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Dissecting Molecular Pathways That Ensure Proper Chromosome Segregation And Cell Division, Anna Ye
Dissecting Molecular Pathways That Ensure Proper Chromosome Segregation And Cell Division, Anna Ye
Doctoral Dissertations
Equal segregation of the genome is a prerequisite for cell survival. During cell division the duplicated DNA is compacted into chromosomes and a multi-protein macrostructure, known as the kinetochore (Kt), is assembled on each copy of compacted DNA. Simultaneously, the mitotic spindle, which is made up of microtubules (MTs), is built to facilitate the equal distribution of the chromosomes between the resulting daughter cells. Kinetochores mediate the interaction between the MTs and the chromosomes, properly positioning them for segregation. To ensure that the DNA is equally divided in every cell division, cells have built a surveillance system to detect any …
Golfer Exposure To Pesticides, Jeffery Doherty
Golfer Exposure To Pesticides, Jeffery Doherty
Doctoral Dissertations
There is concern among industry regulators, turfgrass managers, and the general public over human exposure to pesticides following their application to turfgrass. The residential aspect of turfgrass applications raises concerns about exposure to infants and children, as well as adults. To accurately determine the exposure of golfers to turfgrass pesticides, it is necessary to understand their transfer and absorption dynamics, as well as the routes of golfer exposure. Previous research has demonstrated that exposure to some turfgrass pesticides is at a level that would concern USEPA risk assessors using the USEPA Hazard Quotient (HQ) criteria (1). This current research used …
Understanding Food Literacy And Its Use In A Technology-Driven Nutrition Education Program For Adolescents., Catherine A. Wickham
Understanding Food Literacy And Its Use In A Technology-Driven Nutrition Education Program For Adolescents., Catherine A. Wickham
Doctoral Dissertations
One in three adolescents in the U.S. is overweight or obese. The dietary habits of this population are concerning as few meet current dietary recommendations for consuming fruits and vegetables. Equally troubling among this group is the consumption of sugar-sweetened beverages and the lack of physical activity. Studies that investigate the link between nutrition knowledge, attitudes, and behaviors have shown mixed results and new methods to investigate this relationship are needed. Food literacy is a new term that has risen out of the health and nutrition literacy fields. Food literacy seeks to examine the complex relationship between knowledge, attitudes, and …
Imidacloprid, A Neonicotinoid Insecticide, Impairs Lipid And Glucose Metabolism, Quancai Sun
Imidacloprid, A Neonicotinoid Insecticide, Impairs Lipid And Glucose Metabolism, Quancai Sun
Doctoral Dissertations
Emerging evidence suggests that environmental pollutants, including insecticides, are linked to excessive weight gain and altered glucose homeostasis. However, there is currently limited knowledge regarding the biochemical mechanisms by which exposure to insecticides contribute to obesity and its associated pathologies. We first studied the influence of fipronil (a phenylpyrazole family insecticide) on 3T3-L1 adipogenesis. Recently imidacloprid, a neonicotinoid insecticide, was reported to potentiate adipogenesis and insulin resistance in vitro. The current studies also determined the effects of imidacloprid exposure and its interaction with dietary fat in the development of adiposity and insulin resistance using both male and female C57BL/6J …
Microbial Competition In Bioelectrochemical Systems, Varun Srinivasan
Microbial Competition In Bioelectrochemical Systems, Varun Srinivasan
Doctoral Dissertations
Bioelectrochemical systems(BESs)/ microbial fuel fells (MFCs) are a well-studied potential technology for bioremediation and decentralized wastewater treatment. However, progress has been somewhat stalled at the bench-scale. In well controlled experiments electron recovery is high. In natural environments, wastewaters are complex and anode-respiring bacteria can be outcompeted in the presence of competing microorganisms, leading to a loss in electron-recovery and power production. Furthermore, the cathode of the MFC plays a vital role in providing flexibility for treatment options but is an understudied part of MFCs. Modelling Intracellular Competition in a Denitrifying Biocathode: One potential MFC configuration uses an organic-oxidizing anode biofilm …
Specialization And Trade-Offs In Plant-Feeding Insects, Daniel Peterson
Specialization And Trade-Offs In Plant-Feeding Insects, Daniel Peterson
Doctoral Dissertations
The immense diversity of life on Earth has been attributed to the partitioning of available resources into ecological niches, but it is not obvious what determines the niche size of each species. For example, most plant-feeding insects consume only one or a few closely-related host-plant species despite the advantages of having a broader diet. Many researchers have therefore suggested that the evolution of broad diets in plant-feeding insects must be constrained by genetic trade-offs between adaptations to alternative host-plants. Despite its intuitive feel, however, little empirical evidence in support of the trade-off hypothesis has emerged from decades of experimental studies …
Protein-Nanoparticle Co-Engineering: Self-Assembly, Intracellular Protein Delivery, And Crispr/Cas9-Based Gene Editing, Rubul Mout
Doctoral Dissertations
Direct cytoplasmic delivery of gene editing nucleases such CRISPR/Cas9 systems and therapeutic proteins provides enormous opportunities in curing human genetic diseases, and assist research in basic cell biology. One approach to attain such a goal is through engineering nanotechnological tools to mimic naturally existing intra- and extracellular protein delivery/transport systems. Nature builds transport systems for proteins and other biomolecules through evolution-derived sophisticated molecular engineering. Inspired by such natural assemblies, I employed molecular engineering approaches to fabricate self-assembled nanostructures to use as intracellular protein delivery tools. Briefly, proteins and gold nanoparticles were co-engineered to carry complementary electrostatic recognition elements. When these …
Regulated Proteolysis Of Dnaa Coordinates Cell Growth With Stress Signals In Caulobacter Crescentus, Jing Liu
Regulated Proteolysis Of Dnaa Coordinates Cell Growth With Stress Signals In Caulobacter Crescentus, Jing Liu
Doctoral Dissertations
DNA replication is an essential process in all domains of life. Replication must be precisely regulated, especially at the step of initiation. In bacteria, the replication initiator DnaA is regulated by multiple post-translational regulations to ensure timely replication. Caulobacter crescentus has the most strict replication regulation that DNA only replicates once per cell cycle, and proteolysis of DnaA identified in this species is the only irreversible way to inhibit DnaA, suggesting it might be pivotal to restricting DNA replication. However, the responsible protease(s) and mechanism for its degradation remain unclear since its first discovery in 2005. In this thesis, I …
Sex Differences In Estradiol Signaling In The Zebra Finch (Taeniopygia Gutatta) Auditory Cortex, Amanda Krentzel
Sex Differences In Estradiol Signaling In The Zebra Finch (Taeniopygia Gutatta) Auditory Cortex, Amanda Krentzel
Doctoral Dissertations
Although several sex differences have been described in brain structure, function, and development, sex as a biological factor is underrepresented in neuroscience studies. In the mammalian brain, there are sex differences in the mechanism of rapid estradiol actions on neuronal physiology. In the songbird, the brain is a major source of estradiol production, and estradiol rapidly modulates auditory responsiveness through dynamic changes and an unknown receptor mechanism. I set out to determine if there are sex differences in rapid estradiol modulation of auditory cortical activity, as has been shown in other systems. I tested this hypothesis through three aims: 1) …
Physical Activity And Age-Related Mechanical Risk Factors For Knee Osteoarthritis, Jocelyn F. Hafer
Physical Activity And Age-Related Mechanical Risk Factors For Knee Osteoarthritis, Jocelyn F. Hafer
Doctoral Dissertations
Knee osteoarthritis is an age-related disease which will affect nearly 50% of individuals in their lifetime. Because there are currently no treatments to substantially slow the progression of this disease, it is important to identify mechanisms to reduce the risk of osteoarthritis initiation. Osteoarthritis is a disease which is at least partially mediated by mechanical factors which may result from age-related changes in gait. The extent to which habitual physical activity can modify the impact of age on gait, knee mechanics, and thus cartilage loading is unknown. The aim of this dissertation was to examine the effects of age and …
A Comprehensive Validation Of Activity Trackers For Estimating Physical Activity And Sedentary Behavior In Free-Living Settings, Albert R. Mendoza
A Comprehensive Validation Of Activity Trackers For Estimating Physical Activity And Sedentary Behavior In Free-Living Settings, Albert R. Mendoza
Doctoral Dissertations
The aim of study one of this dissertation was to compare consumer activity trackers (ATs) with the research-grade ActiGraph™ GT3X-BT accelerometer (AG) in estimating energy expenditure (EE) and steps during orbital shaking at different frequencies. To address this aim, we utilized an electronic orbital shaking protocol (twenty-four, 3-minute trials; 2-hour trials). For all comparisons, the AG served as the reference measure. In the 3-min protocol, we showed that on average, the NL-1000 pedometer (NL) produced the lowest error (-9 steps/3-min) at 0.9 Hz (corresponding to moderate intensity). The magnitude of the error for the NL was 14 steps/3-min at a …
Pore Forming Protein Assembly And The Use In Nanopore Sensing: A Study On E. Coli Proteins Clya And Ompg, Monifa Fahie
Pore Forming Protein Assembly And The Use In Nanopore Sensing: A Study On E. Coli Proteins Clya And Ompg, Monifa Fahie
Doctoral Dissertations
Pore forming proteins are typically the proteins that form channels in membranes. They have several roles ranging from molecule transport to triggering the death of a cell. This work focuses on two E. coli pore forming proteins that have vastly differing roles in nature. Outer membrane protein G (OmpG) is an innocuous β-barrel porin while Cytolysin A (ClyA) is an α-helical pore forming toxin. For OmpG we probed its potential to be a nanopore sensor for protein detection and quantification. A small high affinity ligand, biotin, was covalently attached to loop 6 of OmpG and used to capture biotin-binding proteins. …
Quantifying Gait Adaptability: Fractality, Complexity, And Stability During Asymmetric Walking, Scott W. Ducharme
Quantifying Gait Adaptability: Fractality, Complexity, And Stability During Asymmetric Walking, Scott W. Ducharme
Doctoral Dissertations
Successful walking necessitates modifying locomotor patterns when encountering organism, task, or environmental constraints. The structure of stride-to-stride variance (fractal dynamics) may represent the adaptive capacity of the locomotor system. To date, however, fractal dynamics have been assessed during unperturbed walking. Quantifying gait adaptability requires tasks that compel locomotor patterns to adapt. The purpose of this dissertation was to determine the potential relationship between fractal dynamics and gait adaptability. The studies presented herein represent a necessary endeavor to incorporate both an analysis of gait fractal dynamics and a task requiring adaptation of locomotor patterns. The adaptation task involved walking asymmetrically on …
Microbial Dynamics And Design Considerations For Decentralized Microbial Fuel Cell Applications, Cynthia Castro
Microbial Dynamics And Design Considerations For Decentralized Microbial Fuel Cell Applications, Cynthia Castro
Doctoral Dissertations
The purpose of this dissertation was to assess the practicality of using microbial fuel cells (MFCs) as alternative sanitation systems for wastewater treatment and energy recovery, focusing on identifying key design considerations for treating high strength wastewater and managing alternative metabolic pathways. We evaluated the energetic outputs of a lab-based pilot MFC designed to treat complex organics present in both synthetic feces and municipal wastewater. The pilot MFC produced two energetic products, methane and electricity, when treating two types of complex wastewaters. The energetic products associated with anode respiration and methanogenesis were simultaneously observed and yielded a combined energy ouput …
Robust Biosensors For Healthcare Applications: From High-Content Screening To Point-Of-Care Testing, Ngoc D. B. Le
Robust Biosensors For Healthcare Applications: From High-Content Screening To Point-Of-Care Testing, Ngoc D. B. Le
Doctoral Dissertations
Efficient detection of proteins, mammalian cells, microorganisms and other biological systems in complex mixture is essential in disease diagnosis and environmental health. Therefore, technological platforms that provide sensors of high sensitivity, selectivity and stability are greatly desired. Recently, the ‘chemical-nose’ sensing approach has proved to be an effective strategy for profiling bio-relevant targets in complex mixtures. Detecting analytes in complex mixture is a challenge that conventional specificity-based sensors are still trying to solve due to the requirement of prior knowledge of the analyte, which is unknown in many cases. This thesis focuses on how to develop simple and robust …
All Roads Lead To Weediness: Stories About Weedy Rice Origins, Weedy Genes And Weed Competitiveness, Zhongyun Huang
All Roads Lead To Weediness: Stories About Weedy Rice Origins, Weedy Genes And Weed Competitiveness, Zhongyun Huang
Doctoral Dissertations
Weedy rice (Oryza spp.), a weedy relative of cultivated rice (O.sativa), infests and persists in cultivated rice fields worldwide. Many weedy rice populations have evolved similar adaptive traits, considered part of the ‘agricultural weed syndrome’, making this an ideal model to study the genetic basis of parallel evolution. Using population genetics analyses of South Asian and US weedy rice, my research reveals multiple independent evolution events giving rise to weed groups in the two geographic areas. Weeds in South Asia have highly heterogenous genetic backgrounds, with contributions from both cultivated varieties (aus and indica) …
The Role Of Sleep On Inhibitory Control In Young Children With Attention-Deficit/Hyperactivity Disorder (Adhd), Amanda Cremone
The Role Of Sleep On Inhibitory Control In Young Children With Attention-Deficit/Hyperactivity Disorder (Adhd), Amanda Cremone
Doctoral Dissertations
Alongside the hallmark symptoms of hyperactivity and inattention, children with attention-deficit/hyperactivity disorder (ADHD) often report having sleep problems. Although sleep deficits are consistently found when evaluated subjectively, impairments in sleep physiology are inconsistent. Compared to typically developing (TD) children, children with ADHD have greater spectral power in the delta (0.5 to 4 Hz) and theta frequency bands (4 to 7 Hz). Moreover, activity in these bands is differentially related to cognitive outcomes in ADHD and TD populations. As such, this dissertation sought to examine relations between sleep physiology and inhibitory control, a primary deficit of ADHD, in young children with …
Biology, Molecular Systematics, Population Dynamics And Control Of A Stem Gall Wasp, Zapatella Davisae (Hymenoptera: Cynipidae), Monica Davis
Doctoral Dissertations
Gall wasps are phytophagous insects that often go unnoticed, however, when they are released from their natural enemies, they have the capacity to outbreak and cause extensive foliar damage. One such outbreaking pest, Zapatella davisae, causes significant damage and mortality to black oak, Quercus velutina. In recent years, black oak decline has been documented in Long Island, New York and coastal New England. Little is known about the lifecycle, distribution or population dynamics of Zapatella davisae and the taxonomy of the species is still unclear. My first study described the biology and distribution of Z. davisae. Zapatella …
Understanding The Impact Of Oxygen Concentration And Active Packaging On Controlling Lipid Oxidation In Oil-In-Water Emulsions, David Johnson
Understanding The Impact Of Oxygen Concentration And Active Packaging On Controlling Lipid Oxidation In Oil-In-Water Emulsions, David Johnson
Doctoral Dissertations
Consumer concern over synthetic food antioxidants have led researchers to seek alternative natural, or ‘clean’ label, solutions to prevent lipid oxidation. Unfortunately, natural antioxidants are often not as effective as their synthetic counterparts. As a result, there remains a need to develop active packaging strategies and maximize current antioxidant strategies in food applications. Active packaging, or packaging that has a function beyond being an inert barrier, is an attractive strategy to limit lipid oxidation in foods. Active packaging performs the work of an antioxidant without appearing on the package label. The work presented here builds upon active packaging development as …
Mechanistic Studies Of Peptide-Mediated Protein Transport Across Droplet-Interface Bilayers, Jing Huang
Mechanistic Studies Of Peptide-Mediated Protein Transport Across Droplet-Interface Bilayers, Jing Huang
Doctoral Dissertations
Pep-1 is a promising peptide tool that delivers proteins and peptides into cells with conserved bioactivity. Pep-1 has great potential because of the high efficiency and lack of toxicity. The mechanism of Pep-1-mediated transport is not fully understood. In my thesis, droplet-interface bilayer (DIB) has been used for the mechanistic studies of Pep-1. Here, DIB is developed for different functions such as quantitation of protein translocation, solution exchange to a formed bilayer and simultaneous observation of multiple membranes. Research work on Pep-1 with DIB reveals that the negative charge of the inner membrane leaflet plays a significant role in promoting …
The Effect Of Pericyte Cell Therapy On Postischemic Neovascularization In Wild Type And Type 2 Diabetic Mice, Katherine E. Hayes
The Effect Of Pericyte Cell Therapy On Postischemic Neovascularization In Wild Type And Type 2 Diabetic Mice, Katherine E. Hayes
Doctoral Dissertations
Peripheral artery disease is an atherosclerotic disease that causes limb ischemia and has few effective treatments. Stem cell therapy is a promising treatment option, but concomitant diabetes may limit its effectiveness. The purpose of this study was to evaluate the therapeutic potential of skeletal muscle pericytes to augment postischemic neovascularization following the induction of limb ischemia in wild type and type 2 diabetic (T2DM) mice. The hypothesis was that diabetes impairs the ability of skeletal muscle pericytes to augment postischemic neovascularization and differentiate in vivo. Pericytes were isolated via fluorescence activated cell sorting for CD45-CD34-CD146 …
The Effects Of Anthropogenic Stress On Nitrogen-Cycling Microbial Communities In Temperate And Tropical Soils, George S. Hamaoui Jr.
The Effects Of Anthropogenic Stress On Nitrogen-Cycling Microbial Communities In Temperate And Tropical Soils, George S. Hamaoui Jr.
Doctoral Dissertations
In this dissertation several research studies are discussed that characterize the effects of anthropogenic, or human-induced, stress on both ammonia-oxidizing and total bacterial soil microbial communities. The disturbances of land-use change in tropical, South American rainforests and artificial warming and nitrogen (N) fertilization in temperate, North American forests were investigated as these disturbances represent past and current disturbances caused by human landscape alteration and climate change. Initially, the response of soil ammonia-oxidizing microbial communities to land-use change from primary rainforest to pasture and, finally, back to secondary forest was determined. Next, these analyses of land-use change effects were expanded to …
Utilization Of Natural Emulsifiers And Their Derivatives To Formulate Emulsion-Based Delivery Systems For Hydrophobic Nutraceuticals, Cansu Gumus
Doctoral Dissertations
There is increasing consumer demand for food products that are more natural, sustainable, and environmentally friendly. Industry has responded by trying to identify natural alternatives to synthetic functional ingredients within these products. In this study, the ability of Maillard conjugation products, and several legume proteins were investigated to act as nature-derived or natural emulsifiers in oil-in-water emulsions fortified with hydrophobic nutraceuticals. Casein-coated oil droplets enriched with lutein were highly unstable to flocculation near their isoelectric point due to the reduction in electrostatic repulsion. However, casein-dextran-coated droplets were stable, which was attributed to strong steric repulsion by the dextran moiety. The …
Statistical Methods For High Dimensional Data Arising From Large Epidemiological Studies, Hui Xu
Statistical Methods For High Dimensional Data Arising From Large Epidemiological Studies, Hui Xu
Doctoral Dissertations
In this thesis, we propose statistical models for addressing commonly encountered data types and study designs in large epidemiologic investigations aimed at understanding the molecular basis of complex disorders. The motivating applications come from diverse disease areas in Women's Health, including the study of type II diabetes in the Women's Health Initiative (WHI), invasive breast cancer in the Nurses' Health Study and the study of the metabolomic underpinnings of cardiovascular disease in the WHI. We have also put significant effort into making the implementation of the proposed methods accessible through freely available, user-friendly software packages in R. The first chapter …
Effects Of Permethrin, A Pyrethroid Insecticide, On Glucose And Lipid Metabolism, Xiao Xiao
Effects Of Permethrin, A Pyrethroid Insecticide, On Glucose And Lipid Metabolism, Xiao Xiao
Doctoral Dissertations
Over the last few decades, the decline of using organochlorine and organophosphorus insecticides has partially contributed to the rising utilization of newer synthetic insecticides, which are considered as less harmful and more environmental friendly than the older generation of insecticides. Pyrethroid insecticides are one of the newer insecticide classes reported with better biodegradability and low mammalian toxicity without sacrificing its insecticidal efficacy. Permethrin is one of the most widely used pyrethroid insecticides with structural similarity with natural pyrethrin insecticide from the flowers of Chrysanthemum cinerariifolium. Since its introduction in the 1970’s, permethrin has been extensively used in medicine, military, …
Biotransformation Of Polymethoxyflavones And Its Implication On Biological Activities, Minqi Wang
Biotransformation Of Polymethoxyflavones And Its Implication On Biological Activities, Minqi Wang
Doctoral Dissertations
In this thesis, the tissue distribution and in vivo biotransformation of nobiletin in rodents were demonstrated on three types of rodents, i.e.A-J female mice, CD-1 male mice and male F344 male rats. The effects of colonic metabolites of CD-1 mice on colonic carcinogenesis and inflammation were determined. In order to mimic the long-term dietary consumption of PMFs from food or dietary supplements, we applied oral administration by mixing PMFs with standard diet to rodents who have free access to food. Moreover, nobiletin (NBT), one of the most abundant PMFs in nature, and its major metabolties were incubated with mice …
Estradiol Enhances Inflammation During Pubertal Development In Female Mice, Amarylis Velez-Perez
Estradiol Enhances Inflammation During Pubertal Development In Female Mice, Amarylis Velez-Perez
Doctoral Dissertations
There is a dynamic interaction between the immune, endocrine, and central nervous systems. The main function of the immune system is to protect the organism from pathogens by engaging a network of organs, cells and signaling molecules. Recently, the resident-immune cells of the brain have been found to be critical in supporting the full development of neural circuits during sensitive periods of development. However, over-activation of the immune system during this period can alter the typical trajectory of maturing neural circuits. LPS (lipopolysaccharide) administration decreases hormone-induced adult sexual behavior in mice when administered during puberty, but not when it is …
Investigation Of Fungicide Resistance Mechanisms And Dynamics Of The Multiple Fungicide Resistant Population In Sclerotinia Homoeocarpa, Hyunkyu Sang
Doctoral Dissertations
A filamentous ascomycete fungus Sclerotinia homoeocarpa causes dollar spot, which is the most important disease of turfgrasses in the United States. Despite the increased number of reports of site-specific fungicide resistance and a recent report of multidrug resistance (MDR) in S. homoeocarpa field populations, the genetic mechanisms behind resistance or reduced sensitivity to fungicides remain poorly explained in the fungus. In order to prevent further development of fungicide resistance in the dollar spot pathosystem, a detailed elucidation of mechanisms of site-specific fungicide resistance and MDR is needed. In addition, the previous studies of MDR in fungi mostly focused on efflux …
The Effects Of Predictability On Stereotypic Behavior In Nonclinical Adult Humans (Homo Sapiens) And Rhesus Macaques (Macaca Mulatta), Amy Ryan
Doctoral Dissertations
Stereotypies, or repetitive and purposeless behaviors, are observed in both humans and other animals. They have been primarily studied in captive animal and clinical human populations with comparably little research devoted to understanding less severe levels of stereotypies observed in nonclinical populations of adult humans and in most captive animals. As these behaviors are sometimes associated with routine events, I explored the relationship between the predictability of anticipated events and mild stereotypies. I studied this relationship in captive rhesus macaques and a novel comparison group of adult humans from a nonclinical population. I designed two experimental paradigms, a wait paradigm …
Potential Enhancement Of Dietary Isothiocyanates Combination On Biological Activities, Kanyasiri Rakariyatham
Potential Enhancement Of Dietary Isothiocyanates Combination On Biological Activities, Kanyasiri Rakariyatham
Doctoral Dissertations
Isothiocyanates (ITCs) such as allyl isothiocyanate (AIT) and sulforaphane (SFN) are well-known bioactives with wide range of beneficial properties, which may be consumed simultaneously through diets containing cruciferous vegetables. However, biological activities of ITCs in combinations had not been well defined. The present study evaluated the potential efficacy of AIT, SFN and their combinations on three important biological properties: anticancer, anti-inflammation and antioxidant. Our results showed that the combination between AIT and SFN led to a stronger growth inhibition on A549 non-small cell lung cancer cells than treatments with the individual compounds. The enhanced effect was proved to be synergistic …