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  • Understanding chlamydial biology through genome sequencing and comparative genomics

    Creator:
    Jeffrey, Brendan
    Abstract:
    The human pathogen Chlamydia trachomatis displays different phenotypes between serovars both in vivo and in vitro. The study of chlamydial biology has been hampered by the lack of a tractable genetic system. Here, chlamydial isolates with known phenotypes as well as strains generated though recombination were fully sequenced to address...
    Resource Type:
    Dissertation
    Full Text:
    THE DISSERTATION OF Brendan Jeffrey for the degree of Doctor of Philosophy in Molecular and Cellular

  • Characterization of the genomic islands from tetracycline-resistant Chlamydia suis

    Creator:
    Dugan, Jae
    Abstract:
    Tetracycline (Tet)-resistant strains of Chlamydia suis were isolated from swine farms in the Midwest. The isolation of the resistant strains was significant because Tet is an antibiotic used to treat infections by veterinarians and doctors. One of the tetracycline (Tet)-resistant strains, R19, was able to survive in Tet up to...
    Resource Type:
    Dissertation
    Full Text:
    ABSTRACT OF THE DISSERTATION OF JAE DUGAN for the degree of Doctor of Philosophy in Molecular and

  • Molecular and cellular characterization of the intracellular phenotype of Mycobacterium avium

    Creator:
    Early, Julie V.
    Abstract:
    Mycobacterium avium cause disseminated disease in immunocompromised people such as AIDS patients. Subsequent to crossing the intestinal epithelium, M. avium thrive within vacuoles in macrophages. The bacteria exhibit a different, more invasive, phenotype after being in macrophages compared to M. avium from laboratory conditions. We hypothesized that this intracellular phenotype...
    Resource Type:
    Dissertation
    Full Text:
    degree of Doctor of Philosophy in Molecular and Cellular Biology presented on March 6, 2009. Title

  • Recombination, resistance, and drug discovery in Chlamydia

    Creator:
    Sandoz, Kelsi
    Abstract:
    The intracellular life cycle of Chlamydia has been difficult to study due to the inability to genetically manipulate the bacteria. As a result, indirect methods have been employed to study the pathogen and the aspects that contribute to its unique intracellular life cycle. A wide variety of laboratory adapted strains,...
    Resource Type:
    Dissertation
    Full Text:
    dissertation.docx AN ABSTRACT OF THE DISSERTATION OF Kelsi Sandoz for the degree of Doctor of Philosophy in

  • Genomic-assisted determination of the natural nutrient requirements of the cosmopolitan marine bacterium 'Candidatus Pelagibacter ubique'

    Creator:
    Tripp, H. James
    Abstract:
    To identify factors limiting 'Candidatus Pelagibacter ubique' maximum cell density and growth rate in pure culture on seawater, the genome sequence of 'Cand. P. ubique' was analyzed, culturing experiments with organic and inorganic nutrient additions were made, and radiotracer uptake experiments were performed. The genome was sequenced, custom data mining...
    Resource Type:
    Dissertation
    Full Text:
    AN ABSTRACT OF THE DISSERTATION OF H. James Tripp for the degree of Doctor of Philosophy in

  • Mechanisms for the interaction of environmental mycobacteria with host cells

    Creator:
    Harriff, Melanie J.
    Abstract:
    Environmental mycobacteria are important opportunistic pathogens for many hosts, including humans, cattle, and fish. Two well-studied species are Mycobacterium avium subsp. avium, a significant cause of disseminated bacterial disease in patients with AIDS, and Mycobacterium avium subsp. paratuberculosis, the cause of Johne’s disease in cattle. Many other species that are...
    Resource Type:
    Dissertation
    Full Text:
    THE DISSERTATION OF MELANIE J. HARRIFF for the degree of Doctor of Philosophy in Molecular and

  • Identification of an aerotaxis transducer in Vibrio cholerae

    Creator:
    Boin, Markus A.
    Abstract:
    The ability to move towards favorable environmental conditions, called chemotaxis, is common among motile bacteria. In particular aerotaxis has been extensively studied in Escherichia coli. Three putative aer gene homologs were identified in the V. cholerae genome designated VCAer-1 (VC0512) VCAer-2 (VCA0658), and VCAer-3 (VCA0988). Deletion analyses indicated that only...
    Resource Type:
    Masters Thesis
    Full Text:
    particularly aerotaxis in the biology of V. cholerae, including its environmental and infectious life stages

  • Physiological, proteomic, and whole-genome transcriptional responses of Nitrosomonas europaea to heavy metals (Zn²⁺,Cd²⁺, Cu²⁺, and Hg²⁺) and cyanide : identification of heavy metals and cyanide stress response genes

    Creator:
    Park, Sunhwa
    Abstract:
    Nitrosomonas europaea (ATCC19718) participates in the biological removal of nitrogen from wastewater by oxidizing ammonia to nitrite, the first step in nitrification. This bacterium is sensitive to heavy metals (Zn²⁺, Cd²⁺, Cu²⁺, and Hg²⁺) and cyanide, compounds commonly encountered in wastewater treatment plants. Therefore, we characterized physiological and transcriptional responses...
    Resource Type:
    Dissertation
    Full Text:
    degree of Doctor of Philosophy in Biological and Ecological Engineering presented on May 1, 2008

  • Molecular basis for Clostridium perfringens spore resistance to heat and other environmental stress factors

    Creator:
    Raju, Deepa
    Abstract:
    Clostridium perfringens type A isolates producing enterotoxin (CPE) are an important cause of both food poisoning (FP) and non food borne gastrointestinal diseases (NFBGID) in both humans and animals. C. perfringens type A food poisoning is caused by isolates carrying the CPE encoding gene (cpe) on the chromosome while the...
    Resource Type:
    Dissertation
    Full Text:
    AN ABSTRACT OF THE THESIS OF Deepa Raju for the degree Doctor of Philosophy in Microbiology

  • Quorum sensing gene regulation in Pseudomonas aeruginosa

    Creator:
    Gupta, Rashmi
    Abstract:
    Pseudomonas aeruginosa is an opportunistic human pathogen that infects immunocompromised individuals such as those suffering from burns or the genetic disorder cystic fibrosis. This organism utilizes a cell-cell communication mechanism known as quorum sensing (QS) to coordinate virulence gene expression and biofilm formation. It has three interconnected QS systems, namely...
    Resource Type:
    Dissertation
    Full Text:
    Gupta for the degree of Doctor of Philosophy in Microbiology presented on March 19, 2012. Title