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Articles 1 - 29 of 29
Full-Text Articles in Biomedical Engineering and Bioengineering
Clinical Near-Infrared Spectroscopy Instrumentation: Postural Orthostatic Tachycardia Syndrome Studies, Parvathi Kadamati
Clinical Near-Infrared Spectroscopy Instrumentation: Postural Orthostatic Tachycardia Syndrome Studies, Parvathi Kadamati
Theses and Dissertations
ABSTRACT
CLINICAL NEAR-INFRARED SPECTROSCOPY INSTRUMENTATION: POSTURAL ORTHOSTATIC TACHYCARDIA SYNDROME STUDIES
by
Parvathi Kadamati
The University of Wisconsin-Milwaukee, 2017
Under the Supervision of Professor Mahsa Ranji
Aims: Postural orthostatic tachycardia syndrome (POTS) is a type of chronic orthostatic intolerance, annually affecting around 500,000 young Americans. Symptoms of POTS include lightheadedness and persistent increase in heart rate with upright body posture [1-3]. It requires a medical diagnosis. Impaired cerebral oxygenation of patients with POTS has been reported [4]. The pathophysiology remains unclear, and research is needed to understand the underlying conditions that lead to POTS. The aim of this research is to …
Impact Of Electrospun Conduit Composition And Peritoneal Pre-Conditioning On Patency And Remodeling Of Tissue Engineered Vascular Grafts, Mozhgan Shojaee
Impact Of Electrospun Conduit Composition And Peritoneal Pre-Conditioning On Patency And Remodeling Of Tissue Engineered Vascular Grafts, Mozhgan Shojaee
Theses and Dissertations
Overall goal of this project was to develop a tissue engineered vascular graft by implanting an electrospun tubular conduit into the peritoneal cavity to recruit autologous cells to it and provide the cells with the components of the hysiological environment prior to grafting the conduit into the artery. This was accomplished through three complimentary studies: finding the best ratio of poly(ε-caprolactone) (PCL) and collagen that improves inflammatory response within the peritoneal cavity; determining the effect of peritoneal pre-implantation and the amount of incorporated collagen on graft functionality; and reducing the potential side effect of peritoneal adhesion formation. In the first …
An Array Of Circular Dielectrophoresis Traps To Separate And Charaterize Individual Microparticles From Population, Hwangjae Lee
An Array Of Circular Dielectrophoresis Traps To Separate And Charaterize Individual Microparticles From Population, Hwangjae Lee
Theses and Dissertations
Dielectrophoretic traps have been broadly studied in light of their many advantages of high controllability, ease of operation, and high efficiency. In the previous studies, however, it was challenging to count captured particles or required work to capture particles. In the thesis, an array of circular dielectrophoresis (DEP) traps was developed and tested to manipulate population of microparticles in single particle level. The circular DEP traps enable more precise control of the force field than conventionally used interdigitated electrodes due to its omnidirectional and symmetric properties. The location of the captured microparticle inside the trap was confirmed by both of …
High Throughput Analysis Of The Penetration Of Iron Oxide/Polyethylene Glycol Nanoparticles Into Multicellular Breast Cancer Tumor Spheroids, Jonathan Robert Gabriel
High Throughput Analysis Of The Penetration Of Iron Oxide/Polyethylene Glycol Nanoparticles Into Multicellular Breast Cancer Tumor Spheroids, Jonathan Robert Gabriel
Theses and Dissertations
The purpose of this study was to design and optimize a system for the high-throughput analysis of multicellular tumor spheroids (MCTS), and validate the system through the study of a complex biological model. The system was successfully created and optimized, allowing the histological recovery of MCTS at rates up to 90% for microarrays of 24-spheroids. Arrays of 96-spheroids were recovered at rates up to 86%. The system was used to study the penetration of 5k Da-polyethylene coated superparamagnetic iron-oxide nanoparticles (5k-PEG SPIONs) into HTB-126 breast cancer spheroids cultured to a mean diameter of 486 micrometer (± 25.2 micrometer). Results were …
Effect Of Tannic Acid Crosslinking On The Mechanical Properties Of Collagen Scaffolds And Melanoma Cell Proliferation, Christopher J. Bridgeman
Effect Of Tannic Acid Crosslinking On The Mechanical Properties Of Collagen Scaffolds And Melanoma Cell Proliferation, Christopher J. Bridgeman
Theses and Dissertations
Metastatic melanoma is responsible for nearly 10,000 deaths in the United States each year. While the prognosis for patients with localized early stage melanoma cancer is good, the chances of survival for patients with late stage metastatic melanoma are only 16%. Matrix stiffness has been shown to have a profound effect on tumor metastasis for breast cancer, but little is known about its role on melanoma metastasis and progression. Similarly, the therapeutic effect of tannic acid (TA) has been extensively characterized for soft breast and leukemia cancers, but not for melanoma. The goal of the current study was to investigate …
Effects Of Passive And Active Training Paradigms On Bone And Muscle Recovery After Spinal Cord Injury, Brittany Lynn King
Effects Of Passive And Active Training Paradigms On Bone And Muscle Recovery After Spinal Cord Injury, Brittany Lynn King
Theses and Dissertations
The effects spinal cord injury (SCI) has have been studied in both human and animal models. Specifically in incomplete SCI, the bone degradation and muscle atrophy seen in the lower limbs has been documented, along with the effects of different training paradigms on bone and muscle loss. This study implemented a clinically relevant animal model of a moderate spinal contusion injury at the T9--T10 level, along with active body weight supported treadmill training (BWSTT) and passive bike training, to compare the effects such training methods have on the bone microstructure properties and muscle masses in the lower limbs of rats. …
A Battery-Operated Portable Standard Lead Ecg Monitor With Abnormal Heart Condition Detection System For Dogs, Zichen He
Theses and Dissertations
Long term monitoring the dog's heart condition is the best way to prevent being unable to treat the dog's heart failure in time when it occurs. Although, electro-cardio activity has been discovered by French scientist Mattencci in 1842, but there hasn't been any proper device developed so far for long term ECG (electrocardiogram) monitoring of cardiac dogs. Therefore, this paper has proposed an ECG monitor specially designed for dogs to fill this gap. The ECG monitor proposed is a 3-lead ECG monitoring system with diagnosis software that can detect heart failure, tachycardia, bradycardia, and arrhythmia according to dog's ECG signal. …
Effects Of Bioengineering Scaffolds Releasing Neurotrophins And Body Weight Supported Treadmill Training On H-Reflex After Spinal Cord Injury, Jaclyn Ann Witko
Effects Of Bioengineering Scaffolds Releasing Neurotrophins And Body Weight Supported Treadmill Training On H-Reflex After Spinal Cord Injury, Jaclyn Ann Witko
Theses and Dissertations
Changes in monosynaptic reflex, often used to study spasticity, has been tested through the H-reflex in spinal cord injury (SCI) patients after rehabilitation training, such as body weight support treadmill training or cycling. The combinational effects of rehabilitation training and a bioengineered scaffold on spasticity in SCI animal model have not been studied. We used a clinically relevant animal model of spinal cord moderate contusion at T9/T10 with BWSTT and the bioengineered scaffold PNIPAAm-g-PEG loaded with the growth factors BDNF/NT-3 to measure the efficiency of the combinational bioengineered approach to treat spasticity. Five animal groups were included in the study: …
Dc Line-Interactive Uninterruptible Power Supply (Ups) With Load Leveling For Constant Power And Pulse Loads, Seyed Ahmad Hamidi
Dc Line-Interactive Uninterruptible Power Supply (Ups) With Load Leveling For Constant Power And Pulse Loads, Seyed Ahmad Hamidi
Theses and Dissertations
Uninterruptable Power Supply (UPS) systems are usually considered as a backup power for electrical systems, providing emergency power when the main power source fails. UPS systems ensure an uninterruptible, reliable and high quality electrical power for systems with critical loads in which a continuous and reliable power supply is a vital requirement.
A novel UPS system topology, DC line-interactive UPS, has been introduced. The new proposed UPS system is based on the DC concept where the power flow in the system has DC characteristic. The new DC UPS system has several advantageous with respect to the on-line 3-phase UPS which …
Monitoring Heart Rate Variability In Relation To Sleep Quality, Yi-Tzu Wang
Monitoring Heart Rate Variability In Relation To Sleep Quality, Yi-Tzu Wang
Theses and Dissertations
The development and analysis of heart rate variability for sleep quality monitoring have been concerned for many years in human being. Sleep is a physiological process that is essentially maintaining the function of human body. Heart rate variability have undergone much-needed development to assess the effects such as sleep disorder, insomnia, high blood pressure, stress and even diabetes. Accurately evaluating physiological signals that are practical to measure the sleep quality in individuals monitoring heart rate variability is an important activation of diverse biological systems during sleep. A noteworthy role of measuring the heart rate variability is played by the autonomic …
Synthesis And Characterization Of 3-D Tissue Engineered Tumor Models For Melanoma Study And Extracellular Matrix Investigation, Joseph L. Spano
Synthesis And Characterization Of 3-D Tissue Engineered Tumor Models For Melanoma Study And Extracellular Matrix Investigation, Joseph L. Spano
Theses and Dissertations
Introduction: Melanoma is the deadliest form of skin cancer, projected to claim over 9,700 American lives and necessitate $3.3 billion in care and treatment costs in 2017. In order to reduce the socioeconomic burdens and lessen cancer-related mortality and morbidity, advancements in early-stage diagnostics and treatments are essential. Two-dimensional (2-D) tissue culture treated plastics (TCTP) are reductionist in vitro models that are commonly used in drug development and preclinical drug evaluation. These models poorly recapture the native tumor microenvironment (TME), providing unrealistic growth conditions, and are thus poorly suited to measure the efficacy of newly emerging therapies. We have developed …
Pegda Pouches To Prevent Adhesions With In Vivo Bioreactor- Based Vascular Graft Strategies, Kranthi Vuppuluri
Pegda Pouches To Prevent Adhesions With In Vivo Bioreactor- Based Vascular Graft Strategies, Kranthi Vuppuluri
Theses and Dissertations
Different strategies have been investigated for the fabrication of vascular grafts. Using the peritoneal cavity of the patient as an “in vivo bioreactor” to recruit autologous cells to the implanted vascular conduit is one of the promising options. One of the main drawbacks with this strategy is the potential to form adhesions in the peritoneal cavity. In this project we are trying to address this potential side-effect by using polyethylene (glycol) diacrylate (PEGDA) to produce a hydrogel pouch into which the electrospun conduits are placed, with the goal of reducing the potential to form peritoneal adhesion after implantation. PEG is …
A Review Of The Potential Therapeutic Application Of Vagus Nerve Stimulation During Childbirth, Tanya Enderli
A Review Of The Potential Therapeutic Application Of Vagus Nerve Stimulation During Childbirth, Tanya Enderli
Theses and Dissertations
The goal of this research is to show that transcutaneous Vagus nerve stimulation (tVNS) should be investigated as a possible modality for increasing endogenous release of oxytocin during childbirth. There have been many great advances made in the practice of modern obstetrics in the last century. The 1900s saw the discovery, isolation, and subsequent widespread use of the hormone oxytocin as an agent to prevent postpartum hemorrhage and to initiate or quicken labor during childbirth. There are significant risks to the fetus when synthetic oxytocin is used. While the medical administration of oxytocin during labor was being popularized, there was …
Mapping Tools For Measuring Gross Motor Function In Conductive Education, Jara’ Nicole Templet
Mapping Tools For Measuring Gross Motor Function In Conductive Education, Jara’ Nicole Templet
Theses and Dissertations
Cerebral Palsy (CP) is a collection of disorders caused by disturbances in the developing brain before, during, or just after birth that affect the development of movement and posture resulting in limitations in activity. Two of the most widely employed gross motor function classification systems used to classify CP are the Gross Motor Function Measure (GMFM) and the Gross Motor Function Classification System (GMFCS). Despite the wide use of these classification systems, neither is fully sufficient in classifying the gross motor function of a patient with CP. A newer therapy program, Conductive Education (CE) seeks to help children with CP …
Automatic Analysis Of Surface Electromyography Of Reflexes For Central Nervous System Inhibition During Pregnancy, Neda Parvin
Automatic Analysis Of Surface Electromyography Of Reflexes For Central Nervous System Inhibition During Pregnancy, Neda Parvin
Theses and Dissertations
Eclampsia is a life-threatening neurological complication (seizures or coma) of pregnancy, and represents progression of pre-eclampsia (high blood pressure and protein in the urine isolated to pregnancy). Even though the exact mechanism of pre-eclampsia and its neurological manifestations have yet to be definitively established, it is known that there is a loss of inhibitory impulses between the cerebral cortex and the spinal cord resulting in exaggerated reflexes. In this work, we establish normative measures for deep tendon reflexes (DTR) during pregnancy. We quantified the surface electromyogram (EMG) at the knee and ankle of DTRs in 279 subjects. The signals were …
Modified Pamam Dendrimers In Tunable Drug-Delivery Systems: A Sustained-Release Dendrimer Hydrogel For Anti-Glaucoma Drugs And Surface-Engineered Macrophages As Nanoparticle Carriers For Targeted Anti-Cancer Therapy, Christopher A. Holden
Theses and Dissertations
Two specific drug-delivery applications were sought in this work using polyamidoamine (PAMAM) dendrimers. One drug-delivery system used a novel dendrimer hydrogel (DH) for sustained delivery of anti-glaucoma drugs. In this work, PAMAM G3.0 dendrimers were covalently bonded with poly(ethylene glycol) (PEG12000) molecules which were subsequently acrylated, resulting in photocurable DH conjugates. For pharmacological studies, DH were loaded with a solution of intraocular pressure lowering drugs, brimonidine and timolol maleate, and were characterized for in vitro release and ex vivo transport and uptake. DH formulations were shown to increase the loading of drug molecules, increase transcorneal drug delivery, and …
Far-Field Optical Microscopy Based On Stimulated Emission Depletion, Yunxia Wang
Far-Field Optical Microscopy Based On Stimulated Emission Depletion, Yunxia Wang
Theses and Dissertations
Conventional lens-based (far-field) fluorescence microscopy is a widely used imaging technique with spatial resolution up to 150–350 nm. However, this technology cannot discern very small structural features, because the spatial resolution is limited by diffraction to about half of the wavelength of light (λ/2,λ is the wavelength of light). Hence, most of the developments in microscopy aim at improving resolution. In the past decades, stimulated emission depletion (STED) microscopy has been developed to bypass the diffraction limit for the application in biological imaging with resolution approaching the nanoscale. The basic principle of STED microscopy is to employ a doughnut-shape laser …
Altering A Runner’S Foot Strike Using A Modified Elliptical Trainer, Daniel Shull
Altering A Runner’S Foot Strike Using A Modified Elliptical Trainer, Daniel Shull
Theses and Dissertations
One possible solution to common running related injuries is to transition runners from a rearfoot strike during initial contact to a midfoot strike. Natural rearfoot strike runners were studied to see if a modified elliptical trainer could be used to alter their running pattern to that of a midfoot strike runner. Their results were compared to subjects who ran on a non-modified elliptical trainer. After training on the modified elliptical trainer, subjects demonstrated a decrease in foot angle at initial contact when attempting to run with a midfoot strike. Training did not affect all kinetic metrics or stride frequency. However, …
Nanomedicine Drug Delivery Across Mucous Membranes, Michael G. Lancina Iii
Nanomedicine Drug Delivery Across Mucous Membranes, Michael G. Lancina Iii
Theses and Dissertations
NANOMEDECINE DRUG DELIVERY ACROSS MUCOUS MEMBRANES
By Michael G. Lancina III
A dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at Virginia Commonwealth University.
Virginia Commonwealth Univeristy, 2017.
Major Director: Dr. Hu Yang, Associate Professor, Chemical and Life Science Engineering
Control over the distribution of therapeutic compounds is a complex and somewhat overlooked field of pharmaceutical research. When swallowing a pill or receiving an injection, it is commonly assumed that drug will spread throughout the body in a more or less uniform concentration and find its way to wherever it is needed. In …
Development And Validation Of A Novel Resonant Energy Transfer (Fret) Biosensor To Measure Tensile Forces At The Linc Complex In Live Cells, Paul Arsenovic
Development And Validation Of A Novel Resonant Energy Transfer (Fret) Biosensor To Measure Tensile Forces At The Linc Complex In Live Cells, Paul Arsenovic
Theses and Dissertations
There is a large body of evidence supporting the theory that cell physiology largely depends on the mechanical properties of its surroundings or micro-environment. More recently studies have shown that changes to intra-cellular mechanical properties can also have a meaningful impact on cell function and in some cases lead to the progression of ailments or disease. For example, small changes to the protein sequence of a structural nuclear envelope protein called lamin-A is known to cause a variety of neurological and musculoskeletal diseases referred to as laminopathies. Currently, there is little incite into how these mutations lead to disease progression …
Electrospraying Extracellular Matrix To Form Nanoparticles, Patrick Link
Electrospraying Extracellular Matrix To Form Nanoparticles, Patrick Link
Theses and Dissertations
Chronic Obstructive Pulmonary Disease (COPD) is a leading cause of death worldwide. Alveolar wall destruction is a significant contributor to COPD. Inflammatory macrophages are a major source of the Extracellular Matrix (ECM) proteolysis. ECM breakdown causes air to get trapped in the alveoli, obstructing airflow. One step in curing COPD may be to convert inflammatory to pro-regenerative macrophages. Recently, decellularized ECM scaffolds have shown the ability to induce a pro-regenerative phenotype.
Yet these scaffolds are incapable for reaching the alveolar region of the lungs. To reach the alveolar region particles need a diameter of 1-5 μm or smaller than 300 …
The Effect Of Vibrotactile Feedback On Remote Manual Task Performance, Matthew S. Standard
The Effect Of Vibrotactile Feedback On Remote Manual Task Performance, Matthew S. Standard
Theses and Dissertations
Vibrotactile feedback offers a unique opportunity to augment or reconstruct impaired tactile sensations, whether that be in the form of enhancing prosthetics or specialized protective clothing. Important information about temperature and object slippage serve to endanger the human operator or equipment. This thesis presents three experiments which investigate amplitude modulated vibrotactile signals as a scalar dimension of roughness, the effect those signals and their locations (finger pad, forearm, bicep) have on the performance of two tasks: the sensing of temperatures simulated by vibrotactile signals and gripping an object of simulated surface texture. The results show task performance increase when the …
Atherosclerotic Plaque Adhesion Strength And Its Role In Plaque Rupture, Bilal Merei
Atherosclerotic Plaque Adhesion Strength And Its Role In Plaque Rupture, Bilal Merei
Theses and Dissertations
Cardiovascular diseases are disorders affecting the blood vessels and the heart. According to the World Health Organization, cardiovascular diseases are one of the leading causes of death worldwide. They are responsible for over 17.1 million deaths per year worldwide, representing 31.5% of deaths 1, 2. Atherosclerosis, a chronic inflammatory disorder affecting large arteries, is the underlying cause of many cardiovascular diseases. Plaque rupture is a serious complication of advanced atherosclerosis, often leading to life-threatening clinical consequences such as myocardial infarction (heart attack) or stroke. 75% of newly developed myocardial infarction cases are caused by atherosclerotic plaque rupture. It affects approximately …
Development Of An Electrospun And 3d Printed Cellular Delivery Device For Dermal Wound Healing, Ryan M. Clohessy
Development Of An Electrospun And 3d Printed Cellular Delivery Device For Dermal Wound Healing, Ryan M. Clohessy
Theses and Dissertations
The goal of this research was to develop a system of individualized medicine that could be applied to dermal wounds serving as a wound dressing and synthetic extracellular matrix while delivering stem cells to the wound bed. First, fabrication parameters for electrospinning polymer fibers were determined. This involved evaluating fiber morphology with respect to polymer selection and solution concentration. Next, construct fabrication was examined to produce an integrated void space, or cargo area, suitable to maintain stem cells. In vitro studies to ensure stem cell viability and phenotype were conducted, and results supported the notion that cells could be administered …
Eye Movement Control: An Index For Athleticism, Brittany L. Oshea
Eye Movement Control: An Index For Athleticism, Brittany L. Oshea
Theses and Dissertations
Athletic potential is one of the most complex human traits. An elite athlete is produced from a complex interaction of an innumerable number of traits exhibited by the athlete. However, it’s not clear whether these traits are innate, allowing the athlete to excel, or, alternatively, are a consequence of practice. To be successful, athletes rely heavily on sensory information from the visual and vestibular systems. This study investigated the relationship eye movement control has with innate athleticism by comparing the saccadic and Vestibulo-Ocular Reflex (VOR) responses of former, no longer practicing, elite athletes against their age and gender matched counterparts …
Investigation Of Polymeric Composites For Controlled Drug Release, Hsi-Wei Yeh
Investigation Of Polymeric Composites For Controlled Drug Release, Hsi-Wei Yeh
Theses and Dissertations
The Electrospray (ES) technique is a promising particle generation method for drug delivery due to its capabilities of producing monodisperse PLGA composite particles with unique configurations and high drug encapsulation efficiency. In the dissertation work, the coaxial dual capillary ES was used to generate drug-loaded core-shell PLGA particles to study the effects of particle filling materials, drug loading locations and particle shell thicknesses on the resultant in vitro release behaviors of the hydrophilic and/ or hydrophobic model drugs. Through release profile characterization of drug-loaded PLGA particles (particle size: 400 nm and 1 μm), it was confirmed that the co-encapsulation of …
Fabrication Of Flexible, Biofunctional Architectures From Silk Proteins, Ramendra K. Pal
Fabrication Of Flexible, Biofunctional Architectures From Silk Proteins, Ramendra K. Pal
Theses and Dissertations
Advances in the biomedical field require functional materials and processes that can lead to devices that are biocompatible, and biodegradable while maintaining high performance and mechanical conformability. In this context, a current shift in focus is towards natural polymers as not only the structural but also functional components of such devices. This poses material-specific functionalization and fabrication related questions in the design and fabrication of such systems. Silk protein biopolymers from the silkworm show tremendous promise in this regard due to intrinsic properties: mechanical performance, optical transparency, biocompatibility, biodegradability, processability, and the ability to entrap and stabilize biomolecules. The unique …
Modulating The Innate Immune Response To Electrospun Scaffolds And Polymer Degradative Byproducts, Daniel Abebayehu
Modulating The Innate Immune Response To Electrospun Scaffolds And Polymer Degradative Byproducts, Daniel Abebayehu
Theses and Dissertations
Implanted biomaterials often induce inflammation that frequently leads to the foreign body response, fibrosis, and the failure of the implant. Thus, it is important to evaluate how cells interact with materials to promote a more regenerative response. It is critical to determine how to modulate the response of tissue resident innate immune cells, as they are among the first cells to interact with implanted materials. Among tissue resident innate immune cells are mast cells, which are inflammatory sentinels that degranulate and orchestrate the fate of other cell populations, such as monocytes/macrophages and lymphocytes. Mast cells have also been reported to …
Advancing Automated Methods For Microrna Profiling, Kia N. Zellars
Advancing Automated Methods For Microrna Profiling, Kia N. Zellars
Theses and Dissertations
The widespread influence of miRNAs in many biological processes and characteristic changes in expression profiles make them potential biomarkers for a range of diseases. With recent discoveries highlighting the enrichment of particular circulating miRNAs in plasma under pathological conditions, there has been a push for technological advances in miRNA profiling studies as a diagnostic tool. A standardized, automated, high-throughput method for miRNA isolation from human plasma samples was developed in this study. Samples were subject to full miRNome profiling utilizing RT-qPCR. These unique findings demonstrate that developing a distinct miRNA biomarker profile for heart failure patients is feasible and holds …