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  • Silicon biogeochemistry in the open-ocean surface waters : insights from the Sargasso Sea and equatorial Pacific

    Creator:
    Krause, Jeffrey W.
    Abstract:
    Diatoms are a ubiquitous group of plankton responsible for 20-40% of oceanic primary production, and a higher fraction of organic matter export to the ocean interior. Diatoms actively transport dissolved inorganic silicon into their cells, and through the process of silicification (i.e. biogenic silica production) they build tough and intricate...
    Resource Type:
    Dissertation

  • 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:
    : Harnessing Heterogeneity in Human Gut Microbiome Data Abstract approved: Maude M. David The focus of this

  • Investigating the Impact of the Gut Microbiota on Rodent Behavior and their Interaction with Enteroendocrine Cells

    Creator:
    Singla, Priyanka
    Abstract:
    Gut-brain communication consists of bidirectional routes between cognitive centers of the brain and peripheral intestines. This bidirectional communication is the result of the interplay between enteroendocrine cells (EECs), enteric nervous system, central nervous system, the vagus nerve, and our microbiota. Multiple studies have associated gut microbial dysbiosis with neurological disorders...
    Resource Type:
    Masters Thesis
    Full Text:
    approved: ______________________________________________________ Maude M. David Gut-brain communication

  • Dosimetric Evaluation of Nasal Cavity Basal Cell Layer during Radiotracer Administration

    Creator:
    Flora, Rigel
    Abstract:
    New delivery methods for radiotracers are constantly being proposed. Two key properties of the delivery method must be analyzed: dose to patient and effectiveness of delivery. In this work, the localized skin dose for intranasal administration of 18F was determined utilizing MCNP code. An anatomically accurate nasal cavity was constructed...
    Resource Type:
    Masters Thesis
    Full Text:
    Abstract approved: ______________________________________________________ David M. Hamby

  • Three Essays on the Economics of Habitat and Landscape Restoration

    Creator:
    Nguyen, Tu
    Abstract:
    Natural landscapes around the world have experienced serious loss and degradation, which negatively impacts ecosystem service provision by these landscapes. As a result, there have been serious investments to restore natural capital. However, restoration faces complex trade-offs, such as that between restoration quality, or how closely the restored landscapes resembles...
    Resource Type:
    Dissertation
    Full Text:
    : ______________________________________________________ David M. Kling Natural landscapes around the world have experienced serious loss and

  • Development of a Fundamental Depth-Dependent Neutron Dosimetry Model

    Creator:
    Anspach, Logan J.
    Abstract:
    Current neutron dosimetry methods rely on the assumption that charged particle equilibrium (CPE) is established within the tissue medium. This maintains that the kinetic energy transferred to the medium (KERMA) is equivalent to absorbed dose. However, this assumption is only valid for large volumes such as the whole body. For...
    Resource Type:
    Masters Thesis
    Full Text:
    Abstract approved: ______________________________________________________ David M. Hamby Abstract

  • A Deterministic Photon and Electron Dosimetry Model for the Lens of the Eye

    Creator:
    Boozer, David L.
    Abstract:
    The lens dose equivalent (LDE) is a regulatory limit set to protect radiation workers. Current methods for estimating the LDE are specific to beam sources in a vacuum and require interpolating data from tables. A new set of deterministic equations for photon and electron point sources has been developed. These...
    Resource Type:
    Dissertation
    Full Text:
    approved: _____________________________________________________ David M. Hamby The lens dose

  • The Mathematics of Critical Shifts in Ecological Networks with Alternative Stable State Theory, A Potential Framework for Early Warning Indicators

    Creator:
    Kupperman, Michael D.
    Abstract:
    A long running problem in mathematical biology is the prediction of extinction events, a specialized case of the larger global stability problem found in differential equations and dynamical systems theory. A central technical question is how to introduce the randomness observed in real ecological systems not accounted for in deterministic...
    Resource Type:
    Honors College Thesis
    Full Text:
    : David Koslicki A long running problem in mathematical biology is the prediction of extinction events, a

  • Wasserstein β-Diversity Metrics over Graphs: Derivation, Efficient Computation and Applications

    Creator:
    McClelland, Jason
    Abstract:
    Microbial ecology has been transformed by metagenomics, the study of the genetic in-formation in entire communities of organisms. In the following we develop metagenomic tools arising from the classic Wasserstein metric as applied to questions regarding the diversity between microbial communities. We provide a novel proof of the characteriza-tion of...
    Resource Type:
    Dissertation
    Full Text:
    phylogenetic tree depicting approximately 3000 species from the spec- trum of Earth's biology. Source: David M

  • Eye Lens Doses from Oblique Sources

    Creator:
    Trakowski, Ian M.
    Abstract:
    Since the International Commission on Radiation Protection (ICRP) recommended a revision to the eye lens dose limits in ICRP Publication 118 (Stewart, 2012) the radiation protection community has conducted many new studies related to eye dosimetry. The recommended reduction of eye lens dose limits may result in the reduction of...
    Resource Type:
    Masters Thesis
    Full Text:
    : ______________________________________________________________ David M. Hamby Abstract: Since the International Commission on Radiation Protection (ICRP