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Articles 1 - 8 of 8
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Uvrd1 Helicase Of Mycobacterium Tuberculosis That Can Be Activated By Multiple Unique Mechanisms, Ankita Chadda
Uvrd1 Helicase Of Mycobacterium Tuberculosis That Can Be Activated By Multiple Unique Mechanisms, Ankita Chadda
Arts & Sciences Electronic Theses and Dissertations
Abstract Mycobacterium tuberculosis (Mtb) causes tuberculosis disease in humans and is one of the leading causes of death worldwide due to infectious agents. During infection, Mtb is exposed to reactive oxygen species and reactive nitrogen intermediates from the host immune response that causes DNA damage. UvrD-like helicases are involved in DNA repair and use energy from ATP hydrolysis to translocate on single stranded DNA (ssDNA) or unwind double-stranded DNA (dsDNA) to remove the damaged DNA strand. Previous studies on UvrD-like helicases have shown that they exist in a monomer-dimer equilibrium and unwind only as dimers in the absence of accessory …
The Evolution Of Transposable Elements As Cis-Regulatory Elements In Mammals, Alan Y. Du
The Evolution Of Transposable Elements As Cis-Regulatory Elements In Mammals, Alan Y. Du
Arts & Sciences Electronic Theses and Dissertations
Transposable elements (TEs) are mobile genetic elements that make up a large proportion of mammalian genomes. Although TEs are highly prevalent genomic sequences, they have been understudied as they were once labeled as “junk DNA.” Despite their initial status as simple genomic parasites, recent studies have implicated TEs as cis-regulatory elements, supplying promoters, enhancers, and boundary elements. Functional testing of regulatory activity, however, remains a significant bottleneck. Nonetheless, due to their repetitive nature, TEs provide a unique model to examine the evolution of cis-regulatory elements, which has traditionally been difficult to study due to lack of homology at the sequence …
Optical Perturbation Of Protein Kinase A Activity Via Photoactivatable Inhibitor Peptides, Peter Chen
Optical Perturbation Of Protein Kinase A Activity Via Photoactivatable Inhibitor Peptides, Peter Chen
McKelvey School of Engineering Theses & Dissertations
Protein Kinase A (PKA) plays important roles in diverse biological processes such as sleep, long term memory, and synaptic plasticity. In addition, PKA also acts as an integrator of neuromodulator signaling though G protein-coupled receptor activation. However, despite genetic knockout and pharmacological inhibition experiments that demonstrate the importance of PKA, it is unclear where, when, or how PKA plays these roles in cellular physiology and behavior. In order to better understand the function of PKA in these processes, and how neuromodulator signaling drives complex behavioral changes, there exists a need for a method to selectively activate/inactivate PKA with high spatial …
Manage Your Money Wisely: How Consumers And Marketers Can Effectively Communicate Money Issues, Alexander Park
Manage Your Money Wisely: How Consumers And Marketers Can Effectively Communicate Money Issues, Alexander Park
Olin Business School Electronic Theses and Dissertations
Consumers and marketers find it challenging to communicate money matters. For example, consumers experience discomfort and uneasiness when discussing financial issues with their social relationships. Firms often receive backlash when sharing their good financial deeds (e.g., charitable efforts) with consumers. Because financial matters can be a sensitive topic, in my research, I explore the difficulties consumers and marketers experience when communicating money issues and how they can better navigate these problems.In Chapter One, I investigate a particularly uneasy interaction that consumers often face with their friends and acquaintances: the need to ask for money back. Seven fully preregistered studies (N …
Single-Molecule Super-Resolution Imaging Of Geobacter Sulfurreducens Under Anaerobic Conditions, Ziyi Hu
Single-Molecule Super-Resolution Imaging Of Geobacter Sulfurreducens Under Anaerobic Conditions, Ziyi Hu
McKelvey School of Engineering Theses & Dissertations
Geobacter sulfurreducens are anaerobic bacteria capable of making electrical contacts with other organisms and extracellular electron acceptors. The challenge of imaging live Geobacter bacteria is maintaining anaerobic conditions during the imaging process. In this thesis, we augment a single-molecule localization microscope (SMLM) with a home-built anaerobic imaging chamber and use constant argon bubbling to maintain oxygen-free imaging conditions. To validate the imaging protocol, we use the transient binding of Nile red to resolve the spherical morphology of lipid-coated glass spheres with nanoscale resolution. However, when imaging Geobacter, the distribution of Nile red localizations is non-uniform, both between different cells …
Preparing Non-Human Primates To Study Hand-Eye Coordination In Frontal Eye Fields (Fef) During Delayed Movement Task, Juliusz Cydzik
Preparing Non-Human Primates To Study Hand-Eye Coordination In Frontal Eye Fields (Fef) During Delayed Movement Task, Juliusz Cydzik
McKelvey School of Engineering Theses & Dissertations
ABSTRACT OF THE THESIS Preparing Non-Human Primates to Study Hand-Eye Coordination in Frontal Eye Fields (FEF) During Delayed Movement Task by Juliusz Cydzik Master of Science in Biomedical Engineering Washington University in St. Louis, 2023 Professor Lawrence Snyder, Chair Hand-eye coordination enables humans and non-human primates to use their hands and eyes to perform various tasks. We are interested in coordination at the systems level, where saccades and reaches are encoded. The parietal reach region (PRR), situated at the posterior end of the intraparietal sulcus (IPS) and overlapping portions of the medial intraparietal area (MIP) and V6a, is commonly attributed …
Elsewhere: In Defense Of Daydreaming, Alex Braden
Elsewhere: In Defense Of Daydreaming, Alex Braden
MFA in Visual Art
Much like music, organic life is an absurd, improbable, and serendipitous instance. I set circular, electric, acoustic, and magnetic forces in motion and allow them to coalesce freely in the hopes of synthesizing unexpected moments of beauty, connection, and harmony.
Comparison Of In-Vitro 3d Human Embryoids With Current Models For Gastrulation, Jin Park
Comparison Of In-Vitro 3d Human Embryoids With Current Models For Gastrulation, Jin Park
McKelvey School of Engineering Theses & Dissertations
Gastrulation is an early morphogenetic process that is conserved across most metazoans and lays out the future body plan through the formation and shaping of the three germ layers: endoderm, mesoderm, and ectoderm. Despite its importance, not much is known about the events surrounding human gastrulation that occurs in utero due to ethical and technical limitations on studying human embryos. Therefore, many researchers have devised protocols for creating in vitro models of gastrulation using embryonic stem cells. Initially starting with mouse embryonic stem cells, the field of in vitro embryo models has advanced rapidly, with protocols using human embryonic stem …