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Filtering by: Creator Welter, Stephen C. Remove constraint Creator: Welter, Stephen C. Academic Affiliation Microbiology Remove constraint Academic Affiliation: Microbiology Decade 2010-2019 Remove constraint Decade: 2010-2019

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  • Investigation of Nematocyst Discharge in Parasitic Cnidarians (Myxozoa)

    Creator:
    Americus, Benjamin E.
    Abstract:
    Myxozoans are an enigmatic group of obligately parasitic, microscopic cnidarians. They diverged from their free-living relatives over 600 million years ago and have highly reduced genomes. However, they have retained nematocyst stinging cells which characterize the phylum Cnidaria. Free-living cnidarians utilize this cellular weaponry for defense and predation whereas the...
    Resource Type:
    Masters Thesis
    Full Text:
    : ______________________________________________________ Stephen D. Atkinson Myxozoans are an enigmatic group of obligately parasitic, microscopic

  • Disturbances in a marine bacterioplankton system drive community assembly towards niche-based processes

    Creator:
    Vergin, Kevin L.
    Abstract:
    Over 100 monthly bacterioplankton DNA samples, from each of the surface and 200 m depths at the Bermuda Atlantic Time-series Study (BATS) site, were analyzed for community assembly processes. Correlation networks, filtered for potential autocorrelation artifacts, were constructed for each depth. Network characteristics for the two depths were remarkably similar...
    Resource Type:
    Masters Thesis
    Full Text:
    . Abstract approved: ______________________________________________________ Stephen J. Giovannoni

  • Microbial diversity, metabolic potential, and transcriptional activity along the inner continental shelf of the Northeast Pacific Ocean

    Creator:
    Bertagnolli, Anthony D.
    Abstract:
    Continental shelves located along eastern boundary currents occupy relatively small volumes of the world’s oceans, yet are responsible for a large proportion of global primary production. The Oregon coast is among these ecosystems. Recent analyses of dissolved oxygen at shallow depths in the water column has suggested increasing episodes of...
    Resource Type:
    Dissertation
    Full Text:
    : _____________________________________________________ Stephen J. Giovannoni Continental shelves located along eastern boundary currents occupy

  • Quantification of Osmolytes in the Sargasso Sea Surface Layer Water Column

    Creator:
    Muslin, Omran
    Abstract:
    Oceanic carbon cycling plays a major role in determining global atmospheric CO₂. A better understanding of dissolved organic matter and its constituents in the water column and how it affects marine carbon cycling is sought after. This study successfully measured osmolytes, low molecular zwitterionic compounds derived from amino acids, in...
    Resource Type:
    Masters Thesis
    Full Text:
    : ______________________________________________________ Stephen J. Giovannoni Oceanic carbon cycling plays a major role in determining

  • Genome-enabled investigation of the minimal growth requirements andphosphate metabolism for Pelagibacter marine bacteria

    Creator:
    Carini, Paul J.
    Abstract:
    Members of the SAR11 clade of heterotrophic α-proteobacteria are ubiquitous and abundant in the world's oceans where they are thought to play a pivotal role in the global carbon cycle. The first SAR11 bacterium cultivated in vitro, 'Candidatus Pelagibacter ubique' HTCC1062 (Ca. P. ubique), was isolated by dilution into sterile...
    Resource Type:
    Dissertation
    Full Text:
    Phosphate Metabolism for Pelagibacter Marine Bacteria Abstract approved: Stephen J. Giovannoni

  • Single-Cell Genomics of Uncultivated Marine Bacteria

    Creator:
    Landry, Zachary
    Abstract:
    Historically, the difficulty of obtaining pure cultures of abundant marine microbial plankton has an obstacle to reconstructing the underlying mechanisms of biogeochemistry in the ocean. While a number of dominant marine species from the ocean surface have been cultured, the dominant microbial plankton of the dark ocean proved far more...
    Resource Type:
    Dissertation
    Full Text:
    : ______________________________________________________ Stephen Giovannoni Historically, the difficulty of obtaining pure cultures of abundant marine

  • Molecular Analysis of Environmental Water Samples as a Monitoring Method for the Fish Parasite Ichthyophthirius multifiliis

    Creator:
    Howell, Claire K.
    Abstract:
    Parasites are ubiquitous members of ecological communities, capable of contributing to the decline of vulnerable populations. Therefore, monitoring parasite level is a critical component for host management. Molecular tools, such as quantitative polymerase chain reaction (qPCR), can be valuable additions to monitoring protocols that assess parasitic disease risk to hosts....
    Resource Type:
    Masters Thesis
    Full Text:
    the development of my project. As well as Sascha Hallett and Stephen Atkinson, who’s generosity in

  • Metagenomics: Microbial diversity through a scratched lens

    Creator:
    Temperton, Ben and Giovannoni, Stephen J.
    Abstract:
    Since nucleic acids were first extracted directly from the environment and sequenced, metagenomics has grown to one of the most data-rich and pervasive techniques for understanding the taxonomic and functional diversity of microbial communities. In the last decade, cheaper sequencing has democratized the application of metagenomics and generated billions of...
    Resource Type:
    Article
    Full Text:
    Ben Temperton1* and Stephen J. Giovannoni1 2 3 1Department of Microbiology, Oregon State

  • Bioinformatics applied to freshwater cyanobacterial blooms and cyanophage

    Creator:
    Schwartz, Andrew D.
    Abstract:
    Freshwater cyanobacterial blooms are a nuisance and health threat in the Pacific Northwest. The accepted methods of characterizing these blooms by microscopic cell counts cannot differentiate between toxic and non-toxic strains of the cyanobacterium Microcystis. Also, there is limited understanding of freshwater cyanophage that may control bloom dynamics. In order...
    Resource Type:
    Masters Thesis
    Full Text:
    ) ORFs (# of) tRNAs (# of) G+C% Coding % of genome Genbank accession # Deposition Date T4

  • Impacts of microbial chemical interactions on marine plankton physiology

    Creator:
    Moore, Eric R.
    Abstract:
    The bioavailability of chemical compounds in the marine environment fundamentally influences the growth and physiology of microorganisms. Organic and inorganic chemicals that are produced by some marine plankton can be consumed by other plankton for energy production, growth, or to initiate essential physiological processes. Cultures of the diatom Thalassiosira pseudonana,...
    Resource Type:
    Dissertation
    Full Text:
    , James, Kelsey, Lindsay, Chris, Luis, Stephen, Quinn, Sarah, Chih Ping, Jimmy, Nerissa, Bethan, Duncan