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  • Symbiotic and saprophytic characteristics of a soil population of Rhizobium leguminosarum bv. trifolii

    Creator:
    Yap, Kathryn H. M.
    Abstract:
    Although much has been learned about the comparative nodulating behavior of simple mixtures of rhizobial strains under non-soil situations, it is unclear how these findings relate to the factors influencing nodulation success by the complex mixtures of strains found within soil-borne rhizobial populations. Information on the structure and physiological behavior...
    Resource Type:
    Masters Thesis
    Full Text:
    the enzymes. Enzyme EC no. Substrate and coupling enzymes (amt) Assay buffer and salt supplements(amt

  • Characteristics of bradyrhizobium sp. recovered from Oregon soils

    Creator:
    Cheng, Hsin-hua
    Abstract:
    Although the biology of Bradyrhizobium has been studied for almost one hundred years, virtually nothing is known about the ecology and genetic variation in natural soil populations of this genus. The majority of information has been obtained from studies of one species, Bradyrhizobium japonicum, and the diversity within soil populations...
    Resource Type:
    Masters Thesis

  • Cooperation and conflict in Pseudomonas aeruginosa quorum sensing

    Creator:
    Wilder, Cara N.
    Abstract:
    Pseudomonas aeruginosa is an environmental bacterium as well as an opportunistic pathogen that primarily infects immunocompromised individuals, including those suffering from cystic fibrosis. The density-dependent regulation of gene expression via cell-to-cell communication, also termed quorum sensing (QS), is an important virulence determinant in this organism. Generally, P. aeruginosa uses three...
    Resource Type:
    Dissertation

  • Characterization of dairy leuconostocs and method to use Leuconostoc mesenteroides ssp. cremoris to improve milk fermentations

    Creator:
    Levata-Jovanovic, Marina
    Abstract:
    Dairy leuconostocs are frequently used as aroma-producing bacteria in mesophilic cultures used as starters for milk fermentations. Sixty Leuconostoc strains from different culture collections were studied taxonomically for species identification. Based on morphological, physiological and biochemical tests, twenty of these strains were typed as Leuconostoc mesenteroides ssp. cremoris (Leu. cremoris)....
    Resource Type:
    Masters Thesis
    Full Text:
    . Protein concentrations were determined by the method of Lowry et al. (1951). The activity of DR (EC

  • Analysis of chlamydial and host proteins associated with infection

    Creator:
    Chu, Hencelyn
    Abstract:
    Chlamydiae are obligate intracellular bacteria that infect a variety of eukaryotic hosts and affect normal host processes. Within host cells, their developmental cycle takes place inside non-acidified vacuoles termed inclusions. An inclusion membrane composed primarily of secreted chlamydial synthesized proteins called Incs encloses the inclusion. At this location, Incs have...
    Resource Type:
    Dissertation

  • Characterization of antibiotic resistant enteric bacteria that contaminate vegetables

    Creator:
    Salama, Maysoon
    Abstract:
    Previous studies revealed the high incidence of drug resistant bacteria from foods. In this study, market vegetables were tested for their contamination with antibiotic resistant (ABR) enteric bacteria. A total of 402 bacterial strains from surface vegetables (e.g., lettuce) and 321 from root vegetables (e.g., carrots) were examined for their...
    Resource Type:
    Masters Thesis
    Full Text:
    shellfish. Antimicrob. Agents Chemother. 9:879-884. 4. Cooke, M. D. 1976. Antibiotic resistance in coliform

  • Social Evolution and Regulatory Architecture of Pseudomonas aeruginosa Quorum Sensing

    Creator:
    Asfahl, Kyle L.
    Abstract:
    Cell-cell communication in bacteria is understood to facilitate the coordination of population-wide cooperative behavior in the form of concerted gene expression. The opportunistic pathogen Pseudomonas aeruginosa uses such a communication mechanism to regulate a large group of genes important to virulence strategies in this bacterium. This general mechanism of communication...
    Resource Type:
    Dissertation