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Articles 1 - 30 of 385
Full-Text Articles in Life Sciences
Consistency Is Key: Investigating Vocal Consistency In Field Sparrows, Stephanie Stanton
Consistency Is Key: Investigating Vocal Consistency In Field Sparrows, Stephanie Stanton
Masters Theses
No abstract provided.
Influence Of Soil And Land Cover On Chronic Wasting Disease Prevalence In White-Tailed Deer And Mule Deer Across North America, Madison L. Miller
Influence Of Soil And Land Cover On Chronic Wasting Disease Prevalence In White-Tailed Deer And Mule Deer Across North America, Madison L. Miller
Masters Theses
Chronic wasting disease (CWD) is a fatal neurodegenerative disease that infects deer and is caused by a pathogenic prion. CWD is a concerning wildlife disease because it is incurable, potentially poses a risk to human health, and is spreading rapidly. CWD prions are transmitted both directly via bodily fluids and indirectly through environmental reservoirs such as soil. In this study, we investigated the influence of land cover and soil characteristics on CWD prevalence in white-tailed deer and mule deer. We acquired CWD prevalence data from seven North American regions and used ArcGIS to obtain land cover and soil characteristic data …
The Flavoprotein Rcla Is A Hypothiocyanous Acid Reductase, Irina Chapman
The Flavoprotein Rcla Is A Hypothiocyanous Acid Reductase, Irina Chapman
Masters Theses
Reactive chlorine species (RCS) - hypochlorous acid (HOCl), hypothiocyanous acid (HOSCN), and chloramines - are powerful antimicrobial oxidants generated by the innate immune system. Bacteria developed defense mechanisms against RCS, which are highly toxic for invading pathogens. One such defense system involves RclA, an enzyme from the flavin disulfide reductase family, which is massively upregulated upon exposure of Escherichia coli to RCS. Recent research suggests that RclA functions as a Cu(II) reductase to provide resistance against RCS. However, the exact mechanism used by RclA was subject to debate. In this study, we demonstrate that RclA is unlikely to function as …
Retinal Regeneration In A Genetic Mouse Model Of Glaucoma, Joshua Paris
Retinal Regeneration In A Genetic Mouse Model Of Glaucoma, Joshua Paris
Masters Theses
Glaucoma is a degenerative retinal disease characterized by progressive loss of retinal ganglion cells (RGCs). Previous studies have shown that application of a specific α7 nicotinic acetylcholine receptor agonist, PNU-282987 (PNU), onto the murine retina induces neurogenesis of numerous retinal cell types, including RGCs. The aim of this study is to characterize the short-term and long-term effects of PNU in a glaucoma model. The effects of PNU were analyzed in a DBA/2J mouse model that auto-induces a glaucoma-like condition in adulthood. These mice manifest an elevated intraocular pressure (IOP) starting at 6 months, followed by loss of RGCs. To assess …
Effects Of Traditional And Microbially-Focused Restoration Techniques On Soil Communities In Tallgrass Prairies, Zachary J. Whitacre
Effects Of Traditional And Microbially-Focused Restoration Techniques On Soil Communities In Tallgrass Prairies, Zachary J. Whitacre
Masters Theses
Tallgrass prairies have virtually disappeared in many parts of their former range due to the conversion of this ecosystem to farmland. In more recent years there have been efforts to restore these prairies on reclaimed agricultural land. However, these restored prairies do not resemble their remnant counterparts in many ways, such as in soil microbial community composition and metrics related to carbon storage. In Chapter 1, I show that bacterial communities in a restored prairie and an adjacent remnant prairie in southwest Michigan differ in their immediate and longer-term responses to prescribed fire, a commonly used prairie restoration and maintenance …
Strong Women Breaking Ground: Roles Of Women In Agriculture In Michigan, April L. Shirey
Strong Women Breaking Ground: Roles Of Women In Agriculture In Michigan, April L. Shirey
Masters Theses
Agriculture in Michigan is changing. While the number of farms and farmers continue to decrease, women are increasingly taking on the role of farmer instead of the “farmer’s wife”. The number of female producers increased from 8,275 to 26,059 where the number of producers in Michigan decreased from 56,014 to 47,641 from 2007 to 2017 (USDA, 2007, 2017). Women are becoming the face of farming in Michigan, yet little research examines the impacts of these shifts. In this research, I conduct semi-structured interviews with female farmers throughout lower Michigan beginning in the summer of 2020 to learn more about these …
Evaluation Of Α-Pyrrolidindovalerophenone (Α-Pvp) And Its Isomers In Male And Female Sprague-Dawley Rats Trained To Discriminate Mdpv, Kaley Cargile
Evaluation Of Α-Pyrrolidindovalerophenone (Α-Pvp) And Its Isomers In Male And Female Sprague-Dawley Rats Trained To Discriminate Mdpv, Kaley Cargile
Masters Theses
Recreational use of synthetic cathinones, 3,4-methylenedioxypyrovalerone (MDPV) and α‐pyrrolidinovalerophenone (α‐PVP), has become increasingly popular, thus prompting characterization of their behavioral and neurochemical effects. MDPV has been studied for several years now, though there is still much unknown about α‐PVP, and its isomers. The primary objective of this study was to characterize the discriminative effects of α‐PVP and its isomers in comparison to MDPV. Male and female Sprague-Dawley rats were trained to discriminate 0.5mg/kg MDPV from saline injections under a fixed ratio 20 (FR 20) schedule of food reinforcement. Substitution tests were conducted with MDPV (0.05-0.5mg/kg), α‐PVP (0.05-0.5mg/kg), (S)-α‐PVP (0.05-1mg/kg) and …
Changes In Gene Expression Profiles In Müller Glia Following Exposure To An Α7 Nicotinic Acetylcholine Receptor Agonist, Megan L. Stanchfield
Changes In Gene Expression Profiles In Müller Glia Following Exposure To An Α7 Nicotinic Acetylcholine Receptor Agonist, Megan L. Stanchfield
Masters Theses
Previous studies from this lab have determined that dedifferentiation of Müller glia (MG) occurs after application of an α7 nicotinic acetylcholine receptor agonist, PNU-282987 (PNU), to retinal pigment epithelial (RPE) cells in adult rodents. This study was designed to explore the role of the HB-EGF/Ascl1/Lin28a signaling pathway in MG dedifferentiation to retinal progenitor cells. RNAseq was performed on MG following contact with RPE-J cells treated with PNU-282987. Up- or down-regulated genes were compared with published literature of MG dedifferentiation that occurs in lower vertebrate regeneration or with transcript profiles during early mammalian development. Between 8-12 hours, up-regulation was observed in …
Putative Flagellar Channel-Lining Residues And Their Role In Filament Synthesis, Morphology And Stability, Troy Burtchett
Putative Flagellar Channel-Lining Residues And Their Role In Filament Synthesis, Morphology And Stability, Troy Burtchett
Masters Theses
Bacterial flagella are comprised of ~20,000 repeating subunits called flagellin and are synthesized by transporting unfolded flagellin monomers through the central channel of the flagellar filament to the distal end where they are folded and incorporated into the growing structure. The transport mechanism is predicted to be facilitated by a hydrophilic coating of amino acid side chains on the inside wall of the central channel that repels the mostly hydrophobic surface of the unfolded flagellin monomer. The lack of interaction between the flagellin monomer and the central channel wall is thought to allow for the passive diffusion of protein monomers. …
Evaluation Of Autoreactivity In Vh4-34-Containing Antibodies From Human B-1 Vs B-2 Cells, Michelle E. Ray
Evaluation Of Autoreactivity In Vh4-34-Containing Antibodies From Human B-1 Vs B-2 Cells, Michelle E. Ray
Masters Theses
B-1 cells are a unique population of lymphocytes, with distinct phenotypic and functional characteristics in comparison to conventional B-2 cells. B-1 cells are thought to be more closely related to the innate immune system than the adaptive, and B-1 cells constitutively secrete antibody that is recognized as broadly reactive with low levels of autoreactivity. The antibody heavy chain segment, VH4-34, is overutilized by the human B-1 cell population. VH4-34 antibodies are associated with autoreactivity, although not all VH4-34 antibodies are autoreactive. The primary objective of this study was to determine whether autoreactive forms of VH4-34 antibodies are localized only to …
Exploring Song As A Reproductive Isolation Mechanism In A Hybridizing Population Of Winged Warblers, Amy E. Janik
Exploring Song As A Reproductive Isolation Mechanism In A Hybridizing Population Of Winged Warblers, Amy E. Janik
Masters Theses
Reproductive isolation mechanisms such as song are used by birds to promote assortative mating by species and prevent gene flow when closely related species come into secondary contact. Based on the strength of a reproductive barrier, signals in hybrid zones can diverge and become more dissimilar to maintain species or converge to become more similar and make species discrimination more difficult. When two closely related species overlap in territories and have similar songs, song convergence is likely and has the capacity to disrupt species recognition. We test the hypothesis that song acts as a reproductive isolation mechanism by examining song …
Cellulose Based Separator For High-Performance Lithium-Ion Batteries, Akshit Vaidya
Cellulose Based Separator For High-Performance Lithium-Ion Batteries, Akshit Vaidya
Masters Theses
During the past two decades, lithium-ion batteries (LIBs) have gained great success in the field of portable devices, and currently, are penetrating to the market of vehicles. Compared to the fast development of LIBs, little efforts have been dedicated to the separator, which is one of the most important components of LIBs. Primarily, the lithium-ion battery separator has two functions, one is to prevent direct contact between the positive and negative electrodes, and the other is to provide a path for effective ionic transportation. Currently, the separator market of LIBs is dominated by polyolefin materials such as polypropylene, polyethylene, and …
Agritourism Development In Southwest Michigan: Motivations Of Agritourists And Operators, Esther Akoto Amoako
Agritourism Development In Southwest Michigan: Motivations Of Agritourists And Operators, Esther Akoto Amoako
Masters Theses
National agricultural statistics show that the number of agritourism farms and the proportion of agritourism related revenues in the United States has steadily increased during the last ten years, especially among small family farms. The recent growth in agritourism is both demand - and supply-driven. However, there are limited studies that explore agritourism motivations from both the visitors' and operators’ perspectives. This study examines what the agritourists' and operators’ motivations are and the challenges facing the industry to provide information for those currently involved and those wanting to include agritourism in their operations. Online and in-person surveys and unstructured interviews …
Supporting Black Mothers At The Transition: A Collaborative Design Prenatal Coparenting Program, Jordan Ebanaya
Supporting Black Mothers At The Transition: A Collaborative Design Prenatal Coparenting Program, Jordan Ebanaya
Masters Theses
Despite having the highest infant mortality rate of similarly developed nations, infant mortality rates have trended downward in the United States, however, the infant mortality disparity between Black and White infants persists. The causes of the disparity have been traced to social considerations of the mother especially while pregnant. These social situations include racism and discrimination, marital status of the mother, social support and pregnancy intentions, pointing to one commonality: stress. Using Boss and colleagues 2017 Conceptual Model of Family Stress, this study proposes a solution to address some of the social support, or resources, available to the expectant mother; …
Pcr Analysis On The Effects Of Alpha Synuclein Treatment On C6 Rat Glioma Cells, Michael John Helmus
Pcr Analysis On The Effects Of Alpha Synuclein Treatment On C6 Rat Glioma Cells, Michael John Helmus
Masters Theses
Multiple System Atrophy (MSA) is a rare neurological disease that mainly implicates the neuronal protein, alpha synuclein, as being centrally involved in MSA pathology. Despite synucleinopathy dogma, little is known about alpha synucleins role in MSA pathogenesis. The Ide laboratory previously conducted an Affymetrix gene expression study utilizing the post-mortem pons tissue from eight individuals with MSA and five individuals without any known neurological disorders. One conclusion from that study was that downregulation of numerous mitochondrial homeostasis related genes had occurred. It is hypothesized that alpha synuclein can perturb mitochondrial homeostasis through direct interaction with mitochondria. This study utilized Reverse …
Functional Analysis In The Home Setting Of An Older Adult With Neurocognitive Disorder, Emily Norton
Functional Analysis In The Home Setting Of An Older Adult With Neurocognitive Disorder, Emily Norton
Masters Theses
Currently within the behavioral gerontology literature there are no published studies that include a functional assessment in the home setting. The primary goal of the present study was to address this gap by conducting a functional analysis on a challenging behavior of an older adult with neurocognitive disorder in the home. This study occurred in two phases. During phase one, researchers conducted an antecedent functional analysis on the bizarre speech of an 81-year-old female with suspected dementia across four conditions (television on, no interactions initiated; television on, interactions initiated; television off, no interactions initiated; television off, interactions initiated). Results from …
Postactivation Potentiation Effects From Maximal Isometric Contractions Performed At Different Hip Joint Angles, Kyle Derosia
Postactivation Potentiation Effects From Maximal Isometric Contractions Performed At Different Hip Joint Angles, Kyle Derosia
Masters Theses
The purpose of this study was to investigate the differences in vertical ground reaction force (VGRF) production and myoelectric activity after performing maximal isometric contractions at different hip joint angles. 10 healthy, experienced participants reported to the lab on two separate occasions where they performed 3 power cleans at baseline, then 4 maximal isometric deadlifts at either ~50° hip flexion angle (Max) or ~90° hip flexion angle (Min). Following the isometric deadlifts, another 3 power clean trials at 70% 1 repetition maximum were performed and used as a post-test. The isometric deadlifts served as the conditioning contraction (CC) to induce …
Effect Of Caffeine Supplementation On Vertical Jump Performance, Heart Rate Variability, And Electromyography, Collin T. Garner
Effect Of Caffeine Supplementation On Vertical Jump Performance, Heart Rate Variability, And Electromyography, Collin T. Garner
Masters Theses
Research into caffeine’s ability to improve anaerobic performance is inconclusive. Eleven anaerobically trained individuals (mean age: 23.45 ± 1.51 years) participated in this study. Assessments of resting heart rate variability (HRV), exercise heart rate variability, surface electromyography (sEMG), static vertical jump (SJ), and countermovement vertical jump (CMJ) were conducted before and after administration of placebo and caffeinated treatments. Three trials of each vertical jump technique were performed before and after treatment administration. A 60-minute absorption period was utilized for absorption of the treatment following its ingestion. All participants performed testing on two separate occasions, once under the placebo condition and …
Relationship Between One Repetition Maximum Parallel Squat And Jump Squat Peak Power, Corey Klitzke
Relationship Between One Repetition Maximum Parallel Squat And Jump Squat Peak Power, Corey Klitzke
Masters Theses
Jump squats are a simple exercise that can be used to train lower body power. Unlike many other methods of power training, jump squats do not require any specialized equipment (platforms, bumper plates, etc.). Jump squats can be used when other forms of power training are not available or are not allowed. In order to most efficiently train power, the intensity must balance force and velocity. The purpose of this study was to find the intensity that yields the peak power output of a jump squat. 12 participants (9 males, 3 female) participated in the study. Each participant completed a …
Astrogliosis In The Adult Zebrafish Olfactory Bulb During Repetitive Peripheral Damage, Jackson Scheib
Astrogliosis In The Adult Zebrafish Olfactory Bulb During Repetitive Peripheral Damage, Jackson Scheib
Masters Theses
Traumatic brain injuries (TBIs), particularly if repetitive, cause massive disruptions of brain homeostasis, significant loss of neurons, and may result in death. Astrocytes are a type of cell that maintain brain homeostasis and neuronal health. Astrogliosis is a continuum of morphological and functional changes of astrocytes in response to damage. This can be neuroprotective or neurotoxic depending on the severity and type of injury. Global astrocyte scarring is typical of neurotoxic astrogliosis and is the source of secondary injury after TBIs. The adult zebrafish olfactory system is known for its capacity to recover from trauma, however, astrocytes in this system …
Soy- Based Flexographic Ink For Linerboard Printing, Rahul Ramchandra Pingale
Soy- Based Flexographic Ink For Linerboard Printing, Rahul Ramchandra Pingale
Masters Theses
Many printing inks use volatile solvents in the formulation, which are hazardous to the environment from emission of VOC’s and at the same time, synthetic resins in these inks are not biodegradable. These problems with the fluctuating and rising price of petroleum are main reasons to look for new resources for making more environmentally friendly printing inks. The majority of the commercially available water based inks are formulated based on using acrylic resins, synthetic colorants, solvents/water and additives, which are the common main components for formulating printing inks. In this research, soy proteins were tested for their suitability to partially …
Plant U-Box Proteins 25 And 26 Are Involved In Regulation Of Crosstalk Between Salicylate And Jasmonate Signaling Pathways, Dustin C. Rowland
Plant U-Box Proteins 25 And 26 Are Involved In Regulation Of Crosstalk Between Salicylate And Jasmonate Signaling Pathways, Dustin C. Rowland
Masters Theses
The jasmonic (JA) and salicylic acid (SA) signaling systems regulate diverse plant developmental processes and immune responses. Due to the opposite end-goals of various pathogen-response pathways, a certain level of antagonism between the JA and SA pathways is required. However, over-suppression of any single pathway would leave a plant susceptible to invasion by a specific class of pathogen. We investigate the regulation of crosstalk between the JA- and SA-mediated immune pathways and how the dilemma of specific susceptibility may be avoided. Manipulation of Arabidopsis thaliana genotypes was utilized to determine the effects of protein knockout on pathogen-specific susceptibility and resistance. …
Effects Of Instability On Core Muscle Activation In A Side Bridge, Erin E. Kishman
Effects Of Instability On Core Muscle Activation In A Side Bridge, Erin E. Kishman
Masters Theses
Training the musculature of the core continues to be perceived as an essential component of conditioning and rehabilitation settings (11). A popular way to train the core is with the use of instability devices, such as Swiss ball or suspension trainer. However, there is limited research on the effects of these devices on core muscle activity. The purpose of this study was to examine core muscle activity during side bridge variations with and without instability devices (Floor, Swiss Ball, and TRX) through electromyography (EMG) of the rectus abdominis, external oblique, erector spinae, and latissimus dorsi. 39 participants performed three variations …
Characterization Of Pinitol Catabolism In Sinorhizobium Meliloti And Its Role In Nodule Occupancy, Angela Irene Kennedy-Mendez
Characterization Of Pinitol Catabolism In Sinorhizobium Meliloti And Its Role In Nodule Occupancy, Angela Irene Kennedy-Mendez
Masters Theses
Sinorhizobium meliloti, which is the nitrogen fixing symbiont of Medicago sativa (alfalfa), was used to test the hypothesis that D-chiro-inositol is an intermediate of pinitol catabolism and that pinitol catabolism plays a role in S. melilot s ability to compete for nodule occupancy. An analytical method, involving gas chromatography and mass spectrometry (GCMS), was developed to detect and separate pinitol and D-chiro-inositol. The S. meliloti wild type, and three isogenic mutant strains (idhA, mocD, and mocE) were grown in minimal medium with pinitol and pinitol plus glycerol. The S. meliloti wild type can utilize pinitol as a sole carbon source, …
Spectral Discrimination Of Phragmites Australis At Different Phenological Stages In Saginaw Bay, Michigan, Trenton Benedict
Spectral Discrimination Of Phragmites Australis At Different Phenological Stages In Saginaw Bay, Michigan, Trenton Benedict
Masters Theses
Michigan Great Lakes wetlands are among Michigan’s most significant bio-diversified ecosystems. One threat to this ecosystem is invasive species. Phragmites australis is one of these invasive species creating problems in the wetlands. Identifying Phragmites through satellite imagery creates difficulties in discriminating Phragmites from other vegetation accurately. This study used an ASD HandHeld 2 field spectroradiometer to identify the phenological spectral properties between Phragmites and cattails. The Euclidean distance was analyzed the spectral curves from the spectroradiometer to determine the separability between Phragmites and cattails. The largest Euclidean distance determined the best month to separate the spectral signatures of Phragmites and …
Papermaking Factors Affecting Lateral Web Position During Commercial Heat Set Web Offset Printing, George W. Shields
Papermaking Factors Affecting Lateral Web Position During Commercial Heat Set Web Offset Printing, George W. Shields
Masters Theses
The interaction of water with paper plays a role in web handling characteristics during commercial heat set web offset printing. Water absorption leads to lower web tension for a given strain.
This research investigates paper properties and their role in preventing lateral web movement from cross machine air flows in the drying section during normal printing operations. Tensile properties of sheets are measured at various moisture contents and then used to determine the equilibrium stress-strain relationship for papers at moisture contents typical of heat set web offset printing. Permeability, fiber orientation and tensile stiffness are evaluated against lateral web movement …
Defining The Immune Response And Cellular Pathologies In Multiple System Atrophy, Annamarie Valenti
Defining The Immune Response And Cellular Pathologies In Multiple System Atrophy, Annamarie Valenti
Masters Theses
Multiple System Atrophy (MSA) is a neurodegenerative disease characterized by the accumulation of misfolded α-synuclein (α-Syn) in oligodendrocytes of the central nervous system (CNS). A previous study in our lab used Affymetrix DNA microarray analysis to show the downregulation of various mitochondrial related genes, as well as the upregulation of genes involved in inflammatory/immune responses in MSA brain tissue. Therefore, it is hypothesized that an increased presence of immune proteins exists in the MSA brain accompanied by glial cell pathology including decreases in cell metabolism and cell viability. This study uses immunohistochemistry (IHC) to show the increased presence of CD68 …
The Role Of Calcium In Regulation Of Glial Cell Line Derived Neurotrophic Factor By Skeletal Muscle Cells, Alicia M. Boynton
The Role Of Calcium In Regulation Of Glial Cell Line Derived Neurotrophic Factor By Skeletal Muscle Cells, Alicia M. Boynton
Masters Theses
Glial cell line-derived neurotrophic factor (GDNF) is an important signaling molecule for the somatic motor nervous system. GDNF protein is produced and secreted by skeletal muscle cells and helps maintain motor neuron innervation at the neuromuscular junction. Treatment with exogenous GDNF prevents denervation which is characteristic of aging and neurodegenerative disease. The therapeutic potential of GDNF cannot be fully explored without understanding the mechanisms by which GDNF protein production is regulated. The primary objective of this study was to determine the role of calcium in regulating GDNF protein expression by skeletal muscle cells. Skeletal muscle cells (C2C12) were grown in …
Physiology And Genetics Shape The Microbiome Of A Seabird Species (Oceanodroma Leucorhoa) More Than Environmental And Social Factors, Douglas Steven Pearce
Physiology And Genetics Shape The Microbiome Of A Seabird Species (Oceanodroma Leucorhoa) More Than Environmental And Social Factors, Douglas Steven Pearce
Masters Theses
The microbiome provides multiple benefits to animal hosts that can profoundly impact health and behavior. Microbiomes are well-characterized in humans and animals in controlled settings, yet assessments of wild bird microbial communities remain vastly understudied. This study examines the multiple factors that affect the microbiome of a burrow-nesting Procellariiform bird species, Leach’s storm-petrel. 16S rRNA-based Illumina Mi-Seq analyses are used to assess the composition and structure of bird and burrow-associated bacterial communities. Results indicate that sex and skin site contribute to bird-associated bacterial community variation, and MHC heterozygosity impacts these bacterial assemblages in a sex and site-specific manner, potentially having …
The Application Of Chitosan On An Experimental Infection Of Pseudogymnoascus Destructans Increases Survival In Little Brown Bats, Torin C. Kulhanek
The Application Of Chitosan On An Experimental Infection Of Pseudogymnoascus Destructans Increases Survival In Little Brown Bats, Torin C. Kulhanek
Masters Theses
This research builds upon a previous study conducted that tested the efficacy of chitosan on experimentally-infected bats as a laboratory model of White-nose syndrome. White-nose syndrome is a fungal infection caused by Pseudogymnoascus destructans, formerly known as Geomyces destructans. The pathology of this disease is not yet fully understood, but it is devastating bats throughout Northeastern America and continues to spread. Here we tested multiple application time points and concentrations of chitosan on the wings of experimentally-infected bats and compared them with the controls. We grossly viewed the wings first to get a sense of the amount of …