous media

      Logan, Bruce E.; Hilbert, Thomas Adams, 1961- (The University of Arizona., 1992)
      Colloid filtration theory was utilized to estimate the sticking coefficient (α) of bacteria in filter media. Determination of bacterial cell numbers was facilitated by incorporation of [³H] leucine into cells prior to filtration. Large changes in retention of bacteria within porous material correlated with different stages in the bacterial growth cycle. This was due primarily to changes in cell size and not due to a change in α. The effects of ionic strength, pH, nutrient status, surfactant concentration and filter material on α were also evaluated. Various filtration models predicted similar trends in the magnitude of bacterial α with changes in experimental conditions. Experiments were performed with two gram negative and one gram positive bacterial species, Pseudomonas fluorescens, Pseudomonas JS6, and Bacillus pumilus. Small reductions in α were observed in cultures that were carbon-limited. Oxygen limitation produced no change in alpha. Bacterial α's were a function of ionic strength and filter material.

      Walder, Anne Marie. (The University of Arizona., 1982)
    • Bacterial decay in sewage treatment plant effluent

      Wills, Robert Gordon, 1937- (The University of Arizona., 1967)
    • A bacterial water quality investigation of Canyon Lake, Arizona.

      Horak, William Frank,1951-; Lehman, Gordon S. (The University of Arizona., 1974)
      A study was made on Canyon Lake to determine the source of fecal contamination and to learn how best to control the contributing sources. Of all the water samples taken from the Acacia swimming area, 5.5% exceeded the recommended standard of 200 fecal coliforms per 100 ml water. Bacterial levels determined for 24 sediment samples from the Acacia area were mostly in the thousands per 100 ml range. Fecal coliform-fecal streptococci ratios for both the water and sediment samples were predominately in the range where animal waste is the presumed source. A hypothesis is presented which implicates sediment-stored bacteria as the major immediate source of water pollution with human users and dogs as the ultimate sources. Bacterial survival data are presented showing how the fecal coliform-fecal streptococci ratio will shift with storage until, after one week, a ratio typical of human pollution will decrease to one indicative of contamination by animal wastes. Multiple regression analysis was employed to define the relationships between bacterial levels and site conditions and area use. User load index (car count) and/or turbidity were significantly correlated with fecal coliform count in most of the various regressions. This correlation over all data was about 50 percent.
    • Bacterially catalyzed reductive dissolution of manganese for the liberation of silver from refractory ore

      Arnold, Robert G.; Upp Oden, Karen Lee, 1959- (The University of Arizona., 1991)
      This research focuses on the development of a biological treatment process to enhance silver recovery from a low grade, silver-bearing manganese ore. These manganese oxide ores have been classified as refractory and thereby characterized noncommercial for the recovery and production of silver by conventional methods. A species of Bacillus polymyxa, which was isolated from the Crystal Hill Mine in southern Colorado, facilitated the reductive dissolution of manganese dioxide. Insoluble Mn(IV) was reduced to soluble Mn(II), and silver ions contained within the manganese oxide lattice were released and/or exposed, making them amenable to cyanide extraction. A direct relationship was observed between the biological transformation of Mn(IV) to a lower valence and increased silver recovery following cyanidation. Batch studies, with ore passing minus 10 mesh (0.14 inch diameter), had silver recoveries that were twice the amount extracted by chemical treatment alone over a 120-hour period. However, rates of reductive dissolution diminished significantly as ore particle size increased and specific surface area decreased.
    • Bacteriological groundwater quality characteristics on the Walnut Gulch Experimental Watershed

      Hanks, K. S.; Thames, John L. (The University of Arizona., 1978)
      Groundwater aquifers are generally considered to be free from surface water pollution sources. Aquifer recharge mechanisms in arid lands appear to differ radically from those in more temperate climates. The groundwater beneath the Walnut Gulch Experimental Watershed located in southeastern Arizona is bacteriologically contaminated from three predominate sources: 1) the natural background contamination occurring from normal runoff-erosion syndromes; 2) rangeland grazing pressure which increases the pollution entering groundwater via runoff events, and; 3) the practice in Tombstone, Arizona of disposing of raw sewage effluent into abandoned mine shafts which subsequently penetrates the groundwater table. It is apparent that arid lands permit vast volumes of water to infiltrate drainage channels as a form of transmission loss. The results of this study clearly indicate that surface runoff water is penetrating local well fields. It should be obvious that best management practices where they involve arid land agriculture must be more thoroughly understood. If the amounts of pollutants are controlled with more efficiency, then the amounts of pollutants entering groundwater will be lessened. Land management practices in the southwest such as using desert soils for solid wastes disposal, injection wells, sewage effluent dumping, or other such activities must be thoroughly evaluated before they are blindly implemented as panacea solutions.
    • Ballade, for symphony orchestra

      Prindl, Frank Joseph (The University of Arizona., 1939)
    • The Balmer decrement in the emission spectra of astronomical objects

      Bloom, Gary Stuart, 1940- (The University of Arizona., 1969)
    • Balzac's treatment of local color in Les contes drolatiques

      Condron, Bobbie West, 1914- (The University of Arizona., 1940)
    • Band transcription of Symphony #1 (fourth movement)

      Sibelius, Jean, 1865-1957 (The University of Arizona., 1941)