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  • Arsenic methylation by marine cyanobacteria Prochlorococcus and Synechococcus

    Creator:
    Lee, Mikaela
    Abstract:
    Our experiments aimed to investigate responses of the marine cyanobacteria Prochlorococcus and Synechococcus to toxic arsenic species, such as arsenate, and to understand cellular mechanisms that contribute to arsenic tolerance. We used two strains of Prochlorococcus, a high-light adapted MED4 and low-light adapted MIT9313, both axenic, for cultivation experiments. For...
    Resource Type:
    Honors College Thesis
    Full Text:
    the degree of Honors Baccalaureate of Science in Microbiology (Honors Scholar

  • Biogeochemical Processing of Freshwater Carbon in the Anthropocene

    Creator:
    Buser, Jessica Z.
    Abstract:
    Freshwater systems cycle carbon along a spatial and temporal biogeochemical continuum, across which ecosystem processes contribute to transformations of organic matter (OM). Various ecological constraints impact rates OM transformation and production and consumption of the energetic end of respiration, methane. Microbiological processing and complete reduction of carbon substrates to methane...
    Resource Type:
    Dissertation
    Full Text:
    Microbiology presented on December 5, 2023 Title: Biogeochemical Processing of Freshwater Carbon in the

  • Consequences of Influenza A Virus on Pneumococcal Biofilm Formation and Stability in the Absence of Host Factors

    Creator:
    Nutter, Laura
    Abstract:
    Streptococcus pneumoniae and Influenza A Virus both primarily infect the upper respiratory tract, with more severe disease occurring during coinfection than would be caused by either pathogen independently. Until recently, characterization of the interactions between these two pathogens has occurred exclusively in the context of a host or using host-derived...
    Resource Type:
    Masters Thesis
    Full Text:
    Nutter for the degree of Master of Science in Microbiology presented on December 11, 2023 Title

  • Chemical and Genetic Investigations of Toxic Freshwater Cyanobacterial Blooms for Improved Monitoring and Understanding of Lake Ecology

    Creator:
    Collart, Lindsay P.
    Abstract:
    Toxin production by cyanobacterial harmful algal blooms (cyanoHABs) in freshwater systems has lasting ecological and human impacts. Nutrients, light availability, hydrology, and microbial community composition impact the frequency and intensity of toxic cyanoHABs. Climate change will exacerbate toxic cyanoHABs, making real time and predictive monitoring a vital tool for managing...
    Resource Type:
    Dissertation
    Full Text:
    P. Collart for the degree of Doctor of Philosophy in Microbiology presented on June 2, 2023

  • How Do Parasites Infect Salmon? Comparative Transcriptomics Reveal Myxozoan Adaptations for Parasitism

    Creator:
    Americus, Benjamin
    Abstract:
    The phylum Cnidaria contains three main branches: Anthozoa (corals, sea anemones) Medusozoa (jellyfish, hydra), and Endocnidozoa. This latter branch is characterized by parasitism and contains the microscopic fish-parasites Myxozoa. Myxozoa are highly simplified, consisting of only a few cell types, however they have retained the nematocyst stinging cells and complex...
    Resource Type:
    Dissertation
    Full Text:
    Benjamin Americus for the degree of Doctor of Philosophy in Microbiology presented on May 23, 2023

  • The Social Interactions of Pseudomonas aeruginosa

    Creator:
    Smith, Parker
    Abstract:
    Pseudomonas aeruginosa is a ubiquitous environmental microbe, opportunistic pathogen, and a highly social organism. P. aeruginosa utilizes a wide array of cooperative behaviors to adapt to the environmental conditions around it. These behaviors include quorum sensing (QS), a form a cell-to-cell signaling that coordinates the expression of secreted products in...
    Resource Type:
    Dissertation
    Full Text:
    Smith for the degree of Doctor of Philosophy in Microbiology presented on March 2, 2023 Title: The

  • Comparing Sediment Microbial Communities of Arctic Beaver Ponds to Tundra Lakes and Streams

    Creator:
    Shannon, Kelly
    Abstract:
    In recent decades the habitat of North American beaver (Castor canadensis) has expanded from boreal forests into pan-Arctic tundra ecosystems. It is unknown how the advance of beavers into Arctic watersheds will impact microbial communities responsible for the mineralization of organic matter (OM), which has implications for carbon cycling. To...
    Resource Type:
    Masters Thesis
    Full Text:
    Shannon for the degree of Master of Science in Microbiology presented on December 8, 2022. Title

  • Harnessing Heterogeneity in Human Gut Microbiome Data

    Creator:
    Tataru, Christine
    Abstract:
    The focus of this thesis is to design, characterize, and apply novel computational methods and molecular systems to interrogate heterogeneous human gut microbiome-related phenomena. In Chapter 2, I design, implement, and characterize a method for embedding co-occurrence patterns derived from massive 16s amplicon datasets. I use this method to 1....
    Resource Type:
    Dissertation
    Full Text:
    for the degree of Doctor of Philosophy in Microbiology presented on December 2, 2022. Title

  • Intestinal Lesions and Parasites Associated with Senescence and Prespawn Mortality in Chinook Salmon (Oncorhynchus tshawytscha)

    Creator:
    Nervino, Stephanie A.
    Abstract:
    Pre-spawning mortality (PSM) presents a major problem for population recovery of spring Chinook salmon (Oncorhynchus tshawytscha) in the Willamette River basin. In certain reaches and years, PSM has exceeded 90%. Histology has been used as the primary diagnostic method to investigate PSM in the Chinook Salmon, and a collection of...
    Resource Type:
    Masters Thesis
    Full Text:
    Nervino for the degree of Master of Science in Microbiology presented on August 11, 2022. Title

  • Characterization of Mycobacterium avium subsp. hominissuis Interactions with Host Macrophages and Multinucleated Giant Cells

    Creator:
    Joseph, Jayanthi J.
    Abstract:
    To examine the macrophage response to M. avium, I compared inflammasome and cytosolic sensor expression and activation. My result demonstrated that virulent strains of M. avium (A5 and 104) suppress IL-1β production and induce IFN-β production in macrophages. M. avium mutants deficient at DNA export in the biofilm exhibited reduced...
    Resource Type:
    Dissertation
    Full Text:
    Microbiology presented on August 10, 2022. Title: Characterization of Mycobacterium avium subsp