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Articles 181 - 198 of 198
Full-Text Articles in Neuroscience and Neurobiology
Enzyme Analysis Of Oxidatively Modified Proteins Post-Tbi, Brittany Rice
Enzyme Analysis Of Oxidatively Modified Proteins Post-Tbi, Brittany Rice
Online Theses and Dissertations
The brain is one of the most important organs in the body. It functions as a control center by regulating and coordinating actions and reactions, which is facilitated via signal transduction pathways. Its function is primarily dependent upon sufficient supply of glucose for energy metabolism. The dysfunction of the brain resulting from an external force is known as traumatic brain injury (TBI). Symptoms range from physical to psychological and effects can be mild, moderate, or severe depending on the extent of injury. TBI is associated with oxidative damage, the overproduction of reactive oxygen/nitrogen species. Reduced energy metabolism is a consequence …
Sk Channel Clustering In Sod1-G93a Motoneurons, Saihari Shekar Dukkipati
Sk Channel Clustering In Sod1-G93a Motoneurons, Saihari Shekar Dukkipati
Browse all Theses and Dissertations
Amyotrophic lateral sclerosis (ALS) is a devastating neuromuscular disease that currently has no cure and extremely limited treatment options. The specific mechanisms that underlie motoneuron degeneration and death, which are classical features of this disease, are mostly unknown. This thesis tests the hypothesis that small-conductance calcium-activated potassium channels (SK) may be downregulated in ALS motoneurons, as suggested by computational modelling. SK channel expression was measured in spinal alpha-motoneuron cell bodies or somata of wildtype (WT) and mutant (mt) SOD1-G93A mice, a transgenic animal model of ALS. Quantitative immunohistochemical analysis of the developmental expression of SK channel isoforms SK2 and SK3 …
Ultrasonic Vocalizations As A Predictor Of Resilience To Intermittent Swim Stress-Induced Anxiety: An Investigation Of Re-Exposure Effects, Yandan Wang, Robert C. Drugan, Nathaniel Stafford
Ultrasonic Vocalizations As A Predictor Of Resilience To Intermittent Swim Stress-Induced Anxiety: An Investigation Of Re-Exposure Effects, Yandan Wang, Robert C. Drugan, Nathaniel Stafford
Honors Theses and Capstones
No abstract provided.
Adams As Potential Regulators Of Stem Cell Quiescence In The Olfactory Epithelium, Elaine Elizabeth Orendorff
Adams As Potential Regulators Of Stem Cell Quiescence In The Olfactory Epithelium, Elaine Elizabeth Orendorff
Master's Theses
I demonstrate that a member of the protein family A Disintegrin and Metalloprotease (ADAM), ADAM23, is expressed in the olfactory epithelium (OE) and may inhibit neural progenitor cell (NPC) proliferation. I generated a list of ten gene candidates and selected ADAM23 for further study, based on its conserved protein structure and accumulating evidence for its role in cell cycle progression of proliferative cells. I next determined ADAM23 protein localization using immunohistochemistry and measured both mRNA and protein expression post-lesion with RT-qPCR and Western blot. ADAM23 is expressed in multiple cell types of the OE, including glial Sustentacular (Sus) cells and …
Assessing The Expression Of Astrocytic Markers In Retinal Ganglion Cell Projection Of Lcr/Hcr Rats, Isabella K. Bartholomew, Samuel Crish, James Holda, Jordan Renna, Gina Wilson
Assessing The Expression Of Astrocytic Markers In Retinal Ganglion Cell Projection Of Lcr/Hcr Rats, Isabella K. Bartholomew, Samuel Crish, James Holda, Jordan Renna, Gina Wilson
Williams Honors College, Honors Research Projects
Metabolic Syndrome is a human condition that presents with various metabolic issues such as abnormal distribution of body fat, high blood pressure, and a prothrombotic state, among other problems (Alberti,et al, 2005). This syndrome is a risk factor for visual disorders, such as glaucoma, and is often associated with increased levels of neuroinflammation. Currently, the animal model used to replicate this syndrome is The Low Capacity Runner and High Capacity Runner Rat Model. These rats have been bred based on their running capacities for 30+ generations to have drastic metabolic differences. We assessed key areas of the retinal ganglion cell …
Echoes, Sarah Abigail Adleman
Echoes, Sarah Abigail Adleman
Open Access Theses & Dissertations
When I was sixteen, my mother was killed one evening while running on the bayou behind our house in Houston. The man, who is now on Death Row in Texas, beat, raped, and then strangled her to death. Writer Mary Cappello says of Creative Nonfiction, to compose discursively requires that we turn in the direction of the discourses that have made us who we are rather than start from a place of what we think happened to us in the course of our lives. She goes on further to say, Creative nonfiction appreciates the power of prepositions. Instead of writing …
Age-Related Hearing Loss: Inhibition--Excitation Balance In The Rat Inferior Colliculus, Sydney Cason 16
Age-Related Hearing Loss: Inhibition--Excitation Balance In The Rat Inferior Colliculus, Sydney Cason 16
Honor Scholar Theses
Aging is an increasingly important research topic due to the aging populations in the United States and other developed countries. One aspect of aging, age-related hearing loss, is caused by changes in the peripheral and the central auditory systems. The age-related changes in the central auditory system, including the integrating midbrain area inferior colliculus (IC), are not well understood. Studies have revealed that GABA levels in the IC decrease with age. However, no studies have quantified the age-related changes in IC glutamate levels or the relationship between GABA and glutamate levels in the aging IC. This study aimed to elucidate …
Sensing And Mapping Of Surface Hydrophobicity Of Proteins By Fluorescent Probes, Nethaniah Dorh
Sensing And Mapping Of Surface Hydrophobicity Of Proteins By Fluorescent Probes, Nethaniah Dorh
Dissertations, Master's Theses and Master's Reports
Surface hydrophobic interactions in proteins play a critical role in molecular recognition, influence biological functions, and play a central role in many protein misfolding diseases. As significance of surface hydrophobic interactions in age-related proteinopathies is becoming clear; it has led to an increased demand for better probes and tools to sense and characterize protein surface hydrophobicity. Current commercially available fluorescent probes such as 8-anilino-1-naphthalene sulfonic acid (ANS), 4,4′ -dianilino-1,1′-binaphthyl-5,5′-disulfonic acid (Bis-ANS), 6-propionyl-2-(N,N-dimethylamino)naphthalene (PRODAN), tetraphenylethene derivative, and Nile Red can sense proteins average hydrophobicity. However, probe limitations prevents their application for measuring the protein surface hydrophobicity. Some of the major deficiencies …
Scalar Short-Term Memory, Tyler D. Bancroft
Scalar Short-Term Memory, Tyler D. Bancroft
Theses and Dissertations (Comprehensive)
The location of the brain’s working and short-term memory (WM/STM) “system” is unclear. The existence of a dedicated WM/STM system is itself under debate. Recently, it has been proposed that WM/STM storage relies not on a dedicated system in prefrontal cortex, but rather that it is an emergent function of interaction between attentional and representational systems (e.g., sensory cortex) in the brain. However, mnemonic representations of very simple stimuli have repeatedly been shown to exist in frontal cortex. In this manuscript, I use computational and behavioural methods to demonstrate similarities between the representations of different types of very simple stimuli …
The Role Of Matrix Metalloproteinase 9 And Osteopontin In Synaptogenesis And Reinnervation Of The Olfactory Bulb Following Brain Injury, Melissa A. Powell
The Role Of Matrix Metalloproteinase 9 And Osteopontin In Synaptogenesis And Reinnervation Of The Olfactory Bulb Following Brain Injury, Melissa A. Powell
Theses and Dissertations
Traumatic brain injury (TBI) is a serious health concern, causing cognitive, motor, and sensory deficits, including olfactory dysfunction. This dissertation explores the effects of TBI on synaptic plasticity within the olfactory system, seeking to define mechanisms guiding postinjury sensory reinnervation. Physical forces induced by TBI can axotomize olfactory receptor neurons (ORNs), which innervate olfactory bulb (OB). These axons regenerate OB projections after injury, a process involving growth through a complex extracellular matrix (ECM). As such, we investigated a potential molecular mechanism capable of modifying local OB ECM to support postinjury synaptogenesis. Since matrix metalloproteinases (MMPs) and their ECM substrates are …
Allosteric Effects Of G-Protein Coupled Receptor Heteromerization: Relevance To Psychosis, Jason W. Younkin
Allosteric Effects Of G-Protein Coupled Receptor Heteromerization: Relevance To Psychosis, Jason W. Younkin
Theses and Dissertations
G-protein coupled receptors (GPCRs) implicated in disease are the predominant pharmaceutical targets. Growing evidence suggests that GPCRs form homo- and heteromeric complexes, resulting in allosteric functional changes. Ligands targeting one receptor can alter the function of the other receptor or receptors. Knowledge of these functional changes will provide unique opportunities to treat diseases. We examined two GPCR heteromers implicated in psychosis: mGlu2R-5HT2AR and D2R-5HT2AR. Using whole-cell patch clamp, we studied HEK-293 cells stably transfected with mGlu2R and 5HT2AR. Maximal heteromer formation allows inverse agonists to increase the G-protein activity of the opposite receptor, while sub-maximal heteromer formation does not. However, …
The Effect Of Depth On Development And Sexual Dimorphism Of The Sonic System In Deep Sea Neobythitine Fishes: The Upper Continental Slope, Heba Ali
Theses and Dissertations
Abstract
Background: Cusk-eels from the subfamily Neobythiitinae are one of the major groups of sound-producing fishes on the continental slope. Sounds have never been recorded from a member of this subfamily, and sonic anatomy is considered a proxy for sound production. As the first part of a study on the effects of depth on sonic anatomy, we examined three relatively shallow species from the upper continental slope.
Methods: Three species (Hoplobrotula armata, Neobythites longipes and Neobythites unimaculatus) were examined for sonic anatomy (skeleton, swimbladder and sonic muscles), and sonic and epaxial muscle fibers were measured for diameter. …
Acute And Chronic Effects Of Inhalants In Intracranial Self-Stimulation, Matthew Tracy
Acute And Chronic Effects Of Inhalants In Intracranial Self-Stimulation, Matthew Tracy
Theses and Dissertations
Inhalants are a loosely defined diverse group of volatile substances which people abuse. Despite widespread misuse of inhalants, there are limited preclinical methods available to study the reinforcement-like properties of inhalants. One procedure which has demonstrated substantial promise as a tool to investigate inhalant pharmacology is the intracranial self-stimulation (ICSS) procedure. ICSS utilizes pulses of electrical stimulation to the mesolimbic reward pathway to serve as a temporally defined and controlled operant reinforcer with a highly adjustable efficacy. The first aim of the project was to characterize the effects of commonly abused inhalants: including toluene, trichloroethane, nitrous oxide, isoflurane and R134a …
A Neural Circuit Of Appetite Control In C. Elegans, Kristen C. Davis
A Neural Circuit Of Appetite Control In C. Elegans, Kristen C. Davis
Theses and Dissertations
Feeding behavior and its associated neural circuitry is complex and intricate in mammalian systems, however, a simple model organism, such as C. elegans provides a more basic approach to understand factors and molecules involved. The fruit-dwelling nematode provides a unique set of resources; it only consists of 959 cells, 302 of which are neurons. In addition, each neuron’s connectivity and position within the worm is known and consistent between animals. Conservation of neurotransmitters and biochemical processes add to this impressive list. These resources provide an excellent background to address feeding behavior and the neural structures governing it.
Feeding behavior in …
Resolution Of Inflammation Rescues Axon Initial Segment Disruption, Nicholas M. George
Resolution Of Inflammation Rescues Axon Initial Segment Disruption, Nicholas M. George
Theses and Dissertations
Axonal domains are required for proper neuron function. These domains are unstable and degenerate concurrent with the inflammation in multiple sclerosis (MS) and the inflammatory disease models experimental autoimmune encephalomyelitis (EAE) and lipopolysaccharide (LPS) induced inflammation. Previous studies from our laboratory have shown that the axon initial segment (AIS) is maintained independently of the presence of myelin, but that AIS disruption is seen in MS as well as EAE and LPS-mediated inflammation. AIS loss can be interrupted in the early stage of EAE using the anti-inflammatory drug Didox. However, the potential for Didox directed repair of the AIS in later …
Does The Pain Of Rejection Promote The Pleasure Of Revenge? A Neural Investigation Of Cingulo-Striatal Contributions To Violence, David Chester
Does The Pain Of Rejection Promote The Pleasure Of Revenge? A Neural Investigation Of Cingulo-Striatal Contributions To Violence, David Chester
Theses and Dissertations--Psychology
Aggression is a dynamic and costly feature of human behavior. One reliable cause of aggression is social rejection, though the underlying mechanisms of this effect remain to be fully understood. Previous research has identified two psychological processes that are independently linked to aggressive retaliation: pain and pleasure. Given recent findings that pain magnifies the experience of pleasure, I predicted that the pain of rejection would promote the pleasure of aggression and thus, aggression itself. I also expected that this indirect effect of aggressive pleasure would only be observed among individuals with weaker self-regulatory abilities that are necessary to cope with …
The Role Of Oxidative Stress In The Mechanisms Of Ammonia-Induced Brain Swelling And Tolerance In The Goldfish (Carassius Auratus), David F. Jones Lisser Mr.
The Role Of Oxidative Stress In The Mechanisms Of Ammonia-Induced Brain Swelling And Tolerance In The Goldfish (Carassius Auratus), David F. Jones Lisser Mr.
Theses and Dissertations (Comprehensive)
Toxic build-ups of ammonia can cause potentially fatal brain swelling in mammals, but such swelling is reversible in the anoxia- and ammonia-tolerant goldfish (Carassius auratus). The mechanisms of ammonia-induced brain swelling and tolerance remain elusive, but several studies have suggested a role for reactive oxygen species (ROS), which may damage proteins and lipids in the plasma membrane of astrocytes in the brain. As a result, osmotic gradients across cell membranes may be altered leading to water uptake by astrocytes and swelling. While a role for ROS has been proposed in mammals, no studies have addressed this question in …
The Contribution Of The Cerebello-Thalamo-Cortical Circuit To The Pathology Of Non-Dopaminergic Responsive Parkinson's Disease Symptoms, Shannon C. Lefaivre
The Contribution Of The Cerebello-Thalamo-Cortical Circuit To The Pathology Of Non-Dopaminergic Responsive Parkinson's Disease Symptoms, Shannon C. Lefaivre
Theses and Dissertations (Comprehensive)
It has been well established that motor symptoms in Parkinson’s disease (PD) are primarily associated with dopaminergic degeneration in the basal ganglia. However, symptoms which respond poorly to dopaminergic replacement, such as tremor, gait, and balance deficits, point to an alternative pathology to dysfunction of the basal ganglia. Over-activity of the cerebellum has been demonstrated in PD, however it is not entirely clear how the cerebellum might be affecting motor symptoms. A lack of consensus exists regarding how cerebellar over-activity might be influencing PD tremor, and whether resting and postural tremor are differentially influenced by cerebellar dysfunction. It is also …